Fuel cut???, Does a 3SGTE need this? Options

[str8thugginit4ya]

Hello fellow 6GC'ers,

I tried searching for the answer to this, but I guess I either am the first person to ask this or I just suck at research. I have a 94 GT with a 3rd gen 3SGTE swap in it. I currently have my boost turned down to about 8lbs. Before I get into the problems I have, I just wanted to know if the 3S needs a fuel cut or not? Also, if it does, is it the 4 wire or 5 wire one? Please let me know as soon as you can. Ok, the reason why I have my boost turned down is because when I have the boost set to stock (14lbs), I get a sputtering, as if the car is struggling to pull whenever the boost hits a little less than 1 bar or higher. Please let me know if this could be because of not having a fuel cut installed or if it could be something else. I already put in new cap, rotor, plugs, wires because I thought it was my ignition system. Any input will be greatly appreciated. Oh, and I also have a AFC Neo hooked up to the car as well if that changes anything.


-Thanks, Ryan

[Neon90424]

When you hit fuel cut, You will know that you hit it...it feels like ****...like your engine hits a speedbump lol, if you are running stock ecu on a 3rd gen fuel cut is built in at 17 psi and the way to fool it is with a FCD on the boost signal which i cant recall which it was

[Ted95]

if its strugglin for power then there might be a boost leak, are you using the factory top mount IC or a front mount?

[str8thugginit4ya]

if its strugglin for power then there might be a boost leak, are you using the factory top mount IC or a front mount?

Oh, ok. So I won't need a fuel cut right now, cause I'm only running 14lbs when the sputtering starts Neon90424. I'm using a sperco front mount intercooler. The piping was used before, so you may be right on the boost leak. I was already in the process of upgrading the charge piping anyways. But would that cause it to struggle for power only when it reaches about .75 bar. Before, I noticed it would struggle only around 5k, then I saw when it builds to about .75 bar is when it is struggling as well. So I don't exactly know if it's struggling when it hits .75 bar, or when it hits 5k. I'm daily driving it on .5 bar & if I punch it on .5 bar there's no problems.



-Ryan

[Ted95]

if its strugglin for power then there might be a boost leak, are you using the factory top mount IC or a front mount?

Oh, ok. So I won't need a fuel cut right now, cause I'm only running 14lbs when the sputtering starts Neon90424. I'm using a sperco front mount intercooler. The piping was used before, so you may be right on the boost leak. I was already in the process of upgrading the charge piping anyways. But would that cause it to struggle for power only when it reaches about .75 bar. Before, I noticed it would struggle only around 5k, then I saw when it builds to about .75 bar is when it is struggling as well. So I don't exactly know if it's struggling when it hits .75 bar, or when it hits 5k. I'm daily driving it on .5 bar & if I punch it on .5 bar there's no problems.



-Ryan

Fuel cut is somethin that just happens, its not something you try to get, its a saftey thing for the motor. did you eliminate your stock boost controller? because you will hit fuel cut if the stock boost controller is still connected there for your aftermarket boost controller wont work.

when i first got my swap up and running i hit fuel cut at about 4k at 80mph, and you will kno when it hits fuel but because it falls flat on hits face out of no where, its like boooooooossttttt then pow! you got hit in the face with a shovel.. lol after that happened i eliminated my stock boost controller and then no more fuel cut. so if your not having those issues then you might have a boost leak, recheck all your clamps and couplers to make sure they are tight and not loose, if your using aluminum piping dont over tighten them bc they will bend.

[str8thugginit4ya]

if its strugglin for power then there might be a boost leak, are you using the factory top mount IC or a front mount?

Oh, ok. So I won't need a fuel cut right now, cause I'm only running 14lbs when the sputtering starts Neon90424. I'm using a sperco front mount intercooler. The piping was used before, so you may be right on the boost leak. I was already in the process of upgrading the charge piping anyways. But would that cause it to struggle for power only when it reaches about .75 bar. Before, I noticed it would struggle only around 5k, then I saw when it builds to about .75 bar is when it is struggling as well. So I don't exactly know if it's struggling when it hits .75 bar, or when it hits 5k. I'm daily driving it on .5 bar & if I punch it on .5 bar there's no problems.



-Ryan

Fuel cut is somethin that just happens, its not something you try to get, its a saftey thing for the motor. did you eliminate your stock boost controller? because you will hit fuel cut if the stock boost controller is still connected there for your aftermarket boost controller wont work.

when i first got my swap up and running i hit fuel cut at about 4k at 80mph, and you will kno when it hits fuel but because it falls flat on hits face out of no where, its like boooooooossttttt then pow! you got hit in the face with a shovel.. lol after that happened i eliminated my stock boost controller and then no more fuel cut. so if your not having those issues then you might have a boost leak, recheck all your clamps and couplers to make sure they are tight and not loose, if your using aluminum piping dont over tighten them bc they will bend.

What I meant to say was Fuel Cut Defenser. Sorry about that. But much thanks for all the info. I don't think I'm hitting fuel cut cause when I say it's losing power, I mean that the engine's still going but it's like it loses about 60-70 horsepower when the struggling starts. So it's like "wow, this car is fast!" until it starts losing power, then it's like "hmm, what's wrong this engine?" But remember, it only does this when I have it on 14lbs, so I'm pretty sure it might be a boost leak now, though. Or else I'm hoping it's something to that extent of easiness to fix. My friend keeps telling me to just wait a couple more months & upgrade the turbo & the piping at the same time, but I'm not too sure if I want all that speed. Sure it would be great to have, but if I were going that route I would definitely would want to have a daily driver even though I know the engine could handle it. I just like to baby my cars. Oh, and yes I do believe the factory boost controller is removed.

[Rav4Race]

Or it might also be a problem with the fuelling. if at 8lbs boost your engine doesn't struggle n it does for 14lbs of boost...u might not be getting enough fuel pressure. Because if you have enough boost, means that your getting enough air, so air is not the problem. It might then be either the ignition or the fuel or both. As u mentioned, its not ur ignition as u just changed everything to new. Might worth checking your fuel pump (could be too weak for your new engine), your fuel pressure regulator + make sure your fuel filter flows adequately. Or u simply need to clean your injectors? If the problem still persists...make sure your ECU or MAP are ok. Hope i helped.

[str8thugginit4ya]

Or it might also be a problem with the fuelling. if at 8lbs boost your engine doesn't struggle n it does for 14lbs of boost...u might not be getting enough fuel pressure. Because if you have enough boost, means that your getting enough air, so air is not the problem. It might then be either the ignition or the fuel or both. As u mentioned, its not ur ignition as u just changed everything to new. Might worth checking your fuel pump (could be too weak for your new engine), your fuel pressure regulator + make sure your fuel filter flows adequately. Or u simply need to clean your injectors? If the problem still persists...make sure your ECU or MAP are ok. Hope i helped.

Thanks a lot. I've been so busy thinking that it might be a boosting problem that I didn't think to check fuel. Don't know if it's the problem for sure, but will check it as soon as I get a chance.


-Thanks again, Ryan

[Rav4Race]

ur welcome...i hope we spotted the right problem. let us know if u sort it out:)

[str8thugginit4ya]

ur welcome...i hope we spotted the right problem. let us know if u sort it out:)

I know I took super long with this, but i think I've found the problem. I went to change the fuel filter yesterday and it looked to be CLOGGED! It wasn't even an original filter, looked like the previous owner had changed the filter with a Purolator one. Unfortunately I couldn't finish the fuel filter replacement cause I got the wrong Toyota filter. I don't know how, but when I called the dealership to get the right one, they said they had to order it cause they didn't have it in stock. So I won't be able to finish replacing the filter until after the weekend. Will update you guys on if the fuel filter was the problem.


-Thanks, Ryan

[injection]

This is all very interesting, turns out i have a 94 GT that has a 3rd gen 3sgte as well, that i installed and had up n running this last may, the thing SNORTS!! for some reason though, since the first drive, the boost is at 18lbs.....was i supposed to adjust something to turn it down?? if so where is the stock boost controller to turn it down. I was under the impression that if these things overboost, there is the wastegate at the downpipe that opens to let excess boost by, so as to not have to much boost... i have hit fuel cut twice, at around 20psi.....no pinging or anything, and its bloody scary being front wheel drive n all,
I am getting off topic, I to am expieriencing strange hesitation as soon as i get above 4500rpm, its always been there since start-up, i can still take 09 subaru WRX's no problem, and actually pull away from them....But it feels like theres more there that is not getting uncorked,
from reading what you guys are talking about, i remember i do have a new fuel filter, but its for the GT model (5sfe), my cap,rotor,plugs and wires are all new, and i have the walbro 255 pump, i wonder if the filter could be my problem because it is originally for the 5s, is there a difference??? does the fuel filter for the 3rd 3sgte have more flow??
as well, just recently started having sputtering at high rpms, you can hear it out of the exhaust....any info would be awesome! thanks

[injection]

well, i just went out to my car to check some things related, and noticed right by the snorkel for the timing belt, there is a small hose that goes from my intake manifold to a little circular piece, just beneath the oil cap and a little behind it if you were looking straight over it and down, this little 6-7 inch hose was disconnected from the circular piece......hope this eliminates my recent sputtering instances, still lookin for a way to eliminate the hesitations at higher rpm's......any ideas?

[str8thugginit4ya]

This is all very interesting, turns out i have a 94 GT that has a 3rd gen 3sgte as well, that i installed and had up n running this last may, the thing SNORTS!! for some reason though, since the first drive, the boost is at 18lbs.....was i supposed to adjust something to turn it down?? if so where is the stock boost controller to turn it down. I was under the impression that if these things overboost, there is the wastegate at the downpipe that opens to let excess boost by, so as to not have to much boost... i have hit fuel cut twice, at around 20psi.....no pinging or anything, and its bloody scary being front wheel drive n all,
I am getting off topic, I to am expieriencing strange hesitation as soon as i get above 4500rpm, its always been there since start-up, i can still take 09 subaru WRX's no problem, and actually pull away from them....But it feels like theres more there that is not getting uncorked,
from reading what you guys are talking about, i remember i do have a new fuel filter, but its for the GT model (5sfe), my cap,rotor,plugs and wires are all new, and i have the walbro 255 pump, i wonder if the filter could be my problem because it is originally for the 5s, is there a difference??? does the fuel filter for the 3rd 3sgte have more flow??
as well, just recently started having sputtering at high rpms, you can hear it out of the exhaust....any info would be awesome! thanks

This is something totally different than my problem. But I think I know the solution to your problem. One of your vacuum lines (I think the one running to your actuator) is not hooked up and/or leaking. This is what controls how much boost you run. If there's no line hooked up to your actuator, then this means your actuator is opening fully which is very bad. Make sure your lines are good. I'm pretty sure this is your problem, if not, you might have a more complex problem on your hands. Which, hopefully, one of the more knowledgeable 6GC members could help you with.


-Ryan

[injection]

This is all very interesting, turns out i have a 94 GT that has a 3rd gen 3sgte as well, that i installed and had up n running this last may, the thing SNORTS!! for some reason though, since the first drive, the boost is at 18lbs.....was i supposed to adjust something to turn it down?? if so where is the stock boost controller to turn it down. I was under the impression that if these things overboost, there is the wastegate at the downpipe that opens to let excess boost by, so as to not have to much boost... i have hit fuel cut twice, at around 20psi.....no pinging or anything, and its bloody scary being front wheel drive n all,
I am getting off topic, I to am expieriencing strange hesitation as soon as i get above 4500rpm, its always been there since start-up, i can still take 09 subaru WRX's no problem, and actually pull away from them....But it feels like theres more there that is not getting uncorked,
from reading what you guys are talking about, i remember i do have a new fuel filter, but its for the GT model (5sfe), my cap,rotor,plugs and wires are all new, and i have the walbro 255 pump, i wonder if the filter could be my problem because it is originally for the 5s, is there a difference??? does the fuel filter for the 3rd 3sgte have more flow??
as well, just recently started having sputtering at high rpms, you can hear it out of the exhaust....any info would be awesome! thanks

This is something totally different than my problem. But I think I know the solution to your problem. One of your vacuum lines (I think the one running to your actuator) is not hooked up and/or leaking. This is what controls how much boost you run. If there's no line hooked up to your actuator, then this means your actuator is opening fully which is very bad. Make sure your lines are good. I'm pretty sure this is your problem, if not, you might have a more complex problem on your hands. Which, hopefully, one of the more knowledgeable 6GC members could help you with.

Yeah, already looked into that, took off the downpipe saw my actuator, took off the supply line, and hooked my compressor air line up to the supply line and pushed 20lbs of air through it.....actuator worked fine, tried all different types of air pressures not exceeding 25lbs, and it worked great, its another issue????????? but thanks


-Ryan

[str8thugginit4ya]

This is all very interesting, turns out i have a 94 GT that has a 3rd gen 3sgte as well, that i installed and had up n running this last may, the thing SNORTS!! for some reason though, since the first drive, the boost is at 18lbs.....was i supposed to adjust something to turn it down?? if so where is the stock boost controller to turn it down. I was under the impression that if these things overboost, there is the wastegate at the downpipe that opens to let excess boost by, so as to not have to much boost... i have hit fuel cut twice, at around 20psi.....no pinging or anything, and its bloody scary being front wheel drive n all,
I am getting off topic, I to am expieriencing strange hesitation as soon as i get above 4500rpm, its always been there since start-up, i can still take 09 subaru WRX's no problem, and actually pull away from them....But it feels like theres more there that is not getting uncorked,
from reading what you guys are talking about, i remember i do have a new fuel filter, but its for the GT model (5sfe), my cap,rotor,plugs and wires are all new, and i have the walbro 255 pump, i wonder if the filter could be my problem because it is originally for the 5s, is there a difference??? does the fuel filter for the 3rd 3sgte have more flow??
as well, just recently started having sputtering at high rpms, you can hear it out of the exhaust....any info would be awesome! thanks

This is something totally different than my problem. But I think I know the solution to your problem. One of your vacuum lines (I think the one running to your actuator) is not hooked up and/or leaking. This is what controls how much boost you run. If there's no line hooked up to your actuator, then this means your actuator is opening fully which is very bad. Make sure your lines are good. I'm pretty sure this is your problem, if not, you might have a more complex problem on your hands. Which, hopefully, one of the more knowledgeable 6GC members could help you with.

Yeah, already looked into that, took off the downpipe saw my actuator, took off the supply line, and hooked my compressor air line up to the supply line and pushed 20lbs of air through it.....actuator worked fine, tried all different types of air pressures not exceeding 25lbs, and it worked great, its another issue????????? but thanks


-Ryan

Are you sure all of your vacuum lines are run to the correct places. I'm not 100% sure which lines run to where, but I know that if you get them mixed up as well, you could have the same problem with the actuator opening up fully. If not, then sorry I couldn't help. Hope you fix the problem soon, though.


-Ryan

[Rav4Race]

yes injection...it could b a fuel problem. I understand that u have 2 problems right? 1-u r overboosting...2-ur getting strange hesitations at around 4500 rpm?
Normally when u overboost u meet fuel cuts. But if someone runs more boost than stock boost he might lack fuel pressure, which means the engine might run lean which can be disastrous for an engine. the more boost you input, the more fuel u will need. Running richer is always safer for an engine! make sure you r getting enough fuel pressure or reduce your boost pressure. How to reduce your boost? the best way is to get a boost controller. I personally use the Apexi AVC-R, which i think is very good as i can control my boost on all the gears. Double check that all your hoses are properly connected. make sure you are not bypassing the waster gate. There r two other hoses under the car, make sure they are well connected and not bypassed.


Ryan...get the right fuel filter:)

[str8thugginit4ya]

yes injection...it could b a fuel problem. I understand that u have 2 problems right? 1-u r overboosting...2-ur getting strange hesitations at around 4500 rpm?
Normally when u overboost u meet fuel cuts. But if someone runs more boost than stock boost he might lack fuel pressure, which means the engine might run lean which can be disastrous for an engine. the more boost you input, the more fuel u will need. Running richer is always safer for an engine! make sure you r getting enough fuel pressure or reduce your boost pressure. How to reduce your boost? the best way is to get a boost controller. I personally use the Apexi AVC-R, which i think is very good as i can control my boost on all the gears. Double check that all your hoses are properly connected. make sure you are not bypassing the waster gate. There r two other hoses under the car, make sure they are well connected and not bypassed.


Ryan...get the right fuel filter:)

Lol, I'm working on it. They said it should be in first thing tomorrow. Then it's off to replacing it.


-Thanks, Ryan

[injection]

Thanx guys
I dont know whats going on, all hoses look good and well secured...including the 2 that go behind the motor, that r accessed under the chassie. Think ur right, if I buy a boost controller, would that let me adjust the pressure no matter what? just curious, cause ever since i got this thing going, boost is on the high side ( 18psi ), and i have tried everything to bring it down.....but, i havnt purchased a b. controller yet. r they fairly simple 2 install???

[injection]

oh yeah! i am also running a brand new fuel filter that was factory for the previous engine that was in the car, which was the notorious 2.2 5sfe 135hp motor,
I am still running the same fuel filter on the new and very much improved 3gen 3sgte motor......is this ok???? or am i starving it, i am running the walbro 255 pump, so i know i have good flow from the pump.....what are the odds of the fuel regulator acting up??? i know these are a lot of rabbit trails, please do your best in answering, thanx

[str8thugginit4ya]

oh yeah! i am also running a brand new fuel filter that was factory for the previous engine that was in the car, which was the notorious 2.2 5sfe 135hp motor,
I am still running the same fuel filter on the new and very much improved 3gen 3sgte motor......is this ok???? or am i starving it, i am running the walbro 255 pump, so i know i have good flow from the pump.....what are the odds of the fuel regulator acting up??? i know these are a lot of rabbit trails, please do your best in answering, thanx

i believe the fuel filter should be just fine. Maybe your actuator could be bad. Maybe it opened up & got stuck there. Just a thought.


-Ryan

[str8thugginit4ya]

MY PROBLEM IS FIXED!!! My Celi is PULLING like a BEAST! It's running a little bit rich as of now, though. I have an Apexi AFC NEO, but I need to get a wideband to tune it properly. Thank you to all those who gave their input, especially Rav4Race. Next project is GT4 brake setup to hold back all this power. Almost had a nasty incident which was avoided, all thanks to GOD!


-Thanks again guys, Ryan

[Rav4Race]

MY PROBLEM IS FIXED!!! My Celi is PULLING like a BEAST! It's running a little bit rich as of now, though. I have an Apexi AFC NEO, but I need to get a wideband to tune it properly. Thank you to all those who gave their input, especially Rav4Race. Next project is GT4 brake setup to hold back all this power. Almost had a nasty incident which was avoided, all thanks to GOD!


-Thanks again guys, Ryan

your Welcome bro. always a pleasure to help:)

And you said it right...we thnk god:)

[injection]

Eh Rav, ordered a PowerTek boost controller, its coming from the UK, should take just over a week to get here, it says it comes with detailed instructions, but i will probably be hittin you up for info.
apparently from what i saw you install the T valve on the little vacuum line that goes from the turbo to the wastegate...right? turbo side goes into one side of T and wastegate on the other, then there is the set screw for adjustment on turbo pressure, correct? cant wait, think i will set it for 14-15psi, think thats a little higher then stock, but fuel should be able to keep up with that....instead of 18psi!!! price was $67. shipped, figured that was pretty good, its a kit

[Rav4Race]

well bro i cant tell u exactly how to install it as im using the Apexi AVC-R. But if ur getting the instructions with it then it should be an easy installation. However try searching on the net how to use and calibrate it as thats normally the most difficult part. With stock internals i wouldnt advise to go higher than 1.1 bar, even some people may say that 1.2 bar is safe. In fact it depends on a lot of things. For e.g; your fuel octane rating...fresh air intake...if your heat transfer system is working correctly, especially if you had a swap. If your fuel system if clean you shouldn't have any problem.
Ive learnt lots of things since i had my swap. For example, i am now convinced that getting a super powerful fuel pump will not improve your hp by much more than your stock fuel pump. U may get 1 hp? or 2? thats all. But always make sure you r getting enough fresh air and boost....fuel and a good ignition for real power.

[injection]

well bro i cant tell u exactly how to install it as im using the Apexi AVC-R. But if ur getting the instructions with it then it should be an easy installation. However try searching on the net how to use and calibrate it as thats normally the most difficult part. With stock internals i wouldnt advise to go higher than 1.1 bar, even some people may say that 1.2 bar is safe. In fact it depends on a lot of things. For e.g; your fuel octane rating...fresh air intake...if your heat transfer system is working correctly, especially if you had a swap. If your fuel system if clean you shouldn't have any problem.
Ive learnt lots of things since i had my swap. For example, i am now convinced that getting a super powerful fuel pump will not improve your hp by much more than your stock fuel pump. U may get 1 hp? or 2? thats all. But always make sure you r getting enough fresh air and boost....fuel and a good ignition for real power.

Thanx Rav, will be lookin at aftermarket wires, n new plugs over the winter dizzy n rotor all brand new....put 4500kms on since swap, figured do plugs n new set of wires n plugs over winter, cool