5sfte rich at idle, 30% out at 1k rmp to keep 14.7 ish a/f Options

[urbandork]

my 5sfte is running rich at idle. I have to take out 30% of fuel with my safc in order to get the 13-14.7 ish a/f ratio.

set up:
255 lph pump
440cc injectors
everything else is stock

What could be causing the problem????

could having the engine retared to much at idle be the cause of the ecu not being able to adjust to a rich mixture?????

This post has been edited by urbandork: May 15, 2006 - 12:15 AM

[penguininatux]

my 5sfte is running rich at idle. I have to take out 30% of fuel with my safc in order to get the 13-14.7 ish a/f ratio.

set up:
255 lph pump
440cc injectors
everything else is stock

What could be causing the problem????

2 bar map sensor. same thing happened to me. except a lil worse. i had to take 50 percent out at idle to get a 12:1 a/f. Im running 460cc RX-7 Injectors ( like pressure2 ). I am not 100% sure this fix. but sure enough that i bought an MSD 2 bar map sensor from summitracing.com and am gonna give it a shot. It'll be here on tuesday or wednesday. i'll let u know how things go.

Dan.

oh and what are u doing about your timing? and how much boost u plan on running?

[presure2]

why are you so worried about being rich at idle?

[urbandork]

why are you so worried about being rich at idle?

it backfires and its kinda embarassing lol

[presure2]

why are you so worried about being rich at idle?

it backfires and its kinda embarassing lol

it backfires @ idle??

[urbandork]

why are you so worried about being rich at idle?

it backfires and its kinda embarassing lol

it backfires @ idle??

no only as i left off the gas. like either when reving it a little or when coming to a stop with the car rolling in nuetral as the engine slows to ilde.

This happens less when i take out the 30% of fuel and more if i dont and keep the car running rich.

[presure2]

why are you so worried about being rich at idle?

it backfires and its kinda embarassing lol

it backfires @ idle??

no only as i left off the gas. like either when reving it a little or when coming to a stop with the car rolling in nuetral as the engine slows to ilde.

This happens less when i take out the 30% of fuel and more if i dont and keep the car running rich.

ahhh thats better, sounds more familiar now...lol yea, i pretty much have the same thing, although i just went for a ride, and pulled a little more fuel betweek 1k-2500rpm, max is 15% @ 1000rpm and basicly eliminated it...do you notice that its almost "controlable"? meaning, that holding the throttle barely open at low speeds then letting off causes it more than any other time?
ive noticed that with mine, and can cause it to burp more or less, depending on my mood that day..lol
IMO its one of those trade off things....we're not running an "optimal" setup, so being a little rich down low is an effect of needing the fuel up top.
thats somthing i think the emanage ultimate will really help me with.

[penguininatux]

This is kinda wierd. Urban. You're fuel injectors are only 4.4% larger than mine. but even at the most negative settings (-50%) i was running like a 11-12:1 a/f during idle and when i barely stepped on it when driving it dropped to about 9.5:1 and started to bog and almost die. So mine's undrivable. Im hoping the 2 bar will help.

btw. do you smoke a lil when you're running that rich?

im using innovate wideband btw.

This post has been edited by penguininatux: May 15, 2006 - 5:19 PM

[presure2]

This is kinda wierd. Urban. You're fuel injectors are only 4.4% larger than mine. but even at the most negative settings (-50%) i was running like a 11-12:1 a/f during idle and when i barely stepped on it when driving it dropped to about 9.5:1 and started to bog and almost die. So mine's undrivable. Im hoping the 2 bar will help.

btw. do you smoke a lil when you're running that rich?

im using innovate wideband btw.

your problem is totally diffrent frlom urbans.
he is using the 2 bar map.
thats what you should be doing as well.

[shin]

my set up's rich too so i have the same problem like you and manny. releases gas and goes pop.. sometimes it gets really loud too.

[urbandork]

my set up's rich too so i have the same problem like you and manny. releases gas and goes pop.. sometimes it gets really loud too.

i guess we all have that lol

[presure2]

yup, pretty much. i must admit, tho, ill take the poping once in a while all day long over running lean like this:

(excuse the nose in the pic!! )

[penguininatux]

ahh.. i still dont understand why u can run the 460's and not go too rich?! If i was at like -10% to idle with my 460cc's i'd be at like 5:1 A/F lol.

do u think u could do me a favor?

take out your map sensor, or put the stock on in for a sec. just a quick unplug and plug in. and see if you run extremely rich? because then thatd mean i did the 2 bar wiring wrong. but still. for some reason i just dont see my fuel problems being fixed all of a sudden over a map sensor.. but let me know waht u think

Dan

[lagos]

wow, you were "blow up the motor" type of lean there ! that was on those old greentops, right?

[CheesyLobster]

all i know is that i have a smaller motor, 550cc injectors, -50 correction (low trtl), checkvalves+fmu, and i ran perfectly according to my narrowband...

[presure2]

with the stock map, it basicly wont run
yea art, thats the 315s, untuned.

[jgreening]

with the stock map, it basicly wont run
yea art, thats the 315s, untuned.

Quick story: When I dynoed my car, some of you may remember that it slid off the dyno and ruined the front right tire. The shop agreed to replace my tire and not charge me for the dyno session. I gave them the rim, put the donut on and picked up the tire and rim a couple days later. When I went to pick it up, they had just put a C5 vette with a newly installed procharger on the rollers so I decided to stick around and watch what kind of number it would make. The tuner told me that the owner was coming over to be there for the tuning session. He said, well I will just start without him (At the time, I thought, I wouldn't like it if the guy started tuning on my car if I said I wanted to be there when it was tuned but continued to observe). On the first pull, the guy took the engine all the way to redline without watching the a/f and the car put down about 550 whp. Then, the guy got out of the car and started pushing buttons on the computer and he said "oh, that went lean". I asked what the a/f got up to and he said 22! The owner shows up and the tuner says to him: We did a test pull and the car is a little lean so we will need to add some fuel before we go further. He never mentions the figure or how close he came to popping the engine. It was right then that I decided that I would never take my car back there. Moral of the story: be present during tuning and always monitor your a/f ratios and be prepared to cut the run if necessary.

This post has been edited by jgreening: May 18, 2006 - 9:58 PM

[penguininatux]

but anyways. do u think i should go with the 3sgte map sensor or new injectors. i know for a fact that the new injectors will help me run leaner. My experience with a 2 bar map sensor has given me doubts on it effectiveness of leaning a/f's. u wanna let me borrow yours manny? lol. j/k. but i really wanna see what happens if i put a 3sgte map on before i buy one for a $50-100 because i just bought a brand new msd 2 bar lol and it yeilded no effect. But again i dont even know if its wired in correctly?!

Anyways.. what do u guys think i should do?

anyone live in washington that has a 3sgte map sensor? someone that would let me plug their map sensor in for a sec? lol.. but kinda seirously. i'll drive somewhere.

Thanks.

DAn

This post has been edited by penguininatux: May 18, 2006 - 11:21 PM

[jgreening]

but anyways. do u think i should go with the 3sgte map sensor or new injectors. i know for a fact that the new injectors will help me run leaner. My experience with a 2 bar map sensor has given me doubts on it effectiveness of leaning a/f's. u wanna let me borrow yours manny? lol. j/k. but i really wanna see what happens if i put a 3sgte map on before i buy one for a $50-100 because i just bought a brand new msd 2 bar lol and it yeilded no effect. But again i dont even know if its wired in correctly?!

Anyways.. what do u guys think i should do?

anyone live in washington that has a 3sgte map sensor? someone that would let me plug their map sensor in for a sec? lol.. but kinda seirously. i'll drive somewhere.

Thanks.

DAn

You should not "tune" by changing injector sizes. If you are running rich, you need to lean out the a/f ratio some other way, i.e. ems or piggy back.

[presure2]

this is the last time i will post this.
GET THAT MAP SENSOR IN THERE PROPERLY!