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6G Celicas Forums > 6th Generation Celica > Engine/Transmission/Maintenance
SlowCelica94
Ok, the ct-26 is cheap and decent. It's worthless after 8psi tho. The T3 is hear works well. But if you use that, you use lower boost levels righT? And T3/t4 would be overkill cuz u could probably get a t3 cheaper, right? Someone clue me in on what u think the ideal turby for 5s is and why.

With a T-series, would u need a new manifold or just flange?
Punch
on a CT26 you can run up-to 15psi (been done)
you can up-grade your CT26 to a T04 & run 20-30+psi if your motor car hold that much boost...
creis
my money is on the ct26, because the manifold, downpipe, and other parts are all easy to get (for the most part) and at low cost. Not to mention its a perfect fit for that motor. The 5s is not really ment for much more than 8 psi, (although it can hold more.)

Its what i'm getting.
Punch
got my ct26 for $75
took it to get rebuilted , there was no need it was fine
orvillescelica
im sure youve read the stickies by 1bwilson and shid. It really all depends on what your power goals are. If you are not looking for anything more than 200 or so on a daily basis, then definatly the ct26 is perfect. I say daily basis as you can still crank up the boost, but i wouldnt have it that high on the ct26 everyday. But if your goals are higher than that, than i would go with the T3.
1bwilson
All you need to run a t3 with a 3sgte manifold is a flange also.
shid
The cost difference between a t3/t4 and a t3 really isn't that much. As for upgrading the CT26 to run 20-30 PSI... uhh.. no..

Basically, all you should be considering are your power goals, and the amount of $ you have to spend.

If you want to boost cheaply and get decent boost; there's really nothing wrong with low boosting on the CT26- I was a little too hard on it in my sticky.

If you want to set up a perfect boost machine that gives you LOTS of room to play with down the line- t3/t4.
x_itchy_b_x
ok so blowing up my motor aside, running 13 psi on the ct-26 is a bad idea?
Uppitycracker
QUOTE (x_itchy_b_x @ Oct 17, 2004 - 10:50 AM)
ok so blowing up my motor aside, running 13 psi on the ct-26 is a bad idea?

well unless you installed low comp pistons
shid
QUOTE (x_itchy_b_x @ Oct 17, 2004 - 5:50 PM)
ok so blowing up my motor aside, running 13 psi on the ct-26 is a bad idea?

No, if you already know and plan for the risks, 13 psi on a ct26 is fine- it's just not economical because it's out of the turbos efficiency range- every increase of psi you get less hp- of course you still GAIN HP biggrin.gif,

The problem is, once you're out of the efficiency range the turbo has to work much harder to get you those gains (this leads to much increased turbo wear). At one point the turbo will refuse to spin any faster (I don't remember this point on the ct26) due to a variety of mechanical reasons (inlet outlet size, spool, etc etc etc) and if you up the psi past that, you'll damage the turbo. You won't hit that point at 13 psi tho smile.gif

Basically, what it comes down to is that even if you up the psi to some insane amount on the ct26 (say, 20-30) you'll probably be at the hp level of 15 psi on a bigger turbo (but your engine still has to handle 30 psi!!) Not to mention that even with a smaller turbo; it still takes a long time to build up to 30 psi. A larger turbo would spool up to the 15 psi mark faster.

After you've built up your engine to handle 20 psi- would you rather run 20 psi on a smaller turbo, or a larger turbo?
jgreening
QUOTE
ok so blowing up my motor aside, running 13 psi on the ct-26 is a bad idea?


confused.gif I don't understand your question. People suggest to not boost too high on a 5sfte because of engine longevity/safety issues. When you say "(setting aside) blowing up my motor, ...." what other considerations are there?
shid
QUOTE (jgreening @ Oct 17, 2004 - 6:18 PM)
QUOTE
ok so blowing up my motor aside, running 13 psi on the ct-26 is a bad idea?


confused.gif I don't understand your question. People suggest to not boost too high on a 5sfte because of engine longevity/safety issues. When you say "(setting aside) blowing up my motor, ...." what other considerations are there?

turbo wear and tear- does it even make sense, etc
jgreening
QUOTE
if you already know and plan for the risks, 13 psi on a ct26 is fine- it's just not economical because it's out of the turbos efficiency range-every increase of psi you get less hp- of course you still GAIN HP


I think this is somewhat misleading. Although you probably didn't intend it, your post implies that the gains between 10psi and 13psi on a ct-26 are somehow not worth it because of turbo efficiency issues. I can attest to the fact that this is definitely not true. The differences in "power feel" between 10psi and 13psi on a ct-26 (albeit in a 3s rather than 5sfte) are dramatic.
turboinduction
He means that the turbo efficiency between 10 and 13 are still GREAT in power, but that the turbo itself will have a hard time doing it and possibly break if continued on a daily basis. I'd say anything over 8psi goto a T3/T4.

-Ti
jgreening
QUOTE
He means that the turbo efficiency between 10 and 13 are still GREAT in power, but that the turbo itself will have a hard time doing it and possibly break if continued on a daily basis.


I disagree with this. There are legions of people running 14-15psi daily on the ct-26 with no dramatic increase in wear. Will it increase wear and shorten its life? Yes, but you are not going to all of sudden cook the turbo due to this type of use. I am also of the opinion that running it properly (proper start-up and cool down times) will do more for to insure long turbo life than anything else.
shid
QUOTE (jgreening @ Oct 17, 2004 - 6:36 PM)
I am also of the opinion that running it properly (proper start-up and cool down times) will do more for to insure long turbo life than anything else.

Your right, that is the best for increasing turbo life.

Jay, I think you missed Turbo and I's point- you WILL get power gains, they WILL feel great; there's no power reason to not take your CT26 up to 15 psi; you'll still get power out of it.

But when you're BUYING a turbo for your 5sfe (2pointTWO l engine) the T3/t4 makes much more sense over 10 psi- after that you're putting the same wear and tear on your engine as the psi goes up- but you're getting much less out of it.

A t3/t4 running at 15 psi and a CT26 running at 15 psi; the T3/t4 WILL have more horsies.


Also, one more thing I forgot to mention is that if you're ever even contemplating a swap- even a year down the line or more; the CT26 is just a waste of money; while doing a T3/t4 setup now will allow you to move your entire upgraded turbo setup over to the 3sgte (with the exception of the piping into the throttle body)
jgreening
QUOTE
they WILL feel great; there's no power reason to not take your CT26 up to 15 psi


This is what was missing from the previous posts. With that said, I agree.

As for what turbo makes the most sense, I think its a power goal vs. price issue. It makes the most sense to buy the ct-26 for the guy that wants to get 150whp out of his car and has $1000 to spend.
shid
QUOTE (jgreening @ Oct 17, 2004 - 7:19 PM)
As for what turbo makes the most sense, I think its a power goal vs. price issue. It makes the most sense to buy the ct-26 for the guy that wants to get 150whp out of his car and has $1000 to spend.

Agreed
SlowCelica94
Thanks guys, that's some solid info
Doge
13psi is not out of the turbo's efficiency range.. in fact 13 psi is right at the ct26's PEAK efficiency... just about every MR2 member on mr2oc.com that has a boost controller runs 15psi DAILY... because it is reliable... and proven to be. 17psi isn't even out of the question... but at this point you ARE dealing with efficiency issues (when a turbo can't spin any faster it is called choking). Point is the ct26 is more than the stock 5s can handle for sure... and it has a little faster spool up time than the t3... because it is meant for a 2.0L low end torque MONSTER! biggrin.gif
shid
QUOTE (Doge @ Oct 18, 2004 - 9:12 AM)
Point is the ct26 is more than the stock 5s can handle for sure... and it has a little faster spool up time than the t3... because it is meant for a 2.0L low end torque MONSTER! biggrin.gif

Which is why it's too small for a 2.2L; you have increased air volume going through the turbo- THATs why 13 psi is out of the efficiency range for a ct26 on a 2.TWOL engine
Doge
Shid read up on turbo performance alittle more... I think you are forgetting some things. First of all... 13psi is 13psi. A 2.2L engine is going to be able to reach 13psi QUICKER than a 2.0L. It doesn't matter how big of an engine you have... it doesnt govern the turbo's performance abilities... the design of the turbo is what determines its efficiency range. The ct26 is the first turbo on the sequential twin turbo setup in a supra... which is a 3.0L It is able to spool the ct26 WAY faster because of the increased volume of air... it still begins to choke around 17psi... and 13psi is still its most efficient zone.
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