CT26 + Maximum Boost Options

[nemesis]

Does anyone know how much boost (MAXIMUM) a non-modified CT26 turbo can handle???

[Defgeph]

People say it dies out after 15psi.

[creis]

eh, I have heard it craps out at around 10psi, but I dont know for sure, if you want a turbo look into ct20b's, less lag, and can push more boost.

[BBoYRuGGeD]

eh, I have heard it craps out at around 10psi, but I dont know for sure, if you want a turbo look into ct20b's, less lag, and can push more boost.

oh heck no... def. can go more than just 10psi (and believe me it PULLS hard all the way to 14psi... from my own experience of course

yah ive heard people say it can go all the way up to 19psi but 15-16psi is basically the "understood" max for a stock ct26

bboy

This post has been edited by BBoYRuGGeD: Jan 30, 2006 - 12:30 AM

[lagos]

eh, I have heard it craps out at around 10psi, but I dont know for sure, if you want a turbo look into ct20b's, less lag, and can push more boost.

lol... who told you that? 13-15psi is where the turbo comes alive. as far as lag, im pretty sure the ct26 and the ct20 spool just as quickly. the only diffence is that the ct20 makes more power per pound and you can safely run it at aroud 17psi or sometimes a little more.

i never run my ct26 over 15psi.

This post has been edited by lagos: Jan 30, 2006 - 1:13 AM

[jgreening]

People say it dies out after 15psi.

This is a myth. It just becomes more inefficient and more dangerous - especially without good intercooling.

[Defgeph]

Yeah, I'm with you on the myth part. I've run the ct26 @ 18 psi, and the car pulled harder. But maybe that has something to do with my intercooler. I dont feel safe with 18psi on the 26.

For right now, I still think the safe limit for the 26 is @ 15psi.

[tangcla]

Won't die, just runs out of breath.

Daily driver, CT20b is currently doing about 20psi.

click me - Defi boost gauge replay
(1 bar = 14psi)

[Supersprynt]

I'm afraid of going above 15...

[rjbibeau]

this might be kinda funny but i hit 20 once day on accident. i dunno what happened but it blew my motor a few days later haha. i'm guessing i blew a hose prob on the actuator or something... but that was once sweet experience that i will never forget.

[tangcla]

this might be kinda funny but i hit 20 once day on accident. i dunno what happened but it blew my motor a few days later haha. i'm guessing i blew a hose prob on the actuator or something... but that was once sweet experience that i will never forget.

I had one of those too.. quite scary. And since I have a different ECU, no fuelcut... 28psi+ is scary!!!

[Insanity-74]

Anything above 1.2bar and it will lose effeciency and just blow very hot air into your engine, you can run 1.3bar with WI but thats about your limit.

[tangcla]

Anything above 1.2bar and it will lose effeciency and just blow very hot air into your engine, you can run 1.3bar with WI but thats about your limit.

oh hey Nial! Fancy meeting you here

[gt_driFFter]

the only diffence is that the ct20 makes more power per pound and you can safely run it at aroud 17psi or sometimes a little more.

The CT20B has a better powerband. The CT26 just kind of "dies out" around 5200rpm, while the CT20B keeps pulling till redline.

-Josh

[BBoYRuGGeD]

sorta off topic but since we're talking about boost limit i just wunna ask if anyone knows the injectors duty cycle at 10psi? reason i ask is cuz over at the alltrac forums ive read on a recent topic that at 10psi the injectors are at 100% duty cycle which is bad (over a long period of time). can anyone confirm this? i tried looking at mr2oc and didnt really come across what i wanted to know.

even if it was at 100% at 10psi, alot of mr2t/alltrac owners have been boosting as high as 15 without prob over the years so i dont think this should be a prob...but im just curious

bboy

[Defgeph]

sorta off topic but since we're talking about boost limit i just wunna ask if anyone knows the injectors duty cycle at 10psi? reason i ask is cuz over at the alltrac forums ive read on a recent topic that at 10psi the injectors are at 100% duty cycle which is bad (over a long period of time). can anyone confirm this? i tried looking at mr2oc and didnt really come across what i wanted to know.

even if it was at 100% at 10psi, alot of mr2t/alltrac owners have been boosting as high as 15 without prob over the years so i dont think this should be a prob...but im just curious

bboy

You will need to upgrade your fuel rail to safely run over 10psi - 12psi. ATS sells a bored out stock version for 75 bucks. The stock fuel rail starts to restrict the fuel after a certain PSI of boost.

You are correct running over 10 PSI for a long period of time will cause major damage.

[BBoYRuGGeD]

thnx for confirming for me jeff ... anyway i think ill still set my boost at 12 maybe 14 after i make an fcd since i only hit full boost once in awhile when situation calls for it

bboy

[lagos]

You are correct running over 10 PSI for a long period of time will cause major damage.

i dont know if i agree with that. lots of mr2oc guys report running 15psi for a few years with no problems.

most of the stuff i hear says that as long as you stay with the ct26, you shouldnt need any fuel upgrades.

This post has been edited by lagos: Feb 4, 2006 - 1:53 AM

[Defgeph]

Its better to be safe than sorry right ? 75 bucks for an upgraded rail is better than rebuilding and entire engine.

Flowbenchs have proved that the stock fuel rail leans out piston number one.
After a certain amount of turbo pressure.

[BBoYRuGGeD]

Its better to be safe than sorry right ? 75 bucks for an upgraded rail is better than rebuilding and entire engine.

Flowbenchs have proved that the stock fuel rail leans out piston number one.
After a certain amount of turbo pressure.

wow 75 bucks? i gutta check ATS's website out.

do u know at what psi does the stock rail lean number 1 at?

bboy