[SupraTuner7M]

I just got a brand new rebuilt ct26. I am planning uping the boost to 10 or 12 psi. I'm not sure on if that much boost is safe and reliable for an everyday driver. I have also heard of there being fuel cut off but not sure when.

 

[90Legend]

You should be fine at those levels.
Make sure everything else is right with the engine before turning up the boost.

Dan

 

[Slow_Sc3]

10-12 psi is fine, you shouldnt have a problem with the turbo.

 

[SupraTuner7M]

okay now that I know I'm safe on the turbo side, but what about the whole fuel cut issue. Anyone know if running 12psi safe without the fuel cut?

 

[skeeter019]

i think fuel cut is around the 12-13 psi range. so u will be close but dont think u will hit it

 

[90Legend]

Fuel cut varies a bit on each car.

You'll know when you hit it, from what I've heard.

Fuel cut is a friend of you and your engine.

 

[FinalRights]

Your car makes a really nice jolt movement,and your check engine lights come on.

 

[89 Black Beauty]

lol yeah first time i hit fuel cut and still now sometimes if i turn it up too high it still scarees me and i think i broke something.... it's all good though, i recommend not to push the car near fuel cut, i run 10 psi max

 

[toyota_supra_1988]

if you want to be on the safe side id say 10psi. but it does vary, so try out 12psi, if you hit fuel cut, knock the boost down a little.

 

[89 Black Beauty]

keep in mind that if you're not using an electronic boost controller then different times of day and temperatures and moisure will affect it. I'm definately looking at a electronic boost controller because that you you can set it to a certain level and it will spool that high all the way in every gear, i notice that my turbo spools at about 7psi in 1 and 2 and in 4 and 5 it's at 10 or 11psi.

 

[cnewingham]

I hit fuel cut around 10-11psi. I dont even have my EVC turned on and I still can hit 10psi with full exhaust,intake, spearco & hp's and a few other BPU crap. And I am also on a stock ct.

 

[Disced]

You have to understand that the engine is not putting out enough exhaust velocity in first gear because there is not a big enough load on the engine; hence the turbo doesn't spool up fully. If you hit 10-11 psi in first gear; i'm sure you would lose complete control.

I have been using an MBC and even though I have a bit more room to play with; I boost anywhere from 14 psi on a warm day to 17-18 psi @ night..

You should set an MBC to 10... since most people's fuel cut is @ 12...

Good luck!

 

[GrimJack]

If you hit 10-11 psi in first gear; i'm sure you would lose complete control.

Well, not quite. I run 13 psi in 1st, up to 16 psi in 5th, and I don't lose control. Grippy tires helps a lot.

 

[SupraTuner7M]

sounds like it will be very fun to experiment with different boost levels and feel the loss of traction

 

[Orion ZyGarian]

Your car makes a really nice jolt movement,and your check engine lights come on.

:lol: God thats funny..I wouldnt notice only because my clutch is incredibly exact. I have to do what I can to let out the clutch for daily driving *just* right...

...my CEL is ALWAYS on..

 

[PM-Performance]

whats fuel cut? lol. Ive been boosting mine at like 14psi for a while now. Never seen such a thing :dunno: lol

As soon as i get a new clutch in ill prob up it a bit to see where it starts to not be worth it anymore

 

[Slow_Sc3]

i have one shim on my 60trim first and second gear is about 8psi third and up is around 10ish. i havnt had any fuel problems at 10 and iv been running it for around a month now.

 

[toyota_supra_1988]

most people hit fuel cut at 12psi. but it all depends.

 

[SupraTuner7M]

okay i have heard about this all the time and always wondered how to do it. People talk about putting washers on their turbo somewhere so the internal wastegate actuator arm can't function fully to open the little flapper door to let out the exhaust at certain boost levels which in other words limits you to the factory set boost level of about 8psi. I'm just wondering how to cheaply rig a few washers to my actuator to make more boost so i can get a feal of 10psi before i buy a manual boost controller. I need someone to explain in full depth detail the procedures or send a link.

 

[toyota_supra_1988]

http://www.supras.com/04/resources/index.php?id=18&start=11