what can i raise my boost to with this list of moods. i only have it at 8 right now


full exhaust
turbos wired together (rookie, i know)
intake manifold
apex power fc
intake
y pipe

 

you're able to only run 8 psi all the way to redline with an open exhaust and stock wastegate?

Do you have a stock fuel system?

Also, you need to get tuned regardless of how much boost you plan to run.

 

You have a big time boost leak. Watch out when you fix it, because then you'll probably creep to 15+ psi and blow the motor.

If you can control boost creep (search "restrictor plate" or "porting wastegate"), do not run more than 12 psi or so. The PFC needs to be tuned.

 

yes i dohave stock fuel. i'm tuned right now. at full boost my a/f ratio is about 10.7

should i change my wastegate

 

they are saying that with all thos mods.. and a full exhust u should be creeping.. so you either have a boost leak or something thats what they are trying to say regardless of being tuned

 

its at my chose to run 8 pounds because i wanted to get use to the car

 

Upgrade your fuel pump before you start to push it past the 12psi mark. Really recommended anyways... So I guess to answer your question...~12psi.

 

ok cool thank you. what is the a/f ratio should i be aiming at when going with higher boost

 

No, you're not understanding us. With an open exhaust, there is very little restriction/backpressure. On a properly functioning FD, the small stock wastegate becomes overwhelmed and cannot vent enough exhaust energy away from the turbines, thus boost creep and uncontrollable boost. It isn't possible to run 8 psi with stock twins and no cat on a properly functioning FD.

I agree that you should look into a supra tt fuel pump, find the source of your boost leak/exhaust restriction, and get tuned for 12 or so psi.

 

if i was getting boost spikes it would show on the boost controller right?? BEcause it stay at 8 the whole time when im boosting, it doesnt go up at all. Plus i just got the car maintenced and they told me everything was good. They checked everything because i am preparing the car for a single .

 

I dyno'ed last weekend and stock injector duty maxed out at 94% at 13#. At this point, A/F was about 11 according to the dynosheet. It's time to upgrade to 1200cc!

 

did you read what I typed in my last post? I'm not talking about boost spike----I am telling you that you should get boost creep up to at least stock 10 psi with an open exhaust. who is checking your car over? a rotary specialty shop?

 

With those mods you cant WOT the car and not get any fuel cut. How does your car still run?

 

Because he's only running 8psi.

 

I'm now running 0.8bar on non sequential twins and stock fueling with Front mount IC and decat and induction, and running rich 10.8 AFR and seeing a only 84% duty on the injectors. Tempted to push it seeing as I have the fueling capability but don't know what a stock engine is capable of handling. ?

 

i just found out that i do have an upgraded fuel pump. ITs a walboro pump i forgot to see which one. The guy that i bought the car from tuned it for 12 pounds because he was running it at 12 for awhile. Then he dropped it down to 8 i don't know why but he said the car can definetly handle 12 pounds with no problem.

 

You still aren't getting it. If everything was 100% with your car, you could not hold 8 psi with a midpipe. Period. You have a boost leak.

 

it's not the stock engine, it's your stock turbos and your fuel system. what engine management are you running? with a power fc and tuning, you can probably run 14 psi or so.

 

^^^All this good information above going to waste lol^^^
I wish you guys would visit my threads more often!

:smiley_12

 

Thanks - The engine is not ported as far as I am aware, YES I am running a power FC, and have wideband and happy enough to play with map myself for fine tuning.

Its a cat back, Full non sequential turbo mod, Greddy Elbow, Front mount IC, Aircon and air pump removed, HKS mushrooms, Magnacor leads, But standard injectors and a non ported engine.

Last night in the UK it was bloody cold and was spiking to 14psi tailing back to about 11/12 at the top and and yeeehaa what a difference. Now need to investigate what the standard clutch will hold, as it was pulling so hard it was tearing my tyres and tarmac, and felt like the clutch was only just holding it. Damns I love my car

 

Yup, you'll probably need to look into a clutch. My stock one was dying at only 50k miles after I installed an intercooler, intake, dp and catback.

 

Yeah, as soon as I got a couple mods my clutch gave up.

I still don't understand how he was hitting 84% on duty cycle and only hitting 8psi of boost?

 

Cheers guys, but was the clutch failing due to wear or power not holiding it. ?

My 84% duty was at 0.8bar circa 10psi and running rich.

 

My clutch pedal kept engaging higher and higher. It was getting so bad that I had to slide my seat back a notch.

 

but how do i have a boost leak. I am reading what you guys are saying but i don't unserstand because i am running 8 pounds of boost and i have a full exhaust i have a boost leak? I also have a pfc but the guy that sold me the car said he put it at 8 pounds.