how high can you go?

[hkssupra]

hello everyone, new to forum, i have a 87 supra that i have been working on for quite a while now, i just recently drove it for the first time and when i hit full boost, i was only at 5-6 lbs. the car has a manual bc, do you think possibly it could be bad? i had it turned up to about 10-15 lbs, i know its not my charge pipes or vacuum leaks so this is the only thing left i can think of. Also i was wondering how high i can boost safely. the car has- hks f-con,fcd, stock pipes and intercooler, hks bov, and straight threw exhaust(hollow cats) and greddy muffler. what psi do you think ill be safe running? any help is appreciated..thanks

[rocktownsupra21]

i wouldnt run any higher than 10 or 11 on the stock turbo

[hkssupra]

that sounds good to me, i dont want to fry that turbo. i have herd that you can upgrade the stock turbo, has anyone done this? im not sure what the stock trim is but what could you upgrade to?

[west_side_supra]

uh if i remember right it the stock trim to a GT trim they have the trims availible on ebay just look around, search for ct-26 maby

[Supra2NR]

10-15 lbs?
ddnt hit fuel cut?

i think u could have fried that turbo already, hopefully it was still in good shape
when you turned up the boost

my stock turbo gave up on me at 15 psi

[hkssupra]

ill search ebay tonight and see what i can find, and i havent had it up past 6 psi yet cause i think i my mbc is bad, it was cut up but still hit stock boost, i think im going to take it out and just shim the wastegate, and as for the fuel cut, i have the hks f-con and fuel cut defender, so i dont think i need to worry about fuel

[dcrusupra]

Originally Posted by hkssupra

ill search ebay tonight and see what i can find, and i havent had it up past 6 psi yet cause i think i my mbc is bad, it was cut up but still hit stock boost, i think im going to take it out and just shim the wastegate, and as for the fuel cut, i have the hks f-con and fuel cut defender, so i dont think i need to worry about fuel

Fuel cut is there for a reason. If you are still on the stock fuel set-up you might want to keep fuel cut there.


The most my engine has seen is 10-11 psi. Shortly after I blew the coupler on my 3000 pipe to throttle body. Now it's back at 8 psi.

[hkssupra]

thanks for the info, i plan on keeping the fcd on it, but im not going above 10-11 psi, and if i do start blowing charge pipes, ill have to back it down, untill i get the hard pipe kit

[Supra2NR]

Originally Posted by hkssupra

thanks for the info, i plan on keeping the fcd on it, but im not going above 10-11 psi, and if i do start blowing charge pipes, ill have to back it down, untill i get the hard pipe kit

although i was running a little richer than i preffered,
i was fine a 12 psi, when my car was stock,
til my friggin clutch gave out on me,
then i turned the boost down to 10 psi

jus get a walbro 255lph fuel pump, and a aeromotive fuel pressure regulator
you can still stretch out the injector to compensate for the extra boost
and the pump and regulator, you can adjust if needed

[supradrift]

i have 550s and a lexus afm if i get a fuel pressure regulator i know i can safely turn my boost up but what do you need to do about the fuel cut? does anybody know