How much boost for 16g?

[jessicas gst]

Hello, I recently purchased a 96 GST with a 6 bolt block and 2g head. it also has a evo 3 16g.
It is set at 12-13 psi.
Is this safe with stock fuel and stock intercooler?

What is a safe boost level for this turbo on stock fuel?

Thanks.

 

[Black_Bullet]

I got away with 15 on a evo3
w/ a act2600, fidanza flywheel, fuel pump, and full 3in exhaust
with no problems or knock...
( Stock intercooler hoses and all. )

Not telling you to run 15lbs though...
We cant tell you what you can run every car is different,
get a logger and find out for your self. Run x amount of boost till you see 5-6 counts of knock
then turn the boost down one psi. Im thinking max of 14-16psi range though as long as you have a fuel pump.

 

[jessicas gst]

Well the problem is... I dont have a upgraded pump.
And until i do i just want to make sure i dont go lean.
I just wanted to see if anyone knows a safe psi for this turbo on stock fuel.

 

[218dsm]

On a stock fuel system you should push between 10 and 12. I wouldnt go any higher until you get an upgraded fuel system or some kind of logger or tuning device.

 

[Splitpi]

^^^ <--- I agree with the above.

 

[FASTSPOOLINGST]

u should be worried about your clutch slipping. It won't be long if it is stock. My stock clutch went out in my 95 GST about a week after I put my evo III turbo on my car.

Boost level is fine. Remember too, if u upgrade ## pump to a 255 ## gonna need to get AFPR to control it ### it will over run the stocker.

For the EVO III turbo, i would recomend u get a 190 pump and some 550cc injectors, this is a good combo that requires very minimul tuning.

 

[jessicas gst]

Clutch is a ACT 2100 with lightweight flywheel. so it should be fine for now.
Thanks for the responses guys.

 

[TSi16GAWD]

I would do what they said above. The most I have seen run on a stocker, being logged, was 14. I would stay in the 10-12 range.

 

[jessicas gst]

Yeah thats what my husband set it at but he told me to ask around for more info.
He has a 91 MR2 Turbo http://www.freewebs.com/unico420/
But hes not real familiar with the 4g63.

 

[daren_p]

Welcome to DSMTuners Being a new member you should take the time to read over the rules posted on this site. Always search before you ask a question because most of the time your question has already been answered, as this one is a very common one

Now with that being said, first thing you want to do is rewire the factory pump. Pump flow is directly related to voltage & from factory you will see several volts less then it should/could be. A rewire kit is cheep (or you can piece your own together) & an easy fix. This will allow abit more safety. Every car is different, so you won't know for sure until you have a logger but with a rewire I'd keep to the 12-13 psi range, to be on the safe side.

Personally I was able to run my evoIII up to 15.5 psi on a stock rewired fuel system but I was also seeing 107% injector duty cycle (not physically possible to have above 100% IDC, but this is what the ecu was trying to inject to provide the correct air/fuel ratio for the amount of air the turbo was flowing). I was running DSMLink at the time so I was able to monitor knock to make sure this was still safe for my setup. The reason why I still wasn't knocking on this setup is because the factory fuel maps are extremely rich & even though I was running out of fuel, it still wasn't leaner then the average "aftermaket performance tune". At WOT you factory tune has an average tune around 9.5 to 1 (varies abit depending on the rpm), while most tune their car on pump gas to be more around the leaner 11 to 1 range.

 

[Black_Bullet]

But if she has stock exhaust stock intercooler set up and stock head, she shouldnt be running 100% idcs even at 15psi due to the motor not flowing as much air as a car with 15psi e3 but with full exhaust and intercooler set up..
Look at the injectors as how much air they can match not how much boost they can run, therefore thats why i said everycar is different, everyone will just give you their experiences with their own cars. You may get away with more or less then i or anyone else did. But that just goes for air flow, supposing you had enough fuel for 18psi, the heat soak will be the next enemy, but under 17psi i found it not enough to heat soak as long as your stock smic is clean and not damaged. Logger, and wideband will tell you what you need to know better than we can. Leave the boost alone till you get those things, along with a fuel pump as mentioned eariler. And also do as Daren P stated