10psi ok on stock SR with upgraded turbo?

[aleph1]

Mods relevant to this: Walbro pump, stock 370cc injectors, stock FPR, HKS T2530 turbo, Greddy VSPL front mount, located in Colorado (altitude...5200ft+), 91 Octane.

Currently running at 7psi and it holds til redline, would it be ok to turn the actuator up to 10psi and be fine? I realize its probably ok on a stock turbo, but since this one is pumping out a bit more air, just curious if it will be fine...

[D1 guy]

12psi would even be ok

[getnrowdy23]

i agree with d1, 12psi should be fine too

[IanS]

PSI is PSI, it doesnt matter whats making it, big turbo, little turbo, its all the same amount of air

[virus77]

^ stop giving false information about stuff you dont know about, you could cause a blown motor. PSI is far from the same within turbos. A gt3071 at 15 psi is worlds different from a t-25 at 15 psi. airflow is airflow ..... PSI is a pretty worthless number.

[D1 guy]

well said virus. There is a large amount of difference in my car at 17psi with my gt2871R compared to my old t28.

[ILikeMy240sx]

well I wouldnt really call psi worthless but yup what virus said...

even at sam pressure level different turbos can flow different amount of air.

[Scooby24]

PSI is PSI, it doesnt matter whats making it, big turbo, little turbo, its all the same amount of air

Holy crap that's so wrong.

PSI = Pressure

Pressure /= volume of air

15 PSI on an extremely efficient turbo is going to have a higher volume of air that is exerting less force due to the more efficient compression and flow the turbo creates.

When it explodes that volume of air expands generates heat etc. THATS where you can run into problems.

So the PSI can be the same...but the stress on an engine can be VERY different.

[aleph1]

dont worry guys, I'm well aware of the difference between PSI and CFM. But it is disturbing that someone is telling people like it is the end all answer. Thanks, I guess I will try boosting to 10 and if i blow....the 2 that said it was ok will pay for it =P

[luv2spedup]

dude u should be good boostin 10 psi, but try to use 93 octane or higher

[Scooby24]

There are only two major issues I'd worry about with the upgraded turbo.

1) Mechanical limits on the engine. 10 PSI is the force that's going to be an issue with the mechanical limits...but the SR is pretty stout so you should be fine.

2) Extra heat. The extra heat is going to want to cause detonation. You can pull some out by going to a colder plug...or you can reduce the timing....or you can throw fuel at it....either of those three or a combination of all of them will help keep your 10 psi a safe level.

You should be fine. Good luck.

[aleph1]

The plugs are probably the easiest and cheapest way. I may know a good amount about engines, but god help me, I cannot grasp how to use a timing light effectively. lol As far as the fuel, something like an AFC would work?

Either way, if it were your engine/car, would you turn it up to 10 as is?

[virus77]

you can probably push 10 psi but im not a fan of raising the boost on a car without having it tuned. Im sure there are people that will say they have done it and its fine but lots of people end up blowing motors this way so its up to you. Get some bigger injectors and an SAFC/ROM Tune and crank the boost up knowing you have the supporting mods.

[luv2spedup]

you can probably push 10 psi but im not a fan of raising the boost on a car without having it tuned. Im sure there are people that will say they have done it and its fine but lots of people end up blowing motors this way so its up to you. Get some bigger injectors and an SAFC/ROM Tune and crank the boost up knowing you have the supporting mods.

he's rite tunnig plays a big part in ur car reliablity and performance

[Turb0wned]

well said virus. There is a large amount of difference in my car at 17psi with my gt2871R compared to my old t28.

ey d1 how much boost have u ran up to safely on ur gt28 u do have stock internals right? just wondering because as u know i just installed mine but still waiting on my injectors

[D1 guy]

Im running the nismo 555cc injectors, but all the nismo 555cc yellow tops are rated at 615cc for some reason. I run somewhere between 17 and 18psi....about 1.3 bar on high boost and on low about .80bar...around 10-12 I think. It takes the 18psi like a champ!!! I like this car better than my supra:)

[Scooby24]

Im running the nismo 555cc injectors, but all the nismo 555cc yellow tops are rated at 615cc for some reason. I run somewhere between 17 and 18psi....about 1.3 bar on high boost and on low about .80bar...around 10-12 I think. It takes the 18psi like a champ!!! I like this car better than my supra:)

1.3 is actually a hair under 19 psi.

[D1 guy]

sorry I was calculating it in my head really fast. I guess it would be about 19 psi....oh well, my car still likes it