sciroccio

How much boost can a stock 951 engine ?

dillon410021

I have seen 20 psi on a stock motor several times. I think 16 psi is a good spot, but It depends on mileage, maintanence that has been done already, and turbo size. Plus don't forget that supporting mods are needed to run higher than stock boost

azbanks

Proper tuning is critical.

ChrisJ951

On my first 951, the PO had done a stage 1 lindsey racing head job, 3 in cat back exhaust, DP wastegate and a vitesse stage 2 kit. I ran the car at 17psi on 93 octane pump fuel and it put down 342 wrhp on the dyno. On a stock bottom end, I wouldn't run past 18psi. That's me though. Opinions vary...a lot

running_cold924

how much $$ you have? its all bout boost, fuel and timing...

Dougs951

2bar.

Darwantae951

29psi?

Dougs951

According to the stock gauge.

18 psi seems to be a safe number with good tuning. I run 15 with a stock turbo.

Tedro951

The amount of boost a 951 can take is proportional to ones wallet. Kinda like asking "How many RPM will a stock 951 turn?"

Chris White

“How much boost can a stock 951 engine ?”

Usually the next phrase is “hold my beer and watch this….”

sciroccio

I didn't get what you meant to say, but whatever.
Next question: whats the weakest part in the stock engine that will take most damage from high boost? Pistons, rods or cylinder wall?

racerxrick

head gasket...i.e. relief valve!

toddk911

If the motor is properly set up for higher boost with proper tuning and octane/E85/meth injection, many have run 25psi or more.

However, what many are referencing here is "properly set up". That is the key and when the wrong key, things go bad quickly.

Rule of thumb/gross generalization:

Mostly stock with chip or piggy back =15psi on pump, maybe 18-20 with octane, but stock turbo 26/6 will run out first.

Supporting mods/proper tune = 18-20psi on pump, 20-25 with proper octane.

Rogue_Ant

+1 Todd, good post.

slap929

so the moral of the story is, if you have to ask, chances are good that you do not need to exceed 17 psi.