Dave_Dc2

GSR 9.2:1 forged pistons and rods with arp head studs...skunk2 pro series vavetrain. stock valves. whats safe to boost?

HarfordCTR

should be asking what is a safe WHP for your setup, PSI means nothing really. 10 PSI from lets say a GT28 wouldn't be any where near what 10 psi from a GT35 would make in WHP etc

Dave_Dc2

well i will be running a sc61 on 10lbs and itll make 290whp bc the person im buying the kit off of has the SAME exact set up and made 290whp is that gonna be safe or can i even take it higher?

E85B18

HarfordCTR's advice is very true. What turbo will you be running? With your set up, the weakness will be your sleeves and fuel. Did you upgrade your fuel pump? I personally wouldn't run the stock sleeves over 350whp, but some people on here are running over 600

Dave_Dc2

ya i have the walbro 255 and running 91 on 550cc

E85B18

Word. 12 psi is fine with a good tune. Go for 350whp!

Schister66

You should not be basing your goals in terms of PSI. With a stock-sleeve engine with forged internals, you're looking at a MAX of 550whp with a good tune and sufficient fuel. For example, i'm shooting for 450whp this summer on the setup listed in my sig. That's a pretty safe range considering the compression, turbo and fuel i'm running. There are more variables in this decision than just the pressure ratio.

E85B18

Did you read the thread Schister? That point has been made. I based my PSI recommendation on him saying he has a sc61. Like you I think E85 is a good idea but I dont think 400 - 500 whp on stock sleeves is a good idea.

mycarslow

ask your tuner

dpetro1

550cc injectors are gonna max at about 300-350whp so thats a bigger factor than the motor setup. with bgger injectors i think you could run 400whp (maybe 14psi)

Schister66

I skim threads...the majority of replies are useless to me. I state my point based on the information given and move along. I may have reiterated something that was previously stated, but it adds to the credit of the original. As for the SC61, if he's running such a large turbo with higher flow rates, why limit him to 350whp? If i were to shoot for 350whp, i would have gotten a properly sized turbo for the job.

With his engine setup, 350whp is pretty lame. I would be disappointed if i were running a sub-400whp setup on a built engine. There is no point to limit yourself to 350whp...hundreds of people push stock sleeves much further.

marcj

5.7 lbs is the most you can boost

E85B18

Thanks for the well written reply. I can see with so many posts, you clearly know what you're doing. You're right that re-posts credit the original. I also second your comment about "running such a large turbo with higher flow rates, why limit him to 350whp" I drove my stock GSR with a 60-1 on 7psi for 3 years. The tuner told me thats all that was safe so I trusted him, 3 years later I learned better. lol. The car almost felt n/a with such lag and little boost. This turbo is too big for a goal of 290, or 350 for that fact. But he has it so go with it. With your internals go with what you feel comfortable. Some run only 275hp on stock sleeves, others run 627. Like I said, id go with 350. However 450 is more fun

E85B18

Is this a joke? 5.7 psi lol

JDMs1eeper

I agree. Im running a stock LS at that range and plan on more

Schister66

Yes...you have to be around the forum more to know when a certain member is joking and when others are just plain ignorant. He falls into the former

Topdawgg

5 psi...





on a GT4288R









.............