Doing a 5.3 Turbo build up in a mid-engine GTM. The transaxle has a Tq rating that I Dont need to exceed (450rwtq) but would like as much HP as possible. Anyway to decrease TQ and add HP on a Turbo build?

Many 5.3 turbo builds around 6psi show something like 390RWHP/450RWTQ, would like that flipped if possible.

 

Talked to Jose at Forcedinductions.com he mentioned going with a larger turbo would lower Tq and raise HP.

Anyone have any recommendations? I have some room to work with.

Don't need to exceed 450RWTQ but hp can be a different story.

 

Horsepower is just a function of torque and RPM. Moving your power farther to the right on your dyno graph will net you less torque in the early RPM range. A larger turbo won't spool as soon which would shift power to the right. Cam selection can shift power to the right also. A boost controller using the boost x RPM ramp method could get the same thing done too.

 

Thanks for the reply, totally new to turbos. I am wanting to use a stock 5.3 with just ad LS6 intake. With the factory cam I believe they shift at 5700RPM, so probably shifting there?

May need to look into, anymore info?

 

Lots of ways to go about it...but you wont be able to make alot of hp with alittle torque like a honda.

 

If I can do 450-500RWHP that is fine, car only weighs 2500lbs. Mainly worried about breaking the transaxle thats all.

 

That wouldnt be a problem. I personally would put a proper turbo on the thing and control it with timing and/or boost. That way if you ever upgraded the drivetrain you wouldnt be stuck with a laggy turbo.

 

There's a NA build (not 100% sure it was NA) in the dyno section that made ~800rwhp and ~500rwtq. So much higher HP ouptut than TQ can be done, just need the right formula to do it.

 

You must have missed the title of this thread.

 

Large short runner sheetmetal intake will kill torque like nobody's business.

 

Yea intake runner length can most definately change the Tq curve, Figure a higher A/R ratio will shift the power band up to causing the engine to spool slower.

 

Intake runner length and a custom specced cam will certainly help with that.

 

That is correct. If your using the turbo to tune the power curve to some degree that is how it would be done.