Raptor twin turbo - Page 2 - ZR-1 Net Registry Forums

A26B · 08-29-2017

Several years ago, I made up an Excel calculator for turbocharged HP calculations, with variables input for; (1)engine normally aspirated RWHP, (2)Atmospheric Pressure & (3) Boost pressure. CHP is calculated by RWHP/(1-driveline loss factor).

For a 374 in3, 9.0 compression, stock cams & top end porting, RWHP was 398Hp.

At 9.0 psig boost, 642 RWHP, 755CHP

We will see how close this is. difference in displacement would be about 12 Hp less at the crank.

Thant's my guesstimate.

rbidwell · 08-29-2017

Thanks Jerry. Being the old man that I am that will be plenty of get and go for me. My main concern is drivability and dependabilty.

A26B · 08-29-2017

I had a 1995 LT1 with the single, rear mount turbo. Compression was about 9:1, 0.030 over bore, still running stock cams, no porting, no headers, just manifolds. Auto trans with a 2500 stall converter. It was a joy to drive. A grocery getter in disguise. Got 23 mpg between Coreys shop & my home in Oklahoma. Dyno 600+ RWHP. Several of the guys at Corey's took it out & flogged it. All came back with a smile & talk about "being surprised, considering how docile it was until the pedal hit the metal.

You're gonna love it.

08-29-2017	#11
A26B Join Date: Dec 2003 Location: Arcadia,OK Posts: 3,376	Re: Raptor twin turbo Several years ago, I made up an Excel calculator for turbocharged HP calculations, with variables input for; (1)engine normally aspirated RWHP, (2)Atmospheric Pressure & (3) Boost pressure. CHP is calculated by RWHP/(1-driveline loss factor). For a 374 in3, 9.0 compression, stock cams & top end porting, RWHP was 398Hp. At 9.0 psig boost, 642 RWHP, 755CHP We will see how close this is. difference in displacement would be about 12 Hp less at the crank. Thant's my guesstimate. __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.

08-29-2017	#12
rbidwell Join Date: Sep 2004 Location: Limon, CO Posts: 126	Re: Raptor twin turbo Thanks Jerry. Being the old man that I am that will be plenty of get and go for me. My main concern is drivability and dependabilty. __________________ If life is just a highway, then the soul is just a car. meatloaf

08-29-2017	#13
A26B Join Date: Dec 2003 Location: Arcadia,OK Posts: 3,376	Re: Raptor twin turbo I had a 1995 LT1 with the single, rear mount turbo. Compression was about 9:1, 0.030 over bore, still running stock cams, no porting, no headers, just manifolds. Auto trans with a 2500 stall converter. It was a joy to drive. A grocery getter in disguise. Got 23 mpg between Coreys shop & my home in Oklahoma. Dyno 600+ RWHP. Several of the guys at Corey's took it out & flogged it. All came back with a smile & talk about "being surprised, considering how docile it was until the pedal hit the metal. You're gonna love it. __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.