Raptor twin turbo

[rbidwell]

Corey Henderson is in the final stages of tuning the 90's Raptor twin turbo project. He said it should be done this week.

[Ccmano]

Corey Henderson is in the final stages of tuning the 90's Raptor twin turbo project. He said it should be done this week.

Is this one of the Raptors that Ron Hanselman was working one a few years ago. What ever happened to that project. Last I heard tuning was an issue.
H
:cheers:

[rbidwell]

This is Mr. Hanselman's project. Corey Henderson has re-designed parts of the system. If I understand right Corey had the car running on the original ecm, but is now tuning using the mega-squirt system. He has not mentioned any tuning problems, but I guess we will know in the next few days.

[gbrtng]

Ron, are you coming to New Braunfels to pick it up?

[GOLDCYLON]

Was this a low compression LT5 build as well ?

[rbidwell]

Yes, I will be going to New Braunfels to pick up the car, if I don't get it sold first. This is a low compression build. I think 9:1. Lozano Brothers did the machine work on the engine which has new rods and pistons. Corey suggested original cams and that is what it has. The engine had been ported and polished at South Georgia Corvettes. Also has new clutch and pressure plate with bigger after market radiator. It is a 368 ci.

[Bob Eyres]

So figuring around 540/550 chp. For a NA 368 with those mods. What is the speculation it might be with the turbos?


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[rbidwell]

Around 615 rwhp.

[Billy Mild]

Only 615? I hope that is at low boost.

[rbidwell]

Should be around 9 psi. That is around 725 hp at the engine. I'm guessing Corey is busy trying to stay dry right about now.

[A26B]

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]

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]

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.