dyno numbers / upgrades done

[sammy]

on my 90 that made 409.9rwhp and 373.3 tq on coreys dyno .he ported both the plenum and housing . the plenum had the center divider removed and the injector housing the center was removed approximately 1 in down and 36.5 mm from then on .

[boostedmaxPSI]

Originally Posted by sammy

is your 91 a zr1 supernatural 475?i have a 92 supernatural 475 without the aero bodythat made 392 rwhp with the only mod being stainless works headers . totally stk it made 373 rwhp.

It a 475 but does have a few other things done. Last Dyno was many years ago and put down 440 to the wheels. Looking to validate that number this Friday with an updated tune and Dyno session.

[LGAFF]

440 would need some big ports and maybe cams....who did the port work? Also depends on the Dyno....the fastest 350 puts down about 470+ with some massive porting..

[boostedmaxPSI]

Originally Posted by LGAFF

440 would need some big ports and maybe cams....who did the port work? Also depends on the Dyno....the fastest 350 puts down about 470+ with some massive porting..

In all seriousness the car is a bit of a mystery still. I cannot get Callaway to disclose all that they have done to this car. It was initially their development car for the Supernatural program. Here's what I've been able to piece together.

Fully ported heads, IH and upper plenum. I mic'd the IH and plenum at 35.56mm. The throttle body has also been ported and a big bore kit put in to make the TB a 63mm unit. There was some cam timing adjustments done but not sure to what extent.

Single mass flywheel, speedster exhaust( this is a 3" system all the way back to what are basically glass packs then exits center of the car with Callaway DD exhaust tips. Finally 3.92 gears.

The car was later tuned by Performance Associates in San Dimas, Ca. Where the car reportedly made 440rwhp on 91.

Again, I have a session with Corey this Friday to retune the car for 93 octane a new injectors. We'll see what happens. I personally am not chasing a number. I just want the car to be tuned. It's already a blast to drive.

[LGAFF]

It could have cams if it was a test car...

[boostedmaxPSI]

Originally Posted by LGAFF

It could have cams if it was a test car...

I honestly don't know. I've exchanged several emails with Reeves and have only been given bits of info. According to the Callaway sales book. The SNATs all received a new crank, rods and piston for a lighter rotating assembly. The only only difference from the 490 cars and the 475 cars were the header cat that Callaway makes.

Fortunately I've been I touch with the first owner that purchased the car after Callaway was done with the development program and have a mound of documentation but not everything has been fully disclosed to either the first owner or myself. Adds to the mystery I suppose.

I think I will just start telling people that it has "Callaway Majic" inside.

[RICKYRJ1]

what would crank HP be if it is 440 to the wheels? 550?

[boostedmaxPSI]

Correction. Just looked at the Dyno report and it was 435 whp.

300@4000
340@4500
390@5000
405@5500
435@6000

Nothing past 6000rpm. Makes that about 500 crank Hp.

[LGAFF]

ported heads should be making power up to 7K....hp numbers seem reasonable for what you have....515-525hp

[boostedmaxPSI]

Originally Posted by LGAFF

ported heads should be making power up to 7K....

Nothing noted past 6000. It's not a Dyno sheet just an invoice report from the Dyno facility written just like I posted above.