Cornel

Cornel's 94' Formula Firebird with Custom Eaton M112 install.

I have owned this car since new and always wanted it supercharged positively. With snow performance water injection and a custom Eaton M112, Fuel Rail and intake manifold etc. I am really close to getting this running. Needless to say I am getting excited! Check it out and enjoy!.

I have been tuning and will be doing a dyno pull soon to see what she does! This thing really hauls !!

Update Aug 1/08

I have dyno tuned this car and here are the dyno results. 420 rwhp and 424 rwtq which calculates to 494HP at the flywheel and 499 Torque with 15% drive train loss. Note lean tip in causing stumble. This stumble is not there if I accelerate from a higher RPM or smoothly accelerate at low rpms. I will try to tune this out!

Engine Configuration Details:

1994 LT1 350 Cu.

Heads: Stock LT1, light porting with 918 beehive springs ARP 3/8 studs comp Pro-Mag 1.6 Roller Rockers, Comp 5/16" High Tech pushrods with LT4 guide plates and crane anti pump up roller lifters. Stock Chamber size 58cc with 1.94" intake and 1.50" Exhaust valves.

Block: Stock 4.00" bore with TRW Speed Pro -5cc Forged pistons, pressed pin. Stock Forged I beam rods 5.7" resized with ARP fasteners. Nodular Iron 350 crank balanced externally at rear. Melling High volume pump with 3/4" pickup. Two bolt mains with stock caps. GM stock timing chain and Comp 07-467-8 cam.

Ignition: GM Opti Spark (1994' type), Taylor "409 Pro Race " 10.4mm wires, NGK TR6 -IX plugs, stock coil, Crane HI-6S box with 2 bar map boost retard.

Exhaust: SLP 1 3/4" shorty headers with Y pipe to 3" SLP cat back, Magnaflow cat and Magnaflow Muffler. I hate these headers!

Intake manifold: Entirely custom CAD designed and fabricated from 6061-T6 aluminum welded construction, has by pass circuit , IAT sensor port, PCV port , and vac ports, 58mm LT1 BBK throttle body.

Fuel Rail: Entirely custom fabricated 3/8" stainless tubing with machined stainless injector bosses and mounting brackets, stepping down to 5/16" after pressure regulator, fits factory quick connect fittings. Aeromotive 1:1 fuel pressure regulator.

Supercharger: Jaguar XKR supercharger (Eaton M112 internals) . Modified, cut off mounting brackets and shortened nosed drive to custom length and polished and installed meth injection port.

Water/Methanol Injection: Stage II Snow performance MAF controlled Kit using 50/50 water/meth and 374ml nozzle with 150psi pump pressure.

This is the AFR and intake air temp graph from my data log.

My AFR has a lean tip in to about 16:1 for and instant and then settles to 12.2:1 to 12:1 right across. The intake temps with water/meth start at 161 deg F and drop to 135 deg F and then slowly climb back to 160 deg F. There was no sign of detonation on my knock sensor @ 27 deg timing straight accross with this tune.

Dyno Video!

Another video

In conclusion I feel that the cam I used which is particularly a normally aspirated cam is wasting boost with 7* overlap. I will try a custom grind to see if there is an improvement. Secondly I think the Jaguar style M112 has a very restrictive intake port limiting cfm. I also feel that the intake duct work is too long and my ram air hood would eliminate some bends and restriction. I can't say I am disappointed but I think I can squeeze 450 rwhp and 460 rwtq from this setup with a cam change and improving the tune. The real gain is going to be phase two with the Whipple 140ax project next expecting 600 rwhp +.

Current Cam Spec Card.

Dec 12/08

Hey everyone! I thought I would give an update as to my progress. The design for the new manifold for the Whipple 140ax and the Whipple 175ax is near completion. I will be casting the first manifolds after Christmas and begin building up the first model to test! The new manifold design is universal to allow different blower combinations on the top via adaptor plate. As far as I see the manifold will fit the Eaton TVS, but was primarily designed for the Whipple 140/175. I am still going to use water/meth injection and could not find enough room for an effective intercooler. I am making a custom elbow for the S/C to the throttle body and the new design has it facing forward over the drivers valve cover to make use of the factory throttle linkage. I am hoping that the casting process will give me some good parts. Here is two casting core prototypes of the new manifold. I am hiding the internal passages for now!

The final manifold will be similar to this only with injector bosses and bypass ,and pcv porting.