Dmax Vega Race Car? - Diesel Truck Forum -
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post #1 of 1 (permalink) Old 03-26-2008, 04:55 PM Thread Starter
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Dmax Vega Race Car?

I figured I'd throw this idea out and see if anyone sees any holes in it.

I currently have a tube chassis 1973 Vega Super-Gas car. It was originally an Alston-built back-half ladder bar car (stock front suspension augmented by cage rails), but I changed over to an Art Morrison tubular A-Arm front frame. With an iron-headed BBC it weighed around 2250 with me in it, but I usually ran about 150 lbs of ballast for traction. It hasn't been down the track since 1993. I am in the process of putting it back together with a moderately mild (700-750 hp) aluminum head BBC. The rear has plenty of space for 16x33" slicks.

I am thinking of building a Duramax for it. I would still race NHRA Super-Gas with it, but would also take it to the various diesel events. Super-Gas races against a 9.90 index, but most people these days are setting their cars up for at least mid-8's, then setting up a throttle stop which comes on right after the launch, then times out and goes full throttle (running 9.90 at around 155 mph instead of 132 or so). I am hoping that a simple switchable "zero throttle input" circuit will work for a throttle stop. I am also hoping that I can tune for consistent lighting of the turbos after the timer runs out. Needless to say, I will run it full throttle for diesel events.

I would shoot for 800hp or so, and would try to continue using a Powerglide trans (probably one of the built units they offer for Pro-Mod racers these days). I have seen that Scott & Dustin Bentz and Greg Hogue are all using PGs with Gear Vendors overdrives, so I will look into that combination.

Any thoughts or advice?

A few other questions:
Where is the best place to find a core Duramax to start this project?

Anyone have outside dimensions on the Duramax?

Assuming I will be using aftermarket rods and pistons, does it matter which Duramax I start with?

Is the revised block of the LBZ worth spending more money for a core?

Are the heads any better between the series?

How big are the factory intercoolers? I may consider some type of air-to-water intercooler, mounted behind the driver for weight distribution. I think I remember seeing one in Orange Crush when it was first built.

How much cooling is necessary for drag racing a diesel? I was hoping to keep using a VW Scirrocco radiator for weight and size.

Michael Pliska

ISSPRO Engineering Manager

1995 F350 PSD Crew Cab Dually, 271k miles
10 ISSPRO Prototype Performax™ gauges in Pillar & Overhead pods & sitting on dash, Tymar Intake, Gutted EBPV, Tymar 3x4" downpipe, Tymar 5" exhaust, Cat's hiding in the shed, Baby Swamps, Swamps tunes, Tricumulator springs and Accumulator Valve, Tru-Cool 4590 Trans Cooler, Lock-Right Locker
1998 S&S 9.5' slide-in camper
32' enclosed tag trailer with 2 drag cars (73 Vega Super-Gas & 74 Vega ET Super-Pro)
1992 GMC Typhoon, 1973 Chevy Blazer with Pontiac 400, 1973 Trans-Am 455
2000 VW Jetta TDI - Kerma tune, Der Chimera Stage II Clutch
NRA member and certified firearms instructor, GOA Life member, IDPA member
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