Last post on Jun 05, 2006 at 1:08 PM
You are in the Speed Shop Tuning and Modification
What is this discussion about?
#1 of 52 Got an Upcoming Mod Project? Tell Us About It!
by Mr_Shiftright HOST
Apr 06, 2005 (3:51 pm)
This topic is for those of us with big ideas but temporarily small budgets.
We aren't exactly dreaming in this topic but the projects we are describing here might take 6 months or a year to see the light of day.
I'll start with the next post.
#2 of 52 Porsche 928 project
by Mr_Shiftright HOST
Apr 06, 2005 (3:56 pm)
I have an older Porsche 928, a 16 valve V-8. It's pretty fast and an excellent handler but by today's standards it could use more HP.
Given that these Porsche V-8s have indestructible bottom ends and a nice roomy "V" between the "stand up" cylinder heads, as well as good space fore of the engine, I'm thinking that a Supercharger running about 6 psi would be perfect for this car.
With any luck, the installation you see below should produce about 330 HP and plenty of low end grunt.
Cost? I'm estimating about $7,500, including a professional install.
#3 of 52 THAT'S way cool -
Apr 06, 2005 (4:49 pm)
I've ALWAYS been a fan of 928s.
Of course, I'd take the Texas approach and do a stroker Chevy small block (over 400 ci, probably 406), with aluminum heads and Accel DFI. And a nasty, lumpy cam and Flowmasters, so folks would know there was something strangely wicked hiding under the bonnet.
Apr 06, 2005 (5:20 pm)
Nah, I need something that I can drive everyday. And besides, you can build these motors to put out as much power as a Chevy and still have the compact size for a nice clean and attractive fit.
#5 of 52 Why couldn't you drive
Apr 06, 2005 (5:29 pm)
a car with a Chevy small block every day?
#6 of 52 Re: Why couldn't you drive [driftracer]
by Mr_Shiftright HOST
Apr 06, 2005 (7:47 pm)
Because as you spec'd it, it would be an animal to drive and would sound like a pile of bowling balls in a clothes dryer I want a very docile and tractible engine...which is why I like supercharging...you can crawl or you can wail.
But no need for a Chevy...I have the car set up with a Y-pipe back of the header and a free-flow Ansa exhaust...it sounds GREAT, and with the whine of a supercharger, it would be dee-vine. Sounds very much like an American car right now but the firing pulses are just a little different than an American V8...and it revs faster and higher than say a stock pushrod engine.
Some nut actually build the 928 engine up to 600 HP but I don't expect it is very tractable either.
I'm really aiming for a very versatile car and decent fuel mileage.
Also we have to think about the drivetrain...this has the engine in front, transmission and differential as a single unit in the rear...I don't think a big brute Chevy would hook up to the Porsche 5 speed, so we got big conversion problems here...
Basically to run a Chevy I think you'd have to gut a complete C5 Corvette, which has a very similar driveline and rear suspension (GM, have you been peeking under 928s?)
Apr 07, 2005 (9:46 am)
How do the CARB boys like that set-up, Shifty? Your local smog shop is gonna see all those hoses and send you on your way.
Apr 07, 2005 (10:54 am)
It'll pass smog or I won't do it. Might have to go to a special referee. That's part of the delay.
#9 of 52 You don't want to go to a referee
Apr 07, 2005 (12:49 pm)
I think the only way you'll get by a referee is if you have a CARB expemption for the system. Being that the market for superchargers on 928s has to be pretty darn small, I'd suspect who ever developed the system didn't spend the many thousands of dollars it takes to get a CARB exemption.
Your best bet may be to bring to some little smog shop that has never seen the engine bay of a 928 and hope they think that that is the way it's supposed to look. I'd go for black tubing connectors though, the blue ones really scream aftermarket. I have them on my car and that';s the only thing the guy challenged me on last time I had to go to a "Test Only" center. I managed to convince him that the piping was all stock (which was true) and that I replaced the cracked rubber factory hoses with blue silicone, which should be legal. After that it was just a matter of passing the sniffer test, which my car did easily.
Apr 07, 2005 (1:18 pm)
Yep, I need a strategy that's for sure. I could also go across the border to Nevada--which one clever Edmunds community member suggested should have the license plate slogan "Nevada----yeah, you can do that here"