I bought a C4.
Its a diff animal than the c3's. you ride between the frame rails down low and the seat of the pants feeling is awesome.
I will have another. They are the best bang for the buck in the sports car world imho.





With the black rims and the red hash marks, it looks like the PO was going for a GS Clone.
Wouldn't bother me one stitch. The pictured car is still a very well put together vehicle that will give you many, many, many (many) smiles.






Good luck with it and enjoy the ride.



I really like the clam shell hood on the C4 and it would be fun to work on a car like that - at least on the engine. The C4 i would go for is the ones with the hard top convertible. I worked with a guy that owned one and man that little hard top looked killer but he was into flipping cars and wanted to much when he got ready to sell it. But with the EFI those C4 cars make great daily drivers. Alot of owners race the LT1 but u will find they are a bit more expensive (not a real lot more as the internals are the same) to build and building to over 400 c.i. will not be easy as a GEN I block.
So let me blab a little 'bout intakes for the LT1 here. The stock intake is fine for most performance as its short runners are so short that u really dont get any pulse wave contribution until past the 7,000rpm limit of the Opti-spark distributor. The light/diode controlled Opti spark loses resolution over 7,000rpm - at least thats what ive been told though i havent proved this with my car. Well then below 7,000rpm the LT1 intake provides a flat power curve - not peaky at all. Its fairly low restriction helps the motor breath without modification. But the runners are so short i can imagine there is some reversion inside. Anyways there is a lot of GEN I intake conversions for the GEN II LT1 intake and i think thats the best route to go for an intake improvement. Single plane Victor Jr is very popular. It takes adding fuel injector bosses for the fuel injectors, changing the bolt holes and an air horn to feed the plenum. And it looks kinda bad azz with the air horn necking forward and makes old school single plane power. Another popular conversion is a Holley Stealth RAm. Those look pretty bad azz to and C4 owners say they make great power right where u want it below 7,00rpm.
Ok congrats and keep us updated. BTW the C4 forum has a great bunch of poeple with a lot of experience and good straight talk help.





1. The brakes suck. My C3 has Hydro Boost and Wilwood calipers. So I gues I'm spoiled. The C4 ABS is nice, but not as much whoa as my C3.
2. We got five runs in the morning and five in the evening. By run four the engine was getting really hot. Not in the red overheating zone, but pretty hot. The engine goes way down in power when hot. It's liike the rev limiter is kicking in, earlier and earlier. Everyone there says Opti-spark and ignition woes. The car cooled down over lunch, ran strong for a couple of runs, and lost power again. I'm thinking weak valve springs, getting hot, but no one agrees with me. After cooling off, the car idles fine, and gets 20mpg on the way home. Any ideas on why the engine loses power with rpm and heat. I guess I better start spending time in the C4 forum. Changing springs is easy, replacing Opti-spark parts are a PITA.
Bee Jay




1. The brakes suck. My C3 has Hydro Boost and Wilwood calipers. So I gues I'm spoiled. The C4 ABS is nice, but not as much whoa as my C3.
2. We got five runs in the morning and five in the evening. By run four the engine was getting really hot. Not in the red overheating zone, but pretty hot. The engine goes way down in power when hot. It's liike the rev limiter is kicking in, earlier and earlier. Everyone there says Opti-spark and ignition woes. The car cooled down over lunch, ran strong for a couple of runs, and lost power again. I'm thinking weak valve springs, getting hot, but no one agrees with me. After cooling off, the car idles fine, and gets 20mpg on the way home. Any ideas on why the engine loses power with rpm and heat. I guess I better start spending time in the C4 forum. Changing springs is easy, replacing Opti-spark parts are a PITA.
Bee Jay
My engine used to get hot every run until I wired an override to the fan relay so I could keep the fan running while waiting in line, and I could also turn them on again right after the run to cool things down.
1. The brakes suck. My C3 has Hydro Boost and Wilwood calipers. So I gues I'm spoiled. The C4 ABS is nice, but not as much whoa as my C3.
2. We got five runs in the morning and five in the evening. By run four the engine was getting really hot. Not in the red overheating zone, but pretty hot. The engine goes way down in power when hot. It's liike the rev limiter is kicking in, earlier and earlier. Everyone there says Opti-spark and ignition woes. The car cooled down over lunch, ran strong for a couple of runs, and lost power again. I'm thinking weak valve springs, getting hot, but no one agrees with me. After cooling off, the car idles fine, and gets 20mpg on the way home. Any ideas on why the engine loses power with rpm and heat. I guess I better start spending time in the C4 forum. Changing springs is easy, replacing Opti-spark parts are a PITA.
Bee Jay
Plenum/intake heat soak would be my main guess, EFI is more temp sensitive. Might try a cheap experiment and bring a cooler of ice and stack it on between rounds. Also this is why some move the IAT sensor to the airbox. People will cry bloody murder that it doesn't make any more power, but it's about being more consistent and keeping the sensor from heat soaking in the intake.
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