Cams for 930

Does anyone have any experience with the "C2 Super" cam grind offered by Elgin? Car is an '88 930 with K27 7200, HKS EVC, bigger intercooler, B&B headers & muffler, & slightly increased compression, among other things. Thanks.

I'm not sure about this C2 super. I know about SC cams for the best low end, 964 cams for better high end, and that SC 333 cams are a compromise. I would guess that the C2 super would be even more peaky than 964, but I couldn't tell you for sure. You should ask for dyno sheets and measurements from elgin. This would show how they compare and where they peak. I'd also talk to the people at www.imagineauto.com, they can tell you anything you want to know about 930s. I just noticed your upgrades, I'm doing the exact same stuff to my 3.0 liter turbo, how many horsepower does your car produce?

Keith
1976 930 (will soon have SC cams, best for street)

I agree with the above post. Talk with Stephen or Michael at ImagineAuto - they know their stuff and can help you find the best cams for your modifications and driving habbits. I'm using SC cams in my 3.3T, staying with stock compression for now.

Yargk - I will dyno again after the cams and compression increase, and let you know. But before that, we got 275.8 hp at the rear wheels. Thats about 60 hp increase over stock. But the real difference is in the reduction of lag. It's like a different car. Much more driveable. This is with the K27 7200, big intercooler, ZucZ Powerflow, HKS EVC, B&B Headers, and a Borla Muffler. I'm also scrapping the Borla muffler and putting on a B&B. I'm sick of having to weld the cracks in the Borla every 6 months. It did sound great though. Hopefully, I'll have better luck with B&B, and good sound too.

The Elgin Super C2 cam has been described to me by others as the preferred cam for a 930 with increased compression (compared to the SC330). Better top end, and wider power band. Compression suppesedly makes up for the slight compromise at the bottom. I am trying to find someone to corraborate this.

BTW - the dyno used has been consistently showing a 25% loss of HP in the drivetrain on cars with known BHP. (Like brand new cars). I know that a lot of people estimate only a 15% loss. But every dyno is different, and this 25% loss is very consistent over very many cars.

[This message has been edited by JohnnieA (edited 07-20-2000).]

Hmmmm. Interesting stat on dyno loss. Motorpsort Design and Powerhaus show a consistent 15% loss on their 930s, dropping down to 11-12% on some normally aspirated R cars.

If every dyno is different then what is the true HP? And how can you make accurate comparisons? I would not pay to have an engine run on a dyno if the unit was not first calibrated and certified. Demand this before laying out your wallet.

Rarlyl8 - "If every dyno is different then what is the true HP?" That's a good point, and I don't know the answer. But I've been told by several people more knowledgeable than me that a chassis dyno is only good for comparitive purposes while tuning. Before And After type measurement. And that if you take your car to a different dyno, on a different day, you will likely get different results. Maybe engine dyno's are more consistent, I dunno. Maybe that's why manufacturers quote bhp, instead of rear wheel #'s. But HP calculation is a scientific formula, and in my mind should be consistent. It's tough to believe that in the Y2K, there isn't an ability to make consistent measurements. Hopefully someone around here can shed some light on the subject.