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IFLYASA

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    1999 Porsche 911 C2

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  1. IFLYASA
    If that were the case using 8%, my car with the mods would only have about 285hp at the crank. That would be a decrease of 11 horsepower, rather than an increase of 14 horsepower. With headers, exhaust and intake, I don't believe 8% is correct.
  2. IFLYASA
    Well you know, I'm just trying to get an accurate crank horsepower after my dyno trip. :P
  3. IFLYASA
    I have had several discussions about crank horsepower vs Rear wheel horsepower. I wanna got more opinions form the Porsche board. Mostly from what I have read, most people assume a 15% loss from the crank to the tires. For this calculation, you would mutiply the crank horsepower by .85 Example. A 300 horsepower 911 has (.85)*300 = 255 wheel horsepower. Now, the person who dynoed my car says he multiplys 1.15 to the wheel horsepower. This is not the same. Example. 255*(1.15) = 293.25 crank horsepower I also looked at the TPC Supercharger website. They also use the 1.15 method. Example. They claim the supercharger has 378 wheel horsepower, and 434 crank horsepower. 378*(1.15) = 434 crank horsepower. My point is, this 1.15 method does NOT assume 15% loss from the crank to the wheels. It assumes 13.9% loss to the wheels. Example. 434*(.87) = 378 wheel horspower. So if TCP or the dyno shops use this method, and it truely is a 15% loss from the crank to the wheels, they are shorting their calculations at the crank. Any thoughts?
  4. IFLYASA
    Any suggestions on width size? I'm planning on 7mm in the front, and 14mm in the rear. Does it really look bad going larger than that in the rear?
  5. IFLYASA
    Thanks Izzy, you "Da Man"!
  6. IFLYASA
    I'm in the process of purchasing some wheel spacers. I know the correct size for the extended bolts. I have noticed on the H&R spacers it says the original cone washers must be reused. I pulled off an original bolt to look at these cone washers. The bolt has a ridge that prevents the cone washers from coming off. How do you get these off to reuse them? Grind the ridge down? Or, if I purchase the extended bolts, will they already have the cone washers? I'm having a hard time finding the extended bolts. I need 52mm and 60mm. Any suggestions? Thanks!!
  7. IFLYASA
    Funny you should ask. I just emailed them about their dyno. If you go to the fabspeed website, look under 996, and then the Fabspeed exhaust, it showed a stock run of 218.2 hp, and then 234.7 ftlbs after the exhaust. (Awfully low, must be a weird dyno). This would be a 16.5 hp gain and 8.7 ftlbs of torque. But in their adertisement, they claim 8-12 hp gain with 10 ftlbs of torque. I believe the 8-12 to be right. I also have the Fabspeed intake and JVT headers. Since I never did a base line run, I assumed 252 factory hp with 218 ftlbs of torque at the wheels. My results were 10.9 hp and 15.5 ftlbs of torque at the wheels. But then again, dyno's are different. I WISHED I had done a factory run long before my mods to know the true gains. Remember this is peak horspower and torque gains. There could be higher or less gains thru the curve. I'll let you know what fabspeed says.
  8. IFLYASA
    I talked the dyno operator about temperature. Here was his reply. " The dyno used the SAE correction which corrects to STP, standard temperature and pressure. Standard temp is 70F. I don't know the pressure. Even with the correction factor, cars will usually make a little more power in cold weather." FYI
  9. IFLYASA
    The operator was on his computer doing his thing. I know after two runs after driving an hour in the heat, the numbers were consistently 7HP lower. After it sat for 15 minutes with fans blowing on the engine, and radiators up front, that's when I got the better result. Well that sounds about right. 262.9hp vs 252hp, and 233.5 torque vs 218. Headers, Fabspeed exhaust, and Fabspeed intake is probably the difference. Anyone know why the drop of HP around 5300 RPM, and the spike back up at shortly after? The 993 stock dyno I saw pretty much did the same thing at a different RPM.
  10. IFLYASA
    Well I did my first dyno today. I have a 99 model C2 911 with 42,500 miles. I have done 3 mods. I have the fabspeed intake, fabspeed exhaust, and JVT headers. I drove about an hour to the dyno shop so naturally the porsche was hot. The best of my first two runs were 256.0HP at the wheels, with 222.3 ftlbs of torque. After letting the engine cool down with some fans, I did a third test. This yielded 262.9HP at the wheels and 233.5 ftlbs of torque. The temperature was just over 80 degrees. Now assuming a standard day of 58 degrees, I'm sure the results would have been higher. Anyway, I was trying to caculcate the HP at the crank. I hear 15% loss is par. I did not have any stock 996's to compare with on this exact dynojet. So I looked at 2 graphs of 2 stock 1997 993's that were tested on the paticular dyno. They were both right at 236 HP at the wheels. A stock 993 produces 282HP at the crank. This yields at 17% efficiency drop on this dynojet. Using this for my car, gives me roughly 317 HP at the crank , and 281 ftlbs of torque, at 80 degrees outside temp. Using 15% efficiency drop would yield 309.5 HP at the crank, and 275 ftlbs of torque. In summary my HP over the stock numbers was around 13.5 to 21 HP peak gain, and 19 to 25 ftlbs peak torque gain. I'm curious what the numbers would be with a 20 degree temp drop. I may go back in early winter and retry. Here is a graph of the dyno:
  11. IFLYASA
    I have a 99 C2 911. My current mods are the Fabspeed intake system, Fabspeed exhaust, and JVT Racing headers. I hope to head to the dyno in a few days. Does anyone have a stock 996 dyno graph? Also, what is the conversion factor from wheel horsepower/torque to the crank horsepower/torque? I'll post the results with these mods. Since I never did a dyno while bone stock, I"m not sure what to compare it to. That's why I need a stock dyno. Also, can I put spacers on my 18" turbo twist wheels to have a wider look? If so, where can I find these? Thanks.
  12. IFLYASA
    5. "Spacers, 17mm rear and 7mm fronts ("wider is better", and looks a lot better)" Where do you get these spacers? So I take it, they can be used to space the 18" turbo twist wheels? Thanks
  13. IFLYASA
    More corrosive than gasoline and all the additives in it? Aceton burns very cleanly just like propane. Supposedly, fuel systems are designed to withstand any corrosive materials..
  14. IFLYASA
    I've been reading about adding acetone to your gas helps vaporize the gas more efficiently. Supposed 2-3 oz's per 10 gallons does wonders. Supposedly there aren't any side effects, and it also reduces hydrocarbons. I wonder if anyone has done this before. I'll try this in my Nissan truck before giving the 911 a dose.. Here is a great article.. http://www.pureenergysystems.com/news/2005...900069_Acetone/
  15. IFLYASA
    Does anyone know the piping size on stock headers? Thanks
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