What makes the .2 "S" so freakin' fast?
#46
06-01-2009, 07:41 PM
Join Date: Apr 2004
Location: North Dakota
Posts: 9,541
Rep Power: 502 
This is the chart you just posted for the 997:
Here is an old dyno for my car. I've added a couple things since then but it's good enough for what we're trying to do here.
#47
06-01-2009, 07:45 PM
Join Date: Apr 2004
Location: North Dakota
Posts: 9,541
Rep Power: 502 At 50 mph Dog's engine is at 5,000 rpm which is it's best point in the power curve, making substantially more compression than the 997S. He also has an aftercooler, which, if the pump is running, all but eliminates heat soak. There would have to be a 500+ pound difference between cars for the 997S to have a chance.
Maybe it's time for a smaller pulley?
#48
06-01-2009, 07:47 PM
Registered User
Join Date: Aug 2004
Location: Chicagoland
Posts: 2,134
Rep Power: 122
5 psi is way to conservative for that engine. Shoot for at least 6.
#49
06-01-2009, 07:50 PM
Join Date: Apr 2004
Location: North Dakota
Posts: 9,541
Rep Power: 502
Doesn't 352 rear wheel HP sound a little high for a car that is supposed to have 385 crank hp? Knocking off 15% for the driveline, shouldn't it be in the neighborhood of 325ish? Especially on a mustang dyno which we all know are notorious for reading low.
#50
06-01-2009, 07:51 PM
Join Date: Apr 2004
Location: North Dakota
Posts: 9,541
Rep Power: 502
Can I be nosy and ask how much you're running?
#51
06-01-2009, 07:52 PM
Your dyno is definitely better than the other. More area under the curve, better peak power. Different dynos, different days...etc.
I think you must have been pulling timing (due to heat, fuel, whatever..). If you were actually making that much power on that day, the 997S really shouldn't have been able to keep up.
I think you must have been pulling timing (due to heat, fuel, whatever..). If you were actually making that much power on that day, the 997S really shouldn't have been able to keep up.
#52
06-01-2009, 07:58 PM
Probably...but I'm assuming the car is truly under-rated. At least it seems to be based off of the videos I've seen of it racing other cars. It's surprisingly fast:
http://www.youtube.com/user/m5boardd...37/R5BVmaU-Vvo
http://www.youtube.com/user/m5boardd...48/Uzm639IcWnE
http://www.youtube.com/user/m5boardd...14/33BHlQHlkFE
http://www.youtube.com/user/m5boardd...15/qPJfDCaVlHQ
Last edited by Divexxtreme; 06-01-2009 at 08:01 PM.
#53
06-01-2009, 08:00 PM
Join Date: Apr 2004
Location: North Dakota
Posts: 9,541
Rep Power: 502 Your dyno is definitely better than the other. More area under the curve, better peak power. Different dynos, different days...etc.
I think you must have been pulling timing (due to heat, fuel, whatever..). If you were actually making that much power on that day, the 997S really shouldn't have been able to keep up.
I think you must have been pulling timing (due to heat, fuel, whatever..). If you were actually making that much power on that day, the 997S really shouldn't have been able to keep up.
#54
06-01-2009, 08:42 PM
Let me know and we can do a run. Lots of open space down here of HWY 41 south of Apollo Beach where I am....long straight deserted roads.
#55
06-01-2009, 09:01 PM
Almost a 80lb savings from the seats alone.
#56
06-01-2009, 09:01 PM
Yeah, I would recommend doing another dyno session and seeing if anything has changed. As for our race itself, I can see where the possibility of us staying even in a race is. I mean, if your car is 400+ pounds, and my gearing is more aggressive, and perfectly fitted to my powerband, then its perfectly possible for a even race outcome.
Or it could just come down to driver skill....
I would love to tag along if you guys do some runs. Really curious about the outcome of a PDK vs. a 6 speed race since our cars are the same model
Or it could just come down to driver skill....
I would love to tag along if you guys do some runs. Really curious about the outcome of a PDK vs. a 6 speed race since our cars are the same model
#57
06-01-2009, 09:08 PM
Are the GT3 club seats the same as the carbon / glass composite back sport bucket seats you can get in the C4S, if not, how are they different? Looks like I may need to change my order around a little.
#58
06-01-2009, 10:50 PM
The ones I have are a euro seat, no side airbags, no recline or tilt, no motors... They are leather though.
#59
06-01-2009, 10:57 PM
So assuming the added functions of the US models add up to 10lbs total, that's still a pretty good savings. I remember reading that the dynamic headlights were also rather hefty.
#60
06-02-2009, 07:27 AM
Join Date: Apr 2004
Location: North Dakota
Posts: 9,541
Rep Power: 502
I've recently done the GT3 seats and the rear muffler delete. That's a pretty good chunk of weight off. However, I added the roll bar so it probably put me back where I started from.