Dyno chart
10-20-2003, 01:57 PM
#1
Burning Brakes
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Dyno chart
Several of you were interested in the dyno chart from the tuning work done by Turbo Performance Center. The chart is attached.
Karl
Karl
10-20-2003, 06:17 PM
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Originally posted by watt
karl,
i'm confused, wasnt peak power to be 381 Hp? is this rear wheel HP? am i missing something? thanks
karl,
i'm confused, wasnt peak power to be 381 Hp? is this rear wheel HP? am i missing something? thanks
10-20-2003, 06:31 PM
#5
Burning Brakes
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Jack is correct. Red is the stock baseline and the HP is measured at the rear wheels. Notice that I gave up a little midrange to get more peak HP but you have to rev the engine high to get it. I'm going to drive it this way for a while and then decide which profile I like better. The throttle response is improved in either case.
Karl
Karl
10-20-2003, 06:34 PM
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Karl , Do you know what Mike did in software to improve throttle response.
Also , can you confirm that mid range was indeed fattened up and exactly where in rpm range you actually feel the biggest improvemant.
tks
MM
Also , can you confirm that mid range was indeed fattened up and exactly where in rpm range you actually feel the biggest improvemant.
tks
MM
10-21-2003, 07:00 AM
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Rather than work on hte peak HP figure, I would be trying to find out why TQ (and therefore HP) dip at 6000 and again at 7000.
The curve looks quite different to the factory curve on the porsche web site.
The curve looks quite different to the factory curve on the porsche web site.
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10-21-2003, 12:01 PM
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On the contrary johnfm, look more carefully. Karl's curve shape looks nearly identical to Porsche's published curve. I am surprised that they are as close as they are. The torque peaks at 5k and 6.5k and the dip at 6k match closely. In absolute values Porsche's curves seem to be conservative, especially at lower RPMs:
RPM, Porsche HP, Karl HP
3k, 140, 130
4k, 180, 180
5k, 270, 260
6k, 290, 280
7k, 370, 340
8k, 370, 340
Congrats, Karl, it looks like you've got yourself a strong one.
RPM, Porsche HP, Karl HP
3k, 140, 130
4k, 180, 180
5k, 270, 260
6k, 290, 280
7k, 370, 340
8k, 370, 340
Congrats, Karl, it looks like you've got yourself a strong one.
10-21-2003, 01:19 PM
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Mike
agree that the dips all happen at the same place - I'm just surprised at the on an engine with variable valve timing and track pedigree - but then I'm no engine builder!!!
The RWHP figures seem high - even baseline of 358 RWHP 'equates' to over 415 FWHP. Even if you assume losses of just 12% you get 406 FWHP. I suppose the only usable info from th plot is the changes between run 1 and run2 - same dyno, same day + 10 RWHP!
agree that the dips all happen at the same place - I'm just surprised at the on an engine with variable valve timing and track pedigree - but then I'm no engine builder!!!
The RWHP figures seem high - even baseline of 358 RWHP 'equates' to over 415 FWHP. Even if you assume losses of just 12% you get 406 FWHP. I suppose the only usable info from th plot is the changes between run 1 and run2 - same dyno, same day + 10 RWHP!
10-21-2003, 05:18 PM
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johnfm: Reading the press articles from the '04 GT3 intro you see several mention that Porsche's 381HP number was on the low side and the factory engineers implied the number was closer to 400HP. Given the ±5% tolerance that Porsche is allowed by German law (or so I think I've read) the 381HP baseline works out to 400HP on the high side so Karl's dyno run lends credence to that rumor.
10-21-2003, 08:23 PM
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Originally posted by watt
karl,
is this repeatable for us? could we ship them the brain?
how noticeable is the change and how much $$$? thanks
karl,
is this repeatable for us? could we ship them the brain?
how noticeable is the change and how much $$$? thanks
Frankly, I doubt you can feel the HP difference on the street. Maybe on the track, where you are head to head with a stock car, you will pull them a little in the upper rpm. The main difference for me was the improved throttle response in the 3000-4500 range.
I don't know what TPC is charging for this upgrade but I think it will be competitive with what other tuners charge for chip upgrades.
Karl
10-23-2003, 09:00 PM
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Trying to understand this dyno graph. Does this mean that the 2004 GT3 might be actually putting out closer to 400 hp? This would make more sense because of all the improvements they made over the Gen I car. Getting only 20hp over the Gen 1 car didn't impress me that much. OTOH why would you not want to advertise that magical 400hp number if you can back it up. I know Porsche is usually conservative when advertising HP/torque figures. I would think that they would want to surpass or at least match the 360 Modena. In any case I can't wait for my car to arrive.
10-23-2003, 10:18 PM
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Originally posted by Riz
Trying to understand this dyno graph. Does this mean that the 2004 GT3 might be actually putting out closer to 400 hp?
Trying to understand this dyno graph. Does this mean that the 2004 GT3 might be actually putting out closer to 400 hp?
YMMVKarl
