997 GT3 Dyno Results - 9% Over Stated Numbers
10-13-2007, 06:18 PM
#1
Rennlist Member
Thread Starter
997 GT3 Dyno Results - 9% Over Stated Numbers
I saw a new 997 GT3 crank out 384HP to the rear wheels on a DynoJet today. According to my calculations that equates to 452HP at the flywheel ... a 9% swing over the rated number.
Anyone else seeing similar numbers?
Anyone else seeing similar numbers?
10-14-2007, 01:09 AM
#6
Rennlist Member
factory tourguide said every motor for the gt3/turbo is tested to 105% of rated power (minimum) before being assigned a car. I also asked him the upper limit and he said they can't go 10% above so sounds like its somewhere in that range.
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10-14-2007, 04:07 AM
#8
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Also, the motor is actually 425 hp at speed with the ram air effect. But that would not show up on a dyno.
I think that 452 is not accurate and is the result of the dyno reading too high, but I could see it approching 430 hp without the ram air.
10-14-2007, 08:04 AM
#9
- search previous posts but my car dyno'd 380 at the wheels when 3 months old on a Mustang Dyno
- AWE has a similar dyno and they said their mule car was doing 380-385 also
- as all dynos required operater inputs (different inputs depending on the dyno - but things such as weight, hp to sustain a certain mph (of which was not available at the time for the 997gt3 from porsche), etc) I think it is pretty easy to conclude that you are never going to get an exact number unless you engine dyno the car (never mind weather, humidity, fuel, altitude, etc)
- that said, 380 at the wheels + a 10% drive train loss is > than 415 and this is without the 10hp ram air effect so, as state above, 415hp+ 5% is likely the real number including the ram air effect
- AWE has a similar dyno and they said their mule car was doing 380-385 also
- as all dynos required operater inputs (different inputs depending on the dyno - but things such as weight, hp to sustain a certain mph (of which was not available at the time for the 997gt3 from porsche), etc) I think it is pretty easy to conclude that you are never going to get an exact number unless you engine dyno the car (never mind weather, humidity, fuel, altitude, etc)
- that said, 380 at the wheels + a 10% drive train loss is > than 415 and this is without the 10hp ram air effect so, as state above, 415hp+ 5% is likely the real number including the ram air effect
10-15-2007, 12:29 AM
#10
Can you steer me to an authoritative source where I can read more about the ram air effect, at what speed it comes into play and to what extent? Thanks
10-15-2007, 09:50 AM
#11
Burning Brakes
I think my car put out about 326whp on a dynojet. He said he was pushing 8k lb drums (for NASCAR...??) and that's why it reads lower than others.
I still think it's wrong. I think the car's intake/charge was too high and therefore ran a different map. Now that the weather is cooler I may do it again.
I still think it's wrong. I think the car's intake/charge was too high and therefore ran a different map. Now that the weather is cooler I may do it again.
10-15-2007, 10:37 AM
#13
about 2 weeks ago, a poster on rennlist gave a link to a 100pg or so official porsche document about the 997gt3 (also cmparing it to the 996gt3)
it mentions the new ram air intake versus the 996 design but doesn't give the engineering details that you are looking for
10-15-2007, 11:16 AM
#14
Burning Brakes
about 2 weeks ago, a poster on rennlist gave a link to a 100pg or so official porsche document about the 997gt3 (also cmparing it to the 996gt3)
it mentions the new ram air intake versus the 996 design but doesn't give the engineering details that you are looking for
it mentions the new ram air intake versus the 996 design but doesn't give the engineering details that you are looking for
10-15-2007, 01:47 PM
#15
Burning Brakes
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