Another Modified ECU Software
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Sharkey
I am sure you were not day dreaming (though lately you are working too hard I think
) I certainly expect you to pull from a CGT, in fact with the HP difference and aerodyamics you should be about 150feet ahead by 150mph!.. Now go buy a real man's computer please, not one of those trendy Macs! 
I am sure you were not day dreaming (though lately you are working too hard I think
) I certainly expect you to pull from a CGT, in fact with the HP difference and aerodyamics you should be about 150feet ahead by 150mph!.. Now go buy a real man's computer please, not one of those trendy Macs!
Originally Posted by Jean
Sharkey
I am sure you were not day dreaming (though lately you are working too hard I think ) I certainly expect you to pull from a CGT, in fact with the HP difference and aerodyamics you should be about 150feet ahead by 150mph!.. Now go buy a real man's computer please, not one of those trendy Macs!
I am sure you were not day dreaming (though lately you are working too hard I think
) I certainly expect you to pull from a CGT, in fact with the HP difference and aerodyamics you should be about 150feet ahead by 150mph!.. Now go buy a real man's computer please, not one of those trendy Macs! I do love the work though- really I do
It feels a bit like playig with "Lego" to me back when I was a kid. Or more of a kid than I am now. There are so many choices, possibilities and directions to go with these cars (not just power) which keeps things interesting. My only gripe is that the tuner is having more and more control taken away from them with all of these crazy sensors/features tied into the Bosch Motronic going forward. Still that's what people like Garrett, Todd, RS, RuF etc. are for!PS I hate MACs.
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Originally Posted by Jean
Joe
I don't know the right answer. But aerodynamics and heat soak play a MAJOR role the higher the speeds are, as RajTT mentioned.
The numbers that your cars are showing in the quartermile are sick fast, obviously the stock weight 540HP GT2 in question running a 1 Bar of boost and almost 200HP less, is not comparable head to head with your cars, but they can be closer than one could imagine.
In case it is of any interest, I compiled some data for you from the AX22 datalogs of a 996GT2 that runs a more modest engine configuration than yours, but my objective here is only to show the importance of aerodynamics and not compare cars of course.
(From a roll)
60-130mph (Delta of 70mph): 10.28s.
130-190mph (Delta of 60mph): 19.8s.
A speed difference of 70mph covered in 10.3 seconds vs. a difference of 60mph is covered in 19.8s at higher speeds!
Out of interest, that same GT2 covers 130-200mph (70mph difference like a 60-130mph) in 25.3s, which is 6.4 seconds to cover 10mph more at 190mph! That is how important drag and gear ratios are, fascinating stuff.
There is not too much reliable data available for 0-186mph runs out there, I just have a couple of them that are quite fantastic, the performance (torque and HP) really shows later on in the runs, much more than in their 0-100mph times, as a result of softer launches and tire spin (tests done on the street with street tires).
I don't know the right answer. But aerodynamics and heat soak play a MAJOR role the higher the speeds are, as RajTT mentioned.
The numbers that your cars are showing in the quartermile are sick fast, obviously the stock weight 540HP GT2 in question running a 1 Bar of boost and almost 200HP less, is not comparable head to head with your cars, but they can be closer than one could imagine.
In case it is of any interest, I compiled some data for you from the AX22 datalogs of a 996GT2 that runs a more modest engine configuration than yours, but my objective here is only to show the importance of aerodynamics and not compare cars of course.
(From a roll)
60-130mph (Delta of 70mph): 10.28s.
130-190mph (Delta of 60mph): 19.8s.
A speed difference of 70mph covered in 10.3 seconds vs. a difference of 60mph is covered in 19.8s at higher speeds!
Out of interest, that same GT2 covers 130-200mph (70mph difference like a 60-130mph) in 25.3s, which is 6.4 seconds to cover 10mph more at 190mph! That is how important drag and gear ratios are, fascinating stuff.
There is not too much reliable data available for 0-186mph runs out there, I just have a couple of them that are quite fantastic, the performance (torque and HP) really shows later on in the runs, much more than in their 0-100mph times, as a result of softer launches and tire spin (tests done on the street with street tires).
I forget the equation, but there is a formula for top speed that involves cD and horsepower, and I think it says "for every mile an hour over XXXmph, you need 100hp to gain a mile per hour" maybe somebody else has heard of this
Originally Posted by sharkster
10.2 to 124mph is pretty darn fast eh?
Off topic...heheh darnit at 10.7 seconds I was already doing 137mph What speed are you doing after that Jean? I think you posted somewhere.. I need to go back out to the track to see.
Off topic...heheh darnit at 10.7 seconds I was already doing 137mph
What speed are you doing after that Jean? I think you posted somewhere.. I need to go back out to the track to see.
you nut!! Damm, cant wait to start seeing some modded 997tt number's FOR REAL
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Originally Posted by RennTechV12
I forget the equation, but there is a formula for top speed that involves cD and horsepower, and I think it says "for every mile an hour over XXXmph, you need 100hp to gain a mile per hour" maybe somebody else has heard of this
HP = 1/3.p.A. Cd. v^3
where p: density, A:frontal area, Cd: drag coeff.
To a first order, horsepower required scales as the cube of velocity. This equates to roughly 10 extra horsepower required for every additional mph gain. So depending on the other variables, a whopping 100 extra horsepower may be required to increase top speed by a measy 10-12 mph!
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Originally Posted by rajtt
Top speed (v) can be theoretically estimated using:
HP = 1/3.p.A. Cd. v^3
where p: density, A:frontal area, Cd: drag coeff.
To a first order, horsepower required scales as the cube of velocity. This equates to roughly 10 extra horsepower required for every additional mph gain. So depending on the other variables, a whopping 100 extra horsepower may be required to increase top speed by a measy 10-12 mph!
HP = 1/3.p.A. Cd. v^3
where p: density, A:frontal area, Cd: drag coeff.
To a first order, horsepower required scales as the cube of velocity. This equates to roughly 10 extra horsepower required for every additional mph gain. So depending on the other variables, a whopping 100 extra horsepower may be required to increase top speed by a measy 10-12 mph!
I knew it was something like that
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