Does anyone know the top speed of the GXP Coupe? I had it upto 120mph the other day on a freeway in with no other cars around in the desert but didn't want to push my luck risking a a cop seeing me. Shhhh
The stock ECM is programed to retard the timing and limit power at I believe 142 but may be 145. I can't recall but I know it's one of those two. The car will do more if a tune is done that unlocks the preset limit and that top speed will vary by tune type and vehicle.
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I have had mine up to 155mph with police escort. After a car show in Central Florida we had a drive were we got up to 155mph and I had the top down, never do it with the top down again.
Bit of an experience with the top down?
I ran my Sky Redline up on a "closed track" before I had the GMPP tune. And it ran over 150 fairly easy. At the time I was not aware of the speed limiter, but I got out of it before the 155 mark anyway. I did have the top up, and even that got a little loud. But car seemed to track pretty good, considering it isn't exactly the most aerodynamic design of all time.
My old Buick would run 150 very easily, and it liked it. But the car was 1000 pounds heavier, so tended to be pretty stable at high speed. And the windshield was higher in relationship to the driver, so even with the top down, it was not nearly as dramatic as the little Sky.
I've hit over 200mph on my last motorcycle when I went to the Salt Flats. If the ECM is configured at 155mph on my GXP Couple I don't think I'll make the trip there to open it up. Maybe I will do some Autocross instead.
Thanks everyone for the good info.
Short answer, the coupe has a 2.5% CD advantage on the convert.
Converts with the rear wing, about 143 mph (according to a GM engineer) and the coupe 147-148. This will vary with altitude, temperature etc.
NA = 122/123 mph.
I can confirm this with my stock Sky NA... I peaked at only 115MPH with my phat ass on board on a nice stretch of highway when we ran the Ring Around Lake Okeechobee Adventure a few years back... Still had a little more room on the pedal, but with me, I think it peaked at around 115... fast enough if u ask me...
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FWIW, I think GM made the correct choice. Did they go for a slippery shape and thus be able to brag that the cars would be able to exceed the maximum legal speed in the continent by 70 MPH instead of 'only' 60 MPH, or did they live with aerodynamics equivalent to an RV and make it look so good that lots of people would buy it?
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Two weeks ago, I agreed to carry an observer to settle a bet two owners who hang out at my local coffee shop: one is a GXP coupe with an aftermarket cat-back exhaust and a tune but no other mods, the other a Turbo Sky with a catback and claimed sort of cold-air or bigger intercooler intake mods, and a tune. Neither wanted to be burned by having yhe weight of "the witness" (guy holding the bet money) in their car, so i agree to carry the observer.
Both claimed big HP gains over stock and wanted no passenger in their cars to slow them down (despite the fact it probably doesn't matter). One of these folks occassionally hangs out on this forum and can identify himself if he wants to - he's the person who lost.
This wasn't an out and out race - I would not have done it if it was: they ran on a nice safe stretch of US 1 here in central NC, on a dry, quiet Synday morning, and rather got quickly up to top speed. Did not seem to be any difference in acceleration capability. I followed at what I thought was a safe distance with the witness.
We didn't wait for miles and miles to make sure theywere at "top speed." The convertible (top up) seemed to stabilize at 138 or so by my car's speedometer -- if it was accelerating, it was no perceptable. The coupe walked away still accelerating and seemed to stabilize at around 145 or just a bit less. You have to wonder if and what the mods did and if they were well done, but that's what they got.
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Last edited by Lee Willis; 12-14-2010 at 02:02 PM.
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