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Old 12-13-2010, 11:30 AM   #1 (permalink)
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Top Speed

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
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Old 12-13-2010, 12:39 PM   #2 (permalink)
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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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Old 12-13-2010, 01:02 PM   #3 (permalink)
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Thanks Gunny
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Old 12-13-2010, 05:41 PM   #4 (permalink)
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ECM is configured at 155 from what I can tell through HP Tuners. I've been 150 before and backed off.
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Old 12-13-2010, 06:46 PM   #5 (permalink)
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Originally Posted by 08Skyldr View Post
ECM is configured at 155 from what I can tell through HP Tuners. I've been 150 before and backed off.
You are correct, I went back and checked some old threads again and the 147 "actual" is for the 2.4L. GXP is set at 155. Sorry for the mislead Jonny.
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Old 12-14-2010, 02:09 AM   #6 (permalink)
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Ok, since my limiter was removed with the Trifecta Tune, then my N/A should do 147?
I have never driven over 130 in a car, have been 135 on a low rider. Not sure I want the extra 17.
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Old 12-14-2010, 03:11 AM   #7 (permalink)
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Ok, since my limiter was removed with the Trifecta Tune, then my N/A should do 147?
I have never driven over 130 in a car, have been 135 on a low rider. Not sure I want the extra 17.
Lol, no. With out some heavy mod's a 2.4 wont touch 147
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Old 12-14-2010, 07:13 AM   #8 (permalink)
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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.
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Old 12-14-2010, 07:43 AM   #9 (permalink)
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Originally Posted by MeanGXP-R View Post
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.
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Old 12-14-2010, 08:11 AM   #10 (permalink)
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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.
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Old 12-14-2010, 08:13 AM   #11 (permalink)
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The aerodynamics of the Kappa are intentionally poor, but it looks nice!

The coupes will do a few MPH more than the convertibles can manage.

See this thread:

Slippery Coupes?

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.
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Old 12-14-2010, 08:36 AM   #12 (permalink)
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Quote:
Originally Posted by wspohn View Post
The aerodynamics of the Kappa are intentionally poor, but it looks nice!

The coupes will do a few MPH more than the convertibles can manage.

See this thread:

Slippery Coupes?

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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Old 12-14-2010, 08:44 AM   #13 (permalink)
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Quote:
Originally Posted by wspohn View Post
The aerodynamics of the Kappa are intentionally poor, but it looks nice!

The coupes will do a few MPH more than the convertibles can manage.

See this thread:

Slippery Coupes?

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.
This was witnessed by about 30 2006 Solstices in March, 2006. Downhill with the top down.
Attached Thumbnails
Top Speed-marco130.jpg   Top Speed-marco130b.jpg   Top Speed-marco130c.jpg   Top Speed-marco130d.jpg  
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Old 12-14-2010, 08:58 AM   #14 (permalink)
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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?

Duh.....
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Old 12-14-2010, 12:10 PM   #15 (permalink)
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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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