speeed limiter?
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From: Little Neck New yORK
speeed limiter?
is there a speed limiter on the 2002 zo6 corvette.? i can only top out at 153mph approaching 5800rpm in 5th gear, when i dumped 6th gear the car started to slow down. . why? please help. i already used the diablo programmer on the car and the car has all the bolt on's in place.
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From: Newberry FL
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St. Jude Donor '07
Originally Posted by carcrazzy
is there a speed limiter on the 2002 zo6 corvette.? i can only top out at 153mph approaching 5800rpm in 5th gear, when i dumped 6th gear the car started to slow down. . why? please help. i already used the diablo programmer on the car and the car has all the bolt on's in place.
Team Owner
Joined: May 2005
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From: Flagstaff Az.
limiter
The only limiter I know of built into the car is the rev limiter. If you are stock-horse power falls off over 6000rpms and sixth gear is to tall for a stock motor to pull. You can definitly tell when you hit the rev limiter.
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I would think with the stock 3.42's you should be able to pull beyond 153. If you had higher gears, that would reduce your ability to reach a higher top speed, like 3.90's or 4.10's. One way you can tell is when you put the car in 4th gear and hit 70mph - how many rpm's are you turning? If you're turning 4100 rpm - then you have 4.10's. If you are turning 3900 rpm, then you have a 3.90......I think you get the point.
I assume that this top speed run was performed on a closed course, right?
I assume that this top speed run was performed on a closed course, right?
Le Mans Master
Joined: Jul 2003
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From: Maine
Originally Posted by blacksedan87
I would think with the stock 3.42's you should be able to pull beyond 153. If you had higher gears, that would reduce your ability to reach a higher top speed, like 3.90's or 4.10's. One way you can tell is when you put the car in 4th gear and hit 70mph - how many rpm's are you turning? If you're turning 4100 rpm - then you have 4.10's. If you are turning 3900 rpm, then you have a 3.90......I think you get the point.
I assume that this top speed run was performed on a closed course, right?
I assume that this top speed run was performed on a closed course, right?
Team Owner
Joined: Sep 2003
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From: Raleigh / Rolesville NC
MN12 with 3.42s
1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6300 6500
1st 8 12 16 19 23 27 31 35 39 43 47 49 51
2nd 11 17 22 28 34 39 45 50 56 61 67 70 73
3rd 16 24 32 40 49 57 65 73 81 89 97 102 105
4th 23 35 46 58 69 81 93 104 116 127 139 146 150
5th 28 41 55 69 83 96 110 124 138 152 165
6th 41 62 83 103 124 145 165
Wind resistance ( head wind even a small head wind) will slow the car down.
6th gear is a highway cruzing gear and not for top speed.
What size tires are on the back. If your tires are smaller diamerter then stock your speeds will be less.
1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6300 6500
1st 8 12 16 19 23 27 31 35 39 43 47 49 51
2nd 11 17 22 28 34 39 45 50 56 61 67 70 73
3rd 16 24 32 40 49 57 65 73 81 89 97 102 105
4th 23 35 46 58 69 81 93 104 116 127 139 146 150
5th 28 41 55 69 83 96 110 124 138 152 165
6th 41 62 83 103 124 145 165
Wind resistance ( head wind even a small head wind) will slow the car down.
6th gear is a highway cruzing gear and not for top speed.
What size tires are on the back. If your tires are smaller diamerter then stock your speeds will be less.
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Originally Posted by jman1
pretty cool..... i didn't know you could tell like that
http://mikemercury.home.att.net/ratio.htm
And it looks like I mistakenly stated 70mph - it should be 75mph. The key is 3rd with an A4 or 4th with an MN6 or MN12. The idea is to be in the gear that is the one to one ratio.
Last edited by blacksedan87; Mar 2, 2006 at 04:09 PM.
Drifting
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From: Prosper TX
Originally Posted by carcrazzy
is there a speed limiter on the 2002 zo6 corvette.? i can only top out at 153mph approaching 5800rpm in 5th gear, when i dumped 6th gear the car started to slow down. . why? please help. i already used the diablo programmer on the car and the car has all the bolt on's in place.
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A Z06 with stock gearing should be able to do better than 153 in 5th. There is no speed limiter, just limited by drag and power.
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From: Newberry FL
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St. Jude Donor '07
Originally Posted by AU N EGL
MN12 with 3.42s
1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6300 6500
1st 8 12 16 19 23 27 31 35 39 43 47 49 51
2nd 11 17 22 28 34 39 45 50 56 61 67 70 73
3rd 16 24 32 40 49 57 65 73 81 89 97 102 105
4th 23 35 46 58 69 81 93 104 116 127 139 146 150
5th 28 41 55 69 83 96 110 124 138 152 165
6th 41 62 83 103 124 145 165
Wind resistance ( head wind even a small head wind) will slow the car down.
6th gear is a highway cruzing gear and not for top speed.
What size tires are on the back. If your tires are smaller diamerter then stock your speeds will be less.
1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6300 6500
1st 8 12 16 19 23 27 31 35 39 43 47 49 51
2nd 11 17 22 28 34 39 45 50 56 61 67 70 73
3rd 16 24 32 40 49 57 65 73 81 89 97 102 105
4th 23 35 46 58 69 81 93 104 116 127 139 146 150
5th 28 41 55 69 83 96 110 124 138 152 165
6th 41 62 83 103 124 145 165
Wind resistance ( head wind even a small head wind) will slow the car down.
6th gear is a highway cruzing gear and not for top speed.
What size tires are on the back. If your tires are smaller diamerter then stock your speeds will be less.
Very nice post.
Burning Brakes
Joined: Jun 2004
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From: Fox Island Wa
No limiters to my knowledge. Huh... I need to go out and do a top speed run again, now that my body work is done. I know that 130-135 felt more "firm" and "grounded" now then it did before. I wonder if I get any drag after those speeds. I need to change the tow before I atempt a 160+ run any time soon. 
I was able to top out 3 178MPH runs a few years ago. This was on a runway... I ran out of track before speed. 
~MS
I was able to top out 3 178MPH runs a few years ago. This was on a runway... I ran out of track before speed. ~MS
Thread Starter
Instructor
Joined: Sep 2005
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From: Little Neck New yORK
speed limiter
The rpm's at 60mph are at 1500rpm's in 6th gear. as far as were i was able to acheive these speeds there is a great long straight road near jones beach in ny. btw, i forgot to mention i didnt have the 2 front o2 sensors hooked up and i had a 1 bad o2 sim. could this have been the problem? i wil try is again this weekend if the weather permits. i now have all the sensors hooked up and replaced the bad o2 sim. also for some reason with the diablo scanner hooked up the mv at the leaft rear sensor stays at aboubt 440 to 455 not much change in variables like the others. so strange. even at 153mph. it is quite scary. 1 mistake and im toast. and im sure there will be no more replys from me. i will check the gear ratio to be certain. its funny how fast you come up on cars doing 70mph doing over 150mph. someone metioned to me that it might be the clutch slipping, im doubtful because the car burns rubber to third gear. the tires are stock height. any thoughts?
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Joined: Dec 2003
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From: CA
I did 178 mph in my 97 and I am sure that either a fuel cutoff or speed limiter kicked in. The car would of went faster. By the way it was night time, I had those head lights up that are suppose to be a problem for aerodynamics.
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From: ================== Houston, Texas www.englandgreen.com ================== Necessary Evil™ __________
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Originally Posted by Skull One
Technically there is a register in the on board computer that is a top speed limiter. It is set above the stock speed you are capable of in a Z06 due to aero drag. If memory serves it is around 185 +/- 2. Of course I am sure someone will say I am 100% wrong, so take it with a grain of salt until someone can pull up the chart of programmable registers.
Other than that, there is no speed limiter in the C5 Corvette.
Drifting
Joined: Sep 2003
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From: Prosper TX
Originally Posted by EnglandGreen
The technical speed limit is 255 (FF in hexidecimal notation) which is encoded in the PCM.
Other than that, there is no speed limiter in the C5 Corvette.
Other than that, there is no speed limiter in the C5 Corvette.
Interesting. I have heard B7 thru BB being in that slot. Next time I am at 21st Century Muscle Cars I will ask Andy what the default is for my Coupe.