Did I get slower?
Melting Slicks
Joined: May 2006
Posts: 2,891
Likes: 1
From: NJ..."the way I saw it, everyone takes a beating sometimes."
I though I would throw a wrench into this thing,
2006 C6 M6 3:42 375RWHP 355RWTQ ran best 12.5
2007 C6 M6 3:90 475RWHP 440RWTQ ran best 11.90
2001 996TT M6 AWD 507AWHP 550 AWTQ ran best 11.40
All on street tires and same days for the most part.
Yet repeatedly none of these can pull away from another during a roll on from 25 MPH to 100 MPH.
2006 C6 M6 3:42 375RWHP 355RWTQ ran best 12.5
2007 C6 M6 3:90 475RWHP 440RWTQ ran best 11.90
2001 996TT M6 AWD 507AWHP 550 AWTQ ran best 11.40
All on street tires and same days for the most part.
Yet repeatedly none of these can pull away from another during a roll on from 25 MPH to 100 MPH.
As far as the other two, I think a roll on race from 25-100mph wont give much of an accurate account of the gears effects. At 25mph both should be in 1st gear. We don't know how fair the start is, if one gets a jump early or whatever, how well they're shifting, etc. The 12.5 car probably has a trap between 113-118mph while the 11.9 car can trap anywhere from 118-130mph. Shutting down at 100mph doesn't tell much to the capabilities of the car. I know you're not saying that the 3.90 gears negated it's 100rwhp advantage.....?
Race Director
Joined: Oct 1999
Posts: 13,298
Likes: 14
From: Somers NY
I disagree.... if the speedo is set for 2.73 and you change the rear end to 4.11 the speedo HAS to be reading wrong.. I HAD to use a Hypertek to adjust the speedometer in my 96 when I went from 3.08 to 3.73...
You HAVE to adjust the speedo if you change rear gears or overall tire height,, example from 26 to 28 tires..
Look at some of the on line calculators that tell you about adjusting if you change rear gear ratio...
Melting Slicks
Joined: May 2006
Posts: 2,891
Likes: 1
From: NJ..."the way I saw it, everyone takes a beating sometimes."
I disagree.... if the speedo is set for 2.73 and you change the rear end to 4.11 the speedo HAS to be reading wrong.. I HAD to use a Hypertek to adjust the speedometer in my 96 when I went from 3.08 to 3.73...
You HAVE to adjust the speedo if you change rear gears or overall tire height,, example from 26 to 28 tires..
Look at some of the on line calculators that tell you about adjusting if you change rear gear ratio...
You HAVE to adjust the speedo if you change rear gears or overall tire height,, example from 26 to 28 tires..
Look at some of the on line calculators that tell you about adjusting if you change rear gear ratio...
Race Director
Joined: Oct 1999
Posts: 13,298
Likes: 14
From: Somers NY
Will someone who KNOWS FOR SURE PLEASE JUMP IN HERE
If need be I'll E mail a company that sells Ring & pinion gears, and ask if I switch from 2.73 to 4.11 will I have to re-calibrate my speedo, & I'll bet the house they say YES...
PLEASE SOMEONE WHO KNOWS FOR SURE JUMP IN!!!
Pro
Joined: May 2007
Posts: 585
Likes: 0
From: Ocean County NJ
We're going to have to agree to disagree.. unless someone who is more up in this than us.. I'm still saying if you change the rear gear ratio, you HAVE to re-calibrate the speedo..
Will someone who KNOWS FOR SURE PLEASE JUMP IN HERE
If need be I'll E mail a company that sells Ring & pinion gears, and ask if I switch from 2.73 to 4.11 will I have to re-calibrate my speedo, & I'll bet the house they say YES...
PLEASE SOMEONE WHO KNOWS FOR SURE JUMP IN!!!
Will someone who KNOWS FOR SURE PLEASE JUMP IN HERE
If need be I'll E mail a company that sells Ring & pinion gears, and ask if I switch from 2.73 to 4.11 will I have to re-calibrate my speedo, & I'll bet the house they say YES...
PLEASE SOMEONE WHO KNOWS FOR SURE JUMP IN!!!
Each time I was told the same thing - you need 270 electoral votes to become president. Sorry, I digress.
The answer is NO NEED to recalibrate. Why, I don't friggen recall but the answer is NO.
Now, where can I pick up the title to your house because you lose..........
Last edited by 07 Z51; Nov 4, 2008 at 10:31 PM. Reason: I am tired and can't type for $hit through blood shot eyes
Melting Slicks
Joined: May 2006
Posts: 2,891
Likes: 1
From: NJ..."the way I saw it, everyone takes a beating sometimes."
We're going to have to agree to disagree.. unless someone who is more up in this than us.. I'm still saying if you change the rear gear ratio, you HAVE to re-calibrate the speedo..
Will someone who KNOWS FOR SURE PLEASE JUMP IN HERE
If need be I'll E mail a company that sells Ring & pinion gears, and ask if I switch from 2.73 to 4.11 will I have to re-calibrate my speedo, & I'll bet the house they say YES...
PLEASE SOMEONE WHO KNOWS FOR SURE JUMP IN!!!
Will someone who KNOWS FOR SURE PLEASE JUMP IN HERE
If need be I'll E mail a company that sells Ring & pinion gears, and ask if I switch from 2.73 to 4.11 will I have to re-calibrate my speedo, & I'll bet the house they say YES...
PLEASE SOMEONE WHO KNOWS FOR SURE JUMP IN!!!
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Race Director
Joined: Oct 1999
Posts: 13,298
Likes: 14
From: Somers NY
Well don't bet your house just yet. What they tell you may not be correct for the C6. In our beloved C6, and the C5 I believe, the speed sensor is in the ring gear of the differential so when you change ring and pinion you are changing the signal to the speed sensor so your speedometer will read correctly. However smaller/larger size tires 1" or more will require a speedo recalibration.
If what you say is true, where did Chevy have the sensor on the 96's when I changed mine from 3.08 to 3.73 the speedo WAS WRONG, and I had to use a Hypertec program to correct it...Did Chevy change the location of the sensor from the C4 & C5 ?
Now I know this is apples & oranges but in my 87 Mustang, when I changed rears I had to change a small gear in the side of the transmission...
Burning Brakes
Joined: Jan 2008
Posts: 905
Likes: 0
From: BURTON MI
Like kobun stated in the C 6's and he believes the C5's ..........................The 96's are old technoligy and the mustang isn't a Corvette..
Last edited by BOB EAGAN; Nov 4, 2008 at 11:37 PM.
Race Director
Joined: Oct 1999
Posts: 13,298
Likes: 14
From: Somers NY
I'll take your word for it.... I gotta admit this is the first time I've ever heard of changing rear gears and not having to correct the speedo...
Race Director
Joined: Feb 2006
Posts: 11,733
Likes: 15
From: SC
Here's my take after having 4.10's in the car for about 8 months. Should've put that money towards H/C.
Went to the track once with stock gears and once with 4.10's. The stock gear runs were ALL faster in ET, I lost 2mph in the 1/8 mile but gained it back and added 2-3mph by the end of the 1/4 mile. Launches were done on the stock runflats and ranged from 2.0-2.2's for both trips. I think I lost time in the quick 1st-2nd shift.
The car "feels" faster on the street but my limited time at the strip shows otherwise. Honestly there are times I want to revert back to 3.42's.
Haha, so if anyone out there wants to swap rears let me know!
Went to the track once with stock gears and once with 4.10's. The stock gear runs were ALL faster in ET, I lost 2mph in the 1/8 mile but gained it back and added 2-3mph by the end of the 1/4 mile. Launches were done on the stock runflats and ranged from 2.0-2.2's for both trips. I think I lost time in the quick 1st-2nd shift.
The car "feels" faster on the street but my limited time at the strip shows otherwise. Honestly there are times I want to revert back to 3.42's.
Haha, so if anyone out there wants to swap rears let me know!
Thread Starter
Pro
Joined: Aug 2007
Posts: 696
Likes: 133
From: Central Jersey
Here's my take after having 4.10's in the car for about 8 months. Should've put that money towards H/C.
Went to the track once with stock gears and once with 4.10's. The stock gear runs were ALL faster in ET, I lost 2mph in the 1/8 mile but gained it back and added 2-3mph by the end of the 1/4 mile. Launches were done on the stock runflats and ranged from 2.0-2.2's for both trips. I think I lost time in the quick 1st-2nd shift.
The car "feels" faster on the street but my limited time at the strip shows otherwise. Honestly there are times I want to revert back to 3.42's.
Haha, so if anyone out there wants to swap rears let me know!
Went to the track once with stock gears and once with 4.10's. The stock gear runs were ALL faster in ET, I lost 2mph in the 1/8 mile but gained it back and added 2-3mph by the end of the 1/4 mile. Launches were done on the stock runflats and ranged from 2.0-2.2's for both trips. I think I lost time in the quick 1st-2nd shift.
The car "feels" faster on the street but my limited time at the strip shows otherwise. Honestly there are times I want to revert back to 3.42's.
Haha, so if anyone out there wants to swap rears let me know!
Melting Slicks
Joined: May 2006
Posts: 2,891
Likes: 1
From: NJ..."the way I saw it, everyone takes a beating sometimes."
If what you say is true, where did Chevy have the sensor on the 96's when I changed mine from 3.08 to 3.73 the speedo WAS WRONG, and I had to use a Hypertec program to correct it...Did Chevy change the location of the sensor from the C4 & C5 ?
Now I know this is apples & oranges but in my 87 Mustang, when I changed rears I had to change a small gear in the side of the transmission...
Now I know this is apples & oranges but in my 87 Mustang, when I changed rears I had to change a small gear in the side of the transmission...
Le Mans Master
Joined: Aug 2004
Posts: 5,259
Likes: 16
From: Monroe Township New Jersey
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
St. Jude donor in memory of jpee '14
Speedo Correction
If you have a Stick = NO CHANGE
If you have an Auto = CHANGE
You can check these items in HP tuners. There are different values for the auto trans vs manual trans. (I am too lazy look and post a copy of the HPT screen). If I recall correctly tire size (26.16) gear ratio (1) and VSS error are the same for both transmissions.
Once you change gears and/or the torque converter in a auto you have to change several values in the speedo pull down screen.
If you have a Stick = NO CHANGE
If you have an Auto = CHANGE
You can check these items in HP tuners. There are different values for the auto trans vs manual trans. (I am too lazy look and post a copy of the HPT screen). If I recall correctly tire size (26.16) gear ratio (1) and VSS error are the same for both transmissions.
Once you change gears and/or the torque converter in a auto you have to change several values in the speedo pull down screen.
Melting Slicks
Joined: May 2006
Posts: 2,891
Likes: 1
From: NJ..."the way I saw it, everyone takes a beating sometimes."
Speedo Correction
If you have a Stick = NO CHANGE
If you have an Auto = CHANGE
You can check these items in HP tuners. There are different values for the auto trans vs manual trans. (I am too lazy look and post a copy of the HPT screen). If I recall correctly tire size (26.16) gear ratio (1) and VSS error are the same for both transmissions.
Once you change gears and/or the torque converter in a auto you have to change several values in the speedo pull down screen.
If you have a Stick = NO CHANGE
If you have an Auto = CHANGE
You can check these items in HP tuners. There are different values for the auto trans vs manual trans. (I am too lazy look and post a copy of the HPT screen). If I recall correctly tire size (26.16) gear ratio (1) and VSS error are the same for both transmissions.
Once you change gears and/or the torque converter in a auto you have to change several values in the speedo pull down screen.
Le Mans Master
Joined: Aug 2004
Posts: 5,259
Likes: 16
From: Monroe Township New Jersey
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
St. Jude donor in memory of jpee '14
Thank you, Next time you see Dennis ask him how his speedo works
I understand even with HP tuners the cruise control is still screwed up on the automatics (A4)
Melting Slicks
Joined: May 2006
Posts: 2,891
Likes: 1
From: NJ..."the way I saw it, everyone takes a beating sometimes."