Tell me if my math is wrong
08-30-2002, 10:58 PM
#21
Burning Brakes
Member Since: Jul 2000
Location: melbourne,Australia
Posts: 963
Likes: 0
Received 0 Likes
on
0 Posts
Re: Tell me if my math is wrong (BSeery)
True indeed,but if it is a 3.08 the math is way out...the numbers i did in my post are with a 3.08 and measured tire size......also,there is no reason to doubt that Mr.Ddawg's vette hasn't had a diff change in the last 20 years...there is a great section in Chevy Hiperformance with all the relevant formulae.....the only other poss explanation would be if his tires were SUBSTANTIALLY less diameter than 27.1"(standard size)...my guess is that if the tires are standard,the diff is 3.55....if Ddawg gives us his tire size and rpm at indicated speed and gear,then it is simple to bactrack and calculate the diff ratio assuming the speedo is accurate.....if there has been a diff change & the speedo drive hasnt been adjusted then the numbers will be way out.....my guess is that is what has happened...john :chevy ;)
08-31-2002, 04:10 AM
#22
Racer
Member Since: Apr 2000
Location: Kristiansand
Posts: 499
Likes: 0
Received 0 Likes
on
0 Posts
Re: Tell me if my math is wrong (Desertdawg)
To my knowledge the 82 has a 2.87 rear.
At 4400rpm in 4th gear, your speed would be around 175mph....:eek:
At 2300rpm it should have been around 90mph.....
If you were in 3rd, it should have been around 65 and 120mph, at least this is closer to your results
There is, as you pointed out, a large non-linearity between your measurements.
Most probably your tach/speedometer is way out of calibration.
Or you have a converter and/or lockup problem
To test the lockup, hit the brakes while engine is under load in 4th gear (going uphill) and see if the rpm increase.
If not, your lockup isn't working.
[Modified by Ingar, Norway, 9:11 AM 8/31/2002]
At 4400rpm in 4th gear, your speed would be around 175mph....:eek:
At 2300rpm it should have been around 90mph.....
If you were in 3rd, it should have been around 65 and 120mph, at least this is closer to your results
There is, as you pointed out, a large non-linearity between your measurements.
Most probably your tach/speedometer is way out of calibration.
Or you have a converter and/or lockup problem
To test the lockup, hit the brakes while engine is under load in 4th gear (going uphill) and see if the rpm increase.
If not, your lockup isn't working.
[Modified by Ingar, Norway, 9:11 AM 8/31/2002]
08-31-2002, 04:32 AM
#23
Race Director
Thread Starter
Member Since: Jun 2001
Location: The Only Corvette in Gila Bend, Az.
Posts: 16,483
Likes: 0
Received 1 Like
on
1 Post
St. Jude Donor '09
Re: Tell me if my math is wrong (Ingar, Norway)
It looks like I'm going to need to find out what gear ratio I have...
And to think, I thought this was going to be an easy post...
Why-Oh-Why couldn't everybody just reply with COOL!!! and WOW :eek: ,
or maybe even a Dayum :smash:
And to think, I thought this was going to be an easy post...
Why-Oh-Why couldn't everybody just reply with COOL!!! and WOW :eek: ,
or maybe even a Dayum :smash:
08-31-2002, 10:09 PM
#24
Omega Aficianado
Re: Tell me if my math is wrong (Ingar, Norway)
To my knowledge the 82 has a 2.87 rear.
At 4400rpm in 4th gear, your speed would be around 175mph....:eek:
At 2300rpm it should have been around 90mph.....
If you were in 3rd, it should have been around 65 and 120mph, at least this is closer to your results
There is, as you pointed out, a large non-linearity between your measurements.
Most probably your tach/speedometer is way out of calibration.
Or you have a converter and/or lockup problem
To test the lockup, hit the brakes while engine is under load in 4th gear (going uphill) and see if the rpm increase.
If not, your lockup isn't working.
[Modified by Ingar, Norway, 9:11 AM 8/31/2002]
At 4400rpm in 4th gear, your speed would be around 175mph....:eek:
At 2300rpm it should have been around 90mph.....
If you were in 3rd, it should have been around 65 and 120mph, at least this is closer to your results
There is, as you pointed out, a large non-linearity between your measurements.
Most probably your tach/speedometer is way out of calibration.
Or you have a converter and/or lockup problem
To test the lockup, hit the brakes while engine is under load in 4th gear (going uphill) and see if the rpm increase.
If not, your lockup isn't working.
[Modified by Ingar, Norway, 9:11 AM 8/31/2002]
2.87:1 :yesnod: :yesnod: http://www.corvetteactioncenter.com/specs/1982.html