Gears
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Staging Lane
Joined: Jun 2005
Posts: 56
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From: Knoxville Tennessee
Gears How can i find out what gears were stock in my 98 LS1 Z28? I'm sure that the gears in it now aren't stock and I'm not sure how to figure out what I do have now. My speedometer shows 74 mph at 2300 rpm, but when checking on radar I am running 65 mph. Any advise on how to begin...................?
TECH Fanatic
Joined: May 2004
Posts: 1,030
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From: Wichita KS
First off, do you have an auto or a manual? if you have an auto, then I can help, otherwise you can completely disregard this!
well here is how i would figure it out. My car when in overdrive with 3.23's is doing about 2000 rpm at 65 mph. Assuming we have a similar tire size, I think a proportion could prolly help.
my gear set - your gear set
3.23 / 2000 = X / 2300
3.23 * 2300 = X * 2000
X= (3.23 * 2300) / 2000
X= 7429 / 2000
X= 3.7145 ~ 3.73's
Granted its hard to be incredibly accurate with rpm readings and mph so the 3.7145 is off a bit, but my educated estimate is that you are running 3.73's. Man, thats not a bad setup. Bet that helps the ol' acceleration quite a bit
nathan
well here is how i would figure it out. My car when in overdrive with 3.23's is doing about 2000 rpm at 65 mph. Assuming we have a similar tire size, I think a proportion could prolly help.
my gear set - your gear set
3.23 / 2000 = X / 2300
3.23 * 2300 = X * 2000
X= (3.23 * 2300) / 2000
X= 7429 / 2000
X= 3.7145 ~ 3.73's
Granted its hard to be incredibly accurate with rpm readings and mph so the 3.7145 is off a bit, but my educated estimate is that you are running 3.73's. Man, thats not a bad setup. Bet that helps the ol' acceleration quite a bit
nathan
TECH Fanatic
Joined: May 2004
Posts: 1,030
Likes: 0
From: Wichita KS
if his speedo it 10 mph off, then the gears are more than likely not stock, because even a sizeable change in tires would not result in being more than a few mph off one way or the other. Sounds to me like he has higher than stock gears
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When I went from 2.73 to 3.73 in my third gen I was off 10-20+ as speed increased, generally 15-20. 50=35, 82=60(exactly)...check out www.thirdgen.org for calculators.
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11 Second Club
Joined: Jul 2003
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From: loudoun county,va
Originally Posted by natronathon
because even a sizeable change in tires would not result in being more than a few mph off one way or the other.
not true even a little bit.....
go from a stocker to a 28" tire your mph will be way off...