2.77's Vs 3.42's
10-09-2005, 08:39 PM
#1
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Car: ws6
Engine: ls1
Transmission: m6
Axle/Gears: 3.42
2.77's Vs 3.42's
My car came stock with 2.77's. With the 2.77's I ran 13.9@97. After I droped in the 3.42's I got a 13.5@99. Only good for 4 tenths of a second? I was planning on better times not sure what happened.........
10-10-2005, 09:19 AM
#3
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Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Only 4 tenths of a second? So you're beating your old car by what, 4-5 car lengths?
Seems near about the usual improvement for that gear change.
What were you expecting?
Seems near about the usual improvement for that gear change.
What were you expecting?
10-10-2005, 10:00 AM
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Car: ws6
Engine: ls1
Transmission: m6
Axle/Gears: 3.42
Yes the 2.77's were posi. I thought that it would make a bigger difference. Maybe beacuse the new 3.42's spin more. hmm I thought it was a below average gain but I guess not from what people are saying.
10-10-2005, 10:03 AM
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Car: ws6
Engine: ls1
Transmission: m6
Axle/Gears: 3.42
Originally posted by TunedPort 335
I'll be happy if i drop .4 tenths when i put my 3.42s in
I'll be happy if i drop .4 tenths when i put my 3.42s in
10-10-2005, 10:05 AM
#7
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Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
.4 is HUGE. That's like about as much gain as you'd get from about 40 more ft-lbs & HP, or losing about 10% of your car's weight, in the ET range you're in.
What were you expecting? I mean, it's only gears, after all.
What were you expecting? I mean, it's only gears, after all.
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10-10-2005, 10:11 AM
#8
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Car: ws6
Engine: ls1
Transmission: m6
Axle/Gears: 3.42
I talked to this guy at a performance shop who said it should shave almost a full second off your 1/4. I would expect he knows what hes talking about? I guess it was either 
or he was just a moron cause it was no where near that. Oh well I guess it was a good gain after all from what everyones saying.
or he was just a moron cause it was no where near that. Oh well I guess it was a good gain after all from what everyones saying.
10-10-2005, 10:28 AM
#9
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Car: 1988 Corvette
Engine: 5.7L TPI L98
Transmission: 700R4
Axle/Gears: D36 2:59
4 tenths thats really pretty damn good. just move on to you're next mods. the guy at the preformance shop to say the least must have been smoking the good stuff.
10-10-2005, 10:45 AM
#11
He may not have been aware of the TPI motors characteristics. A lot of high performance motors make most of their power from 4000 rpm to 6500 rpm. That even includes the LS1s. The old school motors like the one I have now like to get to the 4000 rpm range and stay above that all the way down the track. May be even higher than that. So if you take a carbed car with a big cam and go from 2.77 to 3.43 you probably will see a second difference.
But think about it, you gained 2 mph from a freaking gear change. Find a horsepower calculator that goes by trap speed and see how much of a difference that is. Probably 20 hp and you didn't even directly add horsepower.
But think about it, you gained 2 mph from a freaking gear change. Find a horsepower calculator that goes by trap speed and see how much of a difference that is. Probably 20 hp and you didn't even directly add horsepower.
10-10-2005, 10:49 AM
#12
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Car: ws6
Engine: ls1
Transmission: m6
Axle/Gears: 3.42
There could have been other factors such as weather I think it was a little cooler out than the last time I went. That can make a difference....Not sure how I gained the 2mph
Maybe drove better as well who knows....
Maybe drove better as well who knows....
10-10-2005, 01:40 PM
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Car: '89 Firebird Formula
Engine: 305 TBI
Transmission: T5
Originally posted by 89IrocZ350TPI
Yes the 2.77's were posi. I thought that it would make a bigger difference. Maybe beacuse the new 3.42's spin more. hmm I thought it was a below average gain but I guess not from what people are saying.
Yes the 2.77's were posi. I thought that it would make a bigger difference. Maybe beacuse the new 3.42's spin more. hmm I thought it was a below average gain but I guess not from what people are saying.
10-11-2005, 08:32 AM
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Car: 1987 Camaro Z28
Engine: 335 TPI Stroker
Transmission: Tremec TKO 500
Axle/Gears: 10 bolt / 3.42
Originally posted by 89IrocZ350TPI
Hey TunedPort 335 we live in the same area
Hey TunedPort 335 we live in the same area
10-14-2005, 02:43 AM
#17
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What was your 60 ft times for each rear end? Maybe you got a slightly better 60 with 2.77 gears, but because of the extra spinning of the 3.42s, you got a slightly slower 60ft.
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