c4 torque?
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Joined: Sep 2005
Posts: 69
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From: Taylorsville UT
The torque your engine puts out will remain the same regardless of your rear end ratio. Your engine should put out 330ft/lbs of torque I believe.
**Just looked it up, Vader is correct, it's 340ft/lbs of torque.**
**Just looked it up, Vader is correct, it's 340ft/lbs of torque.**
Last edited by aug1516; May 2, 2006 at 10:32 AM.
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From: Athens AL
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Originally Posted by aug1516
The torque your engine puts out will remain the same regardless of your rear end ratio. Your engine should put out 330ft/lbs of torque I believe.
Last edited by vader86; May 2, 2006 at 10:35 AM.
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Instructor
Joined: Mar 2005
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From: Thornton CO
Originally Posted by clf93lt1
92 was 330 93 thru 96 340
That is correct.I believe this to be an artifact of a change in cams from 92 to 93.
This taken from CAC:
Last edited by stearnman; May 2, 2006 at 05:26 PM.
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340 is what the little plaque on my console says. And yes I know that those plaques aren't factory. And I also know that it's not even close to accurate anymore. 
Safety Car
Joined: Sep 2000
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From: Hinckley Ohio
Originally Posted by buttjam
what would be the rated torque of a 95 c4, I believe my car has a 3:45 rear end. I wanted to calculate what I would have if I change my ratio.
but it will change the torque at the rear wheels.....the change in torque will be in the same ratio as the change in gear ratios...
for example 4.10/3.45=1.18841.........so in first gear you put down approximately 18.8% more torque to the ground......
You can do the same evaluation for any other gear ratio....
Race Director
Joined: Dec 2002
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From: SCMR Rat Pack'r Charter Member..Great Bend KS
Originally Posted by LT4BUD
As stated my others gears will not change the torque at the motor....
but it will change the torque at the rear wheels.....the change in torque will be in the same ratio as the change in gear ratios...:
but it will change the torque at the rear wheels.....the change in torque will be in the same ratio as the change in gear ratios...:
Larry
code5coupe
Racer
Joined: Apr 2004
Posts: 487
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From: Huntsville AL
Is the calculation the same for hp? I'd like to be able to compare dyno charts of my car with factory gearing to one with 4.10 gears. Also, can these adjustments be made on the dyno so the chart reads correct?
Safety Car
Joined: Sep 2000
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From: Hinckley Ohio
Originally Posted by Wildcat1
Is the calculation the same for hp? I'd like to be able to compare dyno charts of my car with factory gearing to one with 4.10 gears. Also, can these adjustments be made on the dyno so the chart reads correct?
Rear wheel torque equals motor torque times the overall gear ratio....
Rear wheel horsepower equals motor horsepower.....
Rear wheel rpm equals motor rpm divided by the overall gear ratio...
To confuse the issue even more, on dyno test data rear wheel torque is actually numerically motor torque even tho it is called rear wheel torque........what we are really saying by rear wheel torque is this is how much motor torque we have after driveline losses ....
Overall gear ratio is the transmission ratio times the rear end ratio
Thread Starter
4th Gear
Joined: May 2006
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Originally Posted by buttjam
what would be the rated torque of a 95 c4, I believe my car has a 3:45 rear end. I wanted to calculate what I would have if I change my ratio.
Yes, I didn't make myself clear, I am looking for rear wheel torque. Im looking at 4.11 from my 3.45 to be installed. I think 4.26 might be too much.
Instructor
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From: Thornton CO
Originally Posted by vader86
94-96 have 340, sequential injection
1992: 300 hp @ 5000 rpm, 330 ft-lb tq @ 4000 rpm (CAC has the 93 the same as the 92...copy/paste error I think)
1993-1995: 300 hp @ 5000 rpm, 340 ft-lb tq @ 3600 rpm
1995: 300 hp @ 5000 rpm, 335 ft-lb tq @ 4000 rpm
MPI (Multi-port Injection): 1992-1993
SPI (Sequential port Injection): 1994-1996
Biggest thing I found was from http://www.netspeed.com.au/corvette/Vettestuff2.html:
• Horsepower for the base LT1 engine remained 300, but three changes made the engine quieter. First, the heat shield design changed from a single-piece stamping to a two-piece sandwich type that was self-damping. Second, new thermoset polyester valve covers with "isolated" mounts replaced 1992's magnesium covers. Third' the LT1 camshaft exhaust lobe profile was modified to reduce the exhaust valve closing velocity. Also, a shortening of the inlet duration permitted more duration for the exhaust so there was no increase in overlap area. Emissions and idle quality weren't adversely affected. A side benefit of closing the inlet valve sooner was an increase in torque from 330 to 340 lb.-ft at 3600 rpm.
Last edited by stearnman; May 5, 2006 at 12:44 PM.