Before/After on a Gear change C5

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03-16-2009, 09:13 PM

Alvin

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Before/After on a Gear change C5

Hey,

Just wondering if anyone has done a before and after on just a gear change with a vette. Specifically a 3.42 to 3.90. I'm guessing about 5rwhp difference but just want to see if anyone has actually done it.

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03-16-2009, 11:14 PM

allngn_c5

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Damn bro, you tricked me. I thought you did the comparison and was posting the results.

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03-17-2009, 02:07 AM

Moonder

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Quote:

Originally Posted by allngn_c5

Damn bro, you tricked me. I thought you did the comparison and was posting the results.

Me 2

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03-17-2009, 09:19 AM

PewterScreaminMach

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Quote:

Originally Posted by Moonder

Me 2

x3. Damn.

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03-17-2009, 09:28 AM

venom ws7

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O.K O.K x4

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03-17-2009, 02:47 PM

LS1 SPEED

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I seen 14rwhp on my 02 Z06.

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03-17-2009, 02:57 PM

blu1

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Quote:

Originally Posted by LS1 SPEED

I seen 14rwhp on my 02 Z06.

wow, that is A LOT more than I expected! This was a before and after test with gear change only?

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03-17-2009, 04:20 PM

john563

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I have an fbody but I lost 10 rwhp going from 3:23 to 3:73 gears

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03-17-2009, 05:24 PM

ScreaminRedZ

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Wow, these numbers are higher than I thought they'd be.

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03-17-2009, 06:58 PM

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Slowhawk

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It hurts torque #'s alot too.

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03-17-2009, 07:21 PM

#11

john563

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Quote:

Originally Posted by Slowhawk

It hurts torque #'s alot too.

yeah it hurt the tourque too..I think it was 5 or 7 cant remember,but it was worth loosing the "dyno" number for the gears IMO

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03-17-2009, 07:24 PM

#12

TXZ28LS1

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Quote:

Originally Posted by allngn_c5

damn bro, you tricked me. I thought you did the comparison and was posting the results.

lol!!!:d

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03-17-2009, 07:29 PM

#13

ScreaminRedZ

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I was talking to one dyno operator who said that gears that are very low (numerically) can also hurt the hp readings. Any truth to that?

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03-18-2009, 08:21 AM

#14

Sigforty

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Quote:

Originally Posted by ScreaminRedZ

I was talking to one dyno operator who said that gears that are very low (numerically) can also hurt the hp readings. Any truth to that?

Well HP is calculated from the measured torque. So any drop in TQ would change HP as well.

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03-18-2009, 09:30 AM

#15

Alvin

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Quote:

Originally Posted by LS1 SPEED

I seen 14rwhp on my 02 Z06.

Thanks, Exactly what I was looking for!

Quote:

Originally Posted by ScreaminRedZ

I was talking to one dyno operator who said that gears that are very low (numerically) can also hurt the hp readings. Any truth to that?

I have seen that also, we took one car from a 2.73 to a 3.73 and it picked up 4-5rwhp It was actually done on the same day too.

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03-18-2009, 03:54 PM

#16

PewterScreaminMach

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Quote:

Originally Posted by Alvin@Tick

Thanks, Exactly what I was looking for!

I have seen that also, we took one car from a 2.73 to a 3.73 and it picked up 4-5rwhp It was actually done on the same day too.

Huh, so there is technically an "optimal" gearing for dyno results then? I'm guessing the Supra guys have it all figured out.

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03-18-2009, 04:21 PM

#17

Mike@Diablosport

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Quote:

Originally Posted by PewterScreaminMach

Huh, so there is technically an "optimal" gearing for dyno results then? I'm guessing the Supra guys have it all figured out.

ROFL, best post i have seen today....

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03-18-2009, 04:40 PM

#18

vettenuts

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Interesting aside for a Vette. DTE Powertrain requires the use of 75W-140 gear oil. Redline told me that the loss in going from 75W-90 to 75W-140 in a chassis dyno would be 3%-4%. Thats a lot if you use 400 hp as a baseline. I have no proof but those are the numbers they gave me. Phil at DTE might have more information, but I guess my message is that the gear oil requirements on a DTE Vette may play a role as well.

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