[Z06] Gear change require retune?

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Nov 6, 2011 | 03:51 PM

Sargent1

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Instructor

Joined: Jul 2008

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From: Charleston SC

Gear change require retune?

Time to freshen the differential, so considering a move to 3.90 gear set in the process. The car is primarily used for open track with occasional drives to work. Not concerned about gas mileage or RPM on the highway, but would like faster acceleration coming out of corners. Question here is do I need a retune with just the gear swap or will my current tune work? Thinking it may need retune to make the speedo correct.

Appreciate the guidance.

Regards,

Chris

Nov 6, 2011 | 04:09 PM

momo20

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Joined: Apr 2004

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From: pueblo co

3:73 would suit what your looking for a lot better

Nov 7, 2011 | 12:05 PM

kerryt1

Drifting

Joined: Apr 2006

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From: Edmond OK

Quote:

Originally Posted by Sargent1

Lots of guys running 3.90 gears with good results. You don't need a retune, but your tuner should be able to quickly change the gear ratio in your calibration.

Nov 7, 2011 | 12:11 PM

Tech

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Joined: Jun 2005

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From: St. Louis Missouri

See Caddy's response below. Manual transmission C5s don't need PCM adjustments for gear changes.

Last edited by Tech; Nov 7, 2011 at 12:54 PM.

Nov 7, 2011 | 12:38 PM

Caddy2006

Instructor

Joined: Nov 2010

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From: Katy TX

No changes necessary for the speedo to read correctly. The speedo sensor on the C5 diff reads the ring gear (wheel) speed, regardless of the input shaft speed.