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I have seen several references to recalibrating the speedo after changing rear end gears. This makes no sense - gears will affect only RPM - speedo is affected by changing wheel/tire size to bigger or smaller diameter. Am I not correct - after changing the gearset, acceleration will improve; RPM levels will be higher in each gear at a given speed; but the speedo will be the same as before.
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95Camaro3.4T5Conv Red/White*SLP Bilsteins*BMR Tower Brace*CAI*NiehoffIgn*NGK PlatPlugs*DelcoHiPerfWires*FlowmasterCatback*RedDe vilReso(no cat)* DynoMax Muffler*B & M Shifter*Eurolite Lamps*Yokohama Avid 235/55/16*GM 3.73s*Auburn LSD*Sirius*All DONE! -
The computer calculates the speed of the car by the speed of the tranny. Changing the rear end gears screws up all the calculations, because for a given RPM you'll now be going a different speed. RPM will show correctly no matter what gear set you have.Matt
1998 Mystic Teal Camaro M5
Whisper Lid, Pacesetter Headers, Catco Cat, Dynomax Super Turbo, B&M Shifter, BMR STB, LSD, P&P Intakes, GT2 Cam, Comp OE Lifters, 1.7 Roller Rockers, Pushrods, SSM Heads, DHP PowrTuner. -
So how do you recalibrate - I am going from 3.23's to 3.73's and the RPM difference in 5th is about 500 across the range.95Camaro3.4T5Conv Red/White*SLP Bilsteins*BMR Tower Brace*CAI*NiehoffIgn*NGK PlatPlugs*DelcoHiPerfWires*FlowmasterCatback*RedDe vilReso(no cat)* DynoMax Muffler*B & M Shifter*Eurolite Lamps*Yokohama Avid 235/55/16*GM 3.73s*Auburn LSD*Sirius*All DONE!Comment
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Your RPM will not be affected. It will show the correct RPM all the time.
Your speedo will be 13% off. When you see 70 mph on the speedo, you'd really be going 60 mph.
You need to either have the PCM tuned (by a company such as Fastchips) or install a device to correct the signal.
Here's a post that refers to it:
http://www.camarov6.com/cgi-bin/ulti...;f=23;t=003982
There's others there if you try a search for something like "3.4 speedo".Matt
1998 Mystic Teal Camaro M5
Whisper Lid, Pacesetter Headers, Catco Cat, Dynomax Super Turbo, B&M Shifter, BMR STB, LSD, P&P Intakes, GT2 Cam, Comp OE Lifters, 1.7 Roller Rockers, Pushrods, SSM Heads, DHP PowrTuner.Comment
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