i knowticd that my 91 camaro has a upshift light and beign that my car is automatic its not activated is there a way to activate it ? adjust it things like that?

 

Its in the PROM, so you'd need a custom PROM to activate it. However, with your automatic PROM, if you put a light in it now, it will light up when your torque converter is locked up.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

Actually, the '90 - '92 ECMs have two separate I/Os to control the TCC & the shift light. The earlier ECM style used a single I/O to control the TCC & shift light.

Tim

 

Ok, my mistake. The guy I found this out from has an 86.

 

so how do i actually do this?

 

To make the up shift light work (turn on above a certain RPM), you would have to pull the cluster & install a light bulb & bulb holder in the cluster & then run a wire from the connector on the cluster (it should not be populated at the present time) to an RPM activated switch - MSD makes them.

Tim

 

Thanx Tim i looked the parts up seems fairly eassy now thanx

 

These RPM activated switches, can you set them to what rpm??

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Godti
'89 Trans Am (Red)
305 TBI 5spd

 

Any RPM you want ? Hence the word adjustable ?

 

MSD sells plug in modules (1% resistors) that control the activation point of the rpm activated switch. The modules are available in 200 rpm increments from 3000 rpm to 10,800 rpm. The Summit part number for the rpm activated switch is MSD-8950. It's about $54. The rpm activated switch has both N.C. and N.O. switch outputs.

Tim

 

hey tim u seem to know your stuff about this shift light...i want to keep mine off it comes on sometimes when im riding at steady pace not pushing or letting off the pedal if i do it goes away....car is usually reving 25oo when it happens any ques or sugguestions as to how this can be fix or what might be causeing it? thanks

 

If you don't like or want the light to come on, all you have to do is remove the cluster, take out the bulb and holder, and replace the cluster. I assume you have a manual trans, and that's it's normal function