Upshift Light

[Toranamat69]

Looking at the LT5 wiring diagram for the 1990 models, it shows pin B13 as the 'Upshift light'

I never connected this when I put the LT5 in my Torana but I am doing a heap of changes to it at the moment and sorta like the idea of a shift light on the dash.

Does this output just trigger a shift light on the dash and if so, what RPM does it light up?

Matt

[LGAFF]

Funny, I just read about this in the supplemental book. I always assumed the upshift was for fuel economy but in the ZR-1 its actually for max power/accel.

I might have this backwards but the manual says there is a 200rpm difference in the dash reading to the actual RPM. So as I understand it the light comes on at 5800RPM when the dash reads 6K RPM. On a stock motor they stated this is the best RPM for shifting.

I had shot a note to dominic asking if this could be just modified to come on at 7200RPM

[Toranamat69]

Ha Ha that was going to be my next question - can you get that reset to what ever RPM you want.

[LGAFF]

I am not sure if its controlled by the ECM or the CCM

[efnfast]

"It is better to have the world think you a fool, than to open your mouth and remove all doubt", but here goes anyway. I thought it was a fuel effiency thing, that's why Marc H disables the annoying thing?

[Kevin]

"It is better to have the world think you a fool, than to open your mouth and remove all doubt", but here goes anyway. I thought it was a fuel effiency thing, that's why Marc H disables the annoying thing?

not unless peak fuel efficiency is also near peak hp at WOT. I actually want marc to put mine back in

[LGAFF]

Thats the skip shift....the upshift is traditionally a fuel efficiency play on most cars, but apparently on the Z its not used for that......or so the manual says

[1990 quasar blue]

It does both. Under full throttle it lights for optimum acceleration. However, when cruising say in fourth gear at steady throttle it will come on to help you optimize fuel economy. Im pretty sure the updated portion of the gm code turns it off and not personally done by Marc. He turned mine back on and raised it to help accommodate my current mods. It can only be set so high though and I honestly cant remember what that is at the moment. Maybe 7200 but don't quote me on that. Xfire probably knows for sure.