95 LS1 Camaro

iTrader: (5)

I have a Stewart Warner speedometer that worked fine with my LS1. The LS1 put out roughly 4000 ppr ( pulse per revolution ? ) in one mile. My new engine, L92 with a GM harness E67 pcm only puts out about half of that. I'm using the same transmission an 01 F-body T56.

So here is the dilemma, the speedo will only work correctly in the range of 4,000 - 200,000 ppr's. Is there a way I can modify the circuit to correct this? Can I run the speedo directly off of the high side of the trans sensor? I have already tried the low side and it did nothing.

Thanks

rao

iTrader: (18)

Any tuner can adjust the speedo output to match just about whatever number you want.

busta9876

iTrader: (3)

your e67 pcm is likely expecting a 40 pulse per driveshaft rev sensor. your t56 will have 17, just under HALF, this would explain your low reading.

I don't know about your speedo, but autometer speedo's work off the high signal directly from the speed sensor.

95 LS1 Camaro

iTrader: (5)

Hmmm I'm wondering if there will be drivability issues with the incorrect pcm input? I guess I'll find out, I'm leaving for the Hrpt long haul tomorrow. Last night I decided to drive 2 miles to get enough ppr's, then just remember 30 mph is actually 60. The funny thing is while doing it, I thought, hey dummy the gps unit will give me speed.

The Stewart Warner guage unlike the Autometer will not use either the low or high sensors raw outputs.

I'm assuming I can also change the reluctor for the sensor?

LS1-450

iTrader: (33)

^^^ An easier solution would be to leave the VSS/PCM circuit @ reluctor alone so that there are no related issues in that area & then install a Dakota Digital spedo claibration unit. They are or were around $70-$80 bucks a couple of years ago & are a very simple piggyback add on. Can tie in either between the VSS & PCM or PCM & speedo, as you choose. Good-luck

TTLS1GP

iTrader: (10)

what ^^^ said