94vette75

I have a 94 corvette with an automatic trans. I have done a dana 44 swap. Now I think I want to put a ZF6 in it. I found a 89 ZF6. Is the speed sensor from a newer ZF6 gonna fit in it? I believe all of them are plastic gear driven from what I read. I have tuner cats as well so I can change the pulse count.. It would be very helpful to get any info on that..Thanks

WVZR-1

Yes the later ZF VSS will fit and the connector shouldn't need to be changed. The later ZF VSS is quite inexpensive. The one in the '89 if it doesn't leak is quite hard to come by so don't just 'toss it'.

94vette75

Thanks a lot... I couldn't find that info anywhere.

94vette75

What do I set the Speedo calibration to. The Speedo calibration currently is set to 40 pulses per revolution from the auto trans

WVZR-1

You set nothing, you need to match the drive/driven gear combination to that required by the rear axle ratio and the tire size.

Post axle ratio and tire size.

94vette75

The speed sensor I put in was for a 94 6 speed. Plastic gears fit. Its a 3.45 axle 315/35/17 tire. Plug for vss plugged right into it. Speedo reads zero. So I figured I had to do something in tunercats

WVZR-1

The PCM for a '94 will need an M6 tune and that I'm afraid I can't help you with. You should need a 42 tooth (green) driven gear for the VSS.

Do you have the BIN file for a '94 M6 tune? Do you have choices for both 2000 and 4000 pulse?

Contact user "blue94" he's around regularly and I believe he's done this swap and should be able to help. User "simple green" isn't around very often but he could maybe help also.

Post back, it interests me. The LT5 never got a PCM in '94 or '95 but still used the ECM and it's all I'm familiar with.

blue94

The changes for the speedo with Tunercat is the easy part. You will only need to select manual trans and the use the tool to calibrate the setting for the rear gear and tire size.

in ECM Switch Table deselect Automatic Trans Option

in Tools select Speed Calibration enter Tire Size, Rear End Ratio, Y-Body Car, Manual Transmission. Then click Calculate and Apply

You will also want to disable CAGS then you can ignore that sensor on the trans.

WVZR-1

I thought that surely would be a question you could answer. A question though. Is it going to want a tire size or a dimension? If dimension which? If a dimension I'd think you would need to use a "loaded" dimension for it to be correctly applied.

blue94

with Tunercat you can do it either way, size or dimensions (and I agree if using that it's unloaded or vendor specs). with the tool when you click calculate it shows the settings before you click apply.

WVZR-1

Does it want a circumference or a diameter? I have a "loaded" dimension of each for a 315/35 from my car and if I were doing this which would I use?

blue94

I will have to look when back home, I have always just used the tire size 315/35/17. off the top of the head I think it was diameter/height

blue94

for tires... it is size, diameter (inches) or revolutions per mile

94vette75

I have a stock m6 bin file. I will compare it to the modified auto tune I have now. What I would like to do is switch my tuned program to manual and save it as a separate file. So i do nothing with the ppr ? Just type in the tire size and gear ratio? Because in f body cars its 40ppr for auto and 17ppr for stick... I'm sure this is just a computer tweak I can do with tunercats.

WVZR-1

The F-body I believe uses a 17 tooth reluctor wheel in the differential and is very different.

blue94

yes, ALWAYS first read and save your current tune.

in the switch table deselect automatic and cags.

If you use the tools, speed calc, then enter you tire size, rear gear, manual trans and car type y-body it wll set everything for your speedo.
save as new file
flash and done

94vette75

Ok cool. I'll have time to do that Friday . I'll let you know what happens

94vette75

Thanks again blue94. Did what you said on tunercats and Speedo is dead on.

blue94

Cool..