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View Full Version : Some Progress and thoughts on VSS


87-944S
07-10-2009, 12:27 AM
Hey Everyone,

I have my custom Griffin radiator installed, basically it's a 951 sized radiator without the bung for the fan control, and a proper petcock for draining instead of the threaded plug Porsche used.

I have an 87 944S, and if you want to use a Turbo radiator in a 944 N/A getting a lower radiator support from a 944 Turbo or S2 makes it a sweet bolt in. I'm able to utilize all the 944S radiator shrouds, and the belly pan fits.

I'm using the GM computer to control the fans, and I can change turn on/off temp settings with my HPTuners. I'm just about done with wiring, just need to hook up the tach, A/C select and OBDII port.

I have a bit of work to finish the BMW hydroboost setup, I have all the parts, re-made the front brake lines, installed big black calipers (928 GTS) and 993TT front rotors. I did this for much less than most kits, all parts are new, PM me if want to know where I got my parts. Rear brakes are 968 calipers, and 968 M030 rotors, these are factory drilled and look great with the 993TT front rotors.

Now for the VSS part, I tried to fit a GM sensor in the front spindles, but really couldn't make it fit. My parts car is an 89 944 N/A that had ABS, and was wrecked in a rear end collision several years ago. Originally, I was thinking of moving the ABS to my 87 hybrid, since it doesn't have ABS, and I like it. Problem is the fusebox on the 87 didn't have the relay sockets for ABS, and I wasn't up to doing a swap on the fusebox etc.

So, I started the attempt at using the 968 front spindles and ABS reluctor on the car for VSS. Since this didn't work, I decided to look at the rear of the car. This is looking really promising, the 87 944S rear trailing arms have a hole in the top for the ABS sensor, which looks like I will be able to mount the GM sensor there. I'll grab the reluctor ring from my 89 parts car, reprogram the ECM for the 45 tooth ring and I think I'll be good to go!

For those with 87 on cars without ABS this may be a viable solution. I'll post pictures as I work through this. I need to get a gallery setup over here, it's a shame I can't just copy the old one over!

Mike

expuppy
07-10-2009, 05:44 PM
Do you HAVE to have VSS? I am not running it on my car and the only impediment is that i cant milk my 0-60 times out of the ECM.

944-LT1
07-10-2009, 10:50 PM
I'll grab the reluctor ring from my 89 parts car, reprogram the ECM for the 45 tooth ring and I think I'll be good to go!

Grab that cam gear off your parts car...should be 40 tooth already. Machine it and slap it on your passenger side CV joint.

OR.....PM DawgZ...hes the foremost contributor in this area.

944-v8
07-11-2009, 04:42 PM
Hi:Did you try using the signal out of the front wheel ABS sensor ? I would compare the two sensors and see if there is any real difference in drive requirements. It might be real simple to take the ABS signal and feed it to the ECU. The run from the front spindle for wires would also seem more convenient.