I converted my ‘86 to MAF using the Ford Motorsports kit. My ‘86 didn’t have cruise control, hence no VSS, and the kit instructions didn’t say it was necessary. I’m not aware that I’ve ever had an issue with not having VSS.Speed Density cars do not use the VSS for anything other than cruise control. My '88 (originally SD) didn't have factory cruise, so there wasn't even a VSS on the car.
If you convert to mass air at all, you would need the VSS for the ECU, but if you are still running the t-bird speed density ECU than it is not required.
@FastDriver, thanks! Interesting that I've never had an issue with the idle dropping down or stalling. Recent mods (HCI, headers, etc.) resulted in an issue with "jerking" at idle speeds...wonder if the VSS would help with that.If you pull the VSS out of an MAF car, it'll still work, but since it always tells the computer you're going 0 mph, you will not have the buffer the EEC builds in when coasting down to a stop. Anyone that has the VSS will notice that the computer adds a little RPM that finally settles when the car drops under 5mph. That extra RPM buffer is nice to have, because it reduces the chances of the car from stalling and helps the car settle back down to idle softly.
I'm still a newb with the A9L programming, but this is what I've inferred so far. There may be more.
The 'jerking' at low RPMs likely is caused by the duration on the cam, valve overlap, JMO.@FastDriver, thanks! Interesting that I've never had an issue with the idle dropping down or stalling. Recent mods (HCI, headers, etc.) resulted in an issue with "jerking" at idle speeds...wonder if the VSS would help with that.
@General karthief, thanks. The cam has always been the prime suspect. It’s an E303, wish I would have gone with a newer design…The 'jerking' at low RPMs likely is caused by the duration on the cam, valve overlap, JMO.
Installing a VSS will not help in this case
I converted my ‘86 to MAF using the Ford Motorsports kit. My ‘86 didn’t have cruise control, hence no VSS, and the kit instructions didn’t say it was necessary. I’m not aware that I’ve ever had an issue with not having VSS.
Funny…that’s never been an issue.The issues that would arise from not having it is that the vehicle may stall when coming from a stop. So if you notice the car doing that on occasion you would likely want to add it.
But on the 89+ MAF cars it is referenced by the ECU
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