Q: VSS Removal and Speed Governer for Track Car. - TCCoA Forums
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post #1 of 2 (permalink) Old 01-05-2011, 03:46 PM Thread Starter
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Q: VSS Removal and Speed Governer for Track Car.

As I mentioned in a previous thread, my friends and I are looking to campaign a 95 Ford Thunderbird LX in an upcoming 24 Hours of Lemons race.

I've already gutted the car and am planning a fair number of mods to increase the reliability of the car -- all within the $500 spending limit on non-safety items. After surveying all of the tires we can use with the stock rims, our plan is to use a smaller diameter but stickier tire that will result in 1.5" drop in ride height and an inaccurate speedo reading (off by between 5-15% depending on which tire we finally choose).

One item that was brought to my attention by another guy who already raced a 94 Tbird at Lemons is that with the smaller diameter tires we will definitely hit the governer sooner (between 92 and 103MPH). He also mentioned that the engine starts cutting power BEFORE hitting the governer. This not acceptable to us but the common fix for this problem, an ECU reflash, is not within our budget either.

Q: What exactly happens if we remove the vehicle speed sensor?

I found this thread and this discussion

From what I can tell, putting a cut-out switch on the VSS would result in the following changes to the car's behavior:
1) Speed Governer disabled - GOOD
2) Emissions control stuff messes up -> Check Engine Light - Don't care
3) Speedometer/odometer disabled - Don't Care
4) Cruise Control doesn't work - Don't care
5) Shifting problems?
6) Significant fuel economy problems (like the engine goes into a limp-home mode or starts running too rich/lean?)
7) Something else?

Please confirm for me which items in the above list I would be affecting if I disabled the VSS (or spliced in a switch so I could turn it on/off from the inside instrumentation panel). As stated above, I could live with items 1-4. Items 5 & 6 (esp since this is an endurance race) would pose problems for us.

Q: If there is a better way to solve my problem (disable the governer), please let me know. I'm all ears and thanks in advance for your replies.
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post #2 of 2 (permalink) Old 01-05-2011, 05:28 PM
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Shifting problems are the biggest issue I see. You may want to check the gearing and see if you can swap a different speedometer driven gear in there to correct the problems for your smaller tires. If you used a gear intended for 3.55's or 3.73's you may get better results. The 21 tooth is for 3.73's with stock tire diameter. Using that may slightly increase your top speed limiter and help the shifting issues.

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