I recently read the post on removing speed limiter and it stated that it could be bypassed by installing an off and on switch. The article said to cut a brown wire labed A 10 but I checked and mine does not have that wire. But the car does not pass the 110 mark. Please Help.

 

You shouldn't be going that fast anyways

A 10 is the PIN placement on the ECM connector. The smaller of the 2 connectors is where the brown wire should lead into. The wire is brown though

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• my Formula Homepage
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What year is the car & what engine?

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Tim

1992 Z28, 305 TPI 5 speed, 12.1 sec @ 114.7 mph

1984 Berlinetta 305 TPI Auto, 13.8 sec @ 99.7 mph

 

It is a 1991 Z28 With all stock 305 5.0 engine and a 700R4 tranny. The speedometer reads 110mph.

 

can you just buy an aftermarket chip to eliminate the speed limiter? i personally would do that before cutting wires.

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'92 Z28,t-top,PPG jet black,5.0L TPI,Auto w/stage 2 sft. kit,
michelin pilot 245/50/ZR16 tires,polished plenum/intake,flow tech 3" exhaust,PIAA driving lights,2 kicker 10" comp vr subs,jl audio componet set in q form kick panels,kicker ix405d 5 chanel amp,pioneer deh-p735 deck

 

me and my friend burnt a chip to get rid of that, all it does is just cut fuel at that speed, make sure your tires can rotate that much

 

How do I determine if my wheels can turn that much. And when you burnt the chip all you changed was the fuel cut-off, or other stuff like fuel ration or anything?

 

Check the speed rating on your tires - check out www.tirerack.com for info on speed rating. The PROM parameter to modify is "fuel cutoff speed".

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Tim

1992 Z28, 305 TPI 5 speed, 12.1 sec @ 114.7 mph

1984 Berlinetta 305 TPI Auto, 13.8 sec @ 99.7 mph

 

On the 91 TPI the VSS wire to cut is the yellow wire at B9. As a word of warning this will disable your speedometer and may have other adverse affects. I agree with the other who say you should have the prom changed to what your tires can handle. If you do not have access to a burner there are many here that can help you out

John

Heart of Texas Power and Performance

 

The speed ratings of tires are for sustained speeds (around 30 minutes if memory serves). A brief jaunt above the tires ratings will not cause them to disintegrate.

 

Ok when you say that it is going to disable my speedometer will it just jump on 110mph or will it go back down to 0 mph while it is while the VSS is shut off.

 

In 91 the speedometer was electronic. It was driven by the computer through the 400 pulse per mile output. The only way the computer can generate this signal is to use the input from the VSS. If you remove the VSS signal the speedometer will drop to 0.


John

Heart of Texas Power and Performance

 

The speedo output from the ECM is actually 4000 pulses per mile, not 400.

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Tim

1992 Z28, 305 TPI 5 speed, 12.1 sec @ 114.7 mph

1984 Berlinetta 305 TPI Auto, 13.8 sec @ 99.7 mph

 

You are right 4000 not 400. Sorry about the typo.

John

 

You mean if i was to try to go past 110 in my 1987 iroc (5.0 w/ 5 speed) i couldnt?

guess i'll try later today after school.

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"I'm not an "expert" per say though i did sleep at a holoday in last night."

Still lookin for the right Z

 

Lack of a VSS signal will not prevent you from exceeding 110 mph. It will cause an ELECTRONIC speedometer to read 0 mph. A cable driven speedometer will read actual MPH regardless of whether a VSS signal is present or not. I believe that 87 is cable driven and 91 is electronic.

John

 

So what would have to be done if I want my electric speedo to read after 110? Do I have to get a speedometer that reads 140 or will the burnt chip allow me to.

 

What they are saying is IF you cut this wire your speedo WILL NOT work. NO matter what speed you're going it will read ). THe needle will not move because that wire is a wire that controls the speedo.

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1987 IROC-Z T-Tops wait... GUTTED MAF!

 

So once again can I change my speedo to a 140mph then burn a chip that will allow me to reach that speed? If yes tell me wether it is a direct bolt on or do I have to mess with something more than just the speedo.
When burning the chip, if anyone knows what has to be changed? I know the speedlimiter, but what else? How about that 4000 pulses per mile? By the way what is that? Thanks