Speed Limiter?

[CAPRICE LIFE]

im tryin to find out if there is a speed limiter so u cant go past 85 mph....dats da mph my caprice stops at...id ther ne thing i can do to tha tranny to undo this?my caprice is an 82 canadian model

[TheCrazzyOne]

I could be wrong but I dont beleve there is a limiter.
I have an 84 and ive done over 100 several times with it.
My speedo stops at 85 but I do know that Ive kept accelerating after Ive hit that point.
What size motor and trani do you ahve?

[Mira_cz]

I have 91 caprice and I have done over 100 mph several times too. I think there is no speed limiter.

[HLandin]

Right, the speedometer only goes to 85 but I'm sure the car can go faster. To my knowledge, the only cars that had a "speed limiter" if you would, were the 94-96 non-9c1 Caprice with the LT1. The transmission on the non-9c1 model would downshift at WOT if the car was already going 120 mph (to prevent it from going faster) while the 9c1 model would allow the transmission to remain in 4th to reach its top speed in 130-140 mph range.

[Mira_cz]

Impala SS have limiter on 160 mph. But Im not sure it can run so fast.

[CAPRICE LIFE]

Ok...thanks....da Engine Is A New 305 2bbl Wit An 350 Tranny....now This 305 Has Alot Of Power That I Ddiint Knew Came Wit A 305...maybe Cuz Its New?

[Nym]

Originally Posted by Mira_cz

Impala SS have limiter on 160 mph. But Im not sure it can run so fast.

Chevy High Performance magazine did a profile last year on a guy with an Impala SS who tops out at 173 mph!

[Blue Bowtie]

That's 10 MPH faster than my '94 - Which translates to about 30HP. The programmed fuel cutoff on the '94 and '95 Impalas was 254MPH. The cars are drag limited to about 145-ish in factory form.

Earlier ECMs also had a fuel cutoff MPH parameter. Most of the factory programs set the limit at 93 MPH or 118 MPH (the 'P' or 'T' speed rating of the original equipment tires), whereas a few vehicles had the 255/254 cutoff/cut-in settings - Only those with "Z" rated tires (constant speed in excess of 150MPH), like some Camaros, Firebirds, and Corvettes.

[96_9c1]

Originally Posted by HLandin

To my knowledge, the only cars that had a "speed limiter" if you would, were the 94-96 non-9c1 Caprice with the LT1. The transmission on the non-9c1 model would downshift at WOT if the car was already going 120 mph (to prevent it from going faster) while the 9c1 model would allow the transmission to remain in 4th to reach its top speed in 130-140 mph range.

All the cars from 94-96 have speed limiters. IIRC, on the civi Caprice its around 108, 9c1s are limited at 147 and the Impalas cut-off at 154.

The transmission does not down shift, the fuel is cutoff The limiter was set to the rating of the tire.

Blue Bowtie:
255/254? I sure hope you meant to say 155/154

[radioman2002]

There is news video from I believe Oklahoma, of a 95 Impala SS being pursued at over 155MPH. I don't have it anymore (was on old computer hard drive that crashed) and I havn't seen it on the web anymore. There is also radio traffic from the news helicopter, that was having trouble keeping up with the car. He was advising his station that he was taking the helicopter into its red zone of operation.

[Blue Bowtie]

Umm... Umm.. Ummm. Someone had better look at the program hacks for the OBD-I Impala instead of repeating what's been tossed around in chat rooms and forums for so long. I dfon't know about plain Caprice models, or 9C1s, but mine is programmed at 255/254. My older Trans Am is the same, and it came from the factory that way. About everything that I burn a custom PROM for gets the same treatment. Most customers opt to have the original limits raised. If you want to look it over, here's my current binary:

http://72.19.213.157/files/VADR0322-94SS-LT4A.bin

FWIW, most Rangers and Long Rangers have trouble maintaining over 135Kts (about 145 MPH) for very long. Doughnut payload greatly affects airborne performance - Textron doesn't test/qualify them with a few dozen bear claws aboard.

[ghost1234]

My '84 would go as fast as its horsepower wind and hills allowed.
My '92 has the engine cut out somewhere between 170 and 180 kilometers per hour. I'm guessing because the speedo goes up to 160 kph (100mph, cutoff is guestimated at around 110-115)
I test drove an '9? ex-cop car once and it had an engine cutoff on it too.

[PeteA216]

I thought (at least with the 700 R4 Tranny) that there was a centrifugal govonor inside that steel dome piece near the tail on the drivers side. I'm probably wrong but I thought almost for sure I remembered reading about that.

[silicon212]

There is a governor in the transmission, but this governs transmission line pressure, not engine/car speed. It is there to control shift points and ensure proper apply pressure to the clutches and servos.

[PeteA216]

Oh, well I guess its a good thing I didn't try to take my neighbor kid's advice and try to disable it . Is that also what keeps the transmission from going into 4th gear at WOT?