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1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-29-2003, 04:21 PM   #11
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thats what im told. it goes up to 110mph and then holds steady, nomatter what i do.
Too many lawsuits for GM forced them to limit cars sold with standard rated (*) tires to 108 mph.
With my H rated tires mine is limited to 128 mph.
The new Comp Grand Prix has V rated tires and is limited to 138 mph.
Z rated tires would bring the limit up to 149 mph
....but I want the Y rated...for 186 mph....ya right. :P
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Old 06-29-2003, 10:31 PM   #12
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Quote:
Z rated tires would bring the limit up to 149 mph
Actually Z rated tires are 149+ MPH. Supposedly you can go as fast you want with them.

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If i rip the governer off, lord knows how and where, what speed could i do at 5000 rpm in overdrive?
You would never get to 5000 rpms in overdrive. I don't know about your car because it has different gearing and everying, but a Sereis II L67 would theoretically do 255mph @ 6000rpms in overdrive, but obviously does not have the power to do so. Top speeds are usually acheived in 3rd gear though I think. Overdrive is just a really tall gear.
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Old 06-29-2003, 11:18 PM   #13
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Actually Z rated tires are 149+ MPH. Supposedly you can go as fast you want with them.
Ya, that'* true for some the older design ZR which are supposed to be rated at 149+ but some of the newer high performance tires are rated using a different convention, for instance the new 2004 Crossfire has 255/35 ZR 19 96Y.
My Bird'* Pirelli'* are P255/60 R 15 102V and Bonne'* RSA'* are P235/55 17 98H.
Some cars sold with straight ZR rated tires, like the new 2003 Dodge SRT-4 and Subaru WRX STI for instance, are limited to 148 mph.
Mazda RX-8 is shod with 225/45R 18 91W but limited to 148 mph.???
Dodge Viper P345 30ZR 19 98Y....top speed 190 mph.
Maybe it'* a Europeon designation.???
The Audi RS 6 has 255/40 ZR 18 99Y but limited to 155....but then most Europeon cars are limited to 155 for road safety not tire liability reasons.

Do you or anyone elso have a better explanation of the tire rating designations.
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Old 07-01-2003, 04:27 AM   #14
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How can you guys go so fast, in my 96 SE I could only hit 108 at 4,000 RPM, after that it would stop and go again and again.
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Old 07-01-2003, 12:14 PM   #15
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How can you guys go so fast, in my 96 SE I could only hit 108 at 4,000 RPM, after that it would stop and go again and again.
Like I said, because your car probably came with standard * rated tires that are limited to running continuously at a top speed of 108 mph. So GM, in their infinite wisdom (Legal term for -do it or get their *** sued off when someone'* tire blows off at 150 mph and they are become a quadrapolegic) program a speed limiter in your computer.
My SSEi came with H rated tires, so is limited to 128 mph, which is the limit for H rated tires. The new Comp GTP comes with V rated Comp TA'*, so is limited by the computer to 138 mph.
Mine is also limited to 108 mph in 3rd gear too, which happens to be at 4000 rpm, but 4th gear will take it up to 128 mph. I think they do this to protect the engine from running at a continuous high rpm.....insurance warranty reasons.
All computers can be modified to eliminate or raise the pre-set limit, but it is strongly recommended to upgrade your tires first.
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Old 07-03-2003, 07:45 PM   #16
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If you are really interested the speed limiter is controlled by a single byte in the PROM.
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Old 07-03-2003, 11:16 PM   #17
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If you are really interested the speed limiter is controlled by a single byte in the PROM.
Soooo..........
How can it be disabled...besides sending the computer away for a reburn?
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Old 07-04-2003, 01:09 AM   #18
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Originally Posted by 2000SilverBullet
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If you are really interested the speed limiter is controlled by a single byte in the PROM.
Soooo..........
How can it be disabled...besides sending the computer away for a reburn?
I think you'll have to either ruburn the PCM or maybe get an aftermarket chip that disables it.. I don't know if this holds true on bonnie.. but on my old 89 Crappylier.. I have a switch that disables the signal from the tire and kills the governor but the speedo goes dead too.. I don't know if it will work on pre 89 Bonnies.
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Old 07-04-2003, 02:25 PM   #19
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Originally Posted by Drifter420
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Originally Posted by 2000SilverBullet
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If you are really interested the speed limiter is controlled by a single byte in the PROM.
Soooo..........
How can it be disabled...besides sending the computer away for a reburn?
I think you'll have to either ruburn the PCM or maybe get an aftermarket chip that disables it.. I don't know if this holds true on bonnie.. but on my old 89 Crappylier.. I have a switch that disables the signal from the tire and kills the governor but the speedo goes dead too.. I don't know if it will work on pre 89 Bonnies.
yup... u could probally put a switch on the VSS to kill the signal... anyone know what codes doing this would cause? and what systems (ABS obviously) this would disable?
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Old 07-05-2003, 12:33 AM   #20
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Believe the fuel cutoff on a '90 "C" engine is at (97Dh and the resume is at (97Ch. Burning your own proms requires about $200 in hardware and software. See http://www.thirdgen.org/techbb2/foru...4a3&forumid=16 and http://www.tunercat.com

ps that is what is visible to the world but not this machine.
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