Speed Governor

Right. It's too mushy stock to handle those speeds. My fuel cut off is set to 255 mph lol. With the sway bars and stb's it's MUCH more stable at the higher speeds.



Again, the Tech II has no function to "reset" the fuel cut-off speed. A Tech II actually has very minimal "programming" capabilities. Anytime I had to program or flash a car, the Tech II needed to be hooked up via Internet to GM's database where a "stock" program was flashed (newer cars use a CANDI module). The only way I know of to absolutely change it is a DHP.

The aerodynamics of the car actually generate some down pull from underneath (my guess) and make it quite stable at high speeds. I did a few miles exceeding 130 once on a deserted stretch of highway. Hit 140 a few times. Plenty of power left, but needed to adjust shift points to stop it from dropping into redlining 3rd. Playing catch-up to a few guys who flew past me when I was going 90... It was surprisingly stable. To me. This was before I put in the sway bars etc. I did have speed rated tires so wasn't worried about them.

I would have been able to go faster, but every time I pushed the pedal down it downshifted to 3rd. I was just able to cruise along at medium throttle.

I changed my programming with DHP PowerTuner, which to my knowledge is the only tuner that can do a '96, but not available anymore. HP Tuners cannot do a '96 last I knew.

deekster_caddy wrote:

The aerodynamics of the car actually generate some down pull from underneath (my guess) and make it quite stable at high speeds. I did a few miles exceeding 130 once on a deserted stretch of highway. Hit 140 a few times. Plenty of power left, but needed to adjust shift points to stop it from dropping into redlining 3rd. Playing catch-up to a few guys who flew past me when I was going 90... It was surprisingly stable. To me. This was before I put in the sway bars etc. I did have speed rated tires so wasn't worried about them.

I would have been able to go faster, but every time I pushed the pedal down it downshifted to 3rd. I was just able to cruise along at medium throttle.

I changed my programming with DHP PowerTuner, which to my knowledge is the only tuner that can do a '96, but not available anymore. HP Tuners cannot do a '96 last I knew.

I don't know if people (except maybe you) will ever be able to appreciate the wind tunnel magic of the 8th gen Riv.

It has been claimed by at least one driver of a highly modified 8th gen Riv that 160 mph is not only possible, but has been done, unofficially, on public roads. I have reason to believe this to be true. The gearing and C of drag certainly allow it. Compare to a report of a 3rd gen Acura TL doing 170 mph at a Honda test track some years ago - more reason to believe the Riv could do the same.

I have achieved no higher than 135 mph in my Riv, at which point I succumbed to the fear that the hood might fly off the car. It was vibrating profusely at that speed. Evidence of a high pressure situation under the front end. I am not inclined to believe the Riviera generates any actual down-force at high speed (almost no production car does this). I like to think of this kind of speed testing as being on a car-sized puck, floating across a mile long air hockey table. Better not need to turn the car even 1º.

How much do one of these power programmers run? IS it something i can order from Summit

RaceRiv1 wrote:

How much do one of these power programmers run? IS it something i can order from Summit

No you can't order one. You'll have to find one used because they don't make them anymore. I think L67 is selling his right now.



https://rivperformance.editboard.com/t8533-for-sale-pulleys-rockers-tuner-more#134428

This is the product: http://www.hptuners.com/order.php

Please understand it is extremely dangerous to exceed the governed speed limit unless you've modified the brakes, tires and suspension components to support this demand. Buick didn't speed limit the the Riviera to make it less fun, or to prevent you from braking the law - they did so because certain parts used on the car were not designed to operate at such high speed, and could fail. Especially with a 10+ year old car, always replace/upgrade needed components before attempting a high speed run.

^^^ This is why I would not turn the speed limiter off on anyone else's car but my own. Damn GTP kids would plead and plead. Sorry, if you are that desperate and will be exceeding 110 in the 1/4 mile you should have your own tuner! I will make it get there sooner, but not _faster_

(every time I see this thread title, all I can picture is Arnold Schwarzenegger diving a car fast...)

AA wrote:

OEM limit setting is 108 mph. With PowrTuner, mine's now at 168 mph (the speed rating of my tires), but it's still the original PCM unit, just has a new BIN pregram. All OBDI PCMs can be changed, as long as DHP (or another company) makes a BIN for it.

Holy shit. I can't imagine getting my Riv up passed 100mph. 168mph sounds insane to me. Have you ever had it over 150?

Over 100mph the stock suspension gets a bit "floaty." You would for sure want some work done in that area before going much faster. (Might just have been my 95 suspension way back in the day.)

Quote :

Holy shit. I can't imagine getting my Riv up passed 100mph. 168mph sounds insane to me. Have you ever had it over 150?

At Nelson ledges, you were in the car doing 112-ish on the back straight. I had her up to 135 once, and had plenty of room to go. My biggest concern at that point was the hood flying off. There's some serious high pressure living under there.

Ive had mine up to 120 and she's still pulling.barely chuffing.