Why do i Top at...

why does my 1995 s/c series 1 top out at just about 104 -106? is it that the engine CANT go faster? or what? my speedometer says 120...and i as soon as i hit 104-106 it drop to about 95....i would like to go faster lol...i use 93 octane..

it is electronicly governed at 108 by the pcm. the car can go much faster than that, it is very aerodynamic and has plenty of power to got at least 140 with proper tires.
your speedo may read 106 b/c at those speeds it is less accurate and even different air pressure/wheels/tires can make it change. btw, the stock tires are rated S which is for sustained speeds of 112mph, if you want to go faster you will need BOTH better tires and a reporgramed pcm without a higher set sepped limiter.
also, aftermarket tires that have different than 26.62in tires (total outside diamiter) will give an incorect reading to the speedo so you will need to have that adjusted or calibrated.

Fresh suspension parts also wouldn't hurt. This car gets floaty over bumps at high speeds with the OEM suspension.

so basically ur tellin me its made to do this....and to get it to go faster i need to do some major revamping.....

To get it to go faster, you need a reprogrammed PCM. To get it to go faster safely requires a bit more. I've never been above 130 personally. There's no where around here to go any faster. She felt good at that speed, though. I need to go out west.

i dont know how to program a PCM....and im sure it requires more knowledge then id know what to do with...cuz i dont know what a PCM is...im not really supposed to be goin over 55 in my area..but i LOVE to open her up on the parkway...

This is a very interesting post. Living here on a small, crowded island, we have no place where one can reasonably... much less safely... drive a car at speeds over 70. What the hell... our legislature recently passed an excessive speeding law, which, in a nutshell, says that... if you get caught going 30 mph over the speed limit, or a minimum of 80 mph on our freeways, you'll get fined a big chunk of change- $300+. Subsequent infractions will get your butt tossed in jail... do not pass go, and forget about hoping for your lawyer to make sure you're resting your head on your own pillow that night... your ass goes to the pokey... period!

...but it has been my fantasy dream that GM had offered the Northstar V-8, with 18" rims and tires, and an appropriate tuned suspension for these 9th Edition Rivieras... would've been one hellava ride... IMO...

I've topped off at 115 on my 95.....and soon as i hit it my speed instantly dropped.........i could'nt reach 120 either.......i was on the highway with no cars and no cops........i was racing my friend on the highway, and i was going to gun it to the top.......like i said i only went to 115 but it was still fun tho!