DarkCloud

I searched the forum, and google a bit for what my 99 SS should top out at, and found on a site that 155 is the top speed... i dont see how that is true, i hit 140 last night, and was only at about 3000 rpms in sixth gear? when does the speed limiter kick in??? and how fast will the car go with out the speed limiter? it has to be able to get at least 170 right??

RPM WS6

iTrader: (3)

I'm pretty sure I remeber reading many years back that the factory speed limiter is set to 163mph from the factory with Z-rated tires.

rk_2000_Z/28

iTrader: (3)

Yeah, when I had the stock 3.42s in I hit 155. I was right at red-line in 5th gear, and still had 6th to go, but the Speedo only goes to 155 so I shut it down after that. I've seen other places that it is around 162-163

DaGeneral

iTrader: (3)

Isnt max speed reached in 5th gear anyways?

Iron Sights

Speed limiter is at 162 if your car came with Z-rated tires (you obviously have them since your car did not stop at 118).

fuseone

so thats how you can tell if they came with z rated tires if it goes over 118

StealthZ06

iTrader: (1)

Like the others have said it's right around 162-163 mph. I've personally tested that out.

JDJP

iTrader: (2)

Thats what I was thinking, I always thought 6th was just for cruising, I think its hard on the tranny going that fast in 6th?

spazzyfry123

iTrader: (4)

But what if you have steeper gears? Theoretically, you will reach a higher top speed with 3.42's than you would with, let's say, 4.11's. But with the 4.11's, wouldn't that put less strain on your motor/trany and allow you to reach a higher speed?

I ask because I now have 4.11's, and my car pulls hella hard in sixth compared to the original 3.42's...

Also, what about the 'Vettes? Are the speed limiters raised in them? We used to have a '99 convertible, and we had it up to 165 with the top down. At that point, it was like an F5 tornado, so we had to shut down. We never did it again due to how scary it was with the top down, so we never reached the limiter. It was an A4 by the way...

Cop Car

iTrader: (14)

stock speed limiter on an A4 or M6 with Z rated tires is 160mph.

without z rated, its at something like 120

Jassick

iTrader: (1)

with steeper gears you get to your power band quicker. it also lowers your top speed. look at where first/second/even third gear runs out now compared to where it was stock.

and yes top speed is usually done in fifth gear. sixth is for cruising. at least that's what i've always read on here.


if i remember correctly the areodynamics of a f-body limits it to about 170, unless you have enough power to push through it. and it will take quite a while to get that fast.

gi8e7oi825

iTrader: (32)

My car came with Z-rated tires... it was electronically governed to 160mph.
I've never driven that fast, but that's what I see here:

DaGeneral

iTrader: (3)

Fastest I've done was 150 MPH in 5th gear.

Sunset'01Z

iTrader: (10)

i've gone over 155 in my z28 a4 2.73 and i didnt shift into 4th, granted it took too long to get there lol.

WS6 Rampage

iTrader: (3)

I reflashed mine and manually set my speed limiter up to 170. Apparently 170 is the max for an f-body ls1.

kars10_4

I've had mine going 160mph in 5th with 3.42s, felt like it had a little more but I was also running out of rpm. The fastest mine will go is 122mph in 6th, just doesn't have the power to push the car faster with that 0.5:1 6th gear.

ls1charged

iTrader: (8)

only one way to find out how fast YOURS will go.

BLK02TA

iTrader: (11)

Been to 135 on my 245/50/16's (5th) thanks to tuning. Dont think I'll go any higher than that unless I get better wheels/tires.

djsanchez2

iTrader: (14)

I've been to the limiter when i had my 2.73's, just past the end of the speedo. Now it will only do 135 in 3rd w/ the 3.42's. There are some guys who do open road racing on here, can't remember their screen names though. I'm sure they would know.

Arctic2002ss

Yeah, you can't do it in 6th. Just too tall of a gear unless you have major mods. Not sure how 4.11s would change that though.

As others have said, the speed limiter is around 162. With that removed, maybe 170 at red line(in 5th). I've been close to 160 myself.