WillErickson

Guys, keep in mind that speedometers are notoriously inaccurate at these speeds, Car and Driver did a test a few years ago in which they compared car's speedometer indicated speed with a that of a radar gun. Most of the car's were 10 mph higher according to their speedo's at top speed than actual. A Porsche 911 showed 202 mph, while travelling at 181. The only exception was a Dodge Viper, which indicated 184 mph, but was travelling 186.

Will

20withan8

Put the car on a stand, and take the dsc off. Then see how fast it goes. LMAO.

HiTMaNN

I highly doubt you got 140 mph in your auto 8. Its a load of bull all the 8s in bc went for a huge drive i got up to 186KM/h with a picture and that was downhill it just wouldnt go further so without proof i dont believe you!~

Aseras

welp i've had my car for almost 2 months now ( 3700 miles... ). it's a 6mt. it'll get to 140 in a heartbeat. 140+ start to slow down but i've easily gotten her 160+ in about 1 mile. I didn't really feel like going too much faster as almost 170 in a 55 is not a good thing but highway 60 at 2am on a sunday is pretty dead.. not a car for 20 miles in either direction and it's a straightline for 10-20 segments and it's florida so it's flat and you can see 3-4 miles.

She went about 137 at redline in 4th and about 155 redline in 5th.

my10ae

I have personally and easily I might add gone over 125MPH in my 8. Don't rmember the RPM range I was in but I know she had much more in her as I had to slow down. Again this was done at night with no one else on the road and a nice long open stretch of open highway. I am sure the 4-port 8's can easily reach 140MPH. Now can anyone prove it, that's the question... :D

khtm

This is in an AT?

There was a guy on here that swore his was limited to 125...he even said he had a video of it...

my10ae

Yes I have the 4-port auto. Not sure if having a CZ unit tuned and installed in my 8 let me reach that speed and then some, but I know how fast I was going at the time and knew I had to slow down quickly for a sweeping left-hand turn. I got to 125MPH with no issues. I do have a CZ unit, Typhoon intake and Borla exhaust. Take it for what its worth, but I know "my" auto 8 can do 125+

Ajax

The current impression is that neither car is limited at top speed as far as the computer goes. They're only limited in a horsepower vs drag and transmission situation.

Eventually you reach the maximum speed that the car can obtain vs the gearing on the transmission.

Diabolical RX8

Ok I have an 2004 Auto RX8.

Top Speed is "LIMITED" by the "GOVERNOR" to "125 MPH".

Everytime I hit 125mph my car shuts off till it hits 120mph then it comes back on.

For the 2003's it might be different. But I dont really know since I have only been in mine.

my10ae

My 8 is also a 2004 model. There were no 2003 RX-8's. Model year started in 2004 for the 8. Mine was bought in 2003 as a 2004 model. As I said I have a CZ unit, K&N intake, and Borla exhaust and I can def go over 125MPH in my auto. :D

Diabolical RX8

Yeah same here a Stock AT RX8 can definately hit over 125mph I wouldnt doubt 135mph. But it just might take some long stretch of road.

DreRX8

I've touched 125 and mine didn't cut out.

thuneon

my 5-speed runs 150mph.

Emsdad

^^^5-speed?

thuneon

Yeah, the 4 port RX8 in Europe has an 5-speed manual gearbox instead of your automatic.

Emsdad

You learn something new everyday...had no idea that there was a 5-speed available.

Cool, thanks!

CaptainZoom

I have got a 192 hp 5 spd MT.
It was able to do 229 km/h(142 mph) on the Autobahn.
Maybe its faster now with more km's on the tacho..

my10ae

CaptinaZoom:


What gear where you in? I have a feeling it was 4th.

sohcpunk

I'm pretty sure there a speed limiter on the US 4 port versions. I was traveling to vegas and constantly flooring the car and it did not hit over 125mph. I was stepping on the throttle for a good 1 min and it did not once hit 125. I have an HKS exhaust. I think the rpm around that range is 5500rpm? somewhere around that range.

Razz1

That's fadt enough. Go to the track.

whenson417

My car in 3rd gear topped out at 125mph on the dyno. Can't remember if I tried it in 4th but I would assume since I did a fully automatic run that it would have topped out in 4th as well and I can only remember reaching 125mph.

CaptainZoom

For the 5-spd MT the rev limiter stops you at 104 km/h i 2nd gear and 140 in third.
That's 65 and 87 mph..