[belgianhead]

In this month's Road and Track magazine the top speed of the SS is listed as 175 mph. I've now heard 155, 162 and 175. How many top speed numbers does Chevrolet put out?

 

[thedarkside]

maybe the manual has a higher speed limiter than the automatic which was limited to 163?

 

[15SuperSport]

I can tell you first hand that it's somewhere above 160. I believe another member can confirm 163, maybe 164. I don't think these are all GM stated numbers. Maybe it changed for 2015, but I think it was 163 before.?.

 

[rjcalif]

where's Trey at.... didn't he hit 165 in his ? I haven't been near top speed yet, too many Prius' on the roads out here and not nearly enough missiles to take them all out.

 

[Pinetree]

My HUD gave 159 as the limit while the speedo was showing 160. That was on the slight downslope of the run. On the upslope it was 159/159.

My guess is the limit is actually 159 as the HUD said, but aero and terrain will allow a bit more under the right conditions like Trey experienced.

 

[stvmoe75]

My HUD gave 159 as the limit while the speedo was showing 160. That was on the slight downslope of the run. On the upslope it was 159/159.

My guess is the limit is actually 159 as the HUD said, but aero and terrain will allow a bit more under the right conditions like Trey experienced.

Did it shut down like hitting a programmed limit or did it feel like that's all it had?

 

[Treytaw]

164 is my top speed....all depends on what your rpm limit is set to in 5th...once you hit that redline, you are done...my previous was 158 and was on the same tune and everything as the 164

 

[Pinetree]

Did it shut down like hitting a programmed limit or did it feel like that's all it had?

It just stopped gaining speed. Not violent at all, just held that speed, and not at engine redline, so wasn't the rev limiter. Based on rpm, I calculate the top speed (in 5th gear) to be in the 170-175 range if the speed limiter weren't present.

 

[LaSS VegaSS]

So why did they tease us with a 180mph analog speedo?!?!?!

 

[willy92]

If you had a 160 mph speedo, like most of my previous cars, you couldn't read it once you got to 164, now could you(I know the digital and the HUD will still continue to register)? I had wished the had installed a 200 mph dial.

 

[15SuperSport]

So why did they tease us with a 180mph analog speedo?!?!?!

The car is "speed limited" not drag limited. With the right tune and the limiter turned off you might need the 180. War Baby, Whipple SS, Wkeylich, Headrat and others would need the dic or HUD, the analog needle would be pointed at their, uh. Feet.

 

[stvmoe75]

Does anybody really know how fast they're going?

Interesting find when reading up on the number of revolutions tires of the same size will turn per mile.
What I'm seeing for the stock rears:

Potenza S-04 784 rev-per-mile
Cont ExtremeContact DW 761 rev-per-mile
Dunlop SP Sport Maxx GT 787 rev-per-mile
Michelin Pilot Sport PS2 783 rev-per-mile

My guess is the Conti's are going to get you a higher top end...

:whatdoyouthink:

 

[CaptainDan]

Interesting find when reading up on the number of revolutions tires of the same size will turn per mile.
What I'm seeing for the stock rears:

Potenza S-04 784 rev-per-mile
Cont ExtremeContact DW 761 rev-per-mile
Dunlop SP Sport Maxx GT 787 rev-per-mile
Michelin Pilot Sport PS2 783 rev-per-mile

My guess is the Conti's are going to get you a higher top end...

:whatdoyouthink:

Keep in mind that the tire diameter gets larger as speed increases. Centrifugal force, ya know.

 

[stvmoe75]

Keep in mind that the tire diameter gets larger as speed increases. Centrifugal force, ya know.

At 160 those tires must barely fit in the wheel wells then......:biggrin:

 

[CaptainDan]

At 160 those tires must barely fit in the wheel wells then......:biggrin:

That's precisely how they (wheel wells) are designed. Car wheel openings, wheel wells, and liners are generally designed to clear a tire envelope that is calculated from "max growth" of the tire (due to speed and temperature). As well as suspension movement and steering angles.

 

[KWBaraka]

That's precisely how they (wheel wells) are designed. Car wheel openings, wheel wells, and liners are generally designed to clear a tire envelope......

.....and sometimes they're designed off what looks best on the car .

KW

 

[eli]

Is the SS speedo supposed to be accurate or is it supposd to read ~3% fast?

The reason I ask is that GTO speedo is designed to read about 3% fast:

On the 04-06 GTO if you push the mode or set button while starting, the dash goes into diagnostic mode where a tiny display shows the *real speed*.
The real speed is about 3% lower than the speed indicated by the speedo. using GPS and milemarkers/time to determine speed also indicates speedo reads a bit fast. Evidently this is by design - I asked the dealership to correct the speedo to indicate the real speed not 3% fast, and their response was "operating as designed".

 

[Mr Monte]

Pretty smooth at 160mph but not as smooth as my Challenger SRT8. The SRT8 displayed max speed on the bottom of the speedo. Mine was 173mph:biggrin:

 

[Treytaw]

Did it shut down like hitting a programmed limit or did it feel like that's all it had?

It just stopped gaining speed. Not violent at all, just held that speed, and not at engine redline, so wasn't the rev limiter. Based on rpm, I calculate the top speed (in 5th gear) to be in the 170-175 range if the speed limiter weren't present.

Mine was at redline both times...the 158mph previous and now the 164mph

 

[scammer]

not my pic.......

Not my driving, but its our speedo