Dodge Viper GTS on the rollers

[stevieturbo]

Pumaracing said:

What were the gear ratios on that 2008 run?

Almost same overall gearing as more recent road tyre runs,

1st thru 4th

2.66
1.78
1.3
1

Diff 3.55, but this time with a 26" tyre as they call it in the US, ie 26" diameter

ET Street 26", 11.5" wide on a 16" rim. Mickey T seem to state 26.2" overall diameter for this.

Running around 12-15psi, not sure what the actual diameter would be in use.

http://www.mickeythompsontires.com/strip.php?item=...

[Pumaracing]

OK, I've dialed all that in. I get about 900 flywheel bhp back in 2008 so about 50 off the simulation I did on the previous page.

[stevieturbo]

Pumaracing said:

OK, I've dialed all that in. I get about 900 flywheel bhp back in 2008 so about 50 off the simulation I did on the previous page.

It was never on a dyno around that time ( not that I'd believe the dyno number anyway lol ), but the figure doesnt sounds unreasonable. Engine itself probably making a little more, but then the blower would eat a fair whack of it before it goes anywhere else.

[Pumaracing]

Has it ever been on a dyno then and if so what was the engine spec and power curve?

[stevieturbo]

Pumaracing said:

Has it ever been on a dyno then and if so what was the engine spec and power curve?

It's only been on a dyno 3 times.

Twice Dynapack, and once Dyno Dynamics. All different specs, and none same as the runs posted, so cant really see any of them being relevant.
Plus the Dynapack numbers would seem more than a tad high vs reality, especially as the 2nd time car had a big misfire at the time

[Pumaracing]

No worries. Anyway the computer simulation is actually more accurate than a dyno if the weight and gearing are known precisely.

Here is your 2008 run on the gearing you stated. I've left 5th as the 0.74 you previously mentioned. Dunno if that's correct.

60ft - 1.62 @ 50.5
220 yards - 6.39 @ 117.3 (115.2 @ 210 yards)
440 yards - 9.84 @ 146.1 (145.0 @ 430 yards)
880 yards - 15.43 @ 174.0 (173.5 @ 870 yards)
1 mile - 24.91 @ 202.0

I've also given you the 10 yards less mph from how I think drag strip timing gear averages things.

In practice you hit the 60 ft mark a bit quicker than simulated because of stored flywheel energy dumped into the vehicle when you drop the clutch. I don't simulate that but might add it in one day.

Seems you can just crack 200 mph in the standing mile which is nice with those aerodynamics. 202 mph to be exact. Probably a smidge less on actual timing equipment however that works but somewhere between 201.8 and 202.0.

Edited by Pumaracing on Tuesday 16th June 13:21

[stevieturbo]

Going to reply in the other thread as it's more relevant than this thread title

[chuntington101]

stevieturbo said:

Going to reply in the other thread as it's more relevant than this thread title

Good idea Steve. I keep hoping that Carl or someone else has posted a vid of the 1000BHP or even better the 1500BHP run of this car.