Chassis Dyno/Weight/Mph comparisons

dangerous 23 Windows of Awesome

5,901 posts · joined Jan 2005 · 4 Oct 2005, 7:30 pm

#414329

I am interested to know who has chassis dynoed their car
and then taken it to the drags and got a MPH.
It is going to take some people to guess their weight I guess.
My car weighed 830kg and ran 114.77mph and with that combo,
had 177hp@6200 at the wheels, corrected for temp of 22 degrees C.
(no other corection data used on this dyno).
More fuel system tuning improved that to 188hp@6700.What will it run?

[ Edited on 4-10-2005 by dangerous ]

westi wrote:That's mad Alan.

speedster356 Plastic not Classic Racing

1,624 posts · joined Aug 2002 · 4 Oct 2005, 8:44 pm

#414365

Latest dyno run was 238HP @ rw/6200 rpm and the following Wednesday a best of 11.6 @ 125 MPH.
780 kg race weight, that's 1/2 fuel and me @ 69 kgs.
The drag coefficent of the Spyder is quite low as compared to a beetle, somewhere between 0.290 and 0.310

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Spyder-WISD 07-09-05 11.6s @ 125 MPH

Speedster-WISD Nats 05 14.4s @ 89 MPH

Jet cruiser-Coogee 22-09-05 900 deg C @ 110,000 rpm

Weaseling out of things is what separates us from the animals....................Except the Weasel.

jvl054 Wolfsburg Wizard

403 posts · joined May 2005 · 4 Oct 2005, 9:02 pm

#414377

speedster356 wrote:Latest dyno run was 238HP @ rw/6200 rpm and the following Wednesday a best of 11.6 @ 125 MPH.
780 kg race weight, that's 1/2 fuel and me @ 69 kgs.
The drag coefficent of the Spyder is quite low as compared to a beetle, somewhere between 0.290 and 0.310

Hi Speedster! thats impressive, keep up the good work...JVLRacing:thumb

bat69 There is no status

791 posts · joined Apr 2005 · 4 Oct 2005, 9:34 pm

#414395

Pete that thing of yours is a dead set weapon. I was just watching the DVD of your car doing the Hillclimb at Bulahdelah smoking the tyres on the straights at 130kph. .... ...........Very Impressive!

White Knuckle Racing Team [/i]
"Drive it like dirt"

dangerous 23 Windows of Awesome

5,901 posts · joined Jan 2005 · 5 Oct 2005, 8:25 pm

#414621

Anyone else?

westi wrote:That's mad Alan.

dangerous 23 Windows of Awesome

5,901 posts · joined Jan 2005 · 17 Oct 2005, 6:25 pm

#418533

Well, I guess the weather has more to do with it than I thought, because the ET was way- better but the MPH was not as good as my best(but close).Half track was better though.
Although, by the track weather station, the difference between my two best MPH's was about 1500ft of relative altitude.
I will keep plugging away to optimise the combo.

westi wrote:That's mad Alan.

dangerous 23 Windows of Awesome

5,901 posts · joined Jan 2005 · 29 Oct 2005, 4:58 pm

#422761

Hey Pete, what revs were you shifting at with that 6200rpm peak?
What tyres and transaxle?

westi wrote:That's mad Alan.

dangerous 23 Windows of Awesome

5,901 posts · joined Jan 2005 · 29 Oct 2005, 5:30 pm

#422768

From the few examples that I have info for,
you can add around 12% and then us the formula to calculate the speed you will run
at the track.

MPH=234 X cubed root of (HP divided lbs)

So if your car weighed say 1850lbs(841kg)
and you made 143 wheel HP (160 engine)
it equals 103.5 mph ....depending on weather.
Anyone tried this info?

westi wrote:That's mad Alan.

dangerous 23 Windows of Awesome

5,901 posts · joined Jan 2005 · 26 Feb 2006, 7:47 pm

#459325

Latest run with 188rwhp shows about 215 to 220fwhp with the formula.
This is with 1807lbs and 115.95mph.

westi wrote:That's mad Alan.

dangerous 23 Windows of Awesome

5,901 posts · joined Jan 2005 · 11 Apr 2006, 6:51 am

#474399

This one Herman.

westi wrote:That's mad Alan.

Adolph Commited Dubber

69 posts · joined Mar 2005 · 11 Apr 2006, 8:22 am

#474425

Thanx

Hermann

2000cc turbo type 4, dragster (325Kw)
2714cc no turbo, no gas, street bug (140Kw)