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View Full Version : Why do our cars post low 0-60 times!



Dave B
24th February 2001, 18:53
Has anyone ever taken a turbo boost measurement while on a rolling road? The owner of the dyno that a lot of us in Holland go to, has said that not many cars get up past 1.1 Bar because the resistance of the rollers is not as much as on the open road. My car fuel cuts at 1.35 Bar which is 0.25 difference. This must be worth 25 BHP. Also every 1 degree celsius of inlet manifold temperature means 0.75 BHP. (I could be a bit wrong on this one but it has something to do with the way they calculate it in the DIN standard) Could it be that the real BHP figure could be up around 300 and that is the reason we can clock sub 5s times to 100 KM/h

MorayMackenzie
27th February 2001, 18:44
My car had a realistic 300 to 310bhp and posted sub 4 0-60mph... I suspect the good times are more to do with the light, efficient transmission system and the power delivery characteristics of the engine.

jack
1st March 2001, 13:30
We're forgetting the 4WD system that puts the power on the road so much more effectively than RWDs and FWDs....

Harj
1st March 2001, 15:21
I managed a 3.9 second 0-60 in mine http://bbs.22b.com/ubb/biggrin.gif

pat
2nd March 2001, 15:46
Harj,

you're not trying hard enough! LOL http://bbs.22b.com/ubb/wink.gif

I have a datalog showing a Scoob going from rest to 15MPH in 0.1 seconds! So that would make 0-60 in 0.4 seconds.... well, if that level of acceleration could be sustained http://bbs.22b.com/ubb/smile.gif

Cheers,

Pat.

Mark.A
2nd March 2001, 18:06
Pat,

Now take it off the axle stands, and try again http://bbs.22b.com/ubb/rolleyes.gif

pat
4th March 2001, 20:48
Mark,

the axle stand in this case was called the Rayleigh Weird, a big roundabout on top of the A127, this was a real datalog from a real road, but of course I don't believe it either http://bbs.22b.com/ubb/smile.gif I think it must've lit up the tyres and hence the vehicle speed sensor was reading higher than the actual speed. I guess that dumping the clutch with the engine at its torque peak of about 4500 RPM and running about 0.5 to 1 bar boost at the time would tend to break traction, applying about one thousand lb/ft to each wheel will certainly wanna make it go! http://bbs.22b.com/ubb/smile.gif

Cheers,

Pat.


[This message has been edited by pat (edited 04 March 2001).]

Danny Fisher
4th March 2001, 21:17
And then the engine went, yep you guessed it! BANG

Dan

pat
5th March 2001, 16:35
Danny,

Remarkably, the engine was, last night at least, still running! This must be a new record for me http://bbs.22b.com/ubb/wink.gif Just how long it will last is, of course, a different matter entirely!

Cheers,

Pat.

MorayMackenzie
5th March 2001, 17:54
jack,

No I wasn't forgetting that... see my post! http://bbs.22b.com/ubb/smile.gif

Moray