best way for 0 to 60 sprint

[G Man]

pb3 said:

No offence intended G Man but this is a little like F1 (over the last couple of seasons anyway), you are Ferrari and we are the others! We are playing catch-up. So when you (Richard) achieved the original record what gearbox did you have in your car and did it have “standard” gear ratios and final drive. I must admit I thought you had a G50/??, but all the info I can find suggests it would not allow you to get to let alone past 60mph in 1st gear. So it must be a Getrag 6 speed with what gear ratios? I have been looking at alternative gear ratios for my G50/00 box, but this looks like it will all get very expensive by the time they are fitted so I am stuck with: 1 gear = 44.002 MPH 2 gear = 74.797 MPH … 5 gear = 177.426 MPH Doh! Does anyone have experience of charging gears or the exact costs involved, PowerHaus II seem to have a huge range of ratios and would give much better results (on paper anyway)?

I run a 6 speed G50-21, only 1 gear is used to 60 and I never said it was 1st. My gearbox is completely Porsche standard.

G Man

[pb3]

Ok, I have come to the conclusion that gearing is not really the issue here. A G50/21 is not that different (at least 2nd gear anyway) so as Richard suggests there may be a throttle issue but more likely it is down to the driver (oh what, me). I have not had a great deal of experience with this sort of performance and I hope you agree it does take practice to make best use of the machinery we have. So 2nd gear is the place to be so no time is lost due to a gear change and hitting full throttle as soon after launching is the mission. What sort of revs are we talking about when the clutch is dumped (or released to give a little slip)?

[tuxman]

what we realy need is someone from the factory to come down on the 25th and support us and show us how it is done !!!! would be a good p r exercise for the factory . i for one would enjoy the support .simon

[andygtt]

my times were accuratelly independantly timed with £3K racelogic and on rubbish surface with Old hard GRB 315's (ie not STD sticky 335 F1's) it did 3.7's with a 0.4's gearchange at 58mph. All with me driving.

Although my car did have a modded porsche box to allow the 60mph 1st and 100mph 2nd.

What I will say is that I was a second faster to 100mph (all in the 0-60time) than the race driver who was also there to help time the cars... and I understand this guy currently holds the record for the Nurburgring in a radical and held the record for the 0-100-0 before Ultima took it from him.

So I suspect your car also has the performance there waiting to be tapped.

[B1 ECC]

I might add, that Andy, has no mechanical sympathy whatsoever! Right Andy?

[andygtt]

Ian is right with a very good point.

My launch technique changed depending on grip.... at the pod I would lay on 4000rpm and drop the clutch while holding the throttle steady and once grip comes floor it.
With my 3.7's run I had to launch at 2-2500rpm otherwise it would just not stop spinning both wheels (BTW an LSD will make a big difference on launch).

I doubt this would work with different gearing as I suspect a lower gear will just light up regardless and a higher gear (ie 2nd) will be much harder to hook up this way.

May sound obvious but you want full throttle with no wheelspin as soon as possible, judging when is the bit thats hard!


BTW when I first built my car I discovered I had this throttle not opening all the way without realising it, so very good idea to check this.