Can't get me head round it....again

Anonymous · Post by **Anonymous** » Wed Mar 26, 08 2:46 pm

If the motor manages a trap speed capable of say a low 11 , why does it cover the 1/4 mile a second slower?

I realise the problem in my case , but if the speed is there , why can't you get the ETs , regardless of any problems.

Maybe a silly question , but i don't know.

Dave-R · Post by **Dave-R** » Wed Mar 26, 08 3:05 pm

MPH is an indication of the power you are making at the rear wheels.

ET is an indication of how much power you are transferring from the wheels to the track.

Also it assumes you are not bogging off the line or running out of fuel at the top end.

Anonymous · Post by **Anonymous** » Wed Mar 26, 08 3:16 pm

Great answer Dave.

Pete · Post by **Pete** » Wed Mar 26, 08 4:59 pm

As ever, what are yout 60ft times and your MPH over the quarter?

Kev · Post by **Kev** » Wed Mar 26, 08 5:18 pm

1.591 + 112.88 = 11.722

or
1.570 + 111.42 = 11.850

Anonymous · Post by **Anonymous** » Wed Mar 26, 08 6:28 pm

Dave wrote:MPH is an indication of the power you are making at the rear wheels.

ET is an indication of how much power you are transferring from the wheels to the track.

Also it assumes you are not bogging off the line or running out of fuel at the top end.

Dave, now you mention that, if running out of fuel at the top end equates to the car screaming at 7,000rpm across the line.....does it not also find itself under the same conditions at the top of each gear change too, assuming we're shifting at the same rpm we cross the line? ....I'll just go and fill me glass again while I wait for enlightenment!

Pete · Post by **Pete** » Wed Mar 26, 08 7:01 pm

I don't think Adam/Brutus gold is pulling that kind of rpm.

The Sox was indeed pulling 7K; and will be designed to do so again.

Julies car with the low HP motor could not pull above 6400 at the traps even though it was running 1.5 second 60 foot times as it just did not produce the power to do so (in support of Dave's point above). Would only manage 117mph.

The Sox had rubbish 60 foot times due to a convertor mis-match and dirt in the carb; but had the hp to pull 130 mph terminal speed. This is how it ran 1 second quicker than Julie's car.

The trick is to get a great 60 foot time AND have the ability to pull the desired rpm at the traps.

Anonymous · Post by **Anonymous** » Wed Mar 26, 08 7:16 pm

This was'nt a thread to bore you with my ETs , as it has a thread on it's own.

Anyhow , trap speed 119.7 , 60 foot 1.8 , RPM 5000 , you know the rest.

Ps , bit of gas used.

Pete · Post by **Pete** » Wed Mar 26, 08 7:30 pm

That's pretty good - you need a set of 4.30's or 4.56's in there

Kev · Post by **Kev** » Wed Mar 26, 08 7:31 pm

Don't forget to factor in the Gay'Vendors!! 4.88s

!!

Pete · Post by **Pete** » Wed Mar 26, 08 7:33 pm

I'll see your 4.88's and raise you a 5.12

Anonymous · Post by **Anonymous** » Wed Mar 26, 08 7:36 pm

Gay 4:10s , with vendors.

Pete · Post by **Pete** » Wed Mar 26, 08 7:37 pm

Tyre height?

28" at a guess

Anonymous · Post by **Anonymous** » Wed Mar 26, 08 7:38 pm

Pete wrote:Tyre height?

28" at a guess

Pete · Post by **Pete** » Wed Mar 26, 08 7:40 pm

I was running 4.10's and 28" tall tyres, so (as ever) it has got to be down to weight. Sorting your fuel will give you a fighting chance.

I would love to see how that car would go with a set of Johhny mental gears in it