Had fun tonight for my first time WSID 16/05/07

**xtercii** · 18-05-2007 05:00 PM

Good effort guys…how bad was ur wheel hopping problem Jeremy? Have you done anything previously to minimize it?

Ben did you have any wheel hopping issues?

**bennjamin** · 18-05-2007 05:13 PM

but fark me 14.1 with a trap speed of 99mph.. what was your 60ft?
thats a high trap speed

ehehe mine is stock ITR intake ~ and a EK4 muffler. Probably less that 141 at the fly lol
Anyway the trap speed was 99.6 mph , 2.3/4X60ft (i cant find the sheet)- i was almost dead even with a MPS on the final run ( he ran a 14.0XX)
BTW i had wheel hop issues yes - 1st run was shit. 2.6ish 60 ft , dropped the PSI alittle and then had a few tries. DRopped and rode the clutch at about 4.5 k , it bounced then bogged abit but didnt seem to slow down too much.
IT makes me think whether to do anything at all to the engine. From what ive seen any mods short of a full camshaft / new pistons / ECU are a waste of time.

**bennjamin** · 18-05-2007 05:27 PM

Originally Posted by claymore

All well and good but your graph is constant and doesn't allow for TIRE SLIPPAGE and a moving car is NOT AT A CONSTANT RATE OF SPEED. It is accelerating in a non-linear manner. Nice try though

dont forget gear ratios / wind resistance / weight blah blah.
Anyway im going with jeremy again in 2 weeks , anyone want to come with ?

**grumpy rooster** · 18-05-2007 05:55 PM

Generally, better 60ft times will result in lower mph for the same vehicle. You will hardly ever see a car run its highest trap speed and its quickest ET on the same run.

That has been demonstrated many times.

**sydteg21** · 18-05-2007 05:56 PM

Originally Posted by BlitZ

did you car bog down til like 3k?... just side step the farker at 5k rpm.. not the ebst but u wont bog eheheh

yeah man, everytime i have to rev from 3000rpm, apprantly i should double clutch it , but i didn;t , the third which i got 2.8, ****, i was in a rush, big wheel hop man, yeah, i hope will be better next time la, that's why i think i can increase the mph

**sydteg21** · 18-05-2007 05:58 PM

Originally Posted by bennjamin

I think the car is one of the lightest DC ive seen for a road car

still 100 kg heavier than yours , you bastard

**aaronng** · 18-05-2007 06:08 PM

Originally Posted by sydteg21

yeah man, everytime i have to rev from 3000rpm, apprantly i should double clutch it , but i didn;t , the third which i got 2.8, ****, i was in a rush, big wheel hop man, yeah, i hope will be better next time la, that's why i think i can increase the mph

Are you having trouble getting into 2nd? If not, no point double clutching as it is slower and only used for downshifting.

**sydteg21** · 18-05-2007 06:13 PM

Originally Posted by grumpy rooster

Generally, better 60ft times will result in lower mph for the same vehicle. You will hardly ever see a car run its highest trap speed and its quickest ET on the same run.

That has been demonstrated many times.

oh ok, maybe you are right , but from what ben has run, 14.8@92mph 60ft 2.6, 14.6@ 97mph 60ft 2.4 , 14.1* @99.* 60ft 2.2*, i don;t know why the trend goes that then

**sydteg21** · 18-05-2007 06:17 PM

Originally Posted by bennjamin

Sums it up. There isnt a accurate forumlae to work out the exact 1/4 mile time of a car as too many factors.
Lets work on our launches Jeremy !
I shoudl easy hit the 13 second STOCK club ehehe. Anyone here joining me ?

oopsss

**jdm_kid** · 18-05-2007 08:38 PM

wahhh wahh good time u guys !

**EG5** · 18-05-2007 09:09 PM

Originally Posted by sydteg21

yo, like other people said i'm a shit driver, it may take a long time but i promise you i will try as many times as i can to hit 13's with current set up, just give me a hand to lift the gearbox when i change clutch in the further ok?

Practice makes perfect

**ginganggooly** · 20-05-2007 12:11 PM

Originally Posted by claymore

All well and good but your graph is constant and doesn't allow for TIRE SLIPPAGE and a moving car is NOT AT A CONSTANT RATE OF ACCELERATION. It is accelerating in a non-linear manner. Nice try though

Nice try?

I never said, nor implied that acceleration was constant, however given scenario at hand, the rule does hold true, and accounts for the (normally) inverse relationship between trap speed and 60' times, all else being equal.

As was stated, it's a gross oversimplification.

I've seen it in my car, i've witnessed it in other cars, and I'm sure that others here have noticed the same thing. There is even a physics formula that backs the theory up...

Originally Posted by benjammin

dont forget gear ratios / wind resistance / weight blah blah.
Anyway im going with jeremy again in 2 weeks , anyone want to come with ?

These are constants, cars generally don't alter drag coefficients or gear ratios between runs, so for this discussion, they're irrelevent...