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Old 04-13-2003, 01:51   #1 (permalink)
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My 1/4 mile times, Gearing Opinions

Hey guys.

I have just returned form another day at Heathcoate Raceway. It was a fantastic day, racing against quite a few of my mates.... we all had a kik ass time.

I set out to improve my 60ft time this time round in the hope for a quicker overall result, I managed some good launches before the rain set in.

I was hoping to get some extra opinions for future gear ratio changes.

The last time I ran, I used standard street rubber 205x15.
This time around I used a lower profile tyre, softer compound.. and boy there was some good grip out there. It was a 205x15 50. The overall height of the rubber was about 1-1.5" less then the previous rubber.
This made the final drive shorter.

Here are some comparisons between the two.

My times are the following:

Standard Height / Lower profile
2.20/ 2.24 60ft
6.3/ 6.38 330ft
9.83/ 9.87 660ft
69.76/ 71.70 660mph
12.83/ 12.84 1000ft
15.365/ 15.365 ET
88.92/ 90.11 mph

temp 29.9/ 23.1



Standard Height / Lower profile
2.30/ 2.11 60ft
6.37/ 6.31 330ft
9.98/ 9.85 660ft
69.25/ 71.13 660mph
12.87/ 12.86 1000ft
15.44/ 15.40 ET
85.93/ 89.37 mph

Standard Height / Lower profile
2.18 60ft
x/ 6.4 330ft
x/ 9.9 660ft
x/ 69.67 660mph
x/ 12.92 1000ft
x/ 15.45 ET
x/ 88.95 mph

Standard Height / Lower profile
2.35/ 2.32 60ft
6.4/ 6.4 330ft
10.02/ 10.0 660ft
70.08/ 69.61 660mph
13.006/ 13.005 1000ft
15.50/ 15.55 ET
89.96/ 88.22 mph

The lower 60ft time did not seem to help as much as I thought it would.
All gear changes were done at the same point.. however, I was probably changing slower today (ie. Lower profile runs) as my main focus was getting a good 60ft time, without destroying my T5. Engine/weight the same on both days.

The car is an EA Ghia, full electrics, LPG etc nice and heavy.
It is a 5 speed, with a 3.23 final drive.

Do you guys think the car will be better off with a higher set of gears (assuming traction off the line is not as issue) Im thinking 3.7s?

Opinions?
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Old 04-13-2003, 02:06   #2 (permalink)
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I think the main aim might be avoiding having to change into 5th gear - ie being close to the redline in 4th as you cross the finish line. I have no idea which ratio would achieve this.
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Old 04-13-2003, 02:09   #3 (permalink)
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I'm currently just at the start of 4th gear as I pass the line... but will not make it across in 3rd.

I guess that would be ideal JT.. but I still need to drive it on the street. I would probably need 4.11 or 4.5's to do that.
A little too high for me... 3.7 is the limit.
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Old 04-13-2003, 08:29   #4 (permalink)
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Old 04-13-2003, 20:02   #5 (permalink)
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With the standard height tyres, you will be just able to cross the line in 3rd, max speed you can do would be 92mph@5500rpm. If you had the 4L Gearbox you could easily do it as it has a taller 3rd. (100mph in 3rd with 3.23 diff and 205/65/15)
I dont think swapping to a shorter diff is going to better your times much, since you still going to have to change into 4th.

Try keeping it in 3rd in your current spec, it will drop into the 14s. At worst you may hit the limiter once or twice before you cross the line, but that still wont slow it down as much as changing gear.

Finding a 4L box would be your best bet though....
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Old 04-14-2003, 00:49   #6 (permalink)
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He already has the 4.0 box.
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Old 04-14-2003, 01:34   #7 (permalink)
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Quote:
Originally posted by Jack_Travis
He already has the 4.0 box.
Hey JT, I have recently found out that I actually have the EA box.. rather then the 4.0 box like I had originally thought. Turns out that the two speedos I checked my car against were also out.... bloody Holdens
I found this out after I had the speedo checked properly.
Oh well.. im not bothered by it.

I think you are right now that I think about it Martin. I could probably cross the line in 3rd with the standard height.. I should have given it a go. The only thing is I can manage a good 60ft time with the smaller rubber.. mainly due to it's compound. I think with a few more rpm, I could get a 60ft of 2.0.. possibly 1.9.

Do the XRs with the 3.45s make it across in 3rd?
Ahh.. I dunno.. gearing is a hard decision.
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Old 04-14-2003, 02:29   #8 (permalink)
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Quote:
Originally posted by Bass Crazy
Hey JT, I have recently found out that I actually have the EA box.. rather then the 4.0 box like I had originally thought. I found this out after I had the speedo checked properly.
To find out which box you have, just do a given speed in fourth and then compare the rev drop in fifth at the same speed as a percentage. The percentage is your overdrive ratio. It will be one of five numbers, although two are too close to pick.
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Old 04-14-2003, 03:25   #9 (permalink)
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hey simon can i ask u what mods u have done to the 3.9?

thanks
matt.
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Old 04-14-2003, 03:31   #10 (permalink)
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3.7 would be a LOWER diff ratio then 3.23 and it would definitly accelarate faster, the fact you have to make an extra gear change might make a different JUST to the 400m time but would be quicker to 350m or 450m......but of course the freeway fuel comsumption would be a little higher due to higher rpm....of course if the ratio is too short ie 3.9 or 4.11 traction would become a major problem....if I were you I'd get a 3.45 or 3.55 with a nice tight LSD, that would a good around ratio....

There is alot more too it then that but that should be enough to get you through....

Dave.
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