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post #1 of 9 (permalink) Old 03-30-06, 07:36 AM Thread Starter
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60" time

why would my 60" time increase but my 1/4 mile time drop??
just ran the XE ESP again at kwinana last night and ran a 11.66@117.95mph with a 1.758 60" time. BUT 3 months ago i ran a 11.86@113.49mph with a 1.631 60" time. the changes to the car were;;;
1) mr gasket electric water pump drive..
2) dropped rear mufflers, still two under mid way..
3) fitted bonnet scoop..
4) added 5 lt tolluen to fuel..
5) changed slicks from 7 in rims to 8 in rims. extra .5 inch hight..
car weighs 3660lbs with 2V 383c roller cam 750 dominator and 5000 stall with 4.56 9in diff.
there was no wheel spin and i was still going over the line at 7000rpm..
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post #2 of 9 (permalink) Old 03-30-06, 02:55 PM
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Re: 60" time

my guess would be the rims/tyres.

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post #3 of 9 (permalink) Old 03-30-06, 04:16 PM
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Re: 60" time

did you seal the scoop...
what were you trying to gain with the 5 lt of tolluen...
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post #4 of 9 (permalink) Old 03-30-06, 07:17 PM
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Re: 60" time

It could be several things, from just plain inconsistency, to the bigger slicks pulling the engine down and bogging it. You have more MPH which is the most important indicator, so it should 60' harder.

Is it manual or auto?

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post #5 of 9 (permalink) Old 03-30-06, 10:28 PM
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Re: 60" time

probably a combination of a slight increase in tyre eight and losing 2 mufflers. My car used to to 1.63-1.66 with open headers but now with mufflers and pipes it does 1.59-1.62 60's.
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post #6 of 9 (permalink) Old 03-30-06, 11:06 PM Thread Starter
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Re: 60" time

Quote:
Originally Posted by Racer
It could be several things, from just plain inconsistency, to the bigger slicks pulling the engine down and bogging it. You have more MPH which is the most important indicator, so it should 60' harder.

Is it manual or auto?
auto c-4 with 5000 stall..
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post #7 of 9 (permalink) Old 03-30-06, 11:28 PM
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Re: 60" time

What were your 1/8 mile times? I agree with tyres but the track conditions, time of day, it can also be how long you did your burnout can have an effect. This is where you can nail the cause or try finding it for years.
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post #8 of 9 (permalink) Old 03-31-06, 03:12 AM Thread Starter
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Re: 60" time

of 8 runs the 1/8 times were 7.49-7.53.
temp was 23.5-25 dergees
carb is 3 inches out of the bonnet so sealing the large style pro scoop wont do much.
tolluen was added to increase octane as i have high kicker pistons.
all burn outs were, spin for 3 seconds in top and then move forward until they hookup. cheers
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post #9 of 9 (permalink) Old 03-31-06, 06:13 AM
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Re: 60" time

You're obviously making more power with 1/2 your pipes off and perhaps with more timing running the toluene.

So you're getting out the hole a tad slower (for what ever reason), but you're making up a crap load down the track due to more power/torque....as already indicated by higher mph...and lower et's

Could try playing with tyre pressures to improve 60ft etc.

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