xrglen

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..

brenx

my guess would be the rims/tyres.

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XB Fairmont (street car) 11.07@123.02mph.

soverign

did you seal the scoop...
what were you trying to gain with the 5 lt of tolluen...

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?

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Old School Cortina: 9.87@138
The "other" car: 10.41@127

4vxc

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.

xrglen

auto c-4 with 5000 stall..

xw383

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.

xrglen

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

TruBlu351

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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XE Falcon
393 Tremec TKO 9"