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Was the track temps going way up from first to last run? The 60 ft. times varing that much and the 1/4 mile ET and MPH not changing the same or more amount has me wondering How about trying a low low gear set

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I think the track temps were fairly consistent.
Time of runs were
3:06pm
3:35pm
3:57pm

One note is that this was a street legal day, so starting line conditions weren't great.

First two runs were in the left lane (which they were prepping a bit for me before my runs by putting down that powder, I'm assuming rubber, and spraying) and the last was in the right lane which they didn't prep. Also, I upped the two-step to 5000 on the last hit as well.

Don't know why the ET's could be so consistent when the 60's were so far apart.

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1/4 mile mph seems high for ET
1/8 mile mph seems low compared to 1/4 mph, 27mph increase

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I agree! It looks like something is wrong. I would expect you engine to push your car to at least 110mph. in the 1/8...

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1/4 mile mph seems high for ET
1/8 mile mph seems low compared to 1/4 mph, 27mph increase

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I agree! It looks like something is wrong. I would expect you engine to push your car to at least 110mph. in the 1/8...

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thats how my car acted with the sheetmetal ram on it

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I feel your 60 ft. numbers are almost perfect for your ET and MPH. Perfect IMO would be 60fts. around the 1.39 1.40 range. With your 1.44 you have darn near, perfect numbers for the run IMO.

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I'd actually expect it to be quite a bit quicker, based on my own car pulling 1.459+ 60-fts. w/a much milder combination on only 275/60R15 DOT drag radials. "G" has 7 MPH more than me, but his 60-ft. times are pretty soft for the power level he's making.

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Ok, here’s my story as to not hi-jack the other thread….

Very similar to his story.

67 coronet, 3580 race weight (all-in).
Backhalved, pro-street 4 link (urethane-bushed rod ends), single adjustable Vari-shocks.
Dana, spool, 4.56, 32.2” tall Phoenix slick (radial) – 32-13.6-15
Launching off a brake with two-step at 4800
Shift light set at 6400 (probably shifting at 6500 or so)

Last time out went
60 ft ---- ET ---- MPH
1.440 - 10.139 - 133.37
1.458 - 10.139 - 133.54
1.477 - 10.141 - 133.54

8” converter, flashes 5800
7000 rpm through the traps (hit the rev limiter with a 7000 pill right at the traps all three runs)
Slip calcs out a little over 10%

On the engine dyno, motor made peak TQ at 5000, peak HP at 6500

1/8th mile times on the above runs were:
6.462 @ 106.47
6.470 @ 106.70
6.484 @ 106.87

So, based on where the peak HP and TQ numbers are, what kind of flash range should I be looking for to get the best 60’ times?

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For your MPH it should be running 10.0, I think
your stall is too high and your spending too much
time below the stall at the shift points, I believe
that is also giving you the 10% slippage(which if
you could go higher in the revs it wouldnt be that
much slippage)... your going through the traps right
at the right RPM(10% above peak HP RPM). I try to
shift AT LEAST 1500 rpm above the stall point your
shifting 700 rpm above stall.... what is you drop
in rpm's between gears

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Each combo is different, but I am a fan of loose. I picked up about .05 going to a much looser converter, 6400+rpm compared to 5500rpm before in front of a 528 BB with peak torque at 5100 rpm. Each combo will differ, and those chasing the best ET will have more than one converter to test.
For what it is worth, a loose converter will have less hit in the first few feet, but average better to the 60 ft clocks. If you have a situation like mine, too much launch torque, then loose makes more sense. Especially if there is spin off the line, which starts the lockup process early and decreases torque output to the input shaft. If you are allready way above max torque, it only gets better with a little slippage. Check out how the ET falls off on a car with a tight converter (roughly at or below peak torque for flash) when they experience slippage at the line.

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I don't think 5800 is going to hurt the 60'. it being on the rev limiter at the the end may be though.

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Ok, here’s my story as to not hi-jack the other thread….

Very similar to his story.

67 coronet, 3580 race weight (all-in).
Backhalved, pro-street 4 link (urethane-bushed rod ends), single adjustable Vari-shocks.
Dana, spool, 4.56, 32.2” tall Phoenix slick (radial) – 32-13.6-15
Launching off a brake with two-step at 4800
Shift light set at 6400 (probably shifting at 6500 or so)

Last time out went
60 ft ---- ET ---- MPH
1.440 - 10.139 - 133.37
1.458 - 10.139 - 133.54
1.477 - 10.141 - 133.54

8” converter, flashes 5800
7000 rpm through the traps (hit the rev limiter with a 7000 pill right at the traps all three runs)
Slip calcs out a little over 10%

On the engine dyno, motor made peak TQ at 5000, peak HP at 6500

1/8th mile times on the above runs were:
6.462 @ 106.47
6.470 @ 106.70
6.484 @ 106.87

So, based on where the peak HP and TQ numbers are, what kind of flash range should I be looking for to get the best 60’ times?

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For your MPH it should be running 10.0, I think
your stall is too high and your spending too much
time below the stall at the shift points, I believe
that is also giving you the 10% slippage(which if
you could go higher in the revs it wouldnt be that
much slippage)... your going through the traps right
at the right RPM(10% above peak HP RPM). I try to
shift AT LEAST 1500 rpm above the stall point your
shifting 700 rpm above stall.... what is you drop
in rpm's between gears

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thats kinda exactly what i thought... i have a hard time believing a car that is shifted 700 rpm above the convertors flash is ever going to run as good as it can. That 1500 rpm spread seems like a very good general rule to me, and i know its way closer to optimal than 700 is.

My thought is that torque is what gets a car moving(especially, like in the OP's case its an almost 3600 pound car). my guess is that the closer the convertor flashes to the cars torque peak,(optimally just a hair over) the better the car is going to launch and the better its going to accelerate at gear changes, assuming he can get the power hooked up.

I suspect this is why in this cars case the 60 foot is soft and the 1/8 mile times are as well.

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Does your car have tire slippage at launch?

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If you have worse spin off idle than using the brake, sounds like your suspension needs some serious loosening up. Anyone else care to comment?

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I cant leave from idle either... I believe it slaps
the converter too hard and blows the tires off...
if I leave at high rpm's it hooks

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My experience has been that with my car, off idle gave better traction due to time for the suspension to react. A transbrake is like dropping a clutch, shocks the suspension and might overcome too stiff of a setup. Just my opinion, because our cars are so different. More input should shed some light on this situation. How stiff are your springs? Shocks?

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My springs are 90# and my QA-1s are set at 9(12 total)
with a 4-link