help 1966 impala 1/4 mile run questions - Impala Tech
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post #1 of 5 (permalink) Old 10-17-2010, 08:10 PM Thread Starter
 
 
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help 1966 impala 1/4 mile run questions

i have a 1966 impala ss race weight is 4215 i have 3.73 gears 454 and a th400 i made five passes last friday i ran a /[email protected] 109 /12.42 @ 109/ 12.24 @109 / 12.36 @109/12.32 @ 109. and my question is why are all my runs at 109 mph?, am i lean or are the gears hurting my mph? the tires are 28"tall and i have a 3,200 stall converter.? help
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post #2 of 5 (permalink) Old 10-17-2010, 08:24 PM
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Speed is determined by horsepower, (you have 454 at the flywheel with what you are reporting). Your 367 horseppower at the rear wheels is probably over whelming your tires. Look at your 60 foot times to verify what you are doing on launch. The lower the number the better your ET as most drag races are won or lost in the first 60 foot.

Big Dave
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post #3 of 5 (permalink) Old 10-17-2010, 08:29 PM Thread Starter
 
 
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my 60' times are in the 1.775 range i do spin a little bit but i seen the difference in et but no mph difference. im know there is more potential in the car car im going through the traps at 5,200 rpm and my cam doesnt stop making power until 6500. im thinking about changing to a 4.10 rear
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post #4 of 5 (permalink) Old 10-17-2010, 09:00 PM
 
 
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Check your tire pressures also. If your rolling low tire pressures on the top end its like rolling a hacky sack and that will limit your top speed.
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post #5 of 5 (permalink) Old 10-18-2010, 02:17 PM
BA.
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Quote:
Originally Posted by Big Dave View Post
Speed is determined by horsepower, (you have 454 at the flywheel with what you are reporting). Your 367 horseppower at the rear wheels is probably over whelming your tires. Look at your 60 foot times to verify what you are doing on launch. The lower the number the better your ET as most drag races are won or lost in the first 60 foot.

Big Dave
I agree with Dave.

One other comment is that MPH don't lie in regards to what the HP is.
Your MPH is in the normal range for the ET you're running. The variance in ET is most definitely in your traction. (or internal clutch plate slippage)

I doubt you are running lean, but you would check the condition of your plugs to let you know if that is the case.

if you're going through the traps at 5200 then, yeah, you could say you're leaving a little bit on the table since the preference is to cross the traps at/near redline.
Just keep in mind that you already have traction inconsistency. If you go to 4.11 it will get worse unless you do something to improve your traction.

HOW A NOVICE REBUILDS A 66 IMPALA CONVERTIBLE:
http://www.impalas.net/forums/blog.php?u=1432

Last edited by BA.; 10-18-2010 at 03:37 PM.
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