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Re: Help me get my combo to 7.50 on the to 1/8
[Re: B3422W5]
#3162527
07/23/23 07:36 PM
07/23/23 07:36 PM
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Joined: Jan 2003
Posts: 12,085
Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,085
Benton, IL.
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But then, once the OP starts hitting the drive train and tires that much harder, he will need to do other things. Maybe a lot of other things.
Master, again and still
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Re: Help me get my combo to 7.50 on the to 1/8
[Re: DaveRS23]
#3162579
07/23/23 10:23 PM
07/23/23 10:23 PM
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Joined: Jan 2004
Posts: 8,271
fredericksburg,va
cudaman1969
master
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master
Joined: Jan 2004
Posts: 8,271
fredericksburg,va
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Converter and gears, my 64 all steel savoy with a 73 440 stock pistons, 509 cam, torker intake, 750 Holly, stock 452 heads, TA 3800 vert, 4.88 gears, 14/32 slicks ran 7.50s all day. My 60 was in the 1.60 range and run regular pump gas (8 to 1 ratio pistons) done at 5000 rpm.
Last edited by cudaman1969; 07/23/23 10:28 PM.
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Re: Help me get my combo to 7.50 on the to 1/8
[Re: cudaman1969]
#3162919
07/24/23 09:59 PM
07/24/23 09:59 PM
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Joined: Mar 2008
Posts: 553
Kentucky
clovis
mopar
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mopar
Joined: Mar 2008
Posts: 553
Kentucky
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As suggested above the Wallace Calculators are very helpful.
Here is are your target numbers
60 Foot 1.65
330 Foot 4.77
660 Foot 7.50
660 MPH 90.63
1000 Foot 9.87
1/4 Mile ET 11.89
1/4 Mile MPH 111.48
If you put your current best 1.80/7.99/84 one piece at a time into the ideal calculator you can begin to see a little of the picture.
At a 7.99 you should 60 - 1.76 and mph 85.07
At a 1.80 you should et 8.17 and mph 83.19
At 84 mph you should 60 - 1.78 and et 8.09
So your ET and mph are good for your 60 ft
However, you have a low enough ET you should 60 ft and MPH better.
At 3,800lbs you need about 400HP at the wheels to go 7.50, so with an automatic probably right at 500 at the crank (again as mentioned above). Based on your 7.99 at 3800lbs you would need about 85 more crank HP as you are making a little over 400 at the crank now. I would do a quick leak-down and compression test to see what you are starting with, once I knew I had a solid bottom, I would give Dwayne a call and have him spec you a cam. You didn't mention compression or rpm so those are big factors. Once you get a better feel for your power curve, you can gear and converter it to make it work together (as it is likely you will need more of both).
'75 Plymouth Duster
Phase I 451 906/590/2-660 10.75/126
Phase II 451 Stage VI/590/1050 9.82/135
Phase III 383 906/Victor-Pump gas 11.30/119
"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"
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Re: Help me get my combo to 7.50 on the to 1/8
[Re: clovis]
#3162953
07/25/23 04:50 AM
07/25/23 04:50 AM
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Joined: Jan 2003
Posts: 10,001
Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,001
Frostbitefalls MN (Rocky&Bullw...
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Do you have a cold air intake system of any sort? Collecter extensions? At least an 18 inch to 24 inch collecter on a car with a tight converter like you have. You didn't say how you ran the car. Open exhaust, or not?
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Help me get my combo to 7.50 on the to 1/8
[Re: clovis]
#3162984
07/25/23 09:33 AM
07/25/23 09:33 AM
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Joined: Jan 2003
Posts: 12,085
Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,085
Benton, IL.
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As suggested above the Wallace Calculators are very helpful.
Here is are your target numbers
60 Foot 1.65
330 Foot 4.77
660 Foot 7.50
660 MPH 90.63
1000 Foot 9.87
1/4 Mile ET 11.89
1/4 Mile MPH 111.48
If you put your current best 1.80/7.99/84 one piece at a time into the ideal calculator you can begin to see a little of the picture.
At a 7.99 you should 60 - 1.76 and mph 85.07
At a 1.80 you should et 8.17 and mph 83.19
At 84 mph you should 60 - 1.78 and et 8.09
So your ET and mph are good for your 60 ft
However, you have a low enough ET you should 60 ft and MPH better.
At 3,800lbs you need about 400HP at the wheels to go 7.50, so with an automatic probably right at 500 at the crank (again as mentioned above). Based on your 7.99 at 3800lbs you would need about 85 more crank HP as you are making a little over 400 at the crank now. I would do a quick leak-down and compression test to see what you are starting with, once I knew I had a solid bottom, I would give Dwayne a call and have him spec you a cam. You didn't mention compression or rpm so those are big factors. Once you get a better feel for your power curve, you can gear and converter it to make it work together (as it is likely you will need more of both).
That is good information. But I would suggest getting the 60' down to the 1.6 area first. That, by itself will help the ET significantly and probably reduce how much more power was needed to get on down to 7.5. And the improvements done for that would be necessary anyway after additional power was added because adding power first could possibly make the 60' worse rather than better.
Master, again and still
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Re: Help me get my combo to 7.50 on the to 1/8
[Re: moparx]
#3165403
08/03/23 07:47 PM
08/03/23 07:47 PM
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Joined: Mar 2006
Posts: 9,839
MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,839
MI, usa
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at what et does the 100lbs per 10th rule start to peter out and added horsepower take over ? maybe i'm not thinking this through correctly ?  [wouldn't be the first time........]  It's always HP/Weight. Obviously 500hp in a 3500. (7.0 weight to 1 hp) car wont make the same change as 1000 hp in a 2500lb car (2.5 weight to 1 hp). I can tell you that my car at 3350 and aprox 900 uncorrected hp that 10lbs/ .01 is damn close. Doug
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Re: Help me get my combo to 7.50 on the to 1/8
[Re: belvedere1967]
#3180692
10/03/23 07:27 PM
10/03/23 07:27 PM
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Joined: Jan 2003
Posts: 20,787
A collage of whims
topside
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 20,787
A collage of whims
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Sure, HP/Weight, but putting that HP to work - converter & gears - matters, no ? OP shouldn't feel too bad in any case: I have a buddy with a SB stick '57 Chevy...can't get it out of the mid 8s in the 1/8 despite spending many thousands on all kinds of stuff. 5-something rear gear, Cal-Tracs, faceplated, slicks, trick carb, spendy engine, etc etc. - though he's adamant about running a the 350-horse cam - so it sounds tame, I guess. He's an old FC racer who knows his way around a racecar, too, so I'm baffled. After a few years of hearing about it, I finally told him my 292-inch '57 ran 12.80s in the early '70s, with a helluva lot less $$$ & street tires  
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Re: Help me get my combo to 7.50 on the to 1/8
[Re: belvedere1967]
#3180726
10/03/23 08:20 PM
10/03/23 08:20 PM
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Joined: Mar 2011
Posts: 3,076
Michigan
A727Tflite
master
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master
Joined: Mar 2011
Posts: 3,076
Michigan
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I do not have a way to log it but I'm thinking it flashes around 2800 If you truly have a 175 K converter than you are making less than 280 ft. Lbs. of torque. Something is way off in the engine or you’re stall speed estimate is way off.
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