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Optimizing a powerglide drag car

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Optimizing a powerglide drag car

Postby BOOT » Wed Oct 05, 2016 11:08 pm

Ok I've read it both ways broad power band or narrow with a high stall? Gonna get the car as light as I can of course and it's not gonna be a super fast big engine car, maybe 12's.
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Re: Optimizing a powerglide drag car

Postby Speedbump » Thu Oct 06, 2016 1:38 pm

Other than simplicity, why the PG? In my modest experience, the combo you describe is almost always quicker with a 3 speed and the cash outlay is about the same also. Exception might be a bigger inch big block with gobs of bottom end. Not disrespecting, just wondering.
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Re: Optimizing a powerglide drag car

Postby BOOT » Thu Oct 06, 2016 4:18 pm

Just something I wanna try. Picked a gear & tire that would make the trap mph just above the estimated ET.
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Re: Optimizing a powerglide drag car

Postby F-BIRD'88 » Fri Oct 07, 2016 5:51 pm

if it is a typical 12 second ET car the best way to "optimize" a powerglide is to just add another gear.
As a 3 speed automatic trans th350 will always be better than a power glide on this car.
It may run the same ***BUT**** It will never be slower.
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Re: Optimizing a powerglide drag car

Postby BOOT » Fri Oct 07, 2016 7:45 pm

I know a th350 would be more ideal, but I didn't ask that!
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Re: Optimizing a powerglide drag car

Postby larry woodfin » Tue Oct 11, 2016 2:12 pm

Boot,

The key to a powerglide is correct converter choice. What you describe will be just fine and very capable of winning. Talk with some of the popular converter builders, they will have plenty of experience with what you are planning.
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Re: Optimizing a powerglide drag car

Postby barnym17 » Wed Oct 12, 2016 2:01 pm

on my bu when it was running 8.0 1/8th mile swap from th 350 to glide was worth .2 in the 1/8th. Same swap my buddys th 350 for my glide for giggles slowed my car the same .2 and picked his 3500lb Camaro up from 7.20's to 7.0's
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Re: Optimizing a powerglide drag car

Postby barnym17 » Wed Oct 12, 2016 2:02 pm

Glide 60 ft slower but killed th350 everywhere else.
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Re: Optimizing a powerglide drag car

Postby larry woodfin » Wed Oct 12, 2016 2:42 pm

Just food for thought,

one [of several] reasons a Powerglide works so well in drag racing is because it causes the properly selected converter to work at multiplying torque. In low when leaving the line because of the low gear ratio the Powerglide "stays on the converter" longer during low gear, thus, multiplying torque longer.

At the shift, again, it is back on the converter multiplying torque until the driveshaft speed becomes closer to engine speed. This is the basic reason matching torque converter selection to your combination is very important

Other Powerglide advantages are lighter weight and less rotating loss.
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Re: Optimizing a powerglide drag car

Postby BOOT » Wed Oct 12, 2016 5:59 pm

barnym17 wrote:Glide 60 ft slower but killed th350 everywhere else.



Same tire and gear? Tire width as well as height.
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Re: Optimizing a powerglide drag car

Postby barnym17 » Wed Oct 12, 2016 8:27 pm

Yep same gear,tires only things changed was trans and converters.4000 stall on glide 3500 on th350.two totally different th 350s and converters so it wasn't a trans problem.Sapped back next week and got my.2 back.This was with a 4.10 gear little 355 did engine and 3100 lb car in mine 3500 his car.Even stranger later that year went from 4.10 to 5.13 gear and only change was rpm at the stripe timeslips were pretty much no change.
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Re: Optimizing a powerglide drag car

Postby larry woodfin » Wed Oct 12, 2016 8:33 pm

even more food for thought;

with a track dedicated, trailered race car, even a 13 second or 12 second race car with Powerglide will perform best with an 8" converter designed specifically for your application
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Re: Optimizing a powerglide drag car

Postby BOOT » Thu Oct 13, 2016 3:16 pm

Yah 8" prob be a good idea, thx for the suggestion. Also prob a good idea to use a trans brake.
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Re: Optimizing a powerglide drag car

Postby AMXstocker1 » Fri Oct 28, 2016 5:31 pm

what about a glide with a gear vendors so you could use it like a 3 speed by splitting first gear?
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Re: Optimizing a powerglide drag car

Postby BOOT » Sat Oct 29, 2016 9:49 am

That's an expensive 3spd
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