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Author Topic: a little info/help  (Read 10310 times)

Offline racer

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a little info/help
« on: May 01, 2013, 07:18:23 PM »
making some parts choices and was wondering how many use low gear in a glide and break and how many use high gear only and foot brake it??? thanks jeff
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life is what ya make it!! lets have some fun..

Offline GlennLever

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Re: a little info/help
« Reply #1 on: May 01, 2013, 09:58:40 PM »
I'm currently using low gear and a brake at the line.

I need to drop .25 seconds to run an 8.5 index, might consider foot brake and high gear launch.

I have several other stratiges I'm going to try first.

I do not want to lose the trans brake as I think it adds to consistency.

Just my two cents.
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Glenn R. Lever
Rochester, New York 14617-2012
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Offline FatOldGuy

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Re: a little info/help
« Reply #2 on: May 02, 2013, 04:06:12 AM »
Trans gets very hot with high gear only
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Offline racer

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Re: a little info/help
« Reply #3 on: May 02, 2013, 06:10:50 AM »
i would think so but there is some doing this..thanks for your input..any one else ?
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Offline AF150

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Re: a little info/help
« Reply #4 on: May 02, 2013, 08:31:52 AM »
I think that you need the gear reduction to get a decent launch and good 60' times. This is about the
most important part of a run. The trans brake is insurance at the start line to keep from rolling the
lights and going red. You do not have to leave at full throttle just because you have a trans brake.
Find the best RPM for launching your car. It varies alot with power, weight, tires, converter, etc.
A 2-step is handy if your rules allow it.
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Offline masracingtd1167

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Re: a little info/help
« Reply #5 on: May 02, 2013, 11:42:50 AM »
I would agree with these guy's . Unless you are making a ton of power it's not going to be very fast at all. You are also going to put a severe amount of heat into the converter .
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Offline afaulk

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Re: a little info/help
« Reply #6 on: May 02, 2013, 07:42:27 PM »
I'm glad someone asked this question. I just put the blower on my car and haven't changed rear end gears.  It's a 8 3/4 diff with 4.88 gears. Worked great with a mild 350 but I'm figuring it will be a bit much (understatement  8)) with the addition of the blower and alky.
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Offline AF150

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Re: a little info/help
« Reply #7 on: May 03, 2013, 08:44:15 AM »
Start with about a 4.11.  Should probably keep RPMs under 7500 - 8000 till you learn more about
your combination.
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Offline GlennLever

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Re: a little info/help
« Reply #8 on: May 03, 2013, 09:20:49 AM »
Mine a Pontiac, so it is out there, 461 CID launch at 4500, rear is 3:70 tires are 31 tall run 8.250 at 157 in the quarter 11 pounds  of boost
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Glenn R. Lever
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Offline Marc s

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Re: a little info/help
« Reply #9 on: May 03, 2013, 05:47:50 PM »
I launch off of the brake at 6400 RPMs. From the videos I have, the front tires touch the ground around 200' out. My 60' times are range  between 1.02-1.06.
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Offline FatOldGuy

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Re: a little info/help
« Reply #10 on: May 11, 2013, 07:32:49 AM »
I think I had an A1 trans brake on my old powerglide. It would work in 1st or 2nd gear. When I screwed up and left in 2nd gear(on trans break), my ET was surprisingly very close to the same thing . Just extremely hot after the pass.
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