sled pulling gear - Page 3 - Diesel Forum - TheDieselStop.com
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post #31 of 45 (permalink) Old 10-08-2006, 01:09 PM
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Re: sled pulling gear

here is an example of what I am talking about

video

Programmed shift points, in drive, based on wheel speed.

My truck BEST ET: 12.89 MPH: 109.24
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post #32 of 45 (permalink) Old 10-08-2006, 01:55 PM
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Re: sled pulling gear

That was a nice pull, now after seeing that I think I want a sled pulling program.

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post #33 of 45 (permalink) Old 10-08-2006, 03:55 PM
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Re: sled pulling gear

[ QUOTE ]
Wouldn't third gear in 4 low be about the same as 1st high. You just have the extra 2 gears down low if you start bogging and you have some help getting the rpms up when getting the sled going.

[/ QUOTE ]

It's pretty close, I just thought the big horsepower guys used HIGH range for wheel speed.
I don't want to think about the amount of power going through the LOW range gears of the TC with the transmission in the lower gears.

I'd think with proper axle gearing, you could use HIGH range and take the load off the TC gears which would be the weak link.

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post #34 of 45 (permalink) Old 10-08-2006, 04:06 PM
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Re: sled pulling gear

Not sure how well that would work. I do know that the TC is very strong. I would think that the rest of the drive line would break first.

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post #35 of 45 (permalink) Old 10-08-2006, 04:38 PM
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Re: sled pulling gear

The fewer gear reduction sets you run the power through, the more power ends up at the wheels. Which is the reason most dragsters have gone to direct drive (no transmission) with the only gear reduction in the axle. Of course this would only be practical in a dedicated pulling truck.

Just thinking outloud...

I haven't been inside a 271 to see the gear set, but if guys like bbunting are running in LOW range, it must be pretty robust. Running in direct (HIGH range) would be more efficient though if you got the axle ratio right.

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post #36 of 45 (permalink) Old 10-08-2006, 08:13 PM
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Re: sled pulling gear

In a 6sp there is 4mph difference between 4th low 2nd high and the same between 2nd high and 5th low. Thats counting as 1(L)23456.

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post #37 of 45 (permalink) Old 10-08-2006, 08:22 PM
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Re: sled pulling gear

So what are you running in? (HIGH or LOW)

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post #38 of 45 (permalink) Old 10-09-2006, 06:27 AM
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Re: sled pulling gear

I pull low on a tite track and high on a loose track.

Kevin
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post #39 of 45 (permalink) Old 10-09-2006, 08:25 PM
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Re: sled pulling gear

The problem pulling in drive with just a slighty modded truck is that if you start to bounce and have to back out of throttle, the truck downshifts into 2nd. Pulling first gear high range is about the same as pulling in drive buts it pretty easy to get under the turbo as the sled catches up. Another thing to watch is your competition. If your at a pull with a lot of big power trucks that are stopping 275-300, with a lightly modded truck you dont have enough track to let the truck get into drive and take advantage of the wheel speed before the sled hits and shifts the truck back into second anyways. Now if your in a true "street" class where its all trucks with chips, tuners, etc and stock or very mild turbo ugrades and the sled operator as the sled set accodingly, yes drive is the way to go. I my self almost always pull 2nd gear, convertor locked.

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post #40 of 45 (permalink) Old 10-09-2006, 09:14 PM Thread Starter
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Re: sled pulling gear

whitestroke, do you take off in 1st or second? about when do you lock the tc?

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post #41 of 45 (permalink) Old 10-10-2006, 07:32 AM
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Re: sled pulling gear

[ QUOTE ]
I saw some fool in a 6.0 pullin' in 4-hi 1st.


Didn't do all that bad.

[/ QUOTE ]


That fool took it for 305' in high range

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post #42 of 45 (permalink) Old 10-10-2006, 07:36 AM
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Re: sled pulling gear

[ QUOTE ]
[ QUOTE ]
I saw some fool in a 6.0 pullin' in 4-hi 1st.


Didn't do all that bad.

[/ QUOTE ]


That fool took it for 305' in high range

[/ QUOTE ]

post the vids....

My truck BEST ET: 12.89 MPH: 109.24
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post #43 of 45 (permalink) Old 10-10-2006, 10:12 AM
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Re: sled pulling gear

They are posted Brian. We have even talked about them in chat!! [img]/ubbthreads/images/graemlins/smokin.gif[/img]

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post #44 of 45 (permalink) Old 10-10-2006, 04:36 PM
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Re: sled pulling gear

I take off in second and lock the convertor as soon is i get my foot to the floor and the rpms hit redline.

2000 PSD, 4" exhaust into 5" single stack, AFE Stage II,Wicked Wheel, Factory Tech valve body, AIH plug, BRV, NV Pyro-Boost-Fuel Pressure-Trans temp in quad pod, Dieselsite chip, CPRX, H2E, Monster in a box with 6.0 converter, and DIY 530 Hybrids!! Custom traction bars, pulling stops, and TC Lockup switch. "CUSTOM CNC MACHINING" 2008 Stoneboro NADM 2.6 winner!! 2006 4TH place, 2007 3RD place: Northwest PA Truck & Tractor Pullers Asssoc.My Pictures
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post #45 of 45 (permalink) Old 07-26-2012, 09:14 AM
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Just wondering what 4:56 gears and lockers will do

was told once to leave it in drive, and loc the converter and let it pull till it runs out of power

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