I would suspect the problem with launch is in the chassis not the trans...or
tires for that matter unless the tires are hard and dried out, are they gumballs
or super speedway tires made to handle a tremendous amount of heat for 50 laps?
get a set of sticky tires made for qualifying on a short track like martinsville
and then probably soften the rear up some so you get some weight transfer. If
you are using the setup for Winston cup racing it has nothing to do with drag
racing.. I would also look around the car and see where it can go on a diet 3200
is a mighty heavy race car when you only have a mile..
Dave Dahlgren
rgribble wrote:
>
> Hi Everyone,
>
> I've got some decisions to make regarding transmission & rear gear selection
> and thought with this vast cache of knowledge, I could get some opinions that
> would help me with mine.
>
> I have a Busch Grand National (Winston Cup) 97 Tbird that I run at Maxton. It
> has given me rides at 204+ MPH last year. It's hard to do a direct comparison
> from last to this year's setup but I've made some changes and now I can't get
> to Two. I don't know what loss I've got in motor (nothing's been done to it)
> I'm working on a replacement power plant and hope to have it for this next
> meet.
>
> It seems to me to be a loosing lot in getting through 1st & 2nd gear. It's
> 3200 lbs.( 45% rear wheels) with approx. 650 HP. The transmission I'm
> presently running is a Super T10 ( w/264,175,133,1 gears) with a 2.75 rear
> gear and twisting about 6700 in the traps. (should be 7500-8000). My tires are
> Winston Cup/Goodyear 15" x 10"wide and 28"tall.
>
> The biggest problem I experience is that I get a lot of wheel spin in 1st and
> 2nd gears. Any attempt to go WOT and it spins, so much that I have to use my
> traction control (lift my big toe) to avoid it. I feel that this is robbing me
> of a lot of performance.
>
> For the next meet I plan on changing the tires, rear gear and tranny and would
> welcome any thoughts.
>
> I'm planning on using a 27.5" tall tire with a 12" width. That's a =" smaller
> which is about 4 MPH, but the additional width may get me a better bite.
> (don't know about the drag the bigger tire would create?)
>
> I have the unique position of being able to put in a Super T101 tranny (w/
> square cut gears and full roller bearings by Tex Racing) with any gear
> selection I want ( which is what I'm not sure of ). I can run any Ford 9" rear
> gear ratio I want but my target is a 3:00. (3.0 rear gear, 8000 RPM & 27.5"
> tire)
>
> Presently, I'm planning on a 3:00 rear gear with a tranny set up of 2.55 1st
> gear, 1.60 2nd, 1.29 3rd. and 1.0 4th. That appears to me to be the most
> balanced ratios to max my use of available HP. Most of the Winston Cup
> engineers tell me taller (2.55 vs. 264) gears will help with wheel spin, and
> most Drag Racers talk about using the opposite to avoid the spin.
>
> I would appreciate any opinion(s) regarding the problem(s) and any solutions.
> Thanks in advance.
>
> Grib
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