TF for a blower motor- or a Glide??

tweety said
Ok Chris I need some input on transmissions for blown motors, I've got to tell you I'm very wary of high horsepower torqueflites, but what are thoughts on building a race trans to put behind a blown smallblock, figure around 1250HP and 900+ lbs of torque, it's all low RPM's though , the motor should never see much over 7000RPM.
Car weight will be around 2800lbs final gearing TBA?
I'll probably get an ATI blower converter, I've used that company a lot in the past and I've never had any problems with them-ah I neeed some bench racing tonight :mrgreen:

Hey tweety,

1250 at the crank is a bunch .. who's blower are you going to use? There are a handfull of cars making 1100ish hp out there, going 7.60-7.70 with the 727. Can the 727 handle another 150 hp? In my opinion yes, but you will hear different from other builders (rossler, coan, hughes etc). Converter choice will be critical.

Couple of things to look at ..most importantly the cost. It will cost over 6k to build the 727 opposed to 3-4k for a glide. Are you planning to race on a bracket or pro tree? The 727 works better off of a bracket tree. It isn't as quick off a .400 pro tree as the glide.

As far as gear ratios, this is another area that people making a lot of power are concerned with 3 speeds. If you have too much starting line ratio, you'll blow the tires off. Thus the reason people use the 1.78 1.80 etc first gear glide's. The factory 727 has a 2.45:1 first gear. At this time, we can go as numerically low as 2.28 first. This gear set has strait cut teeth opposed to helical. Rumor has is "someone" will be making a 727 gearset with a 2.08ish first.

For what its worth I'll be using a 727 with the 2.28 first with around 1000hp or more. However, I personally don't have any customers with my 727 tranny making that much power .. want to be the first? :mrgreen:

Hope this helps some! :salut: :thumleft: