Agreed, but that doesn't mean you can't take your best shot at getting it right the first time. I picked a configuration that I can easily go up (3.73) or down (3.27) if need be, fairly inexpensively. I don't know what else you expected.

When you're still in the process of designing the car, you can endlessly debate which gears to go with. Eventually, though, you have to make a decision and buy the parts. Decision made.

 

Yes yes we all hate you Jimbo.

BTW i like your choice on trans & gearing

 

Wicked...

The thing is that i would have still chosen the 4.11 gears... but this is just theoritacally but here it goes...

You would have
46 in first
66
95
136
170

I guess that would be an awesome gearing for a car that revs a lot... you will "let it rev" with a 4.11. In terms of top speed per gear I would still choose the 4.11.

But now to the practical view. the thing is that the multiplication in first is :12.21 and second 8.51 and 5.88 in third.. which means that in a 2700lbs car you will be burning first second and third... which you would need a slick to drive around and it will feel like a honda in 6th gear... 60mph@2000rpm ??? damn no...

I dont know.. too much rpm???

With the 3.55 you keep what you are saying but I find it that you will be shifting at 5300 after each gear (more or less).... What do you think? how much torque are you making at 5300?

 

Yep, 4.10s are way too much gear for a street car/tire with a 2.97:1 1st gear. It's borderline as it is with the 3.55s, but should be fairly usable, especially with traction control.

On street radials, more gear wouldn't have bought me more acceleration, in my opinion. It would only have increased the probability that the RaceLogic system would have to step in, and reduced the input "granularity" of the throttle even more.

60 mph in 6th should be about 1,725 rpm, by the way. I don't know that you'd want to drop much lower with a cam as big as mine... the ride might get a little jerky, if you know what I mean.

563 lb-ft.

 

Thanks.

 

Yes after thinking about it.. its the best choice.. actually.. its the choice I wanted, but... No M29 available... and I am not about to spend 1700 bucks on a trans right now...

But I will...

 

Well, Sallee Chevrolet has them waiting when you're ready...

http://www.torquecentral.com/attachm...=&postid=71897

 

Isn't it a better idea to change just the 5th gear on the tranny rather than buying? or what are you risking if you do?

How much for the racelogic?

 

The reason I bought an M29 was because my car (obviously) didn't come with a T56, and I wasn't willing to put an "unknown" used T56 in that I'd possibly have to pull back out for a rebuild soon after. The M29 is also the cheapest new T56 available from Chevrolet, with the fringe benefit of having the gear ratios that I wanted. Obviously, with a pre-existing T56, it would be cheaper to send it off to D&D or someone else and have them work it over and throw in the 5th and 6th gear ratios you wanted at the same time.

The RaceLogic system for a V8 with ABS and launch control is normally $1,300, with the full throttle shift option available for another $175. I helped pull together a group purchase with the RX-7 and Supra communities that sold over 100 units, but the best price break was reached at only 20. After the 30% discount, I paid $910 (I passed on the full throttle shift) and everyone in the group purchase got the dash mount control thrown in free of charge.

http://www.racelogic.co.uk/traction.htm
http://www.racelogic.co.uk/adjuster.htm

 

Ya the racelogic stuff rocks, thats what I am using for my 68.

A friend of mine with a 700hp Talon has their system and loves it. I drove the car a few times and I was impressed enough to buy it too.

Gearing selection blows....i just started doing that and its frusstrating, but looks like I will be going with a similar selection of gears, but with a higher rear gear, 3.23 most likely.

good luck man, i know how long and involved projects are....

Hunter

 

Why is the trans cheaper?? I always wondered that?? is it softer? will it break if ridden hard.. I remember that was the point..

Since the first is so steep it broke first gear or something.. anyways.. i dont launch with slicks...

 

Wow Jim that racelogic stuff looks great from the info on their site.

But im curious for input on an unbiased source. Have you ever been in a car that has it? Or did you just drop the money on it hoping that it is good?

 

I was playing a bit with excel and liked the 0.84 5th of the z06 better than the 0.8... of course.. that's for MY application

How much would D&D charge to replace it??

 

I disagree and I'm using a 3.06 first gear However I'm not making anywhere NEAR the same power or torque from my stock LT1 shifting at 5500 Those gears and my Vigilatne were good enough to get my 2 ton boat to the 60ft mark in 1.82 seconds though

 

I guess I should have specified that I was talking about my car only.