Dragaholic

iTrader: (180)

As soon as my tranny sells, I will be converting over to a TH350 with reverse manual valvebody and trans brake. My question is, how do I determine what stall, gear, and tire I need? Obvious more of everything, but how much? I'm currently running a PT4400, 4.10 gear, and 26X10X15 ET Drag. I'm thinking a 4.56 is what I'm going to need, but I could be wrong. If so, what tire will get me through the traps with a 7200 rpm rev limiter? I curently have a 6800 rpm shift light, but I would imagine by the time I shift, its around 7000 rpms. I want to run a big tire for maximum traction and 60 ft. time, but I dont want to over do it. I want it to compliment all related parts. I need to step up my setup with this new cam and need some help. If there is any info you need to help me determine what I need, let me know. Thanks.

Ben R

I use a Moroso Power-Speed calculator. There are a bunch of RPM/Gear/Tire Size converters on the internet. Keep in mind that you can't use the RPM your engine turns because of converter effeciency. Your driveshaft speed will never be the same as your RPM. The better the converter, the less slip you'll see.

So Slow

iTrader: (2)

If you are planning on using the Transbrake at all you are going to have more tire then the 26/10/15 at least I did..After going to a 2.48 geared Turbo 400 with a brake, 4500 Vigilante converter and a 4.30 in the 9" I killed a set of 26" ET Drags on just about every pass..I tried air pressure from 17 all the way down to 10psi and never could get them to hook..Everyone told me I needed at least a 28"/10.5/15 ET Drag to take advantage of using a brake and after putting a set on they were right..

But to compare apples to oranges I was running a 4L60E with a TCI 4400 converter and a 26/10/15 ET Drag with the 4.30 rear gear..I would shift the car at 7100 and cross at 7000..

After going to the Turbo 400 with a 28/10.5/15 ET Drag and the same 4.30 gear I started shifting the car at 7000 and the car crosses at 6700 now..Myself I'm sooner or later going to put a set of 4.86's in the car but during this summer I'm sticking to the 4.30's till our good air comes back..

4.56's with a 26" slick should get you right at 7000 rpm's if you can get the 26's to hook...IMOP...

Dragaholic

iTrader: (180)

A 26" slick is out of the picture. I need a tire with a bigger foot print and more roll out. Its either a 28" or 29" tire. If youre passing the traps at 6700 with a 4.30 and a 28" slick, then 4.56 and 28" might work for me or maybe even a 29". It depends on how much slippage from the converter because youre 4L60E with a TCI4400 and 4.30 gear passed you through the traps at 7000 and I currently have the same setup but with a Yank PT4400 and a 4.10 gear and I'm not 100% sure what rpm I pass it through, but my shift light is on and its set at 6800 and comes on about the 50 ft. or so. I have a 7200 rpm rev limiter, its never hit after I pass the traps. So its anywhere from 6800 to 7200. How can I calculate how much stall I need for my setup? I need to make sure I get this right for my naturally aspirated setup as this will probably be my last stall, gear, tire change unless my setup changes. Thanks.

The Juggernaut

iTrader: (7)

a 4.57 gear, 5200 stall 8" converter, 29" tire will max out around 129mph.

Ben R

A custom torque convert is the way to go. They'll take into consideration your gear, tire size, estimated MPH, power, weight, tranny type, and a bunch of other stuff to get a convert that is designed especially for your setup. They're much more effecient than an off-the-shelf converter too.

Then when you put a fogger on it you can have it re-stalled for the dope.

Ben R

You forgot RPM.

Dragaholic

iTrader: (180)

Is there a particular brand, style, or size you guys recommend? I went through Summit's site and there are tons of 28" and 29" tires on there. I'm not 100% sure, but pretty sure I'm gonna need a 4.56 gear. Whats required to fit a 29" tire? Lastly, what torque converter company do you recommend for a custom torque converter specific for my application? Thanks.

Ben R

www.protorque.com Far superior to Coan, A-1, Neal Chance, or anybody else.

Mickey Thompson 29.5x10.5x15. You might have to have your fenders rolled to get them to fit. It's a big tire. Well worth the money though.

Dragaholic

iTrader: (180)

I saw a few 29.5x10.5x15 tires, is there a particular one? I think one was just regular, one with a W, one with C, with S, etc. I wonder if a 4.56 is enough gear for the 29.5" tire or do you think a 4.88 might be needed?

Ben R

Get the plane 29.5x10.5x15.

A 4.56 gear with a 29.5" tall tire and a 7,000 RPM limit will get you to 135 MPH. That's assuming no converter slip, which will never happen.

Dragaholic

iTrader: (180)

I shift at 7000 rpms and have a 7200 rpm rev limiter.

10-4 on the tires.

Ben R

138 MPH with a 7200 RPM limit. That's still assuming no converter slip.

Dragaholic

iTrader: (180)

What kind of ET does 138 mph support? I currently run 10.7s at 124 almost 125 with an unlocked converter. I know there's going to be slippage, but not 13 mph's worth. Both the fastest cam only cars go 10.29 at 128, so I should be good. They both are running ATI 5500 converters. I wonder what size tires they're running.

Mike TexaSS

iTrader: (2)

138 MPH will get you into the 9's.

Dragaholic

iTrader: (180)

I think I'm pretty set on the 29.5x10.5x15 ET Drags. A 4.56 looks like a good gear to match up with it. Would a 4.88 be too much? Has anyone used or using a Protorque converter? What it boils down to is this new setup. I already know what tranny I'm getting, who will be building it, what it will consist of. I just need to be sure that I combo the right setup. Depending on what I do with the fenders, will determine if I'm going with the standard 10.5 or the 10.5W. Protorque is the only converter company that has been suggessted to me for a custom setup. I'm not saying I'm not going with this company, I would just like more input and opinions. So let me know what you think I should do so I can put this baby to rest. Thanks.

Dragaholic

iTrader: (180)

Ok...here's the skinny, I'm going with 29.5x10.5 ET Drags, already order the Trans-King TH350 w/reverse manual valvebody and transbrake, I'm getting a Protorque converter and its going to have anywhere from 4800-5200 rpms stall speed, but may be closer to 5200. I'll be doing a mini-tub probably using the Wolfe kit, then narrowing the rear end 3 inches per side, and going with 15x10 Bogarts with 5" of backspacing. I currently have a 7200 rpm rev limiter with 7000 rpm shiftpoints. What gear will match up best with the 29.5x10.5?

Ben R

4.56 will be the best gear.