95silvia14

iTrader: (2)

So were putting this tt setup together and looking to get roughly 1200 to the ground what are people using for manuals with high amounts of tq. The closest thing I can find is a tranzilla but even that says its only good up to 1000.

3pedals

iTrader: (3)

I run a GF5R, but I have only run it at 800rwhp so far. Gforce told me its good for 1300

gnx7

iTrader: (28)

What is the weight of the car.... and intended use?

I'm pushing 1400hp thru a stock T56 Magnum and great driveability with a 1200hp RXT McLeod clutch I haven't launched it hard yet..... End of March it'll be up and running again.

I made 1060rwhp/1070rwtq at 14psi on a Dynojet. Have had it up to 22psi in 4th and 5th gear shifting as high as 7800rpm doing 1/2 mile racing. It was gaining about 50rwhp per pound of boost from 10-14psi.

stevieturbo

I'd doubt you'd trouble either a Magnum or Tranzilla.

Even a normal T56 could last very well depending on application.

They're a little stronger than any ratings suggest

95silvia14

iTrader: (2)

its a drift car that will see normally 7-800 but will see around 1000 during comps. I have toyed with the idea of doing some of the mile run events. car weight is around 3100 with me in and loaded down.

Forcefed86

iTrader: (4)

I wouldn't fart around with the OEM based units, none of them were designed for that kind of power, period. (not that companies haven't put a mint into R&D and gotten some to last at those levels) By the time you pay for all that you could have bought a purpose built trans made for the power.

Call up Jericho, lenco, liberty etc... and tell them the application.

323z

I have the same set up as gnx7. T56 mag, 1200 rxt. looking for 1000+ to the wheels.But I don't plan on doing hard launching (freeway car)

As Steve said I dough you will need more. unless you start drag racing it, Then you might as well put the 3k towards a built 80le

stevieturbo

Again, either a Magnum or Tranzilla will have no issues.

Whether you prefer genuine Tremec parts or a built trans like the Tranzilla, entirely up to you, I think the Tranzilla gives you a few more ratio choices though

stevieturbo

I'd imagine any automatic would be terrible for drifting, and it seems they also suck for big power and mile type events.

323z

**** Drifting I could see but I thought all the big boys pushing real power opted to go the auto route.
Don't see to many 8 second stick cars.

hellbents10

iTrader: (10)

The T-56s will break stuff with no lift shifts and a good track at 800hp.

stevieturbo

He isnt trying to build an 8sec drag car though ?

And he mentions possible standing mile...very few of those who go fast will retain an auto.

And dont think he's said anywhere he intends to flat shift ?

323z

Steve I was using the auto as an example. As it's hard to find a Manuel car on this forum in the 8's. I have read a lot of builds on here where the OP started with a Manuel but very quickly switched to an auto.

I know drifting is a different beast but I am thinking of the punishment the trans will take and why 95% of the higher horse power builds on here go auto. Because it's hard /very expensive to find a Manuel to hold up to the power.

not many Manuals at that hp levels, 3-4k$ for a 7-800hp t-56mag or a 1200hp transzilla at 9-10k$.

stevieturbo

Most of them here use auto's because their main use is drag racing, so it makes sense. Auto just makes it so easy to run fast times, but there is certainly no lack of people having problems with autos too.

a $3k Magnum ( or $4k for a F body converted Magnum will handle the power no problem, or a Tranzilla, and list on them is around $3-4k too.
No idea where you're getting the $9k price from ?

3pedals

iTrader: (3)

My GForce GF5R was just over 5k, and it will do it all. Drag, drift, road race, standing mile. .... best investment I have made in a trans

stevieturbo

Wont be going very fast over a mile with a 1:1 top gear trans unless you've an extremely tall diff or tyres though...or access to 9-10000rpm or so

Although I've seen some of the cars running 200+ still seem to do it in 4th gear, which is surprising. They must have a very tall diff

3pedals

iTrader: (3)

There are very good reasons to use a 1:1 top gear trans for high speed stuff. Driveshaft critical speed is 1 of them. Efficiency is another. You will go faster with a given hp at 1:1, than in an od gear

Tirefire

iTrader: (1)

I would say its very hard to find a clutch that can stand up to all the hard lauches/clutch dumps @ 5500. Im on a twin disk mantic now but I know it wont last. I can assure you I wont be paying for another $2000 dollar clutch again. For that price might as well go auto. Thats the reason I will go auto after this breaks. Which should be soon. Lol

stevieturbo

Actual shaft speed is dictated by road speed, tyre diameter and final drive ratio.

Not anything to do with the transmission.

If I am doing 200mph driveshaft speed is the same regardless of what gears are in the transmission. Gears will affect the relationship of engine rpm vs shaft speed though.

Andif he makes 1200 that should allow an easy 200+ over a mile. Although with his current diff ratio, I'd say he has no chance of 200.

The main reason a 1:1 can be good, is simply strength. As there are no gears involved, it creates the strongest possible driveline.

Once you start getting into overdriven gears, that puts more strain on a transmission.

3pedals

iTrader: (3)

Direct 1:1 is also the most efficient - lowest power loss through trans.
And the OD reduces tq output at the output shaft. Equal to the amount of OD ratio.
Then when you do the math for driveshaft speed, you will see that if you gear the car for peak projected speed, the driveshaft rpm for the OD trans is higher by the same factor as the OD ratio.
So yes, trans has alot to do with driveshaft rpm.

I fully believe a 1:1 trans like my GF5R, or a Liberty 5100 is the best choice for a drift car, drag car , or even a top speed car.