What to do to make a T1 tranny handle 300 FtLbs of torque?
 

What to do? Is it even logical? Should I just try a different tranny all together. I'm planning on 250 HP and pushing it

Forget it!!
go for the 915 or g50 from the start.

I have a single cover box with all the tricks in the book and its going to break.
mayby it wil last me a couple of months. but at the first dragrace...snap!

Vin
:p

you can make a typ1 irs box hold up but have to spend the money.
know of a few people who push upwards of 350bhp through one with slicks and there still in one peace.dont get me wrong you can break them but i know of people who have broke pro-drag box's with 120bhp :rolleyes:
iam putting 170bhp and slicks through my pro-comp type 1 irs with no problems yet and intend to put more than 250 through it next year.
a porsche box is not the be all and end all of it,first gear is a week point and its a lot cheaper to rebuild a type 1 box with all the right bits than a stock 901/915 with all the wrong gear ratios.
have you thought of trying a typ2 irs box?
cheers rob

Yes the typ2 box is a strong unit. you want the one with 5 ribs around the diff section. Gear ratios is wrong for racing thou.
The horsepower is no problem for the type1 but the torque is going to snap the half meter long inputshaft with the stupid conection sleeve.
t1 is no good for higher than 7000rpm either. bearings will seize.

I will put my money in a 915 box. expensive to rebuild... yes! but they vil support a 3,6 twin turbo porsche engine!

Also the best you can do for your gearbox is take up all the slack in the system with the cluch before you launch hard...
just grind the cluch a little before you sidestep...

I just bought a irs box from a type 181 with one cover. Are these strong boxes? Would it stand 200 Bhp? What do I need to change to handle the 200 Bhp?

Grtz Tom

i'm thinking 915 or T2

i think there's some guy near me that has a 914 or 915 just sitting in his driveway doing nothing, i'll check that out

blahhhh


no money....


i just have to get past all the rust now, it's such a pain, i'm sure most of you know.

...spending 60 hours fixing rust is no fun thing

6 rib....beef it...should be fine...those are price from the get go though....

what about gears and the center shaft and all that?

a type one center shaft looks like it would snap under 100 FTlbs, let alone 300

the gears can't be all that stong either


bahhhhhh!

haha, oh man.

this isn't really helping so much so far, no one really has any straight answers on waht definately would work as far as type one's two's porsche swaps, or what about drag boxes?

HP and torque doesn't grenade transaxles. How you apply them does. ;) Call a reputable transaxle builder and talk to them about your application, intended use and budget. I went with Kevin at KCR and was impressed with his input, quality and $$$...

the way i'll probably be driving will grenade 6 transaxles

Check the code stamped into it. If it is AV, you have a true Type 181 gearbox. The whole trans is exactly the same as a late Bug trans except for the R&P and the output flanges.
The T181 will usually have the strongest "O" type 4.12 R&P. The flanges are the same spline as Bug, but they take the larger Bus CVs.

The only upgrades you need to do is change out the stock fine tooth 3rd and 4th for Bus 002 gears, and install a Superdiff or a ZF or Quaife.

I did check the code and it is an AV box. Does the bus gears fit in the 181 box without changes? Does anyone have some experiance with the quaife diffs? I know you can bye them with t1 splines or t2 splines. Wich one is the best? The greater flange size doesn't matter because I have the porsche 944 turbo arms so I need them anyway. THx for the advice.

Tom

Ok, you want a straight answer, chew on this. Drag boxes for 500 bones handle 150 lb/ft of torque tops. The 901 will handle 250 lb/fts reliably. A 915 will handle 350 lb/ft of torque tops. A 5 speed G50 from a 964 will handle 600 lb/ft of torque. A 6 speed G50 will handle 800 lb/ft of torque in a 3000 lbs car...I'm saving up for the 6 speed and at 4500 bucks and working lots of overtime, it'll happen soon enough.

Is that straight enough for you?

Any thoughts on a Boxster trans? theres some cheap-ish ones on eBay

woo! hooray lazylongboarder!

thank you!

Where did you get those stupid numbers? Cite the scientific testing that was done to determine those cutoffs. They look like SWAGs to me.
I can build a Type 1 gearbox that will easily take 200ftlbs for less than $500.

Whether a trans can withstand a certain peak torque has very little to do with the design, and much more to do with the idiot behind the wheel.

Well since it's a mid engine design, you'd have to flip the rp or flip the tranny upside down, so mounts would be an issue for those of you looking for a bolt on install :rolleyes: . The 3.2 in there puts out 270 hp and i've seen aftermarket turbo kits putting out well over 400 hp in a 3200 lb car...so in short, yes the boxter tranny would work, the S models have a 6 speed but you have to worry about custom axles and so on...

The reason why i'm doing an entire 993 rear end is cause i'm using it the way porsche designed it. I got some suggestions of possibly narrowing the whole suspension setup, but even if you're really really good, you'll screw up the geometry and it won't work like it's suposed to. I can use stock axles, stock hubs, stock sway bars, stock 6 speed g50, and bilsteins PSS9 setup, all without killing the geometry...

Russell