C4 Conversion From T5 Manual

[xr6twin]

Hey guys,

Just trying to find some info on, or if anyone has had any experience with doing a c4 manualized conversion into an xr6t?

Iv got a mk1 BA ute that iv done a twin turbo setup on and it makes loads of power (520+bhp) but the t5 manual behind it has suffered a major let go on third. Iv been wanting to jam a manualized auto behind it rather than a manual just because I believe this will see a better compliment of the power output. (Doesnt make power till 3200rpm)

Iv never had any experience with stall converters, what would be the best rpm stall to get?

What would be the best diff ratio to run to get a decent highway cruizing speed?

Anyone with any relevant info or opinions would be appreciated,

Cheers

Tim

[FPV TRANNY]

What about a T56 conversion?

[MattyP]

Pics of twin turbo!

[ms700]

A T56 behind 380kw? wont even break a sweat.

ps 520hp used to be loads, but unfortunately its average tuned output these days.....

[FPV TRANNY]

that's still BTR territory @ 380kw. that's pretty basic power these days..

[xr6twin]

Does anyone have anything relevent to respond with other than power outputs?

Im trying to seek some info people.....

(I will add that the power bottle necked at the 520rwhp mark simply because the tuner was not game to push it any further with a t5 for obvious reasons)

Im not really interested in keeping it manual, I still dont think a t56 manual will get it to its full potential in terms of giving it a chance to spool before the drive line grabs.

[gregaust]

I have done a few C4 conversions. What you need to know as to fitting? I do have template to make crossmember also Going from manual you'll need to mod tail shaft or use an auto one from BTR bolts in. Being manual from memory needs no mods to ECU. ( If was previous auto needs trans speed settings turned off)

As to which converter best give all your specs to a good converter company and they build the stall to that.

I always used the torque power bellhousing.

Edited 15/08/14 09:01 PM by gregaust

[xr6twin]

Thanks for the post gregaust,

Yeh just trying to sus out what is involved, just general stuff. Yeh I thought a cross member and tailshaft mods would be needed but good to know what I can use as a straight bolt in. How would a BTR tailshaft handle the power? Is there a general torque limit before they decide to become a pretzel?

How do the c4 go driving on the street being a 3 speed? I imagine trying to cruze at 100kph an xr6t would be revving its head off? Do you know roughly what diff ratios they have run?

Thanks again for the info, much appreciated.

[gregaust]

The 3 speed is ok if you don't mind the loss of overdrive. You could try now with your manual what it is like say in 4 th gear. The factory diff is 3.46 so with 3 speed your 100k rpm would be up close to 3000

Tail shaft I'm not sure. I'd guess street use the normal tailshft if in good condition will last ok but if planning drag strip use on sticky tyres then look at upgrading.