BMW V12 in Boxster S with Tiptronic Help!

[Lobo1186]

Well. as far as the gearing ratio is concerned seeing as the 750 motor comes out of a 4spd auto that will tell you something compared to the tip.

now as far as how much the boxster tranny can hold. I honestly am not sure but give a call to the guys at GBOX they if anyone will know. I believe they told me that their specially treated race tranny could hold like 650 or something. and to me if theirs is an upgraded stock boxster tranny I don't see how the stock could handle more than that. to be honest I cant imagine a passat tranny holding up to 700hp either.

it will be an undertaking to be sure. now how will you fit this motor? being Monocoque is there really a way to expand the engine compartment in a feasible way?

[alipendier]

So are the gear ratios close?

Thanks for the info on GBOX, I will shoot them an email...

The rear of the car would be stretched to fit the motor, I am aware of someone that already fitted the motor but to an audi tiptronic (which s even longer than the Porsche tranny) as I mentioned earlier...

Appreciate it, and I will post info from GBOX

[landrovered]

You are going to have a long and painful learning experience here. Mark these words...NO VW PASSAT GEARBOX WILL SURVIVE 700HP

There is a lot of good info in the kit car world about high HP gearbox options. You might be able to use an inverted G50/20 or G50/50 Porsche gearbox but my money says you will need a ricardo transaxle or other racing gearbox and you will not be able to find an automatic you will end up with a six speed sequential unless you want to spend upwards of $25k.

[JTP]

This is a cool idea, but you're going to take a great handling chassis that Porsche spent millions on R&D to develop and it is going to be ruined by cutting it in two and stretching it. Weight distribution and handling characteristics will all be severely affected, negatively. It would be a cool show piece when it's done. I wish you luck though.

[Topless]

Not clear on the purpose here. Anything can be done with enough time, inspiration and $$$. I assume this is going to be a stripped out race car that barely resembles a Boxster. Why use a Boxster chassis at all? I would think a purpose built tube frame designed around your powerplant would be simpler and a lot better in the long run.

** Porsche DME will be very unfriendly to the BMW motor.
** Boxster tub will be heavy and useless in a purpose built 700hp race car.
** A stretched frame Boxster will have few of the handling qualities of the original car.
** Tip transaxle will not survive your powerplant.

It might be cheaper to just buy a 997 cup car and go racing.

[alipendier]

Thanks for all the info

I would still like to know if someone can tell what the max HP the tiptronic can handle, maybe that can clear a whole lot for me... Still

[Brucelee]

Arguably the silliest idea that I have yet seen here at the forum.

Tell me: How do you propose to do a "frame stretch" on the Box, since it is unibody?