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8 replies

ZF Gear box Dimensions

M malowMember
Hi All
Looking at possible replacements for the ZF box so to handle more power
Does anyone have a chart on the box dimensions
I need to know
Centre diff to face where it mounts to engine
drive shaft flange to flange
Offset of drive from inputshaft

Possible choices are the Porsche Turbo GT2 and GT3 or 977
These boxes are
9" flange to flange
Centre of diff to engine 8.75"
Offset drive 3"
Plus these are 6 speed
Original Post

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joulesjoules"Racing is Life, anything before or after is just waiting" - Steve McQueen
My first question is why?

The ZF is more than capable of handling 700HP and has been used and abused extensively in race cars with high HP (both Pantera and BMW M1) for many years.

I have a Porsche G50/50 in my Ultima, the modifications to get it to reliably handle the 600HP made it a $15,000 investment. It is considered one of the stronger Porsche gearboxes. Then there's the adapter plate, flywheel and clutch arrangement adding more $$.

If I really wanted a gearbox for road use other than a ZF, it would be a choice between the Ricardo (Ford GT) or Graziano.

Julian
C coolvetMember
quote:
Originally posted by Joules:
My first question is why?

The ZF is more than capable of handling 700HP and has been used and abused extensively in race cars with high HP (both Pantera and BMW M1) for many years.

I have a Porsche G50/50 in my Ultima, the modifications to get it to reliably handle the 600HP made it a $15,000 investment. It is considered one of the stronger Porsche gearboxes. Then there's the adapter plate, flywheel and clutch arrangement adding more $$.

If I really wanted a gearbox for road use other than a ZF, it would be a choice between the Ricardo (Ford GT) or Graziano.

Julian


That's interesting. We have raced Pantera's with 600-650hp and have found them to be weak in a number of areas. We have broken input shafts, second and third gears plus we have had some crown wheel and pinion separation due to flexing of the alloy housing. So I'm not sure how you are coping with 700hp.

The standard ZF has two overdrive gear ratios which is also not ideal for a race car.

Regards

Coolvet
joulesjoules"Racing is Life, anything before or after is just waiting" - Steve McQueen
Point taken, a lot depends how abusive you are in driving and shifting style. The later M1 variant is substantially stronger in the case.

The original post was alluding to finding something cheaper than a ZF (for road use) and I was trying to illustrate I don't think like for like to handle equivalent HP there is anything much cheaper. Porsche transaxles are equally not geared well and benefit from revised gearing plus billet side plates for V8 applications.

Julian

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