Duke

Hello,
does anyone have a spare 996 steering rack laying around?
I need to know how much the rack moves per every full turn on the input axle from the steering wheel.
A 997 rack moves 57 mm per revolution, I have a feeling the 996 rack is slower.

I use a 997 rack in my race car and need a rack that is a bit slower. I use custom uprights and the steering arms on them are very short meaning I have less than 2 turns lock to lock.
https://www.facebook.com/RevlineTimeAttack
Thanks!

lordpantsington

2.98 Turns, 16.9:1

Duke

Thanks. Any idea how that compares to a 997 rack?


The problem with steering rack ratio is that it is dependant on the upright /steering knuckle dimensions.
It would be very good to know how much the actual rack moves per 360 deg steering wheel rotation

lordpantsington

All of the numbers I've posted come from street racks. 2.62 turns, Variable 17.11:1-13.76:1 it is 17.11:1 near center, and changes for steering wheel movements of greater than 30°.


The 2005 996 Cup Rack is listed as having 40mm of travel. (996.347.005.90)

sbelles

I've got a spare 986 rack. I would assume it's the same as 996.

Duke

Yes. Would be excellent if you could measure how much the rack moves for one full revolution on the steering shaft input.
For reference a 997 rack moves 57 mm and Porsche 944/964 40 mm IIRC.

sbelles

I will as soon as I find my caliper. It's not where it's supposed to be.

sbelles

I get 47 mm but that's +/- at least a couple.

Edit: It was actually 1 7/8" Still haven't found the caliper.

lordpantsington

Further info from PET
986 racks are:
996 347 011 04,05,06,07
996:
996 347 011 05,06,07
996 GT3:
996 347 011 07

Duke

Perfect that was exactly the info I needed!