Does 993 have a variable ratio rack?
01-13-2019, 12:26 PM
#1
Three Wheelin'
Thread Starter
Does 993 have a variable ratio rack?
Quick question for those in the know. Does the 993 have a variable ratio rack or is it 16.5:1 through its entire range?
I think the answer is that it does not have a variable ratio, but I’m having trouble finding confirmation of that fact.
I think the answer is that it does not have a variable ratio, but I’m having trouble finding confirmation of that fact.
01-13-2019, 12:48 PM
#2
The ratio is fixed but the assist is variable
01-13-2019, 01:43 PM
#4
01-13-2019, 01:59 PM
#5
Three Wheelin'
Thread Starter
Interesting. The reason I’m asking, is I’m wondering how important it is to make sure my mechanic centers the steering rack before aligning the front end. I figured if it’s variable ratio (or assist) then centering might be more important.
Since I put an older steering wheel on my car, and the splines are slightly different, I’m wondering if my rack is also slightly off center now...
Something to chase after or not?
Since I put an older steering wheel on my car, and the splines are slightly different, I’m wondering if my rack is also slightly off center now...
Something to chase after or not?
01-13-2019, 05:32 PM
#6
RL Community Team
Rennlist Member
Rennlist Member
Centering the rack is a formal part of rack replacement if the tie rod end assemblies have been separated necessitating an alignment. There is a port on the rack to screw in a centering lock screw. The screw is a cap screw with a centering point ground on its end that lines up with a centering indent inside the rack, no biggie.
The rack is locked into the center position, the steering wheel is then centered and mounted and an alignment is done. Afterward, the centering screw is removed and the port is plugged with a rubber stopper. Alternatively, if the tie rod ends were not separated and no other work was done on the suspension, the centering and alignment are preserved as the tie rod assembly lengths remain undisturbed.
Andy
The rack is locked into the center position, the steering wheel is then centered and mounted and an alignment is done. Afterward, the centering screw is removed and the port is plugged with a rubber stopper. Alternatively, if the tie rod ends were not separated and no other work was done on the suspension, the centering and alignment are preserved as the tie rod assembly lengths remain undisturbed.
Andy
01-13-2019, 06:00 PM
#7
Interesting. The reason I’m asking, is I’m wondering how important it is to make sure my mechanic centers the steering rack before aligning the front end. I figured if it’s variable ratio (or assist) then centering might be more important.
Since I put an older steering wheel on my car, and the splines are slightly different, I’m wondering if my rack is also slightly off center now...
Something to chase after or not?
Since I put an older steering wheel on my car, and the splines are slightly different, I’m wondering if my rack is also slightly off center now...
Something to chase after or not?
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01-13-2019, 06:49 PM
#8
Three Wheelin'
Thread Starter
01-13-2019, 08:59 PM
#9
the centering indent on the steering rack should have a red dot of paint, easy to see with a light.
if you have a lift you could eyeball the center then adjust your steering wheel as centered as possible.
the splines are close enough that if not centered you'd be only 1-2mm off.
then if the person setting toe uses a standard steering wheel holder the rack would be very close.
or cut a pin, ask it be used and the steering wheel adjusted after toe during the alignment.
if you have a lift you could eyeball the center then adjust your steering wheel as centered as possible.
the splines are close enough that if not centered you'd be only 1-2mm off.
then if the person setting toe uses a standard steering wheel holder the rack would be very close.
or cut a pin, ask it be used and the steering wheel adjusted after toe during the alignment.