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steering rack
A1 - 7/3/12 at 09:38 PM

Im after a quicker rack for the mk, i have the 2.45 lock to lock one at the moment, but want 1.5:1 ratio. cant seem to find anyone who sells these...

cheers

loggyboy - 7/3/12 at 09:46 PM

I doubt they exist to be honest (outside one of specials) anything less than 2 would require arms of steel at anything under 30mph and lead to it being very hard to keep in a straight line. Those unfamiliar with 2.4 racks often complain of having dificulty keeping dead striaght without constant corrections.

A1 - 7/3/12 at 10:11 PM

im having to shuffle my hands on roundabouts (and when the back goes in that big way) and want to have full lock within easy reach... theres very little weight at the front (bec) so wouldnt have too heavy steering...i hope.

cheers

loggyboy - 7/3/12 at 10:19 PM

I dont think many race cars even have 1.5 LtoL racks, even f1 cars when they are at monaco have 1 to 1.5 racks to deal with fairmont hairpin, and they have power assitance!

I would suggest a change in driving style if your having to make big corrections, either that or try a different steering wheel.

[Edited on 7/3/12 by loggyboy]

britishtrident - 7/3/12 at 10:45 PM

Steering rack ratio is nothing to do with a vehicles ability to run in a straight line. If a car dives off the straight line the problem lies somewhere else, bump steer, toe-in, rear alignment or corner weights.

Racing imps often used a Jack knight pinnion which gave 1.75 s lock to lock rack pinion the standard ratio was 2.75 I found the 1.75 ratio much better for race use but would be a bit over the top for the road.

loggyboy - 7/3/12 at 10:49 PM

quote:
Originally posted by britishtrident
Steering rack ratio is nothing to do with a vehicles ability to run in a straight line. If a car dives off the straight line the problem lies somewhere else, bump steer, toe-in, rear alignment or corner weights.


I didnt mean the cars ability to stay straight, i meant the drivers ability to put small enough inputs in!

A1 - 7/3/12 at 11:10 PM

cool, cheers for the pointers, ill have a wee look... my steering wheel may be slightly big, but i just find that on tighter stuff im having to work really hard to keep up with the bends.

am I right in thinking the original elise had a really quick rack?

T66 - 8/3/12 at 06:12 AM

The autograss crowd use very quick racks, try Berrisford. They will for a fee produce what you want.


http://www.berrisford.co.uk/product_info.php?products_id=30&osCsid=92s1rrcquena0an6l9c6umfb41

adithorp - 8/3/12 at 11:01 AM

quote:
Originally posted by A1
cool, cheers for the pointers, ill have a wee look... my steering wheel may be slightly big, but i just find that on tighter stuff im having to work really hard to keep up with the bends.

am I right in thinking the original elise had a really quick rack?


Are you sure you've got a quick rack and not just a standard ratio with stops in reducing the number of turns/total morement?
I've got a 2.4rack and don't have to move my hands on the wheel except on very tight hairpins. Normal bends and roundabouts are no problem.

A1 - 8/3/12 at 07:56 PM

yea, i used to have a standard rack on it, then got this one which is quicker. i like the idea of going lock to lock in 180derees on the wheel