Rack And Pinion exploration
steering box ratio?
Info is trickling in on the rack I'm looking into, I have the ratio, 117m of rack movement for 3 full turns. this roughly translates into 1.53" movement of the bar per turn of the head. my last real rough measurement on my box was 1.75" of pitman arm movement per turn of the steering wheel. can someone verify?
RE: steering box ratio?
FYI, the MR2 rack moves 1.68" for one turn of the wheel.
well, here's the deal on the fiat x1/9 rack: when taken apart the pivot to pivot is about 20.75". too wide obviously but slightly narrower than the mr2 rack. the way the boots fit on the housing fooled me into thinking it was narrower. the other bummer is the ratio, at 1.5" per turn it is a bit slower than the 510's approx 1.75" per turn.
as far as the size goes, it will just barely fit around my left bank header but it looks like it will and it is hands down the smallest rack ive seen in the last few weeks. it also looks like it could be shortened easily buy pulling the bar out and having it shortened and shortening the housing. but if that stuff can be done to a fiat rack why not a mr2 rack and then have the better ratio. I am very willing to lend this out to anyone wanting to mock it up. the hunt contiunes. i'll try maval steering to see how much a custom would set us back.
as far as the size goes, it will just barely fit around my left bank header but it looks like it will and it is hands down the smallest rack ive seen in the last few weeks. it also looks like it could be shortened easily buy pulling the bar out and having it shortened and shortening the housing. but if that stuff can be done to a fiat rack why not a mr2 rack and then have the better ratio. I am very willing to lend this out to anyone wanting to mock it up. the hunt contiunes. i'll try maval steering to see how much a custom would set us back.
- sdterrible1
- Posts: 354
- Joined: 06 Jul 2007 23:38
- Location: San Diego!
- sdterrible1
- Posts: 354
- Joined: 06 Jul 2007 23:38
- Location: San Diego!
talked to maval today. a custom rack for 1 person is around $500. thats the bad news, now the good:
any pivot-point width we want.
nearly any ratio we want - anywhere from 2:1 to 6:1 (i don't know what that means either, just what he said) basically slow to really fast...
any inner tie rod length and possibly thread we want. (his are 14mm x1.5 and could be madelong enough to just thread into our outers) whats our pitch?
low profile head 4" x4" square.
price would drop to around $300-350 per unit if we get a group buy- at 10 or above. thats a WHOLE lot better.
before we have a "are you in or are you out?" group buy discussion, we need to have exact specs neccessary, not what i've done so far with a tape measure. I think we would all agree on a faster ratio, but how fast?
also need overall length of the threaded part of the shaft goin into the outer tie rods.
the only other issue i can think of is that some company does have a rack kit for a lot of money and are we just redundantly engineering what they have already done. - can't remember who that was.
then there is the steering column issue. it'd be great if we found one solution and everybody used it. there is power (and price reductions) in numbers. if we could get the locations the same for SR's and L's the linkage could all be the same just mounting to the crossmember would be different.
any pivot-point width we want.
nearly any ratio we want - anywhere from 2:1 to 6:1 (i don't know what that means either, just what he said) basically slow to really fast...
any inner tie rod length and possibly thread we want. (his are 14mm x1.5 and could be madelong enough to just thread into our outers) whats our pitch?
low profile head 4" x4" square.
price would drop to around $300-350 per unit if we get a group buy- at 10 or above. thats a WHOLE lot better.
before we have a "are you in or are you out?" group buy discussion, we need to have exact specs neccessary, not what i've done so far with a tape measure. I think we would all agree on a faster ratio, but how fast?
also need overall length of the threaded part of the shaft goin into the outer tie rods.
the only other issue i can think of is that some company does have a rack kit for a lot of money and are we just redundantly engineering what they have already done. - can't remember who that was.
then there is the steering column issue. it'd be great if we found one solution and everybody used it. there is power (and price reductions) in numbers. if we could get the locations the same for SR's and L's the linkage could all be the same just mounting to the crossmember would be different.
- 510-Trevor
- Supporter
- Posts: 1373
- Joined: 03 Mar 2007 18:34
- Location: Calgary, Alberta
like these guys? http://www.dgrfabrication.com/benz-tech wrote:...the only other issue i can think of is that some company does have a rack kit for a lot of money and are we just redundantly engineering what they have already done. - can't remember who that was. ...
1972 Yellow 4dr
- zootowndime
- Posts: 921
- Joined: 12 Oct 2005 19:08
- Location: Missoula, MT
I was just trying to quckly browse through this thread, but i couldn't find it. I think someone had already mentioned dgr and the owner told them that they pretty much use the mr2 setup.
I would be very interested in the group buy but i agree that this must be the ulitmate rack! What the specifications of the rack might be i am not sure, but I am glad there you guys out there that are good with numbers.
I would be very interested in the group buy but i agree that this must be the ulitmate rack! What the specifications of the rack might be i am not sure, but I am glad there you guys out there that are good with numbers.
Alex King
www.brewedmotors.com
www.brewedmotors.com