TA22 rack and pinion conversion

Toyota Celica technical talk and help.
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orange
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TA22 rack and pinion conversion

Postby orange » Sun Feb 12, 2012 8:55 pm

I've read the toymods thread for this and its just too long and hard to keep track of peoples' vague memories of "such and such was too long", "no it was to short" blah blah.

So i thought it'd be nice to have a proper thread on this subject... none of this vague, soft, brown stuff, with hours of posts going no where.

I'll cut n paste some conversions i've found. I'm sure HKS7MGT can add his knowledge to this thread, especially with regard to the AE86 steering arm/knuckle. I'm interested in that because of the availability of the T3 parts.

Option 1:
Reference:
http://www.toymods.org.au/forums/forum-members-rides/13231-my-3s-gte-ta22-rust-farm-6.html
LeeRoy(toymods) wrote:Ok, here is my rack and pinion as it currently stands.

KE70 crossmember, shortened
KE70 rack, equally shortened
KE70 rack ends
TA22 control arms
TA22 steering arms.

The crossmember has had a piece cut out of the very middle of it, then rewelded (tacked) back together. Then the steering rack is totally dismantled for machining.

The external tube can be removed from the gear/worm drive housing and then shortened. Once done it presses back into the housing. The rack shaft once has been shortened on the passenger side, then rethreaded and remachined. On this end the drive gear stops and it's just a solid bar, so there is enough meat to shorten it. The thread needs to be retapped so you can bolt the rack end back in, and the spanner sides machined in so it can be help and tightened.

So, it's basically the same as a KE70 in terms of geometry, only narrower. You can see the relative position of the LCA pivot and rack pivot in the photos. Since ackerman is determined mostly by steering arms it remains basically unchanged. It will however be slightly different (for the better) as a result of the more linear movement of the rack in comparison the the steering box.

Still to be done is some gusseting and reinforcing of the crossmember, then cleaning, painting, and installation of new bushes and ball joints.

Enjoy!
Image

....Now, once the rack and front suspension went back in I had some issues with the AE86 power steering arms not having enough offset compared to the stock TA22 ones causing the rotors to hit on the control arms. The 86 ones bring the strut in by around 4 mm, whereas the TA22 ones are a 0 offset - I will revisit this issue later and maybe get some custom arms machined up if I can't find something to suit.


Option 2:
KP61 Engine cross member with rack and pinion into RA29
reference:
http://www.jdmlegends.com/blog/?p=517
KP61 engine cross member (with steering rack) appears narrower then the RA29 engine cross member which is why i'm listing it.
Image
Image


Option 3:
MWP's
TA23 xmember & AE82 rack
Image


Actually now that i see it laid out like this it all makes more sense.

I think it would be nice to attempt to use an TA22 engine cross member to keep things simple. The KE70 engine cross member seems to yield too many challenges. TA23 with AE82 rack looks nice. The KP61 looks good because it comes with the rack already mounted, how hard could it be to take that off and put it on a TA22 engine cross member i wonder.

Gonna have to see if i can get LeeRoy to elaborate on his AE86 steering arm problem...or get a picture of that problem.

MWP would the AE82 steering rack be too wide for TA22?

Handy link here will answer some questions: (lower control arm length database)
http://www.toymods.org.au/forums/tech-conversions/13452-lower-control-arms-length-database.html

HKS7MGT do you recon the AE86 short steering knuckle would work with a steering rack? i can't visualise the full extent of the problem you had with that.

I'll leave it at that for now, i'm just bout having a brain haemorrhage keeping track of all this and getting interrupted every 1-2mins at work :)

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orange
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Re: TA22 rack and pinion conversion

Postby orange » Wed Feb 15, 2012 10:56 pm

According to Sir Sheepers someone in NZ has done an AE82 to TA22 buy trimming a small amount off each end of the rack. eg 10mm a side. Seeing as its such a small amount this seems ok.

That leaves the AW11 and KP61 racks to be inspected...

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orange
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Re: TA22 rack and pinion conversion

Postby orange » Wed Feb 15, 2012 11:21 pm


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MWP
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Re: TA22 rack and pinion conversion

Postby MWP » Thu Feb 16, 2012 12:02 am

orange wrote:According to Sir Sheepers someone in NZ has done an AE82 to TA22 buy trimming a small amount off each end of the rack. eg 10mm a side. Seeing as its such a small amount this seems ok.


Yup, do that :)
You might not have to modify the housing when only trimming off that much which would be a bonus.
Mark.
Daily: Toyota RAV4 ACA22R
Project: Celica GT4 ST185, Celica RA28 (1UZ-FE powered)
Previous: Camry VZV21R, Starlet GT Turbo, Corona RT104
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najje
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Re: TA22 rack and pinion conversion

Postby najje » Wed Oct 07, 2015 3:11 pm

Reopening a very old thread, would a AE71 rack suit a TA22 conversion?

There is one on gumtree up for sale and I have been unable to find KE70 racks available when looking over the past few months.

Cheers,

Rob

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swan86
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Re: TA22 rack and pinion conversion

Postby swan86 » Wed Oct 07, 2015 7:51 pm

Should be the same the mounts on the cross member are different for the motor

bigmat
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Re: TA22 rack and pinion conversion

Postby bigmat » Sun Nov 01, 2015 2:01 pm

Buy it

How's this I found a spare power rack for for an ae71 in my shed the other day. I run a power ae71 rack in my 28 with no probs

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pagie84a
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Re: TA22 rack and pinion conversion

Postby pagie84a » Wed Dec 09, 2015 10:56 pm

Do the 71 power racks bolt straight onto 70 rack I been hunting for an 86 one to go power with no luck

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MWP
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Re: TA22 rack and pinion conversion

Postby MWP » Thu Dec 10, 2015 8:01 pm

You could go electric power steering with a manual rack.
It's a bit of work, but means you don't need to run any PS pump or hydraulic lines in the engine bay.
Mark.
Daily: Toyota RAV4 ACA22R
Project: Celica GT4 ST185, Celica RA28 (1UZ-FE powered)
Previous: Camry VZV21R, Starlet GT Turbo, Corona RT104
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pagie84a
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Re: TA22 rack and pinion conversion

Postby pagie84a » Thu Dec 10, 2015 8:03 pm

I have the 1uz it's got ps pump and hoses and shit everywhere anyway

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Re: TA22 rack and pinion conversion

Postby MWP » Thu Dec 10, 2015 8:11 pm

Exactly... go EPS and you can remove all that crap.
Mark.
Daily: Toyota RAV4 ACA22R
Project: Celica GT4 ST185, Celica RA28 (1UZ-FE powered)
Previous: Camry VZV21R, Starlet GT Turbo, Corona RT104
Treasurer of the SA Classic Celica Club.

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pagie84a
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Re: TA22 rack and pinion conversion

Postby pagie84a » Thu Dec 10, 2015 8:15 pm

Hmm guess I'll look into it see how hard it'll be

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MWP
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Re: TA22 rack and pinion conversion

Postby MWP » Thu Dec 10, 2015 8:19 pm

I've done it...
It's not easy. You have to mount a big motor and control box under the dash, use a different steering column, etc.
But it's worth it i think. You get tunable steering assistance (assist vs car speed), no hydraulic lines or pump, and 0 maintenance.
Mark.
Daily: Toyota RAV4 ACA22R
Project: Celica GT4 ST185, Celica RA28 (1UZ-FE powered)
Previous: Camry VZV21R, Starlet GT Turbo, Corona RT104
Treasurer of the SA Classic Celica Club.

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pagie84a
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Re: TA22 rack and pinion conversion

Postby pagie84a » Thu Dec 10, 2015 8:22 pm

It's turnable now stationary with the 8 in it but I'm lazy. Do you have a link to a how to or any info

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Re: TA22 rack and pinion conversion

Postby MWP » Thu Dec 10, 2015 8:31 pm

Well the 1UZ isn't that much heavier than a 18R, so thats not surprising.

No links or info, I worked it all out from scratch.
I used the EPS unit out of a 2005 RAV4, but using one from a similar age Corolla would be a better idea as its smaller.

Image
Image

None of that is visible with the dash reinstalled.
Mark.
Daily: Toyota RAV4 ACA22R
Project: Celica GT4 ST185, Celica RA28 (1UZ-FE powered)
Previous: Camry VZV21R, Starlet GT Turbo, Corona RT104
Treasurer of the SA Classic Celica Club.


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