TA22 + rack and pinion

[LeeRoy]

When I went from lock to lock it was stopping on those lock limiters/adjusters. However, the ends of the tie rods where the ball joints are were only about 10mm away from the rack tube.housing. So, even if you adjusted them some more it wouldn't give you a great deal more lock.

Q. Being shorter, do the AE86 power steer arms give you less mechanical advantage?

[Rob KE25]

Q. Being shorter, do the AE86 power steer arms give you less mechanical advantage?

Yes, that's right- in turms of steering effort required. So the steering will be 'heavier', meaning you'll need more muscles to turn the wheel. But you won't have to turn the steering wheel as far to get the front wheels to move the same angle.

If I remember correctly, AE86 knuckles are 132.5mm,Some coronas have up to 147.5mm. Celicas vary somewhere between these two, perhaps some at 132.5mm as well. AE86 p/s ones 115mm. The shortest knuckles I know of are KE20/25 (around 110mm) but they have a different bolt spacing so won't fit unless modified.


In Practise, this is what happens when you change the steering knuckles to power steering: Roughly, you'll need 1/3 more muscles to turn the wheel, but instead of turning the steering wheel 1/2 a turn for a particular corner, you'll only need to turn it about a 1/3 or a turn with the p/s knuckles.

[bigmat]

if you leave in the standard 28 or ra steering arms you will have turning issuse in tight places. i couldnt even do a u turn in mine untill i changed to ae86 power arms. i have ke70 r and p with power steer. hope this helps

cheers mat

[Sam_Q]

When I went from lock to lock it was stopping on those lock limiters/adjusters. However, the ends of the tie rods where the ball joints are were only about 10mm away from the rack tube.housing. So, even if you adjusted them some more it wouldn't give you a great deal more lock.

Q. Being shorter, do the AE86 power steer arms give you less mechanical advantage?

well I stand corrected, this is a good sign then.

[ta22max]

I finished putting the rack and pinion conversion into my TA22 which Sam fabbed up for me.

With TA22 control arms it has 3 degrees of neg camber with my T3 camber plates all the way to the inside, and 1.5 degrees to the outside. Perfect!

I had to put AE86 steering arms on it as with the struts in full droop you cannot get the tie rod ends into the steering arm.

And because the AE86 steering arms stut bolts are 5mm further inboard compared to the TA22 ones they hit on the caster arm nuts. I re drilled my caster arm bolt holes and my sway bar bolt holes 30mm in to suit the 60mm overall track increase with the KE70 crossmember.

Over all very happy. Thanks Sam.

[Sam_Q]

thanks for the feedback Max now didn't you have Corona arms in there or something?

interesting about the fouling of the steering arms, might you be able to give me a rough measurement of the LCA inboard bolt to the center of the outer lower ball joint. I want to compare it to the KE70 arms as I may just grab them in the future as well with the crossmembers. Are you sure you want that track increase? I can cut and shut your arms if you like.

[ta22max]

No I am happy with the track increase thanks Sam, Its the desired camber im after.

I did have some XT130 control arms in it originally that had been lengthened 20mm. So thats 30mm longer than an AE86 control arm. With them i had 7 degrees of neg which was rather excessive not to mention the tie rod ends where not long enough.

[Radar]

So hows the T series mounts going?? How long till I can buy one of these?
Although 3deg neg is fair excessive? Anyway to knock it back a degree to say 1.5~2 deg neg??

[unbreakable]

so hows the t series mounts going?? How long till i can buy one of these?
Although 3deg neg is fair excessive? Anyway to knock it back a degree to say 1.5~2 deg neg??

......
X 2

[ta22max]

Sorry I did not make it clear I have 3 degrees with my adjustable camber plates adjusted to full neg with OEM strut tops you will have 1.5 degrees

[Sam_Q]

only 1.5? isn't that like ideal? if so that would be strangely convenient.

Can anyone else confirm ta22 arms are actually the same length as stock ae86 arms and fit fine? well now we know Corona ones don't work.

Radar: to be honest many weeks, I have to do work on my house first. I will send you a message with the finer details though.

[af300e]

I'm quite sure that ta22 LCAs are the same length as xt130 which makes them 10mm longer than ae86 arms.

Can measure tomorrow to confirm.

[Sam_Q]

would be really good if you could do that, it would be handy too as that would mean people could run ke70 arms which would be shorter.

[TA22 GT]

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.

Hi,
Nice work..A couple of questions -

Have you made this to fit into a TA22? If so, I assume the KE70 X member bolt holes line up to the TA22? Also, what engine is this suited to?

I'm no steering expert, but is the angle of the steering arms an issue the way this is now? Eg With the wheels in central position the steering arms are not parallel to the x member, should they be?

Cheers,
Simon

[Sam_Q]

correct me if I am wrong Lee roy but it appears you have yet to modify it to bolt into the TA corrrect?

TA22 GT: if it's any use to you the KE70 and all the other simular racks all have a single thickness in the ends of the crossmember where they are bolted to the body, this is the main steel section and reinforcing plate. TA22's on the other hand have a sadwidge type construction of sheet metal on either side of a crush tube. Also the mounting holes are inline on a KE/AE and angles inwards on a TA. Lastly TA's use M10's, The others have M12's

hope that's of use for someone