TA22 + rack and pinion

[TA22 GT]

Yes, track will increase by 40mm each side. If you have flares don't you want to have less camber but more track so the tops of your wheels are also out further? I think it would look a bit odd to have a lot of negative camber and then have the top of the rims set in too far....

[Ashh]

So I'm finally getting around to doing this.

@ TA22 GT - nice job. The pictures on your fb page
How hard was it to move the LCA mounts? Did you cut off the originals and re-fabricate new ones and then weld them on?

It's just I've got a Rack and x-member from a KE70 lined up for tomorrow, but if I don't need the x-member I'd rather not buy it.

How are engineers going to feel about moved LCA mounts and welded on rack mounts (Modded TA22 x-member) as opposed to a x-member with the ends cut off and T-series engine mounts welded on (KE70 x-member)?

[Ashh]

edit: sorry just saw that you put a lot of details in further down on your FB page.

Looks like quite a process. Seeing as you still used the KE70 rack I'll just buy it tomorrow and then eyeball them both when they're sitting in front of me as to which approach is going to be easier.

How hard was it to modify the steering column to work?

[TA22 GT]

The steering column mod is also on my page. Not as difficult as the cross member. The TA22 x member is a bit heavier, I chose to keep the original member as I wanted to keep it looking like a factory fit and also I liked how it's heavier duty. Having said that, It's much easier to use the KE70 member as the mounts and rack brackets are already right. You just need to cut the member a bit shorter and drill some new holes so it fits the TA22 body. I did shorten my LCAs as I didn't want to increase track by the full 40mm each side...

[Ashh]

Alright - so I started this, but then canned it because of the track problems that it gives when I try and engineer it.

I think I have a solution that doesn't involve cutting/welding the LCAs?

KE70 LCAs!

The Ke70 has a track of 1320mm, the TA22 has 1280mm. So if I put in the KE70 xmember and LCA's it should be 1320 as well (I think?).

That's a 40mm difference, largest allowed is 25mm, so get some slightly offset wheels inwards to take up the 15mm extra. Then it will have 1305 track, R&P steering and be engineered!

Anyone see any glaring problems with that? (like... do KE70 LCA's fit TA22 Steering knuckles?)

[Major Clod]

Wheels with a higher positive offset can foul on brake calipers and struts, so you'll need enough room on the inside of the wheel / tyre.

Steering knuckles can also affect track due to location of the ball joint hole vs strut holes. I know AE86 PS knuckles give 20mm less track overall than RA23 simply due to this. You'll also need to consider how the hubs affect track. It might be that the KE70 keeps a narrow track due to shallower hubs or knuckles, not just LCA's.

All in all you'll probably just need to measure it all up and see how it fits unfortunately!

Alright - so I started this, but then canned it because of the track problems that it gives when I try and engineer it.

I think I have a solution that doesn't involve cutting/welding the LCAs?

KE70 LCAs!

The Ke70 has a track of 1320mm, the TA22 has 1280mm. So if I put in the KE70 xmember and LCA's it should be 1320 as well (I think?).

That's a 40mm difference, largest allowed is 25mm, so get some slightly offset wheels inwards to take up the 15mm extra. Then it will have 1305 track, R&P steering and be engineered!

Anyone see any glaring problems with that? (like... do KE70 LCA's fit TA22 Steering knuckles?)

[Ashh]

Interesting. Hadn't considered the knuckles changing things.

However now, if I put in AE86 knuckles would that give a another 20mm reduction in track (for a TA22? I assume the RA23 and Ta22 would have the same/very similar knuckles?). Do you know if this is true for their non-PS knuckles? How heavy would the steering be with AE86 PS knuckles with a KE70 rack? Un-manageable?

This is good though! Other ways to reduce track, maybe this could come under without even needing weird wheels!

[WDE_BDY]

For comparison, I have full KE70 swaybar/caster arms in my KP Starlet (using shortened KE20 LCA's as the ball joint matches). The track width difference of around 60mm is almost completely due to steering arms and struts, KP Starlet is narrower than a TA22.

Callum

[WDE_BDY]

However now, if I put in AE86 knuckles would that give a another 20mm reduction in track

You are confusing steering arm length (measured balljoint to tierod so front to rear and affect how much you turn for each turn of the steering wheel) and steering arm offset (the alignment of the balljoint hole compared to the strut bolt holes, can be pushed in or out from the centreline of the car). I believe the in/out spacing of AE86 arms are the same between power and non steering arms.

Callum

[TA22 GT]

Alright - so I started this, but then canned it because of the track problems that it gives when I try and engineer it.

The Ke70 has a track of 1320mm, the TA22 has 1280mm. So if I put in the KE70 xmember and LCA's it should be 1320 as well (I think?).

I think your measurements are wrong. The distance between LCA mounts are 80mm wider on a KE70, so unless KE70 LCAs are 40mm shorter than a TA22 then the track will be wider by 40mm each side. Im pretty sure LCA length is the same on a TA22 and KE70, maybe someone else can confirm this....

[Ashh]

The second post in this thread http://www.toymods.org.au/forums/thr...or-engineering says that it's 1320

[WDE_BDY]

For reference, the TA22 diff is around 40mm narrower than a KE70 diff. I would expect the front track to be a similar difference. There is probably a lot of difference in offset in the KE70 steering arms and struts compared to TA22 but I haven't had them side by side. Without that info it is hard to directly compare track widths as wheel offset, steering arm offset, LCA length and hub design will all impact.

Callum

[TA22 GT]

The second post in this thread http://www.toymods.org.au/forums/thr...or-engineering says that it's 1320

Track isnt the best measurement to refer to as offset also has an impact on track. You need to refer to the distance between LCA mounts and actual LCA length to compare properly...

[Ashh]

you're correct.

Hmmm it would make sense if most of the difference was in either the strut/hub assembly or the LCAs. I can't see a steering arm having a hugely offset ball joint. All the ones I've seen the ball is in line with the strut holes.

Does anyone have a KE70 to measure the LCA?

Edit:

according to this post: http://www.rollaclub.com/board/topic...nd-neg-camber/

KE70 arms are 290mm while TA22 ones are 300.

So a
TA22 = 1280
TA22 w/ KE70 subframe 1280+80 = 1360.
TA22 w/ KE70 subframe and LCA = 1280 + 80 -20 = 1340

Still need to find 35mm to take off. And that's assuming that the XT130 struts (which I have on my TA22) have the same offset as the TA22 ones. Which I don't think they do.

edit2: stock TA22's were around a +30 offset right? Has anyone successfully mounted +50 wheels? (probably not as I can't imagine why you'd want to...)

["Z" UTE]

Ashh, a 50mm positive offset 7 inch wide wheel fouls big time on the XT130 strut, 25mm positive offset is about all you can get away with.

We ran a 42mm pos offset set of wheels but had to run a 25mm spacer up front so that gave an effective offset of 17mm.