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993RS uprights on 964

Hi,
I am installing 993RS uprights onto my 964. I've been searching the forums and have found different ways on how people have done this on their cars. I've seen people go with 993 longitudinals and A-Arms but I donít want the track width to be pushed out. I have seen some people modify 993RS inter and outer tie rods to work. Does anyone make an inter and outer tie rod, that is made for 993RS uprights on a 964 without out the need for modifications? Thanks

Old 07-12-2020, 03:12 PM
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Yes. ERP and tarret sell full tie rod kits.

The ONLY reason to use the 993 longs is if you want your front end pushed out 10mm per side. It’s possible if you have aggressive wheel fitment this causes issues.

You can see my thread on rennlist (search my user name there and look for 964 thread) with lots of details.

But, to keep it simple i would use the ERP monoball inner and ERP bump steer outer with the bump correction. Order the spec for the setup you have. Ira at tarret sells and will make sure you get the right parts.

The main issue is the stock rods are too long due to the steering linkage placement
Old 07-12-2020, 04:02 PM
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Quote:
Originally Posted by spyerx View Post
Yes. ERP and tarret sell full tie rod kits.

The ONLY reason to use the 993 longs is if you want your front end pushed out 10mm per side. Itís possible if you have aggressive wheel fitment this causes issues.

You can see my thread on rennlist (search my user name there and look for 964 thread) with lots of details.

But, to keep it simple i would use the ERP monoball inner and ERP bump steer outer with the bump correction. Order the spec for the setup you have. Ira at tarret sells and will make sure you get the right parts.

The main issue is the stock rods are too long due to the steering linkage placement
Spyerx,
Thanks for the quick reply! Your thread looks like a wealth of information, I need to read through the entire thing. I am planning on upgrading to 993 ďbig redĒ calipers in the front 993 C2 calipers rear and BBS E88 18x8 +51 front 18x10 +51 rear. Havenít decided which coil overs yet but thinking MCS.
Old 07-12-2020, 05:20 PM
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Mcs are good. Key is the setup and calibration for all these adjustable shocks.

The thread is long :-)
Old 07-12-2020, 05:42 PM
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Iím still wondering why some people canít get enough - camber without going to the 993 longitudinal and same people can. Foxman couldnít. but Spyerx could.

Spyerx- do you run erp top hats as well? And what camber are you running?

Pete
Old 07-12-2020, 08:12 PM
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Yeah ERP tops. -2 or 2.5?
Old 07-12-2020, 08:31 PM
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I am doing this now. MCS 3WC, Tarett/erp upper plates. ERP/tarett tie-rods, factory RS/EVO uprights etc. I got the factory units cheap so decided they would be good enough.

This is a widebody build using 993 longitudinals which push the front end out another 12.5mm. Although this will work either way.



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Old 07-13-2020, 04:28 AM
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Spyerx-

Could you get more- say if you wanted 3?

I just got my uprights in the mail today- can't with to do this mod. I'm going to go with MCS too. Getting booster and related parts for the brakes.



Pete

Last edited by Peteinjp; 07-13-2020 at 04:33 AM..
Old 07-13-2020, 04:29 AM
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I am not sure how it works on the narrow body settings but yes. I believe you might need to grind the shock tower top to allow that much - camber. In the WB settings the tub doesn't interfere like it does with the narrow body.
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Old 07-13-2020, 04:36 AM
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Jus trying to figure this out so I don't have to go back and take it apart again. Don't really want to use the 993 longitudes if not needed- extra expense and changes wheel offsets.

Pete
Old 07-13-2020, 04:50 AM
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Quote:
Originally Posted by Peteinjp View Post
Jus trying to figure this out so I don't have to go back and take it apart again. Don't really want to use the 993 longitudes if not needed- extra expense and changes wheel offsets.

Pete
Yeah I donít want to use the 993 longitudes either. I already got my new wheels, and donít want to have to figure out new offsets for the front.

I am still collecting parts, before I rip the suspension apart.
Old 07-13-2020, 09:56 AM
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My shock towers are ground a bit.

Yeah I can get more. It's not maxed out.

I believe BBI is now selling a different lower link which may be adjustable (connects to a-arm and then to upright). You'd need to check w/ them.
Old 07-13-2020, 11:19 AM
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See last few posts for some pics:
https://rennlist.com/forums/964-forum/904951-my-964-c2-transformation-build-thread-37.html#post16770560
Old 07-13-2020, 11:24 AM
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Quote:
Originally Posted by Cobalt View Post
I am not sure how it works on the narrow body settings but yes. I believe you might need to grind the shock tower top to allow that much - camber. In the WB settings the tub doesn't interfere like it does with the narrow body.
i see you have the two camber adjustment bolts on the plate towards the rear of the car while the instructions and every other install i've seen has them towards the front? any particular reason for this?
I'm about to do this mod in the next week or two. i have a narrow body but with the 993 longitudes. it's been a slight inconvenience having them to say the least. I should have left well enough alone way back when i swapped them.
I'll be using the same camber plates so I will have to try different configurations until i get it to work properly
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Old 08-02-2020, 12:00 PM
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^^^ Honestly I have several sets and none came with instructions. Although I did not install these this way this was done by another shop years ago and I never questioned it. The most recent set I purchased came assembled this way and if I rotate them the other way around that would be for the outboard or wide body configuration. I see Spyerx has his the other way but in either case they seem to require modifications if you want more negative camber. I would guess I need to disassemble and flip the plates to make the single hole towards the fuse box. Not sure why they ship them assembled this way if they don't expect you to use them like this but instructions I guess would have explained that.

I appreciate you pointing that out. I just assumed the other shop installed them properly and this way did not impact the caster which these are supposed to help with or impact my camber since it is a street car.

I will reach out to tarett and see what they say. Many thanks.
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Old 08-03-2020, 04:33 AM
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Quote:
Originally Posted by Cobalt View Post
I am not sure how it works on the narrow body settings but yes. I believe you might need to grind the shock tower top to allow that much - camber. In the WB settings the tub doesn't interfere like it does with the narrow body.
That's backward from mine

Mode's

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Old 08-03-2020, 12:18 PM
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I didn't have a chance to call tarett yesterday but will report back what I find. I am assuming mine are reversed and just never questioned it. But the more I touch, I find to be incorrectly done by a shop I trusted and had a great reputation for a long time. The 993 seems to have a round opening vs the 964 which is oval or has flat sides so apparently no need to modify the 993 towers to make them work.

So I assume I will need to disassemble and flip the plates to mount them properly.
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Old 08-04-2020, 03:45 AM
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since I have the 993 longitudes I had to install the original hats with the strut nut towards the outside on the car as opposed to all other 964's that have them on the inside. So I'm guessing I'll have to use what would normally be the left erp hat on the right and the right on the left. This way I keep the strut towards the outside while keeping the two sliding bolts facing the front of the car.
In my original configuration I could only get a max of 1 deg of negative camber with the pss10's I have installed. The extra track width and limited camber has severely limited my wheel options (due to offset) and today I really wish I hadn't done that and unless I get another 964 to swap all the parts back to original I have to work with what I have
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Old 08-04-2020, 05:10 AM
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Actually the 964 unlike the 993 uses the inside mounting for narrow body and outside for wide body. The hats need to be in the same position as the longitudinals which can be mounted either inboard for narrow and outboard for WB. AFAIK the 993's are all mounted inboard no matter if it is wide body or narrow. They extended the track by changing the longitudinals to push the track out further. Odds are if you rotate the hats so they are inboard on a NB car you will gain more clearance.

I am not sure how these were delivered since I did not install them initially. The set I recently got for my track car were set up so the pivot point is towards the front but these are mounted in the WB or outboard configuration. If I rotate them for narrow body they would be as Spyerx and Bill has shown. Unfortunately, Neither car is available to put on the alignment rack so I have no way of knowing what impact it is having one way or another. I am assuming I would have picked up on a problem once we got to this stage.

I did track the narrow body car for over a decade with these set as I pictured I will be pissed if I find I could have put down better times if this makes any significant difference in the suspension geometry.
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Old 08-04-2020, 05:49 AM
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The ERP plates are mounted correctly on your turbo Anthony. If you mounted them the "normal" way you would potentially have too much negative camber.

Last post from the horses mouth:

https://rennlist.com/forums/racing-and-drivers-education-forum/151224-erp-camber-plates.html

Pete

Old 08-05-2020, 06:00 AM
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