Big development tonight. Lessons learned but it will be an easy resolution.

I received my new front arms the other day from European Parts Solutions. I stumbled upon their video on YouTube, and I ended up going with their arms with the ploy bushings already installed. I tried to press out the old bushings and bent the stock arms and damaged the bushing hub. I said screw this and bought a solution that was already assembled and warranted for 5 years.





This was unfortunately where the good times ended tonight. When I went to install the new arms onto the car, I quickly realized the 991 PASM bushings are 17mm wider than the fork in the stock 996 arms.



I was seriously panicked at this point. Being this far into the project and feeling like I screwed it all up. Well, a quick search of 997 and 991 front control arms revealed that the forks are indeed wider on the newer models. EPS offers the 997 arms with the poly bushings upgraded, so I will be in contact with them tomorrow to discuss solutions. Looks like the 991 PASM inner bushings are 60mm wide, and the 996 bushings and fork openings are about 43mm wide. The 996 stock arms are 14.5” from bolt center bore to bolt center bore. Now that I have cleaned up the crap in my pants and gathered myself, I’ll just have to swap the 996 arms for 997 or 991 arms. Whichever is dimensionally a solution to this upgrade. This is yet again another example of the how much more robust that 991 arm is over the 996 arm. I have included a couple examples of the 991 and 997 arms from FCP website below. You can clearly tell the fork is larger than the 996’s now that I know and am looking specifically at it.




Its so clear to me now, but yes I totally failed to measure the width of these the first go around.

 

Fascinating, chin up OP you'll get there

 

What if the 997 version is a different length? You also realize that the 991 control arm was only used in the front? Be sure to order the longer bolts PET shows 95 vs 73.

Also google "eps control arm failure"

 

It doesn’t matter where the 991 arm was used. It was used front and rear on the 996. That’s what I need to look at. I am aware the length is a factor. That’s why I intend to figure out the solution to this issue sometime today. In terms of your EPS control arm failure, I was unaware of this. Just saw the posts you wanted me to see and I’ll be sending these back and going with TRW arms. I’ll just order the 997 arms for front and see what I get. The arm just needs to be 14.5” from bolt center to bolt center. Either way I’ll figure out the exact solution to this issue very quickly.

 

https://www.elephantracing.com/porsc...ive-anti-squat


If u scroll down u will see a possible solutuon but im sure it comes at a big cost. Good luck.

 

The elephant arms don’t work with 991 LCA.
Only if you replace the central bushing with the lower height one.

 

They show a part# for the 991 front?

 

They work but need their pucks.

 

I think they'd work with the standard 991 LCA, just not with the PASM version. My LCA's did not require any special locating arms.

 

I am working with FCP Euro right now to get some measurements and pictures. They are able to walk back into the warehouse with a tape measure and check specs I will have a solution today and report back.

 

I may have missed it, but why use the PASM part versus non-PASM?

 

Ok according to the PET all Non-GT3 997 and 991 use the taller central bushing in the front LCA. If the 997 front diagonal is the same length as the 996 you should be able to use those in the front and back of a 996.

The 997 rear LCA has the same height bushing as the 996, they are essentially the same arm. The 997 rear diagonal arm would not fit these 991 arms.

I think what @wdb purchased was an updated 996 arm using the newer arm design with the shorter central bushing. You can even see the Porsche label designates it with a 996 number.

 

I’m a little confused can someone post part# of arms that work with the least prep work please

 

I have some 997 and 996 diagonal/caster arms and they are the same length, just wider where they mount to the center bushing...

So yes, the 997 diagonal arms should make this 991 LCA part work....

 

I have all the info and part numbers to make this work now. Let me get it all in and bolt it all up before anyone burns me at the stake for being wrong. Lol!! The 991 fork arms look to be 1/2" shorter, but we measured the 997 arms and they are 14.5" bolt-to-bolt just like the 996 arms. I have pictures FCP sent me to confirm this. You will also need to purchase the longer 997/991 control arm bolts since the 996 bolts are too short.

This is my exact list of parts for this upgrade:

4x 991 Lower Control Arm (TRW - JTC1619) - 991.341.341.02
4x 997 Tuning Fork Arms (Meyle - 4160500006) - 997.341.043.00
4x Longer Control Arm Bolt (OEM Porsche) - PAF008970
4x Control Arm Nut (OEM Porsche) - 99908444909


TRW 991 arms

Meyle 997 arms