Was with several 993 owners this past weekend at a DE event and it was recommended to change the "rear subframe assembly" bushings to an ERP polybronze type. They also suggested doing something similar in the front but I don't remember the terminology for the suspension location. I use the car solely for track events and was told this replacement would provide much better handling in the turns.
Has anyone done this or have further input? Is this a DIY type of project?
Thanks guys!

 

Hi:

ERP parts are not poly-bronze; they use spherical bearings (monoballs). Elephant Racing makes poly-bronze but nothing for 993's, yet.

ERP's solid sub-frame mounts change the rear caster for improved kinematics on the track and less movement under load from race tires.

If your car is used exclusively for the track, I would recommend:

1) ERP front A-arm monoballs
2) ERP rear kinematic links, camber links, and toe-control links
3) ERP Camber plates/monoball mounts

These changes make a huge difference in the stability of the car on the track.

(edited for clarity)

 

Maybe they were referring to the rear subframe mounts. I had ERP rigid rear subframe mounts installed.

But if your car is solely a track car, they probably meant the spherical-end links that steve mentioned. (BTW Steve referred to "ERP's spherical sub-frame mounts " but I think that was a typo; no such thing exists AFAIK)

You can either install monoball cartridges in your existing links (see first pic below) or buy adjustable-length links with monoballs already in them (2nd pic).

 

Eric, Steve; thanks for your input. Do you recommend replacing the links or just going with the monoball inserts?
Eric, do you also have a picture of the front control arms where the monoball inserts would go similar to the rear diagrams you sent?
Do you guys think this is a DIY project or is it better left to the experts?

 

The ERP links provide a great range of adjustment which is really important on lowered cars.

The front monoballs are inserted after the rubber bushings are pressed out and get staked in place.

You'll get many opinions on this but I'd leave this job to someone who has successfuly done this before. The ERP rear links however, can be installed by any competant DIY'er.

 

lol..



I remember hearing Eric do a lot of cussing when he did the front's on his former 993 and that was with all the good shop equipment and press, etc.

 

Dammit, I need those, but cha-ching...

 

um yeah.. why do you think I'm buying a new set of front a-arms instead from another rennlister instead this go around.. can't afford it yet

 

Steve is the man for Motons and ERP. Only the finest for his customers. Me...just waiting for that bonus check. Then it's spend spend spend in Oregon.

 

Oh and don't forget GT2 evo uprights and tie rods to correct the bump steer after lowering.

 

Meh. I'd spend my money elsewhere. Like Motons, or something that will make a bigger difference in lap times.

 

Agreed. But eventually you'll need to go whole-hog and get the ERP kit. Because I don't have the rear suspension monoballs with my Moton-equipped car, I can't get any less than 2.5 degrees of negative camber from the rears.

Steve is the go-to guy for Motons and monoballs. Like the old Gary Larson cartoon, when you get your Motons in, you'll be scratching your head like a bear in the woods who encounters a soda machine: a dim brain, too many choices and no spare change. Steve provides enlightenment, narrows down the innumerable choices and provides spare change in the form of invaluable phone time.

 

Steve has helped me sort out my mess of a car via many hours of phone conversation.
A+ for Steve

 

yup yup

...eventually I'll have ERP bearings but higher on my list is Motons

 

Eric: Yah, shocks make a big difference but as Mark says they only go so far. I've had issues with alignment adjustability lately too due to how low the car is (who would have thought setting less camber would be a problem). Our stock cars just don't have the components to get good suspension geometry when really low. I just had all the rear redone with mono-*****/Heim joints and am now doing the front and going to EVO uprights and appropriate bump steer bits. It's likely it will get returned to me with firmer springs too (so less range of travel and less change in toe and camber/contact patch over the travel range).