potent951turbo

Question for those of you familiar with the M030 setup on the 968. Will I need to reindex the torsion bars for sure? I want the car to sit nice and low but was just curious if it's pretty much a given that I will need to drop the rear to index the t-bars? I've heard the added rear coil spring will raise up the rear a fair amount. Seems like just using the eccentric isn't the "correct" way to go about it.

ckkrause

I reindexed a 951 i had a few years ago and I used a method found here somewhere where you didn't have to drop the subframe... I think it was by the Elephant guys.... I reindexed twice, (my bad...) in one day...using that method...

-Chuck

mikew968

The best way is to just get rid of the t-bars or have them milled down so they are insignificant.

potent951turbo

I am putting everything to factory spec M030 so I do not want to render the t-bars useless.

PorscheG96

I might have a definitive answer for you in a few weeks and I just don't buy the fact that Porsche indexed torsion bars differenlyt for m030 and non-m030 968's. Imagine how much more effort that would be versus simply adjusting using the spring plate eccentrics.

potent951turbo

Yeah please keep me posted, I'd love to hear what you find out. Are you converting yours to M030 as well?

Eric_Oz_S2

The FWSM specifies a different spring plate angle for the CSM030. The barrel helper springs are only around 80 lb/in (reportedly though perhaps up to 120 lb/in). Therefore with 750 lb on each wheel, and the additional lever arm of the rear suspension equating these to about 50 lb/in effective. The stock t bars are about 140 lb/in, so the difference oin height = (750/140 - 750/190) = 1.4"/35mm assuming even compression between tbar and coil. Now these springs are variable rate, so it is possible they are set to just be in compression when unloaded and therefore the numbers will be slightly lower. Although the spring plate angle is different, it is not sufficient to reduce the ride height by the 35mm + 20mm = 55mm lower (say 40mm taking into account variable rate) with helper springs. So my thoughts would be they are indexed differently between standard and M030.

RajDatta

From what I remember, installing rear helper spring M030 968 shocks will increase the height of the car. You will need to drop the TBC to reindex. It's a one time thing. What I have done in the past is let the TBC sit flat with the spring plates. Remove one spring plate, turn it 1 notch up and do the same for the other side. Worked like a charm. No math required .

PorscheG96

I dunno Raj, according the Clark's garage if you adjust the spring plate counter-clockwise by 1 position of the outer torsion bar splines then it'll lower the car by 2.35" - that's a lot!

http://www.clarks-garage.com/pdf-manual/susp-06.pdf

Eric_Oz_S2

One outer turn is about 65mm. One inner is about 6mm less. Therefore turn the outer 1 notch lower, and the inner one higher and you get about 6mm difference. I did the one outer turn which worked out OK for me, but I installed 250 lb/in helpers. Net result was about 20-30mm lower than stock. For M030 helpers you will need to calculate.

RajDatta

Hey, worked for me. I got perfect height from that. Could be, I did the inner, but I did it back about 6 yrs ago and it worked like a charm.

ckkrause

Found the link I was looking for... So, although Clark's is good for the reindexing proceedure, the quick way to get the torsion bars out is this method:

http://www.elephantracing.com/projec...ngplatediy.htm.

-Chuck

blue44

Colin, I hope you will follow up with a comprehensive post about your conversion, I'm thinking a similar upgrade might be in #53's future...

Donn

potent951turbo

I plan to. I won't be done getting all the parts together for another month or two but it shouldn't be too long from now.

PorscheG96

I just completed the m030 rear shock/spring install tonight:

Rear ride height before [measured from ground to top of wheel well] was 24-7/8"
Rear ride height after [same measurement and after 100 mile drive allowing to settle] is 26-1/4"

So for my car the rear suspension was raised 1-3/8" which is A LOT! Increasing the ride height took out the negative camber too - looks like slightly positive camber now. Not to worry though, Elephant Racing is going to get my entire rear suspension to rebuild/restore in January so they can reindex the torsion bars at that time.

BTW, my review of 968 m030 rear shock/spring combo is very simple: they are HOT ****. There's no better upgrade for a stock 968 whatsoever than installing just these rear shocks and springs, IMO. They beat m030 sway bars. They beat Koni Yellows. They beat DME chips, lowering springs, exhaust, etc etc etc. Trust me, I've had an original 968 m030 and the rear shocks get you most of the way there in terms of handling feel. Just awesome, I love driving my 968 again.

And I have a set of 5k miles stock rear shocks for sale - make offer!