[OpenFlash]

Hi guys,
I know this isn't the suspension forum but a lot of you high-HP guys know how much work it is to get your cars to go where you point them sometimes. And with the 700+bhp single turbo, it's a bigger challenge. So we stepped up to the plate to develop a custom valved JRZ suspension package with the help of our old racer friend/chassis guy/racing hot shoe Paul Gerrard. We've been through many aftermarket suspension upgrades (full m3 link conversion, shocks, springs, sways, bushings, etc,.) and the balance of the car still isn't right once the throttle pedal goes down. The front end lifts up so much that the car just wants to understeer and then snap into oversteer. Fun yes, but not very well balanced. We are going to fix that. Check out these beauties:







More update to come soon...

Cheer,
shiv

[klipseracer]

Have you run these before or currently?

[E90Company]

cool

[onesuperboi]

Very interested.

Have you considered ASTs with swift springs? They seem to be popular with the trackers on this forum.

[OpenFlash]

Originally Posted by klipseracer

Have you run these before or currently?

I've run the "off-the-shelf" version of the RS1s on an FBO track car before and they were spectacular. In fact, that little experience is what opened our eyes to the JRZ setup in the first place. Just a few valving/spring rate changes is all that is needed to suit big power street cars. We did something similar years back for the Mitsu EVO using Ohlins and the results were great. The valving that we came up with is now standard from Ohlins

[Laguna Seca Blue]

Wow, very nice. I was just about to buy PSS10's! I need to speak to you before I do something stupid.

[BT#2]

I can't believe they use 8.8 bolts...
Post a photo of them after a year.
I don't want to think about how they would look after a winter in Sweden..

[OpenFlash]

Originally Posted by Laguna Seca Blue

Wow, very nice. I was just about to buy PSS10's! I need to speak to you before I do something stupid.

Lol I don't think the Bilsteins are stupid by any means. They are just in another category. JRZ is definitely in the upper end of the scale along with Moton, Penske and Ohlins. I don't have much experience with the AST products.

[farbmw]

Shiv, so to use these, should you upgrade the 335i with the M3 bits?

[badass335]

I'm all ready!! I already have the m3 bits plus Olhins and swift springs!!

[Syndicategt]

JRZ (and Moton) are in a whole other league. Nice coils

[Hisam135i]

Lol Vishnu is now in the process of completely dominating the n54 community! One stop shop for everything!

[OpenFlash]

Originally Posted by farbmw

Shiv, so to use these, should you upgrade the 335i with the M3 bits?

It will certainly help but by no means is it required. The subjective differences of running the JRZ shocks w/springs is an order of magnitude greater than what you would see with doing all the m3 links/bushings on an otherwise stock suspension. I suspect this is because much of the deflection in the stock suspension comes from the soft shock tops/mounts. And the damping curve on the shocks seem to have no sporting aspirations at all. I feel the m3 link/bushing upgrade is more of an icing on the cake kind of thing whereas the shocks/springs are the cake itself.

Shiv

[asian010]

omg jrzs....

[EastBayE90]

So badass. The difference is going to be like night and day.

[Jeef]

Pricing on these please?

[OpenFlash]

Originally Posted by Jeef

Pricing on these please?

The JRZ dampers themselves will be around $2500. At that point, you can do swift springs for a few hundred more. For a more race-oriented set up (as shown above), you are looking at Eibach linear rate springs, helper springs, camber plates, adjustable height perches, etc, which brings it up to approx $4500. Not cheap but they absolutely transform the car. Makes an m3 with quasi-upgraded suspension (KW, Bilstein, etc,.) feel unplanted and harsh by comparison.

Shiv

[Wedge1967]

Warm fuzzy feeling...

Nice stuff Shiv.

[Orb]

Nice setup although the springs look on the short side. The rear link bushings do not make a huge difference but new toe link certainly will. Good luck with the M3 rear sub frame bushing…ended up dumping the M3 ones for delrin bushing and that helped a great deal.

The rear dampener isolators can be fixed somewhat by using the M3 EDC ones which are shorter and stiffer but you need to make new spacers for them. It is a cheap solution without creating a ball joint. A ball joint for the dampener is not going to help as one would expect unless you run really high spring rates that require very stiff dampening. You can give it a try…I did.

The problem you will now run into with 60 mm race spring is stiffness spikes. A few observations you notice that the spring will compress along a curved axis with the spring seat faces varying up to 12 degrees. A spring compressed squarely is generally linear between 15-85% of its stroke. Compress a spring along a curved axis and it becomes very non linear indeed. The rate of change of the curved axis is what gets you and it induces an abrupt stiffness spikes. Honda has nice info in their patents about this but in generally relates to droop travel in their design which is yet even a bigger issue for stability. If you run into grip/spike problems PM for a solution. You are a smart so i expect you will piece it together.

BTW, the cake is the spring length an quality for sure....

Originally Posted by shiv@vishnu

It will certainly help but by no means is it required. The subjective differences of running the JRZ shocks w/springs is an order of magnitude greater than what you would see with doing all the m3 links/bushings on an otherwise stock suspension. I suspect this is because much of the deflection in the stock suspension comes from the soft shock tops/mounts. And the damping curve on the shocks seem to have no sporting aspirations at all. I feel the m3 link/bushing upgrade is more of an icing on the cake kind of thing whereas the shocks/springs are the cake itself.

Shiv

[farbmw]

Originally Posted by shiv@vishnu

It will certainly help but by no means is it required. The subjective differences of running the JRZ shocks w/springs is an order of magnitude greater than what you would see with doing all the m3 links/bushings on an otherwise stock suspension. I suspect this is because much of the deflection in the stock suspension comes from the soft shock tops/mounts. And the damping curve on the shocks seem to have no sporting aspirations at all. I feel the m3 link/bushing upgrade is more of an icing on the cake kind of thing whereas the shocks/springs are the cake itself.

Shiv

So if one has the the M3 rear Camber arms would you have a kit that would use it?

If so I would be in.

[OpenFlash]

Originally Posted by farbmw

So if one has the the M3 rear Camber arms would you have a kit that would use it?

If so I would be in.

If you have the M3 lower control arm, no problem. There is a different mount that can be fitted to be compatible with M cars. Pictured above is the non-M version of the kit.

Shiv

[farbmw]

Originally Posted by shiv@vishnu

If you have the M3 lower control arm, no problem. There is a different mount that can be fitted to be compatible with M cars. Pictured above is the non-M version of the kit.

Shiv

That is what I tought, but wanted to make sure.

Very nice I can't wait for this.