JRZ RS1 Information

[HP Autosport]

JRZ Suspension Engineering is proud to introduce the JRZ RS1 for your BMW e82 1m, a revolutionary development in multipurpose high performance damping.

Applying our race winning technology, JRZ designed the JRZ RS1 to give ultimate comfort for public roads and precise chassis control when driving on track.

The JRZ RS1 is a high gas pressure, single adjustable monotube damper. The canister has been designed inside of the damper.

JRZ inner canister technology gives the advantages of monotube canister dampers without the mounting concerns and complexity.

Easy to install, the JRZ RS1 is available as a complete kit with mounting hardware and springs for all applications we support.

Built on the same production line and sharing components with our pro racing applications, the JRZ RS1 is of true professional heritage.

Following JRZ’s design philosophy, the JRZ RS1 has a large 22mm diameter piston rod in strut applications and a 16mm diameter piston rod in aluminium damper applications.

The large piston rod magnifies the high pressure gas charge which means great chassis control without using a high spring rate or increasing harshness.

Utilizing a mono tube design with a high flow piston ensures the smoothest possible ride in normal conditions while the bleed adjustment gives the ability to tune for racing situations.

Unlike many other single adjustable suspensions, damping balance is carefully maintained between compression and rebound. This damping balance is critical to maintaining tire contact with the road in addition to controlling the main mass of the vehicle.

To satisfy the diverse needs of each driver’s application, the JRZ RS1 has an extra large adjustment range.

With a few clicks you can turn your smooth street car into a crisp, rock solid track car in seconds.

Features

• 22 mm rod strut, 16 mm rod damper
• 24 clicks of rebound
• Adjustable gas pressure, mono tube
• Piston designed for high performance
• Large adjustment range


JRZ has designed the JRZ RS1 to give the end user the best possible damper to drive daily, while maintaining the racetrack performance that wins championships.

The JRZ RS1 is shipped as a bolt-on kit and always comes with the personal support JRZ is known for.

Using the best materials, coatings and aerospace standard manufacturing processes as in our motorsport line; the JRZ RS1 is designed to perform flawlessly.

Adjustment is easy to perform and comes with the knowledge base only JRZ provides to his customers.

Benefits

• Easy to use and bolt-in
• Street ride, racing performance
• Extra long product life
• One adjustment for complete control of ride and handling
• Professional racing quality

Recommended applications

• Daily driving
• Drivers education (DE) events and track days
• Club racing


Both fixed height or height adjustable systems are available for your E82 1m. You can also purchase dampers only to fit your own springs.

[HP Autosport]

New reinforced anti roll bar mounts on the latest shipment from JRZ!

[kaiv]

Do you have wheel clearance info for the E9x m3 application? I'm running 10.5" ET20 up front and the rim clears the stock strut by a couple millimeters. I'm looking for an aftermarket coilover that'll also clear without spacers.

[HP Autosport]

Originally Posted by kaiv

Do you have wheel clearance info for the E9x m3 application? I'm running 10.5" ET20 up front and the rim clears the stock strut by a couple millimeters. I'm looking for an aftermarket coilover that'll also clear without spacers.

The JRZ RS1's don't take up any more room than the stock struts if I remember correctly. How are your tire to strut clearance? I can measure the OE strut vs the RS1 tomorrow and let you know my findings.

We can also custom tailor the RS1 so the lower spring perch is as high and away from the tire/wheel as possible.

[M3SQRD]

The location of the lower spring mount/collar sits up higher on the RS1 (damper body isn't as short as some other aftermarket dampers). I had clearance issues with my old damper setup but I'd have no problem now running a 10"et25 with a 275 tire - I can measure my current gap with a 9.5et23 but it's significant!

@kaiv - the delta backspacing between your 10.5et20 and a 10et25 is ~0.05", and between my 9.5et23 is ~0.38". There's ~0.5" of clearance but I can easily verify...

[HP Autosport]

Originally Posted by kaiv

Do you have wheel clearance info for the E9x m3 application? I'm running 10.5" ET20 up front and the rim clears the stock strut by a couple millimeters. I'm looking for an aftermarket coilover that'll also clear without spacers.

Update:

The RS1 is ~5mm smaller in overall diameter so that equals to more room for the wheel/tire.

Originally Posted by M3SQRD

The location of the lower spring mount/collar sits up higher on the RS1 (damper body isn't as short as some other aftermarket dampers). I had clearance issues with my old damper setup but I'd have no problem now running a 10"et25 with a 275 tire - I can measure my current gap with a 9.5et23 but it's significant!

@kaiv - the delta backspacing between your 10.5et20 and a 10et25 is ~0.05", and between my 9.5et23 is ~0.38". There's ~0.5" of clearance but I can easily verify...

JRZ also offers the RS1 as a fix height system so the overall dimensions of the front strut is kept as close to OE as possible.

If a longer static height spring is used there still can be wheel/tire clearance issues with the collar/lower spring perch.

[kaiv]

This is great news. Thanks for the info.
I would love to have a little bit more room to run 285s on my 10.5 ET20 without spacers. The 275s I currently run are a little stretched -_-

[HP Autosport]

Originally Posted by kaiv

This is great news. Thanks for the info.
I would love to have a little bit more room to run 285s on my 10.5 ET20 without spacers. The 275s I currently run are a little stretched -_-

We are talking about ~2.5mm more room so make sure that is enough before getting fatter rubber!

[M3SQRD]

Originally Posted by kaiv

This is great news. Thanks for the info.
I would love to have a little bit more room to run 285s on my 10.5 ET20 without spacers. The 275s I currently run are a little stretched -_-

Finally had time to measure the min clearance which is between the tire sidewall and the lower spring mount/collar. With a 265 mm tire on an 18x9.5et23 wheel the min clearance is 0.35" - hope this helps!

[kaiv]

Originally Posted by M3SQRD

Finally had time to measure the min clearance which is between the tire sidewall and the lower spring mount/collar. With a 265 mm tire on an 18x9.5et23 wheel the min clearance is 0.35" - hope this helps!

Thank you! It does help!

Now am I confused though, given that your finding tell a different story that HP autowerks.

If .35" = 8.9 mm that would mean I wouldn't even be able to bolt my wheels on (without spacers) given that my 10.5 ET20 has 10mm less inner clearance than your 9.5 ET23

[HP Autosport]

Originally Posted by M3SQRD

Finally had time to measure the min clearance which is between the tire sidewall and the lower spring mount/collar. With a 265 mm tire on an 18x9.5et23 wheel the min clearance is 0.35" - hope this helps!

What about the clearance between the wheel/tire to the strut housing itself?

[M3SQRD]

Originally Posted by HP Autowerks

What about the clearance between the wheel/tire to the strut housing itself?

I measured the minimum clearance which in my case was the tire sidewall to the lower spring mount. No point in measuring to the damper body because I'd have an interference.

[HP Autosport]

Originally Posted by kaiv

Thank you! It does help!

Now am I confused though, given that your finding tell a different story that HP autowerks.

If .35" = 8.9 mm that would mean I wouldn't even be able to bolt my wheels on (without spacers) given that my 10.5 ET20 has 10mm less inner clearance than your 9.5 ET23

"M3SQRD" has a different clearance issues(wheel/tire to spring perch). As I have stated in a previous post that custom spring length will avoid this potential issue and give you a lot more wheel/tire to strut clearance.

[kaiv]

M3SQRD, what type/length springs are you using?

Also -and if it's not too much trouble- could you measure how much shorter the spring would have to be /how much higher the perch would have to sit to have full rim/tire clearance?

[HP Autosport]

Originally Posted by kaiv

M3SQRD, what type/length springs are you using?

Also -and if it's not too much trouble- could you measure how much shorter the spring would have to be /how much higher the perch would have to sit to have full rim/tire clearance?

1" shorter main spring(6") will take care of the issue.

[M3SQRD]

Originally Posted by kaiv

M3SQRD, what type/length springs are you using?

Also -and if it's not too much trouble- could you measure how much shorter the spring would have to be /how much higher the perch would have to sit to have full rim/tire clearance?

Sent you a PM...

[HP Autosport]

2011 BMW 1M(shares most of the suspension with the E9x M3)

JRZ RS1

Features

• 22 mm rod strut, 16 mm rod damper
• 24 clicks of rebound
• Adjustable gas pressure, mono tube
• Piston designed for high performance
• Large adjustment range

No other relevant suspension mods.

Installation is straight forward using OE upper mounts front(camber plates are optional) and rear. Spring rates used on the BMW 1M JRZ RS1's are Swift 336 lb/in (6kg) front and 672 lb/in (12kg) rear, more than doubling the front rate and with a 40% increase in rear rate. With some tweaks in rates this same system will work great on the E9x M3 as well. Helpers are used front to prevent the main springs from unloading and in the rear to allow quick change of the rear springs. Swift thrust sheets are also used to prevent spring rate spikes and to dampen any noise with the coilover springs. Harsh rides generally result from dampers that are not properly valved for the spring rates, but that is not the case with the RS1's, they are valved for a wide range of spring rates and are a perfect match for the rates above. The ride is comfortable, even more comfortable than OE. YES, you read it right! Yet, the entire suspension is well controlled and have much better performance than OE.

JRZ RS1 kept things simple for the users with one damper adjustment, offering just one-way, 24 clicks of damping force adjustments. For the spring rates above we settled on 6 clicks on the front and 5 clicks in the rear for street use. Going up to 10+ front and rear Dr. Jekyll instantly turns to Mr. Hyde, with confident inspiring turn-in at high speeds along with stiffer, but not harsh ride.

[M3SQRD]

Nice setup Harold

I'm running 400/672 and 500/800 rates with RS1 dampers on e92 M3s - 400/672 is a great street setup, and 500/800 is a great dual-purpose setup. Even with 500/800 rates the ride is not at all harsh on the street!

[Wendall]

What lengh springs would I need on front and rear for the JRZ RS1 with stock ZCP wheels. I want to keep a modest Eibach Pro Kit ride height.

[M3SQRD]

Originally Posted by biggynuts01

What lengh springs would I need on front and rear for the JRZ RS1 with stock ZCP wheels. I want to keep a modest Eibach Pro Kit ride height.

You didn't specify spring rates...

[Wendall]

Originally Posted by M3SQRD

You didn't specify spring rates...

im looking at 500/800

[HP Autosport]

Originally Posted by biggynuts01

What lengh springs would I need on front and rear for the JRZ RS1 with stock ZCP wheels. I want to keep a modest Eibach Pro Kit ride height.

We like to use a 6 to 7" front with helpers and a 8-9" rear with helpers.

Originally Posted by biggynuts01

im looking at 500/800

That is an excellent choice for the M3.