I'm sure Randy will elaborate, but off the top of my head, I would think that a thicker strut will be stronger and less-prone to deflection. On the down side, I think a larger-diameter strut will exhibit more "stiction", all else being equal (seal material, strut finish/coatings, etcetera).

 

Does more stiction equates to more noise over time?

Also, i heard that these designs would require overhaul every year so? Correct me if I am wrong

 

No, "stiction" has very little to do with noise. Stiction has to do with the difference between a material's static coefficient of friction and its dynamic coefficient of friction.

I know that sounds complicated, but think of it like this - when you're trying to push a wooden crate across the floor, it takes more force to *get* it moving than it does to *keep* it moving. The higher inital force is because the coefficient of static friction between the crate and the floor is always higher than the coefficient of dynamic friction between the two surfaces.

With a shock absorber at rest, there's a certain amount of force required to "unstick" the surfaces and get them sliding against one another. That's the property of a shock absorber that's commonly called "stiction", and less is better.

Large-diameter struts don't necessarily have more stiction, but it can happen. The coating on the strut surface (if any) has more of an effect than the diameter. That's why the super-expensive racing Ohlins shocks have coatings of titanium nitride or other similar hard/smooth compositions.

 

Ok, I need to know. Do these coilovers have replaceable cartriges. If yes, how much? If no, are they rebuildable? If rebuildable, by who and how much? If not rebuildable, can they be purchased from M7 one corner at a time? Or is there another option I am missing?

 

WOW this is an amazing set up. I want one, but dobt that I can afford it:(
Great job!!!

 

No answers???

 

I think most of the vendors, including M7, have been at AMVIV. It might be worth a phone call today to get the info.

 

I ordered these but still waiting for shipment. ( impulse buy) hope it's not a 2g$ mistake.

 

do we have the minimum and maximum lowering range on these coilovers?

i.e. what is the max height you can raise the car and what is the min height?

 

Still no answers? I'm disapointed!

 

If you want I will call M7 to get you your anwsers.

I now have these instock.

 

Just got these from M7 yesterday:



This is what they look like unpacked. Clearly the rears are not adjustable for ride separately from adjusting the spring compression, but the fronts are. I presume you fit the rears, then adjust the fronts to get the desired ride height balance between F and R. I am waiting on some Powerlinks before installing and an align/corner balance.

 

ride hight in the rear? Is that what you mean by rears not adjustable?

 

Dr.Phil - you going to ring these things out on the track and report back to us? Or are these for a street only application? Thanks!

mb

 

Doc, I pulled this from the M7 website: "The coilovers feature 15-position compression and rebound “click” adjustments, plus height adjustable settings." This seems to imply separate adjustments.

Not trying to doubt you, just trying to resolve your observation with the product description.

 

Well, looking at the rears, there's only one locking ring, so only one adjustment. This sets the "pre-load" on the spring, which will affect the ride height, but also the effective travel of the piston for a given load or impact. The fronts have two lockrings, and two adjustments: the height the piston sits in the housing, which will affect ride height, and the compression of the spring, which will affect travel.
So, as Randy from M7 has stated, the ride height is adjustable both front and rear, but not in the same way, and the rear ride height is adjusted at the expense of another (perhaps important) parameter.

mbcoops: I certainly anticipate taking these out to the track as soon as possible! But I was sent the "stock" springs, which are 240lbs front and 280lbs rear, I believe.

 

No problems: I just posted on the issue of ride height and piston travel, so that's one issue, but there's also "compression and rebound" which *is* separately adjustable via the knurled ***** at the bottom of the units (you may be able to see them on the fronts more clearly, they are about 5/8" diameter right at the bottom) But my understanding is that compression and rebound adjustment affects the rate at which the piston moves inside the chamber--what we would call damping. The spring, onthe other hand, determines other characteristics of the system, including ride height. My appraisal of the units is that ride height is adjusted differently (or at least can be done so) on the fronts as on the back units.

 

Thanks Doc!

 

DMH PWNZ TEH WORLD

 

As a CROSS dealer how could I not respond? There is no similarity between KTS and the JIC/CROSS. KTS is an entry level damper for kids looking to get into drifting with older Japanese cars. CROSS focuses on German cars – Porsche, BMW, MINI, Audi, and Volkswagen.

CROSS Competition coilovers feature:
--2 1/2" linear springs (rather than large barrel springs)
--integrated bump stops
--the ride height adjustability of both the front and rear is independent from the spring perch so adjusting ride height does not compromise the spring rate or rebound and compression of the damper
--front camber adjustable pillow ball upper mounts (which increases suspension travel)
--helper springs to aid in streetability of the coilovers
--a wide range of higher spring rates and for a smooth ride
--no additional charge for custom valving/spring rates

The spread of disinformation…
KTS:

 

As i said this is merely observation, no disinformation. everything you could ever want to know about the source of aftermarket components is freely available at

www.alibaba.com (one source)

all parts have to come from somewhere. most arent made in america due to our union structure and high wages.

 

And I was stating your observation was incorrect.

 

looking at these photos, and reading Don's specs for Cross, there's no connection between my M7 shocks and these products, other than the idea they may all perform a similar function, if not in a similar manner. Sorry.

 

here for over a month. And they have not answered my questions, which I think are questions most, if not all people are going to want to know before they pay hard earned bank for these. Because of this I have a wierd feeling that M7 has already dumped this product. I hope they will post here, answer my questions and prove me wrong. I think it's really sad that a company can't offer a set of coilovers with all the features of the Megans, that actually work (unlike the Megans), with some long term durability, at a good price. And when I say good price, I don't expect a company to give them away as I would gladly pay M7 $500 above their asking price for a set of coilovers with all of the aforementioned features. If a company would get serious and do this, they would corner the Mini coilover market and make a lot of money!

 

As others have mentioned we were busy with the AMVIV festivities as well as a soon to be released new product. Sorry we haven't had the time to post here as much as we could but we were busy shipping them As others have done give us a call and Peter can answer all your questions. The first 40 sets are gone but we should have more in a few weeks. As for " dumping " the product don't ever bet money on your weird feelings as you are going to go home broke The answer to all your questions can be found by calling 1- 562 -608-8123

Randy
M7 Tuning