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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > AE /// AE Project 335 gets some new suspension! - JIC Cross Competition Coilovers



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      08-09-2009, 08:13 AM   #23
TSM330i
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Quote:
Originally Posted by Clap135 View Post
How much preload are you guys running with these? Do you experience any bottoming out? How bout clicking during HARD slalom transitions.

I just installed my JIC and at first the car woudl bottom out the suspension over pothole. Annoying, and sounded horrible. The preload was set so the the spring can be moved by hand but it required effort. The only way to get the car from nto bottoming out was to run the struts on full stiff, once again annoying. I upped the preload about half an inch, and now run setting 11 and no bottiming out, however now when i do hard slaloms the suspension in the front clicks as if the spring is rotating and not the pillow mount. So far, not to pleased with these coilovers. Any tips?
This sounds to me like you don't have everything tight. I've been running mine for over 1 year and never had any of the issues you're talking about. I'm also running 8 front and 7 in the rear.
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      08-09-2009, 09:29 AM   #24
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What is there to tighten? I have installed several coilover set ups.
You have the clamp bolt. check
You have the 3 top mount bolts. Check
You have the bracket for the sway bar/brake lines. Check
You have the two locking rings on the coilevers. Check

Its a pretty simple install


How much preload are you running?
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      08-10-2009, 06:31 PM   #25
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How do you know how much pre-load to set?
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      08-10-2009, 07:30 PM   #26
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you don't however the more preload you run the more compression stroke you get, but loose rebound stroke. Too much preload will over extend the schock and ruin them, probably ride horrible. Too little preload and you just lost compression stroke and are probably going to bottom out constantly. Everyone says leave preload alone, just make sure the spring is not vibrating up and down....snug is the word people like to use. I think preload make all the difference.
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      08-11-2009, 02:09 AM   #27
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So these are almost double adjustable equivelent coils???
This is more complicated than I thought they would be.
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      08-12-2009, 07:24 PM   #28
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Quote:
Originally Posted by AW325xi View Post
This sounds to me like you don't have everything tight. I've been running mine for over 1 year and never had any of the issues you're talking about. I'm also running 8 front and 7 in the rear.
Same. I've absolutely never had any issues with mine bottoming out or any noise after a few thousand miles. Handles amazing and I have nothing but great things to say.

The issues definitely sound like they could be installation related. There is a lot of stuff to check and double check when doing a coilover install.

Where is it bottoming out? Front or rear?
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      08-13-2009, 01:16 PM   #29
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how does the JIC Cross suspension stack up to the KW V3's?
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      08-13-2009, 06:05 PM   #30
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Quote:
Originally Posted by 94JZA80 View Post
how does the JIC Cross suspension stack up to the KW V3's?
In all honesty, I think it handles and rides better than the V3 equipped cars I have driven. I am really happy with the setup on my car. I did a canyon run up to the big bear area last night in it and it handled like it was on rails even on the stock swaybars.
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      08-13-2009, 07:28 PM   #31
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Quote:
Originally Posted by Nick@AEPerformance View Post
Same. I've absolutely never had any issues with mine bottoming out or any noise after a few thousand miles. Handles amazing and I have nothing but great things to say.

The issues definitely sound like they could be installation related. There is a lot of stuff to check and double check when doing a coilover install.

Where is it bottoming out? Front or rear?
It bottoms out over potholes where the stock suspension wouldnt.
Nothing is loose, its just a loud bang when the wheel bottoms out. It happens in the front. Nothing is installed wrong, the install like i said before is quite simple. Its a total of 5 bolts per side....preload help out alot, but other than that, the stock suspension simply has more travel then the jic coilovers. Or at least it seems that way.

Maybe you guys drive on glass roads. If you can take a picture of the front going over a pothole.
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      08-14-2009, 09:55 AM   #32
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I lived in NYC for 4 years and the pot holes therea are HUGE compared to the typical pot hole in Cali.
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      08-14-2009, 10:59 PM   #33
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This is true, however the stock suspension wouldnt bottom out over these holes. I drive the same route daily. Thats why i think the jic have less travel the stock, which is a shame
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      08-15-2009, 11:42 PM   #34
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Quote:
Originally Posted by Clap135 View Post
This is true, however the stock suspension wouldnt bottom out over these holes. I drive the same route daily. Thats why i think the jic have less travel the stock, which is a shame
Just curious, have you used coilovers before?
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      08-16-2009, 09:53 AM   #35
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I have used coilovers on several different cars. My autox toy had custom valved koni's with custom rate gc coilovers. This is not user error.

if possible, i would like to see an incar video of someone hitting a pothole at 40 or so. Doesnt even have to be pothole, even a 1 inch tall transition from pavement to concrete will do the trick. My car makes a loud thud that goes through the entire car....this is the suspension bottoming out. There is nothing that could be done about this aside from increased travel....which is simply not there.
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      08-25-2009, 05:37 PM   #36
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Quote:
Originally Posted by Clap135 View Post
I have used coilovers on several different cars. My autox toy had custom valved koni's with custom rate gc coilovers. This is not user error.

if possible, i would like to see an incar video of someone hitting a pothole at 40 or so. Doesnt even have to be pothole, even a 1 inch tall transition from pavement to concrete will do the trick. My car makes a loud thud that goes through the entire car....this is the suspension bottoming out. There is nothing that could be done about this aside from increased travel....which is simply not there.
Thats a bit strange... I run the same coilovers as you and I've never bottomed them out once whether it was potholes, road transitions, big compressions from a sudden elevation drop to a rise, on the track, and anywhere... Being this the case, since its the same kit... I can only deduce that it's something with the installation. I'd recommend contacting JIC or the dealer you purchased from to see what they say.
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      10-15-2009, 06:59 PM   #37
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I've now had this setup for ~4 months. My lasting impressions of the JIC Cross suspension is still great. The ride quality at 9/15 front and 11/15 rear is outstanding. The car stays very flat in the corners and remains very controllable from the drastic reduction in bodyroll.

Long road trips are comfortable and not jarring by any means. The suspension is firm but very forgiving over bumps and cracks in the road. No pogoing here!

Let us know if you have any questions about these coilovers, we have them in stock!

Nick
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      10-16-2009, 08:27 AM   #38
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^^^ I agree completely. I have mine on for over 1 year and they just inspire confidence in corners. Even large mid-corner bumps do not affect the car. The suspension just rides over them, reacts so quickly, never skates or steps sideways - it just stays hooked into the pavement.
I'm loving this set-up more and more.

Do you have any track days on them yet?
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      10-19-2009, 06:44 PM   #39
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Quote:
Originally Posted by AW325xi View Post
^^^ I agree completely. I have mine on for over 1 year and they just inspire confidence in corners. Even large mid-corner bumps do not affect the car. The suspension just rides over them, reacts so quickly, never skates or steps sideways - it just stays hooked into the pavement.
I'm loving this set-up more and more.

Do you have any track days on them yet?
100% Agreed. I have a few track days on them now and I have 0 Complaints. They keep the car so predictable its amazing.
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      10-19-2009, 08:20 PM   #40
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nice!
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      11-18-2009, 07:36 PM   #41
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nice!
thanks!
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      06-30-2010, 04:02 PM   #42
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For a new update on the JIC CO's-

After nearly a year of these is great! They drive smoothly and makes the car corner awesome! I have used these on tracks as well. I can definately answer any questions you have.

Nick
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      06-30-2010, 09:48 PM   #43
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I have a set of these waiting to go on so I might be contacting you with lots of questions. Any tips on how I should set these up?

They are used so the previous guy set them up and liked them but his wife didnt so they are in my living room with m3 bushings.
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      07-01-2010, 08:10 PM   #44
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Originally Posted by onefastman View Post
I have a set of these waiting to go on so I might be contacting you with lots of questions. Any tips on how I should set these up?

They are used so the previous guy set them up and liked them but his wife didnt so they are in my living room with m3 bushings.
We can definitely get you pointed the right way to do this. Give us a call and we'll help you.

Best Regards,

Nick
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