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      09-14-2009, 12:29 AM   #23
psuwcc112
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Thanks for the finding, its quite useful..
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      09-14-2009, 02:18 AM   #24
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Quote:
Originally Posted by rldzhao View Post
So, I finally installed the Dinan Stage 1 kit today. I've only driven it on city streets so far, and it feels only slightly stiffer vs. OE. The drop is definitely noticeable but still practical for everyday driving.

I also had H&R on my red bull before, and I feel that Dinan is a much better balance between drop, comfort, and sportiness.

Now the interesting stuff...

Dinan's kit differentiates itself from other lowering springs because it has 1) shorter front guidesupport and 2) shorter bump stops, which effectively increases the suspension travel before hitting the bump stops.

So how did Dinan come up with these two parts? Turns out, right from BMW. See pictures for details.
Btw, is the guide support the same as the stock guide support with shave down rubber? Because, I notice the part number in your pic are different for the guide support..
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      09-14-2009, 02:27 AM   #25
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Quote:
Originally Posted by psuwcc112 View Post
Btw, is the guide support the same as the stock guide support with shave down rubber? Because, I notice the part number in your pic are different for the guide support..
Yeah- I noticed that too. I was thinking it's just L/R differences. B
And.. I couldn't find the part# in the Tischer's website (wanted to check the actual price).
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      09-14-2009, 05:21 AM   #26
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If you install the bumpstops, do you HAVE to shave the guide supports in the rear? What improvement will we feel doing this when paired with H&R or Eibach springs?
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      09-14-2009, 10:27 AM   #27
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Quote:
Originally Posted by MrHarris View Post
If you install the bumpstops, do you HAVE to shave the guide supports in the rear? What improvement will we feel doing this when paired with H&R or Eibach springs?
That's an interesting question. The photos in the original post are front suspension parts, not rear. I'm curious what Dinan did in the rear to increase travel.
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      09-14-2009, 11:30 AM   #28
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Quote:
Originally Posted by JAJ View Post
That's an interesting question. The photos in the original post are front suspension parts, not rear. I'm curious what Dinan did in the rear to increase travel.
I don't believe they did anything because there is supposed to be more travel in the rear, but I am just speculating.
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      09-14-2009, 04:07 PM   #29
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Quote:
Originally Posted by MrHarris View Post
If you install the bumpstops, do you HAVE to shave the guide supports in the rear? What improvement will we feel doing this when paired with H&R or Eibach springs?

You don't have to do anything with the rear, it already has enough travel. The modiified guide supports are only for the front.

disclaimer: I have been running the 99' bumpstops with H&R Sports and Dinan camber plates since the spring. The front end does still seem to bottom over long undulations on the highway, but understeer seems to be almost nil with 265's all the way around.
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      09-14-2009, 05:39 PM   #30
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I think I found the "Guide Support" on Tischer's web page. They call it the Strut Mount and the cost is $100.42 ea. I am not sure it's the same thing but it's an educated guess based on the picture shown in the link below (part number 16).

http://www.trademotion.com/partlocat...16&catalogid=1

This is timely because I just ordered RD Sport springs. I may try and mimick Dinan's system.
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      09-14-2009, 07:16 PM   #31
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Just to clear some things up for myself. These bump stops and shorter guide support or whatever, doesnt actually improve handling in any way. All it does is give the spring a little more room for comprssion so that it doesnt hit the bump stop correct?

If Im not mistaking, when i had my tire off, I can tell that inbetween the coil of the springs (the front) there was missing paint, as if when compressed too much the spring would actually hit one coil with another. Is this what would be resoluted with the new bump stops?
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      09-14-2009, 11:53 PM   #32
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Quote:
Originally Posted by JAJ View Post
When BMW lowered the M3 by 10mm (0.4") for Japan they changed the struts and the springs (but not the bumpstops or the guide support). Actually, until I read this thread, I thought that all Dinan had done was bring the Japanese market components to North America and match them up with their special springs.

Reducing the height of the bump stop risks damaging the valving inside the damper. I guess it doesn't happen, otherwise Dinan wouldn't do it.

If you tell REALOEM that you've got a European car, it will give you the part number for the Japanese struts.
1) European version has the same front struts as US version.
http://www.m3post.com/forums/showpos...3&postcount=19

2) The Japanese strut is definitely different vs US according to PN. But we do not know if the springs are different too because springs are option specific, so it is not listed on catalogues.

And we don't know how the Japanese strut is different, it could be just the geometry, where the spring mount is lowered, or it could be the damping rate, or it could be both and something else. The key is, we do not know based solely on PN.
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      09-14-2009, 11:59 PM   #33
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Quote:
Originally Posted by gthirtyfizle View Post
Just to clear some things up for myself. These bump stops and shorter guide support or whatever, doesnt actually improve handling in any way. All it does is give the spring a little more room for comprssion so that it doesnt hit the bump stop correct?

If Im not mistaking, when i had my tire off, I can tell that inbetween the coil of the springs (the front) there was missing paint, as if when compressed too much the spring would actually hit one coil with another. Is this what would be resoluted with the new bump stops?
I don't think there is enough suspension travel to compress the spring that much. If anything, having the H&R set up w/o modifiying anything else would create LESS travel vs. Dinan.
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      09-15-2009, 01:10 AM   #34
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So do we have to modify the guide supports if we change out the bump stops? I'm still confused if this will improve handling or not with H&R Sport springs.
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      09-15-2009, 06:52 AM   #35
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The Dinan spring, bumpstop, and guide supports are all engineered to work together. Just because these are existing parts doesn't mean that this solution isn't a good design. In fact I think it makes it even better since they are OEM proven parts. With that being said, without the Dinan spring with their specific rating then modifying the bumpstops and/or guide supports with H&R or other springs isn't going to do much for you IMO. Should give you more travel before you hit the bumpstop but it still isn't going to work the way the Dinan kit does because the H&R, etc. springs are shorter to begin with.
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      09-20-2009, 03:56 AM   #36
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Dinan did a great job in looking into this and developing a package to address the issues with lowering springs.
We have driven M3's with various lowering springs and there are issues.
I think it's great Dinan went to this length.

To some people their price will seem high, to others it won't as they will appreciate how much effort has gone into this.

As far as using OEM parts is concerned - Alpina do the same thing.
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      09-20-2009, 04:32 AM   #37
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So these other bumpstops won't help us guys w/ H&R?
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      09-23-2009, 12:34 AM   #38
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Quote:
Originally Posted by gthirtyfizle View Post
Just to clear some things up for myself. These bump stops and shorter guide support or whatever, doesnt actually improve handling in any way.
Running out of suspension travel causes the spring rate to rise suddenly, breaking tire traction. Longer travel improves handling by preventing this from happening.

If you really want to go fast, you need linear (not progressive) springs and enough suspension travel so they don't ever hit the bump stops. Slammed cars give up performance for looks, or else they ride like buckboards.
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      09-23-2009, 09:29 AM   #39
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damn... great find ! very very useful tip indeed!
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      09-23-2009, 10:48 AM   #40
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not surprising at all- That is all Dinan does- Dinan has been selling people renamed BMW OEM parts forever at a premium price-
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      09-23-2009, 02:11 PM   #41
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Quote:
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That'sAnd I don't think that that was done in an afternoon, sipping Jack Daniels and talking BS while looking at realoem.com.
haha ... but sometimes it feels like it ...


good info rldzhao
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      09-23-2009, 03:53 PM   #42
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not surprising at all- That is all Dinan does- Dinan has been selling people renamed BMW OEM parts forever at a premium price-
Yup they just pulled the stroker kits, exhaust, throttle bodies etc, right off the shelf no R&D whatsoever!

I don't own any Dinan stuff and may never - but R&D is something they do well and if there is something out there already made to achieve the desired result, why re-invent the wheel? Alot of tuners do this -nothing new.

OP- thanks for the info - very informative. I may actually purchase this kit now knowing what its made of.
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      09-29-2009, 05:38 PM   #43
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Thanks a lot for sharing this, rldzhao. I'm getting some H&R Sports installed tomorrow and I just now saw this thread.

Luckily, my parts guy is having them overnighted and I'll have them tomorrow morning in time for the install

Thanks again
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      09-29-2009, 06:43 PM   #44
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Quote:
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Thanks a lot for sharing this, rldzhao. I'm getting some H&R Sports installed tomorrow and I just now saw this thread.

Luckily, my parts guy is having them overnighted and I'll have them tomorrow morning in time for the install

Thanks again
did you order the bump stops and guide supports? please keep us posted on how it turns out for you. im thinking about trying this combo.
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