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05-02-2019, 06:44 PM | #199 | |
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Have you thought of pairing the fronts or the whole kit with Eibach springs? That's how I had my E46 M3 and both my 330Ci's and they look great |
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05-02-2019, 06:49 PM | #200 |
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I compete in SCCA FStreet where that's not permitted. If I were to go to aftermarket springs, I look at that or a conversion with higher spring rates a slight drop. As I said, I'm less concerned about aesthetics as performance/function.
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05-02-2019, 08:01 PM | #201 | |
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When I put the B6 Damptronics, up front, I shortened the hats and swapped to Eibach Pro springs, as well...The combo of the B6 + Eibachs seems to work quite well...FWIW. -Mark in St. Louis ...posted before seeing the last 2 posts...Can you still shorten the hats? |
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05-02-2019, 08:19 PM | #202 |
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I can't legally shorten the strut hats. IMO -- even if I had shaved an 1/8-1/4", that's a marginal impact. I don't know how many folks have looked back at their car photos over the years but I have tonight. It's pretty clear the front OE struts really drop ride height over time as my photos show probably a 2.0-2.5" wheel gap (top of tire to edge of fender with understanding the wheel/tire would recede into the well upon compression) when I bought the car, and it sat about 1" lower as recently as a week ago. While that looks good, that suggests a serious loss of suspension travel up front which is no beauno.
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05-03-2019, 04:31 AM | #203 |
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Are you allowed to run camber plates? I think Ground Control do a reduced stack height version which is 11mm lower, this would potentially negate a lot of the lift from the dampers.
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05-03-2019, 12:35 PM | #204 |
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No we can't.
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05-03-2019, 03:14 PM | #205 |
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Have we ever confirmed where the ZCP drop comes from - springs, shocks, etc? I think they all have different PNs and I've read about ZCP spring drops, and that the shocks have lower perches. I ask because I am wondering how the Billys would mate up on a ZCP car in terms of height and spring match.
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05-03-2019, 11:10 PM | #206 | |
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Quote:
https://www.m3post.com/forums/showthread.php?t=1481852
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Journal: Link E9x ZCP Suspension Info: Link Track Chat Discord: https://discord.gg/VsKbTyqBVj |
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05-05-2019, 07:45 PM | #207 |
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Well, here's my updated assessment from today's Indy SCCA region autocross. I was .35 off of class winner, and probably around 10th out of 120 on index. While the front Bilstein B6 EDC damptronic units are very good for the street, you really need to use them with lowering springs at least up front or the rake of the car is thrown off a bit causing the car to have more grip in the rear than front. if you are limited to OEM SCP springs which I am to be class legal, the car doesn't quite want to take a set at corner entry. For street or track purposes, I'd love them but my gig is SCCA National autocross competition where .3 to .5 can be make a huge difference. More importantly, I don't want to have lingering doubts that this may be the difference that makes the difference. So I am going to keep the rear B6 EDC units and match them with OE ZCP EDC struts. If anyone has any interest on the fronts, they have 400 miles and a few days of wear and would do a killer deal for anyone wanting to make or complete a set.
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05-05-2019, 11:00 PM | #208 |
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300psi is not needed for cavitation. I ran my Motons at 150 and the WRS Bilsteins at 175-200. It's too bad they don't have schrader valves. You could probably get some installed by someone who knows what they're doing, but that means pulling everything off again.
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05-06-2019, 07:09 PM | #209 |
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For anyone interested, this is the FS ad for the struts. There is a great of interest.
https://www.m3post.com/forums/showthread.php?t=1611379 These have now been sold.
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05-11-2019, 10:12 AM | #210 |
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One point of observation as I just installed brand spanking new ZCP front EDC struts about an hour ago and am sending the Bilstein fronts out the buyer. While I did not take precise measurements, I can state without hesitation new to new, the Bilsteins and the OE ZCP units are at very, very close to the same ride height with ZCP springs used with both. I've got pictures which need to be resized to post here for the Bilsteins as the buyer wanted to see it prior to purchase, and can snap a picture of the now OEM struts but it may be a few days to get the pics re-sized to post here. So the moral of the story is the guy from Bilstein was dead on about the perceived raise of the Bilsteins being attributable to the OEM struts depressurizing over time.
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05-11-2019, 10:20 AM | #211 | |
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05-12-2019, 06:37 PM | #212 | |
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05-18-2019, 02:59 PM | #213 |
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I can't say as my car is ZCP EDC so I have no point of comparison.
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05-20-2019, 09:37 AM | #214 |
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Is anyone aware of damping differences between OEM/Sachs and the Bilsteins? Hopeful some excellent person out there has gone through the trouble to slap each on a dyno and run some charts.
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06-04-2019, 09:45 AM | #215 | |
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The fronts do and will raise the car. Not sure if you know, Bilstein motorsport can revalve the front shocks for you and internally adjust it (shorten the shaft). But you will have to send it to CA (in order to run in F Stock, they will be revalved to spec too, they had suggested digressive valving). I didnt care and kept it stock. I have it matched to ZCP EDC setting so the sport is not linear and love the suspension. The OEM rear shocks were trash when I pulled it out around 60K miles (when compressed, wouldnt even pop up while in hand), way too underdamped and the car would dance at high speed sweepers (Summit Point). With the Bilsteins, its noticable (even on the streets). I do miss the light weight shocks (OEM) but apart from that, love the Bilsteins. Lutfy |
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06-04-2019, 11:06 AM | #216 |
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So these Billies on a ZCP car, retaining ZCP springs, would end up at the same height as a stock ZCP car, will retain suspension travel/geometry as a stock ZCP car, and will retain the ZCP functionality (EDC modes)?
That'd be awesome to have such a good drop-in replacement alternative for the ZCP cars as well. I wonder what the weight difference is between the OE alum bodies and the Billy steels. Last edited by wyatth; 06-04-2019 at 11:24 AM.. |
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06-06-2019, 07:38 AM | #217 | |
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ZCP EDC modes will be fully functional. Unsure about the weight but its noticeable when you hold each (Sachs aluminum body vs Bilstein steel body) side by side. Lutfy |
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06-06-2019, 09:29 AM | #218 |
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Hm, above Z3papa says ride height is unchanged with ZCP springs, after adjusting for worn out sagging OE hardware.
ZCP springs and Eibach have a similar drop, so maybe you’re right about raising non-ZCP cars. |
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06-22-2019, 08:13 PM | #219 |
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I've read through this entire thread and its left me with the desire to try these B6 parts.
My car is a 2011 E92 ZCP. It currently sits at just over 21k miles, so the dampers may be loosening from sitting as opposed to wear (the car moved about 70 miles in the 12 months before I bought it). The car is beginning to get a little squirmy at the rear to match the tension rod looseness up front which will be serviced shortly. I figure I'd go with the Bilsteins and see how things tighten up before I start chasing bushings. This car will never see the track, and its strictly a weekend ride. I already have Dinan springs plus the Supplemental Ride Kit (Dinan Stage 2 suspension), courtesy of the original owner. I've noticed that there isn't much difference between the first two positions on the EDC, but the third one seems a bit choppy on the highway, which gives me another reason to think the stock dampers are sagging. I would think the Dinan springs are comparable to the Eibachs as far as drop and spring specs, so the B6 package would be right for my car. I'd also get GC camber plates since some people in this thread said they allow extra travel due to plate thickness. I'd have everything taken apart anyway, so I might as well go for it. If anyone can offer opinions about how this plan will work out, or what changes I should make, I'd like to hear it. |
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06-24-2019, 04:33 PM | #220 |
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Interesting, 21K on the shocks is not much at all and I can't imagine they wear so much just sitting there. Also surprised your PO put Dinan springs on a ZCP car - that's known to drop the car like, a few MMs at most. Eibach, ZCP, and Dinan springs are all quite close in rates/height.
FWIW you have Dinan Stage 1 suspension. Stage 2 adds the sway bar, 3 adds the camber plates (or vise versa). |
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