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-   -   Dinan Suspension Review (http://www.bimmerfest.com/forums/showthread.php?t=594471)

dunderhi 01-16-2012 10:25 AM

Dinan Suspension Review
 
1 Attachment(s)
Just a teaser for now. I just got my car back from the dealer and I will do a full write-up tonight.

Here's how she looks:
Attachment 308430

Stealth.Pilot 01-16-2012 10:46 AM

Awesome. You lucky guy.

Please can you comment on how the suspension affects these things:
1) Crispness of Turn-in response
2) General body roll
3) Stability in bus-stop chicane like maneuvers (when you make a quick right then left again move at speed as if driving through a bus stop or driving around an obstacle).
4) feeling of weight transfer when braking
5) Ride Quality
6) Is the ride height reduction in front and back identically the same or has the angle of the car changed slightly
7) Do you notice the car is lower when getting in and out

tadtaggert 01-16-2012 11:08 AM

Quote:

Originally Posted by Stealth.Pilot (Post 6565715)
1) Crispness of Turn-in response

Some more detail here if you can:

1: at different speeds
2: does it change turning point (are you finding early apex compared to how you turn)
3: does it change exit (are you better able to handle late apex)
4: if you can find a good place, how does it change back to back or complex curves

Very jealous, have some fun getting some answers.

Calgary Agent 01-16-2012 11:27 AM

What did your dealer charge you for install (which apparently took more time than they'd estimated)?

Munich77 01-16-2012 12:35 PM

That looks nice... looking forward to your reading your review.

sdg1871 01-16-2012 05:15 PM

Congrats!! Use it well

wdimagineer 01-16-2012 05:19 PM

Looks great! Can't wait to hear your thoughts and curious to know how much BMWSS charged.

My new 550xi should be sitting in that exact spot in a few weeks. :)

Needsdecaf 01-16-2012 05:39 PM

Aaaaaand? :D

dunderhi 01-16-2012 07:04 PM

1 Attachment(s)
Thanks for the comments so far...;)

Attachment 308539

Okay, before I get into my review I need to supply some background:

My car is not stock!

1) I swapped out my 19" MSport 351M wheels and Goodyear LS tires for 19" BBS RGR wheels and Michelin Pilot Super Sport non-RFT tires.

What did this do? It trimmed 71lbs of unsprung weight, improved my grip, improved my road feel, lightened the my steering, and softened the ride. This was a significant improvement in the overall handling nature of the car.

2) I added Dinan S1 and then S2 software

What did this do? It knocked my 0-60 down to 4 seconds and my quarter mile down to 12.5 seconds. But there was a downside, my car would suffer from significant squat during hard acceleration, which if in a turn (like pulling into traffic) meant I had to actively manage my power to control the understeer.

3) I swapped out my Summer wheels for even lighter Winter wheels.

What did this do? It help me draw a much needed conclusion, the stiffer Winter tires firmed up the ride a bit, but it really isolated the softness of the springs when under full power, so I needed new springs.




So why am I sharing all of this history, which is already known my many here at Bimmerfest? Because these mods exist working together on my car and I cannot predict how this set of springs will feel on a car with a different set-up.

So first I will start with Mrs Dunderhi's comments:

1) Well that was undramatic!

This occurred just after I told her to brace herself right before I did a high speed emergency lane change maneuver.

2) I'm not sure what's it's going to take to brake the back end loose.

This was said after exiting a section of very sharp twisties (15 mph bends at ~45mph)

3) I'm going to need more places to hold on to!

This was said while on my favorite road with a number of sweeping bends and a chicane or two. Yes, we took the long way home tonight.


Hmm, need I say anything more? I think Mrs. Dunderhi has said it all. :D



Okay, maybe some qualitative observations. As side note, my car is equipped with DDC and ARS.

Dive - Reduced in all modes, but to be honest I really didn't make a big effort to get a feel for dive this evening.
Squat - One of my biggest annoyances after getting Dinan software. The back-end hunkered down and the front end lifted up. It's still there to some extent in Comfort mode, but pretty much disappears by the time you get into Sport mode.
Roll - Decreased in all modes, Sport mode is incredibly flat in the turns.
Stability - Well, this means different things to different people, but I can say with confidence, I took some turns faster than I ever have and the car behaved as predicted.
Responsiveness - My lighter wheels really upped my steering responsiveness, but the new springs decreased the plow that I experienced in hard turns.
Emergency Maneuvers - (Professional driver on a closed course. Do not attempt.) ;) I did do some sharp S-turns (think slalom testing) at highway speeds and this is one place the car's mass cannot be overcome and the momentum of the rear end of the car could be felt lagging behind the maneuvers. It was still under control and surpassed the previous setup.
Turning - Since there are several turning questions, I did take on a couple clover leafs at speed, and the level of control is much improved, to the point I felt comfortable accelerating while in the cloverleaf.
Ride Height Reduction - I can't see it or feel it. The gaps in the wheel arches are about two fingers.
Compliance - I lost a good bit of pothole absorption capability, so my car feels more like it did when is was equipped with RFTs.




So how does this affect the driving modes of the car?

I originally had five modes for my suspension:

1) DSC Inactive (Pogo stick mode) - Absolutely horrible! Each corner of the car moved independently in the vertical plane.
2) Comfort (Lincoln mode) - Unacceptable! The front and the back of the car moved independently in the vertical plane.
3) Normal (Large Sedan mode) - Acceptable for cruising. The car was okay under non-performance circumstances.
4) Sport (My Normal mode) - Good for a sport sedan. Has what it takes, unless pushing it hard under full power.
5) Sport+ (Hold on mode) - Good for relieving stress. Didn't seem to make anything much better, just faster!


I now have five new modes for my suspension:

3.5) DSC Inactive (Old Normal mode) - Wow! If this was to only mode, I'd think most people would be okay with it. Some lean in the turns, but not that bad for normal use.
4) Comfort (Old Sport Mode) - Double Wow! This feels like a sport sedan! It doesn't cushion the blow as well, but it's no longer a Buick!
5) Normal (New Sport mode) - Just how I like it - most of the time. This might be my new default for the commute.
5+) Sport (Super Sport mode) - Just how I like it when I want to make the tires sing and that's what they did on tight cloverleaf today.
5++) Sport+ (I'm must be afraid to try it mode) - I didn't even think to try this evening, the other modes had what I was looking for.

My perceived differences between the modes are much smaller now, hence my numbering scheme.




On the negative side, I think I have paid the most for labor thus far @1,250 + $180 for an alignment, so maybe I'll buy one less $400 flashlight or something like that. Also, unlike what my pseudo SA originally claimed, BMWSS doesn't offer a BMWCCA discount on non-BMW parts. At least when I would take my Benz's in for service next door, they would say it was $500 or something like that and then take 10% off to make me feel good about them fleecing me. :rolleyes:

Finally, in my opinion, if you get Dinan or any other performance software for your 550, you should really consider having a firmer suspension setup to deal with the additional power. Tell your wives it's a safety issue. :thumbup:


P.S. I hit a thousand words in a single post! I must really like these springs. :roundel:

Sophisto 01-16-2012 07:04 PM

Nice!

dunderhi 01-16-2012 07:07 PM

Quote:

Originally Posted by Sophisto (Post 6566994)
Nice!

Nah, I just write slowly. :typing:

Thanks for the concern. ;)


HEY! No backsies :rofl:

Capobranco 01-16-2012 08:41 PM

Congrats

- a great deal of effort with a good result - a very cool F10 :cool:

(hope you show it at Bimmerfest East again ....or perhaps at Cars and Coffee sooner....)

JRDM 01-16-2012 08:51 PM

Nice write-up. Great info

Needsdecaf 01-17-2012 07:13 AM

Hmmm, I'm a bit nervous about the pothole absorbtion capability. When are you taking the ride down to NoVA? :o)

Stealth.Pilot 01-17-2012 08:48 AM

Quote:

Originally Posted by Needsdecaf (Post 6567694)
Hmmm, I'm a bit nervous about the pothole absorbtion capability. When are you taking the ride down to NoVA? :o)

Me too.

This is why I was hoping someone would reprogram the suspension rather than just changing the springs. I would like a better sport plus mode, but not at the expense of the comfort+ mode (which I find useful on some really bad roads).

Susoa 01-18-2012 04:55 PM

Now that you got yours done I can make up my mind. Did you go to Tisher and would you recommend them?

dunderhi 01-18-2012 07:45 PM

Quote:

Originally Posted by Susoa (Post 6571638)
Now that you got yours done I can make up my mind. Did you go to Tisher and would you recommend them?

Tischer does good work, but they appear to be expensive relative to what everyone else has said. If I had to do it again, I would get a couple of labor quotes first.

BTW, after couple more drives, both spirited and not, I would say I am happy with this mod. The roads around here are fairly smooth, so the only test I haven't done yet is a drive down to DC. :eeps:

wdimagineer 01-18-2012 09:26 PM

Wanna take a spin in to Georgetown for me? :)

I ordered the suspension and exhaust today. Can't be any worse than my M3 when it comes to navigating the hazard that is DC.

Susoa 01-19-2012 07:31 AM

Quote:

Originally Posted by wdimagineer (Post 6572245)
Wanna take a spin in to Georgetown for me? :)

I ordered the suspension and exhaust today. Can't be any worse than my M3 when it comes to navigating the hazard that is DC.

Who'd you go with? Also, is an alignment necessary?

wdimagineer 01-19-2012 07:37 AM

I haven't picked a shop yet to do the labor. Alignment probably isn't necessary but I'd have one performed regardless.

scuzzlebutt 01-19-2012 08:17 AM

Quote:

Originally Posted by wdimagineer (Post 6572245)
Wanna take a spin in to Georgetown for me? :)

I ordered the suspension and exhaust today. Can't be any worse than my M3 when it comes to navigating the hazard that is DC.

Mind me asking what the price was? I noticed the website pricing is lower today. Do they discount as a package deal if you combine?

Needsdecaf 01-19-2012 10:59 AM

Quote:

Originally Posted by wdimagineer (Post 6572788)
I haven't picked a shop yet to do the labor. Alignment probably isn't necessary but I'd have one performed regardless.

http://www.fairfaxservicecenter.com/

These guys are right up the street from my office. In fact ,they are about 1/2 block away from BMW FFX, lol.

They are a Dinan installer, and likely to be cheaper than a main dealer.

There is a guy with an E38 "Dinan" 7 that I see on the way to work in the morning a lot who parks at this place.

Susoa 01-19-2012 05:14 PM

Did they lower the price, I can't remember?

dunderhi 01-19-2012 06:44 PM

I just sent a note to Dinan saying WTF? :dunno:

Needsdecaf 01-19-2012 06:53 PM

Quote:

Originally Posted by dunderhi (Post 6574290)
I just sent a note to Dinan saying WTF? :dunno:

Holy crap, did the price just HALF? Or am I misremembering? :p


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