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post #1 of 11 Old 7th May 2019, 09:09 PM Thread Starter
fsubzero
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Question on Dinan

I just pulled my 2001 M5 from storage. Had new battery, fluid changes, sway bar brackets, fluid changes and thrust bearings changed when pulled from storage. Friday just had my AS3 tires pulled and had Pilot Sport PS4 tires installed with everything aligned. Car is tight and engine buttery smooth and quiet. It’s got 44.5k and I really enjoy driving it.

Now my question. I see when EAG sells their cars, they either install Dinan upgrades or their customers ask for upgrades to be installed. I want to know, the benefits of doing Dinan upgrades and what will I give up over stock if I move forward. Will the car be brutal on Chicago area roads? I am not interested in discussion of shock brands, strategies, etc. It would be Dinan. I read many postings including Ryan Schultz from E39 source. Nor am I interested in impact of car value. After recent dealings, I have no interest in getting back into selling my car. I am a retired geezer that lives to drive through country and mountain twisties. I don’t drift or track the the car. It’s just that In looking at EAG Dinan package is on almost every car they sell. I figure I would need about 20 to 30k investment. Just don’t want spend the money and find I regret it (and don’t want end up pulling parts and selling)

Thanks.
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post #2 of 11 Old 7th May 2019, 10:31 PM
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Quote:
Originally Posted by fsubzero View Post
I just pulled my 2001 M5 from storage. Had new battery, fluid changes, sway bar brackets, fluid changes and thrust bearings changed when pulled from storage. Friday just had my AS3 tires pulled and had Pilot Sport PS4 tires installed with everything aligned. Car is tight and engine buttery smooth and quiet. Itís got 44.5k and I really enjoy driving it.

Now my question. I see when EAG sells their cars, they either install Dinan upgrades or their customers ask for upgrades to be installed. I want to know, the benefits of doing Dinan upgrades and what will I give up over stock if I move forward. Will the car be brutal on Chicago area roads? I am not interested in discussion of shock brands, strategies, etc. It would be Dinan. I read many postings including Ryan Schultz from E39 source. Nor am I interested in impact of car value. After recent dealings, I have no interest in getting back into selling my car. I am a retired geezer that lives to drive through country and mountain twisties. I donít drift or track the the car. Itís just that In looking at EAG Dinan package is on almost every car they sell. I figure I would need about 20 to 30k investment. Just donít want spend the money and find I regret it (and donít want end up pulling parts and selling)

Thanks.
As a long time E39 M5 owner, not sure you really need many Dinan upgrades.

The one place I think they did a better job than the factory was shocks and springs. They don't have their own shock. They went to Koni for that and supposedly gave Koni the specs they wanted. Their Koni setup is very comfortable on the street, yet not at all floaty. It can be used at the track, although the springs are a bit underdamped for that. But short of track work, it is a great setup. I don't know that it is even available anymore (they later went to adjustable JRZ shocks), but there is plenty of discussion here about Koni "yellows" being close. Their is also a discussion of their springs and spring rates and progressive vs. linear.

Rear wheels up front and an adjustable rear sway bar will certainly help handling with the wider wheels and tires a bigger help on the street. I also prefer X5 thrust bushings over Dinan monoballs for the street.

If the car is quick enough, what other items are you contemplating?

Regards,
Jerry

'01 Black/caramel
Dinan Stage 3 suspension, SS jet coated headers, ESS SC kit w/ 1 range colder NGK's, 92mm pulley, 440 Big Greens, TTFS alpha N tune for meth, RK plenum plates, SBC Endurance Stage 3 Kevlar performance clutch setup, "Jed" lightened DMFW, open brake ducts, TEC cupholder, U.S.(Euro style) tilt/slide armrest, 6k HID fogs, Umnitza bi-xenon flamethrowers w/6k super white low beams, rear fogs, V1/Stealth1, dual head LI, 2.65 diff w/40% lockup/2x dynamic, compact spare, Euro trailer hitch, Mocal oil cooler, ACS type rear spoiler, Rogue custom SSK and tranny mounts, ST 355 BBK (fronts), BP sway bar brackets, Bluetooth retrofit, Speedhut boost gauge (20 psi), Dinan TB's and VS, KB BAP, Howerton/HFS-3 Aquamist WI trunk setup (50/50), with 2nd gauge in rear view mirror, aftermarket trunk mounted sound system integrated into stock unit (amps and crossovers and sub and speakers).......
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post #3 of 11 Old 7th May 2019, 10:44 PM Thread Starter
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Thanks for your input. My car is fast enough, that said always looking at upgrades. The shock setup, throttle bodies, front strut bar, not sure what else. Maybe wheels if can find them and priced ok. Not too keen on exhaust, I don’t want loud

I was told one time the dinan lowers the car so I was worried about. Chicago streets.
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post #4 of 11 Old 8th May 2019, 02:07 AM Thread Starter
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Went back and confirmed the lower ride height with full Dinan. There is no right or wrong. I was curious because many of the EAG cars have Dinan upgrades. Thought there was some magic. Almost every road in my area is under construction so stiffer would be bad. The county roads in southeastern Wisconsin though- that’s where I spend a lot of my time. Going to stay with OEM for now and put the money elsewhere such as travel trips or PM in the car. Monarch Pass in Colorado 🙂. I am fanatical about maintaining my car mechanically.

Thanks for the response. I appreciate it.
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post #5 of 11 Old 8th May 2019, 09:15 AM
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I own a 2001 Dinan S1 with KW suspension. My friends have stock M5 and I also have a 2001 530 sport. If you had to do something, I’d stick with the strut bars (they really do eliminate cowl shake when going over potholes) and I highly recommend the exhaust. It’s not boomy and only slightly louder than stock. It’s never obnoxious
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post #6 of 11 Old 8th May 2019, 01:25 PM
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Quote:
Originally Posted by fsubzero View Post
Went back and confirmed the lower ride height with full Dinan. There is no right or wrong. I was curious because many of the EAG cars have Dinan upgrades. Thought there was some magic. Almost every road in my area is under construction so stiffer would be bad. The county roads in southeastern Wisconsin though- that’s where I spend a lot of my time. Going to stay with OEM for now and put the money elsewhere such as travel trips or PM in the car. Monarch Pass in Colorado 🙂. I am fanatical about maintaining my car mechanically.

Thanks for the response. I appreciate it.
I had the Dinan springs/shocks/rear sway bar/GC camber plates on my M5 for most of my 14+ year ownership. They are not *that* much different, from a ride perspective, than stock. Slightly firmer spring rates, and the rear springs are linear as opposed to progressive. Just last week I drove an M5 with stock springs, Konis, Dinan rear sway bar, rear wheels up front, and it felt almost identical to what I recall my car feeling like. Honestly, the spring change isn't worth it imo unless you want lowering.

The Dinan ride height spec was 14" +/- 0.25"'. Stock is about 14.5 up front and 14.25 in the rear. These are wheel hub centerline straight up to fender lip dimensions. I found the Dinan springs lowered the car a bit more than their spec by about 1/4-3/8", so you could end up close to 1" lower than stock. Unfortunately, this a significant percentage of bump (compression) travel that is lost.

My final though relates to one aspect of the Dinan springs I never liked. The scenario is four passengers, luggage in trunk, etc, essentially fully loaded. High speed (say 70mph) and hitting large bumps on the interstate or an off ramp; in the off ramp case especially one that is during a high speed turn. The rear would bottom into the bump stops hard and result in way too much oscillation and disturbing action. This wasn't present with the stock springs which are highly progressive once compressed a good bit, so they have a much higher spring rate to handle such an event (including more travel before hitting the bumpstops).

If I were you, I'd just add the rear sway bar and see how you like it. You will notice the change and enjoy the enhanced turn-in feel.

Current stable:

2019 M2 Competition 6MT LBB, slicktop
2011.5 M3 sedan 6MT Silverstone, slicktop: Dinan front swaybar, Eibach rear swaybar, pins-out-max-camber-up-front, Dinan exhaust, Michelin PS4S, Apex EC-7 9.5/10.5x19
2007 328i wagon Silver/gray: Eibach 28mm front swaybar, E93 M3 rear swaybar, 219M M3 wheels, Michelin PSAS3+
1975 CanAm 125MX2: Stock, original owner

Last edited by CSBM5; 8th May 2019 at 01:27 PM.
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post #7 of 11 Old 8th May 2019, 05:57 PM Thread Starter
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This is all great stuff. I am looking into the sway bar and strut brace. Those mods don’t seem intrusive and seem easily reversible. On strut feel is tough. I had a 99 SLK stick 230 that I recently sold to a friend. It had a smooth ride but bouncy. I ended up putting Bilstein B6 in it. On bumpy roads they could be jarring, but on highway was really smooth. They loosened up a bit over the year I had them in there. Cornering improved a lot but wasn’t sports car flat. I imagine this is what the Koni would be with stock springs.
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post #8 of 11 Old 9th May 2019, 06:29 AM
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If you dont need more hp than I would just look into the dinan swaybar. you can find other strut bars, front diff mount fix and monoball brands also. I love my bc coilovers and just lowered the front .5 to even out the look, you could run style 66 when your cruising around town with more sidewall to absorb the potholes.
few items that really helped my driving experience were the adjustable clutch stop and e60 shifter w/turner poly.
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post #9 of 11 Old 10th May 2019, 05:05 PM Thread Starter
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post #10 of 11 Old Yesterday, 05:39 AM
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Itís really bragging rights more than anything unless you have the entire suite of Dinan parts which are mostly reingineered factory parts and itís also a great selling point when mentioning you have Dinan upgrades.

I am actually going to be removing my Dinan diff after many years of great usage. There are better products out there today vs. something that was designed almost 2 decades ago.

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