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Discussion Starter · #1 ·
the shocks on my '91 m5 are shot and i am not sure of the best way to deal with the situaton. the car has 79k and the shocks are original. the car is stock except for a performance chip and cam sprocket. the car rolls too much during cornering and dives a bit under heavy braking. i understand that it is common to remove the self-leveling oe shocks and springs in the rear. should i go with performance coils all around with bilsteins or konis or use euro springs in the rear and keep the stock coils up front? it seems to me it would be helpful to lower the car some - but i do not want it to look like a boy-racer or city cruiser. my understanding is that h&r and eibach springs will lower the car 1 1/2" or more, which seems like a lot. i went with dinan springs, bars and bilsteins on my '87 e30 and it was a major improvement. should i go the same route with the m5? not surprisingly the dinan guy says their package for this car is far superior to any combination of other aftermarket products. the dinan set up for the m5 is the same kit they use for the regular e34, so will it do that much good on a m5 which is already lower than a stock e34? and finally, should i keep the oe sway bars? the dinan bars are 25mm in front and 19mm in the rear, which is not much different than stock. should i go with the euro-spec 19mm rear bar and leave the front bar stock?

thanks much guys. i'm really looking forward to hearing from you all about what has worked and not worked out in your suspensions.
 

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I use eibach with koni shocks, and I am very pleased with the results ...



JamesDumas said:
the shocks on my '91 m5 are shot and i am not sure of the best way to deal with the situaton. the car has 79k and the shocks are original. the car is stock except for a performance chip and cam sprocket. the car rolls too much during cornering and dives a bit under heavy braking. i understand that it is common to remove the self-leveling oe shocks and springs in the rear. should i go with performance coils all around with bilsteins or konis or use euro springs in the rear and keep the stock coils up front? it seems to me it would be helpful to lower the car some - but i do not want it to look like a boy-racer or city cruiser. my understanding is that h&r and eibach springs will lower the car 1 1/2" or more, which seems like a lot. i went with dinan springs, bars and bilsteins on my '87 e30 and it was a major improvement. should i go the same route with the m5? not surprisingly the dinan guy says their package for this car is far superior to any combination of other aftermarket products. the dinan set up for the m5 is the same kit they use for the regular e34, so will it do that much good on a m5 which is already lower than a stock e34? and finally, should i keep the oe sway bars? the dinan bars are 25mm in front and 19mm in the rear, which is not much different than stock. should i go with the euro-spec 19mm rear bar and leave the front bar stock?

thanks much guys. i'm really looking forward to hearing from you all about what has worked and not worked out in your suspensions.
 

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James,

The M5 sits about 1" lower than your "regular" E34, are you sure HR and Eibach lower the M5 1.5" or the regular E34 by 1.5". If it's just the regular E34 then it will lower your M5 by only about .5" just like Dinan's springs.
Dinan's original setup was with Bilsteins in back and the stock shocks up front. Unfortunately I've never driven a stock suspension M5 so I can't tell you how much a difference Dinan's mods make. What I can tell you is that the car is very balanced and that there is very little "roll" during cornering, squat and dive are very minimal--All very impressive for such a big and heavy car. Ride quality is not nearly as nice as say my parents 535 but considering how much better it handles I consider it a worthy tradeoff.
 

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Discussion Starter · #4 ·
good to know that the eibach springs and konis are working out for you. can you tell me how much the eibachs lowered the car from stock? i have seen some e34s that have been really slammed. i want to make the car a little more aggressive but not over the top. thanks...........and re sway bars, did you stay stock or what? i was thinking of going to the either the 19mm or 20mm bmw euro bar for the rear to try and make the car handle more neutral. has anybody tried the 20mm rear bar?
 

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Discussion Starter · #5 ·
no, i am not sure how much eibach and hr lower a m5. hopefully someone who has done it can tell me. but it looks like you have the full dinan suspension package. is it lower than stock? and what about dinan's sway bars - if the stock m5 bars are 25mm in the front and 18mm in the rear, how can the dinan bars be all that much different since theirs are 25mm and 19mm? why not just use either the euro bmw 19 or 20mm rear bars? thanks..........
WylM5 said:
James,

The M5 sits about 1" lower than your "regular" E34, are you sure HR and Eibach lower the M5 1.5" or the regular E34 by 1.5". If it's just the regular E34 then it will lower your M5 by only about .5" just like Dinan's springs.
Dinan's original setup was with Bilsteins in back and the stock shocks up front. Unfortunately I've never driven a stock suspension M5 so I can't tell you how much a difference Dinan's mods make. What I can tell you is that the car is very balanced and that there is very little "roll" during cornering, squat and dive are very minimal--All very impressive for such a big and heavy car. Ride quality is not nearly as nice as say my parents 535 but considering how much better it handles I consider it a worthy tradeoff.
 

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JamesDumas said:
the shocks on my '91 m5 are shot and i am not sure of the best way to deal with the situaton. the car has 79k and the shocks are original. the car is stock except for a performance chip and cam sprocket. the car rolls too much during cornering and dives a bit under heavy braking. i understand that it is common to remove the self-leveling oe shocks and springs in the rear. should i go with performance coils all around with bilsteins or konis or use euro springs in the rear and keep the stock coils up front? it seems to me it would be helpful to lower the car some - but i do not want it to look like a boy-racer or city cruiser. my understanding is that h&r and eibach springs will lower the car 1 1/2" or more, which seems like a lot. i went with dinan springs, bars and bilsteins on my '87 e30 and it was a major improvement. should i go the same route with the m5? not surprisingly the dinan guy says their package for this car is far superior to any combination of other aftermarket products. the dinan set up for the m5 is the same kit they use for the regular e34, so will it do that much good on a m5 which is already lower than a stock e34? and finally, should i keep the oe sway bars? the dinan bars are 25mm in front and 19mm in the rear, which is not much different than stock. should i go with the euro-spec 19mm rear bar and leave the front bar stock?

thanks much guys. i'm really looking forward to hearing from you all about what has worked and not worked out in your suspensions.
James - I have the dinan stage 3 kit - dinan springs and bilsteins all around, with camber plates on the fron and new adjustable roll bars. Whilst it might nbe a bit lower - you would be pushed to notice.

Handling transformed - but at the cost of the ride especially over rough roads. it all smooths out at about 100mph though :biggrin:

I did it becasue I go on a number of track days - with AP brakes and p zero corsa tyres, i can now keep pace with a well driven M3 CSL
 

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MBrasil said:
I use eibach with koni shocks, and I am very pleased with the results ...
Neither Eibach nor Koni list a spring/shock available for the E34 M5. What are your part numbers if you remember. I am in the same situation that I want to ditch the SLS due to its leakage.
 

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I have the Dinan springs with the SLS. Dinan says to keep it because of its "geometry" when carrying loads. I will say that with passengers, it rides very well. The lowering is slight at best. I didn't think the car had been done when I picked it up. Later when I compared it to "before" photos, a 1/2 inch drop was noticeable. With just a driver, I prefer my friend's set up of delete SLS and Konis and Eibachs. It just depends what the primary function of the vehicle will be.
 

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Brad Simpson said:
I have the Dinan springs with the SLS. Dinan says to keep it because of its "geometry" when carrying loads. I will say that with passengers, it rides very well. The lowering is slight at best. I didn't think the car had been done when I picked it up. Later when I compared it to "before" photos, a 1/2 inch drop was noticeable. With just a driver, I prefer my friend's set up of delete SLS and Konis and Eibachs. It just depends what the primary function of the vehicle will be.
Oops, I meant H & R springs, sorry.
 

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Discussion Starter · #10 ·
good to know - why do you like the h&r and koni set-up better? i assume the h&rs lower the car more - how much do you think? is the ride on the street a lot more harsh than your dinan suspension? i don't plan on taking the car on the track - just want to improve how it corners at speed on the street. what is the best way to correct the e34's tendency to understeer? does your dinan set-up make the car more neutral?
Brad Simpson said:
Oops, I meant H & R springs, sorry.
 

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JamesDumas said:
good to know - why do you like the h&r and koni set-up better? i assume the h&rs lower the car more - how much do you think? is the ride on the street a lot more harsh than your dinan suspension? i don't plan on taking the car on the track - just want to improve how it corners at speed on the street. what is the best way to correct the e34's tendency to understeer? does your dinan set-up make the car more neutral?
This is not going to sound very scientific. The car feels more planted. The H & Rs get you right above the outer profile of the tire. The Dinan springs about 1/2 inch higher, but that makes a big difference in handling. Dinan gets you there when the car is fully loaded with passengers and luggage and the SLS is compensating. Adjustable shocks are better because you can dial in your confort and performance equations. I have staggered M - parallels with 235/40 and 265/35/38 pilots. Even with the standard bar, not touring, the car is more neutral. Neither spring is harsh.
 

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Sorry, don't know the part number. But I can say that my car IS lower, but with the konis in loose position the car is pretty soft (at least for me) The back seems a bit low, but no big deal. My konis are yellow ones and I use eibach pro-kit



OZ///M5 said:
Neither Eibach nor Koni list a spring/shock available for the E34 M5. What are your part numbers if you remember. I am in the same situation that I want to ditch the SLS due to its leakage.
 

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JamesD said:
good to know - why do you like the h&r and koni set-up better? i assume the h&rs lower the car more - how much do you think? is the ride on the street a lot more harsh than your dinan suspension? i don't plan on taking the car on the track - just want to improve how it corners at speed on the street. what is the best way to correct the e34's tendency to understeer? does your dinan set-up make the car more neutral?
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Hi JamesD

Last month I drove in a freinds car, a 3,6 with HR springs - it was quite honestly the best ride I had been in.

I have the touring bar at the back on my 3,8, its a little bit stiffer and more precise at the rear now.

I have ordered a 26mm front bar from Vererra Road and Sport which is custom made from a torsionally stiffer material.

Front EDC's are being replaced on Wednesday 6th July, whoopee!! At the same time BMW will install the HR springs all round and obviously do a KDS wheel/height alignment.

I personally would consider this the best non-track going set up for the car, as when I rode in a similar set up the car was superbly stiff on the corners and not overly bumpy on uneven surfaces. I was very impressed.

ELt us know what you decide, it will be interesting to compare the ride qualities of our different set ups (assuming you opt for a differing set up to me).
 

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Discussion Starter · #14 ·
hello from san francisco jahangeer!

thanks for the good info. driving the beast around the hills of the city require a tight suspension!

so i guess you had the hr springs installed this week, right? can you tell me exactly how much they lowered the car? and what kind of shocks are you running? based on what you and others have said, i think i'm going to match the hr springs with bilstein sports. re your friend's 3.6 that has the perfect ride - what shocks does he have?

i can't wait to get my new suspension so we can compare notes!

james

Jahangeer said:
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Hi JamesD

Last month I drove in a freinds car, a 3,6 with HR springs - it was quite honestly the best ride I had been in.

I have the touring bar at the back on my 3,8, its a little bit stiffer and more precise at the rear now.

I have ordered a 26mm front bar from Vererra Road and Sport which is custom made from a torsionally stiffer material.

Front EDC's are being replaced on Wednesday 6th July, whoopee!! At the same time BMW will install the HR springs all round and obviously do a KDS wheel/height alignment.

I personally would consider this the best non-track going set up for the car, as when I rode in a similar set up the car was superbly stiff on the corners and not overly bumpy on uneven surfaces. I was very impressed.

ELt us know what you decide, it will be interesting to compare the ride qualities of our different set ups (assuming you opt for a differing set up to me).
 

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JamesD said:
hello from san francisco jahangeer!

thanks for the good info. driving the beast around the hills of the city require a tight suspension!

so i guess you had the hr springs installed this week, right? can you tell me exactly how much they lowered the car? and what kind of shocks are you running? based on what you and others have said, i think i'm going to match the hr springs with bilstein sports. re your friend's 3.6 that has the perfect ride - what shocks does he have?

i can't wait to get my new suspension so we can compare notes!

james
----------------------

Hi there

Well, I got the springs put on with the new edc's and you dont notice anything in a straight line (of-course), but as soon as you are going say 60kmh through a curve the car has minimum body roll, we did a high speed test also - same result when the edc are activated - there is virtually no body roll, I have a strut bar across the engine also - so this may help. But I am very happy, unfortunately BMW did not have time to do the KDS alignment - but will do this on Monday. The car is lowered 10mm at the back - using the SLS system, and 30mm at the front.

The guy with the 3.6 has hr springs but has 19" wheels BBS's we have both had the inside of the fender plastic rolled to make more room.

I have heard that Konis are better than Bilstein - though this off-course is purely subjective. Ask at a good suspension specialist re this issue.

Well we are haveing a heat wave here, its 34c and has been for a week, so - time to get the aircon running and do some serious cornering!!

ciao
 

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Koni's have a tendency to fail on the E30 models, I hope this is not true of the E34 shocks.
 

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James, I have been considering renewing my dampers all round, I am leaning towards koni sport dampers (top adjustable, red in colour), I have heard that Koni's are meant to be better than Bilstein as well. I have also considered fitting 3.6 M5 dampers with Eibach springs. I understand that any e34 damper will fit the M5 and as my EDC has been de-activated I can consider the aforementioned options, I think the decision will go to Koni and Eibach. If you check out ebay.de there is usually a few h&r and kw spring sets available. I think any springs from a respected manufacturer will be a safe option and regarding ride heights - as previously mentioned, the lowering heights will be in comparison to a non M set up.
cheers,
Phil.
p.s. I am not long back from a trip to the states, my wife and I visited, L.A., Sedona, Vegas, Sequoia, Monteray, San Francisco & N.Y. Travelling along some fantastic road's all the way, the fact that we were not in my M5 was the only disapointment. We both thought San Francisco was excellent. I was hoping to do a scene from Bullit with the hire car but it had to go back the day after we arrived......maybe next time.
 

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Phlem5 said:
James, I have been considering renewing my dampers all round, I am leaning towards koni sport dampers (top adjustable, red in colour), I have heard that Koni's are meant to be better than Bilstein as well. I have also considered fitting 3.6 M5 dampers with Eibach springs. I understand that any e34 damper will fit the M5 and as my EDC has been de-activated I can consider the aforementioned options, I think the decision will go to Koni and Eibach. If you check out ebay.de there is usually a few h&r and kw spring sets available. I think any springs from a respected manufacturer will be a safe option and regarding ride heights - as previously mentioned, the lowering heights will be in comparison to a non M set up.
cheers,
Phil.
p.s. I am not long back from a trip to the states, my wife and I visited, L.A., Sedona, Vegas, Sequoia, Monteray, San Francisco & N.Y. Travelling along some fantastic road's all the way, the fact that we were not in my M5 was the only disapointment. We both thought San Francisco was excellent. I was hoping to do a scene from Bullit with the hire car but it had to go back the day after we arrived......maybe next time.
--------------

There is an article in the US motor mag Motor Trend, about the car chase in Bullitt.
 

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JamesD said:
the shocks on my '91 m5 are shot and i am not sure of the best way to deal with the situaton. the car has 79k and the shocks are original. the car is stock except for a performance chip and cam sprocket. the car rolls too much during cornering and dives a bit under heavy braking. i understand that it is common to remove the self-leveling oe shocks and springs in the rear. should i go with performance coils all around with bilsteins or konis or use euro springs in the rear and keep the stock coils up front? it seems to me it would be helpful to lower the car some - but i do not want it to look like a boy-racer or city cruiser. my understanding is that h&r and eibach springs will lower the car 1 1/2" or more, which seems like a lot. i went with dinan springs, bars and bilsteins on my '87 e30 and it was a major improvement. should i go the same route with the m5? not surprisingly the dinan guy says their package for this car is far superior to any combination of other aftermarket products. the dinan set up for the m5 is the same kit they use for the regular e34, so will it do that much good on a m5 which is already lower than a stock e34? and finally, should i keep the oe sway bars? the dinan bars are 25mm in front and 19mm in the rear, which is not much different than stock. should i go with the euro-spec 19mm rear bar and leave the front bar stock?

thanks much guys. i'm really looking forward to hearing from you all about what has worked and not worked out in your suspensions.
James

My 91 M5 had the suspension problems you describe. And the rear self-levelling shocks and accumulators were leaking. I decided to remove the self-levelling suspension (Bavarian makes a nice kit, for this job), and tried to remain fairly close to stock other than that. I replaced the shocks with Koni adjustables (better than OEM or Bilsteins, for E34 M5's, I understand); replaced the front springs with OEM; replaced the rear springs with 535 M Technik (OEM do not work, with self-levelling suspension removed); replaced the rear anti-sway bar with the larger OEM touring bar; replaced the front strut mounts with BMW camber correcting ones (half a degree removed from stock camber setting); and while I was at it had a lot of other parts replaced (the mounts for the engine, transmission and sub-frame; the idler arm, upper control arms, pitman arms, tie rods, etc.) The front clearance is unchanged, but the rear clearance (which was virtually nil before) is increased (to stock, or so close I cannot tell the difference). The result was fantastic; the car feels brand new; rock solid and glued to the road, and the ride is not too hard (do not ask my wife's views on that latter comment, however...) I have the front Konis set at one turn off full soft.

Andrew
 

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If anyone needs a set of H&R springs or Koni shocks please let me know.

I will be fitting the H&R's within the next few days, just thinking if I should get the Koni's in aswell.
 
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