[jetbill]

Anyone know what the factory spring rates are for the various variants of the F30? Specifically the M-Sport?

I also can't seem to find any published rates for the Eibach springs , H&R typically doesn't publish the rates but I'm curious about the increase to H&R from a stock M-Sport with DHP.

Seems as if some like going from stock M-Sport with DHP to H&R sport and some feel its to bouncy (or under damped).

My guess is the alternative is to wait for Dinan's springs and software upgrade for the DHP (or M-adaptive suspension)

[vip]

I am also curious!! Same boat as you.. Shall I do H&R sport with Bilstein b8 or wait for dinan...

[motex]

Originally Posted by jetbill

Anyone know what the factory spring rates are for the various variants of the F30? Specifically the M-Sport?

I also can't seem to find any published rates for the Eibach springs , H&R typically doesn't publish the rates but I'm curious about the increase to H&R from a stock M-Sport with DHP.

Seems as if some like going from stock M-Sport with DHP to H&R sport and some feel its to bouncy (or under damped).

My guess is the alternative is to wait for Dinan's springs and software upgrade for the DHP (or M-adaptive suspension)

On behalf a friend who owns a 2013 335i F30 Sedan, he wants to know how hard will get the car switching from standard OEM suspension to the M Performance suspension?
As far as I understand the M suspension also lowers the car 1 inch?

[OC40]

Originally Posted by motex

On behalf a friend who owns a 2013 335i F30 Sedan, he wants to know how hard will get the car switching from standard OEM suspension to the M Performance suspension?
As far as I understand the M suspension also lowers the car 1 inch?

Pics - 2013 335i after MPS settled http://www.f30post.com/forums/showthread.php?t=903414

[jetbill]

Here's some info from Eibach' site:
http://performance-suspension.eibach...13_pro-kit.pdf

OE Rate FRONT-160LB
OE Rate REAR- 486LB

The rates shown do not explicitly indicate which model "line" F30 (base/sport/M-sport).

Interesting that Eibach indicates the changes the Pro-Kit makes to the camber and toe specifications. A "reduction" in both camber and toe when the Pro-Kit is added.

[Sedan_Clan]

Good info. I'm curious about the spring rate on the H&R Sports vs the OE M Sport springs myself.

[jetbill]

The front springs are substantially shorter with a material thickness simalar to that of the OEM M- Sport spring (which should be the same as the F30 Sport Suspension). The ID measurements vary because they are progressive springs, its a bit difficult to get the ID dimensions so I made the best attempt.

Based on the design of the top of the front H&R springs it appears that they are a bet less progressive which could be a good thing to alleviate the slight initial roll on the stock M-Sport suspension.

The rear H&R springs are about 3/4" shorter in length overall with the same diameter maybe adding a half off a coil with the same material thickness.

H&R rates:
Unfortunately my micrometer battery was dead but those of you whom would enjoy calculating spring rate using the various mathematical calculations available can do so if your able to read the dimensions in the pictures( if not PM me and ill try to get them).

Next to install them and give a road track test assessment of them.

[USC2000]

Originally Posted by jetbill

The front springs are substantially shorter with a material thickness simalar to that of the OEM M- Sport spring (which should be the same as the F30 Sport Suspension). The ID measurements vary because they are progressive springs, its a bit difficult to get the ID dimensions so I made the best attempt.

Based on the design of the top of the front H&R springs it appears that they are a bet less progressive which could be a good thing to alleviate the slight initial roll on the stock M-Sport suspension.

The rear H&R springs are about 3/4" shorter in length overall with the same diameter maybe adding a half off a coil with the same material thickness.

H&R rates:
Unfortunately my micrometer battery was dead but those of you whom would enjoy calculating spring rate using the various mathematical calculations available can do so if your able to read the dimensions in the pictures( if not PM me and ill try to get them).

Next to install them and give a road track test assessment of them.

Are those the sport or super sport springs?
Also did you happen to check the weight?

[Sedan_Clan]

Originally Posted by USC2000

Are those the sport or super sport springs?
Also did you happen to check the weight?

Sport. Super Sports are red!

[jetbill]

Just a quick follow up.

After the springs have settled a bit
I measured the drop. Turner Motorsports indicated about 0.8 drop in the front and rear for cars with the sport suspension.

I measured 1.1 in the front and 0.8 in the rear. The drop is just about perfect, if any more I probably wouldn't be too happy-it's perfect.

We threw the car up on an alignment rack to check the settings and the springs increased toe in the front out of factory specs but within my preference (close to 0) camber in the front and rear changed slightly and toe in the rear increased, overall we left the car alone with no changes to the suspension.

The spring rate has increased slightly. If I had I guess it's a 20% increase at best. I have not experienced any bottoming at all, if I did, they would be off the car the next day.

At the track this weekend the increase in spring rate and lower COG was definitely noticeable with less body roll. Add a H&R Front sway bar when its available to the public you just might have a perfect mild track setup.

I drive in both Comfort and Sport modes and with DHP the car is perfect in both. It's not the Dinan Shockware upgrade but for $243 bucks @ Turner and about 3 hours it was worth it.

[DVC]

Good info - thanks for sharing.

Did you consider at all the M Performance springs? Not sure what the rates are on them, but apparently they are a bit stiffer than OEM Sport springs...
I have been holding out for the Dinan kit, but I'm losing patience and am considering just doing springs with my DHP for the time being - the goal being something a little firmer (which IMO should match up with the DHP dampers in sport mode nicely), and only a little lower (10mm should be plenty, as I have the M Performance front splitter).

[jetbill]

Originally Posted by DVC

Good info - thanks for sharing.

Did you consider at all the M Performance springs? Not sure what the rates are on them, but apparently they are a bit stiffer than OEM Sport springs...
I have been holding out for the Dinan kit, but I'm losing patience and am considering just doing springs with my DHP for the time being - the goal being something a little firmer (which IMO should match up with the DHP dampers in sport mode nicely), and only a little lower (10mm should be plenty, as I have the M Performance front splitter).

Our cars are identical with exception of RE-11's on 403M's. the splitter is about 3-3.5 inches from the ground. I haven't scrapped anywhere but will not likely ever make it through a car wash if I tried (which I really shouldn't anyway).

Ill have to get a picture.

As far as performance, it's definitely an improvement but not drastic.

[jetbill]

Second picture is a colleagues red F30 328 Sport for reference.

[2blu]

Your car looks great ! Perfect drop IMO I wouldn't want it any lower than this. Any rubbing on speed bumps (if you've encountered them) ?

[jetbill]

Originally Posted by 2blu

Your car looks great ! Perfect drop IMO I wouldn't want it any lower than this. Any rubbing on speed bumps (if you've encountered them) ?

No rubbing on splitter (have to be a bit careful pulling in on angles when applicable) or fenders.

Running 10 and 15 mm spacers front and rear with 245/35/19 (slight size increase in the front from 225) and stock 255/35/19 rear.

[2blu]

That's exactly the stance I would want on my car.

[.BMW.]

Originally Posted by jetbill

Running 10 and 15 mm spacers front and rear with 245/35/19 (slight size increase in the front from 225) and stock 255/35/19 rear.

Any close up pictures of the front fitment?

Would be interesting to see how it looks with 245 on OEM wheels up front combined with 10mm spacers!

[sainismo]

Originally Posted by jetbill

No rubbing on splitter (have to be a bit careful pulling in on angles when applicable) or fenders.

Running 10 and 15 mm spacers front and rear with 245/35/19 (slight size increase in the front from 225) and stock 255/35/19 rear.

I just got my sports springs installed today, which brand of spacers are you using may i ask?

[vip]

Anyone running m performance springs and bilstein b8 shocks?

[jetbill]

Originally Posted by ss0803

Any close up pictures of the front fitment?

Would be interesting to see how it looks with 245 on OEM wheels up front combined with 10mm spacers!

Not the best picture but you get the idea.

[jetbill]

Originally Posted by sainismo

I just got my sports springs installed today, which brand of spacers are you using may i ask?

H&R spacers from Turner but they're all similar (more confident in H&R's manufacturing tolerances).

[momo3605]

Originally Posted by vip

Anyone running m performance springs and bilstein b8 shocks?

I don't think anyone is running M performance springs separate from the M performance shocks yet