[M_Power Rob]

Originally Posted by Humdizzle

yes. but they can't change physics. BMW designed this spring and shock combo together. if you lower the car down an inch your shock is now one inch more compressed. your suspension is going to be stiffer in that spot and not be able to handle smaller road bumps as well. it was not tuned to stay in that compressed state 24/7.

you may have a slight improvement in lap time. but you can have that and ride comfort with a proper coil over setup.

Of course it will be stiffer, and the tighter the spring/lower you set it (whether just different fixed height springs or adjustable springs) the more unforgiving it will be on bumps, pot holes and dips (or other road imperfections). That is why the spring one uses, manufacturer and making sure you order the springs made for the G87 specifically (not just saying you can use the same part for all G8X cause there is no difference because some company wants your money or you have to have it first and now) is crucial.

Going with a coilover for street driving (no intention of tracking the car) just does not make sense unless one has to have the most toys and/or money is not an issue for an unwarranted upgrade.

[ourlee]

For those who say the HAS is better than lowering springs, other than the ability to adjust the height, please explain what you feel the difference is (I have the H&R adjustable on my B9 S5 since January 2018 (car purchased in December 2017) and have never adjusted them from the initial setting we used when installed...only went with them as that was the only spring available for the car at the time).

For me it’s the LOWness vs regular springs. Here’s my TT on MSS HAS and yellow konis
..

[M Division]

Originally Posted by Tag

Before I get into the pros and cons I need to point out that quality products are essential when modifying your suspension. You want ones from reputable manufacturers that are specifically designed for your car and you want ones with spring rates that are matched to the OEM dampers if using lowering springs or a HAS kit. If you buy something that isn't from a reputable brand and hasn't had the proper R&D for the G87 and have clunking noises, blown out struts/shocks, etc. that's on you! I'm also not going to get into the cost of installing each type, they all involve more or less the same amount of work so the cost delta between installing each type isn't that big. Now that that's out of the way let's get to work!

Lowering Springs
Pros:
Inexpensive
Lets you retain adaptive suspension
......

Some HAS kits (such as MSS) also sit on the stock perch, they actually place a thick adaptor plate on top of the stock perch, and thus have even shorter springs and greatly reduced travel then a pure Lowering Spring, and that's not even accounting for the height adjusters which take up even more spring real estate, meaning that the remaining spring in these HAS kits is much, much shorter then the orignal stock spring or a lower spring that offers the same drop.

Only HAS kits supplied with a new perch that replace the stock perch actually offer the listed Pros when compared to a Lower Spring.

Good summary though.

[Tag]

Originally Posted by M Division

Some HAS kits (such as MSS) also sit on the stock perch, they actually place a thick adaptor plate on top of the stock perch, and thus have even shorter springs and greatly reduced travel then a pure Lowering Spring, and that's not even accounting for the height adjusters which take up even more spring real estate, meaning that the remaining spring in these HAS kits is much, much shorter then the orignal stock spring or a lower spring that offers the same drop.

Only HAS kits supplied with a new perch that replace the stock perch actually offer the listed Pros when compared to a Lower Spring.

Good summary though.

Any HAS kit that doesn't lower the perch or come with shorter bump stops, like the MSS, is not a quality HAS kit.

[Tag]

Originally Posted by ourlee

For those who say the HAS is better than lowering springs, other than the ability to adjust the height, please explain what you feel the difference is (I have the H&R adjustable on my B9 S5 since January 2018 (car purchased in December 2017) and have never adjusted them from the initial setting we used when installed...only went with them as that was the only spring available for the car at the time).

For me it’s the LOWness vs regular springs. Here’s my TT on MSS HAS
..

Maybe this will help.

[Bumpinjeep]

I chose the KW HAS because it lowers the ride height to my liking, maintains the EDC, is made by a reputable company that BMW trusts to simply rebrand the product as M-Performance H.A.S., is affordable, and in the event of selling the car, I can simply return it to stock and sell the kit. Oh and it improves the handling of the car or in other words, doesn't degrade it.

[M_Power Rob]

Originally Posted by Bumpinjeep

I chose the KW HAS because it lowers the ride height to my liking, maintains the EDC, is made by a reputable company that BMW trusts to simply rebrand the product as M-Performance H.A.S., is affordable, and in the event of selling the car, I can simply return it to stock and sell the kit. Oh and it improves the handling of the car or in other words, doesn't degrade it.

If you are having the HAS port installed, that is your "stock" suspension and will be ahown on your window sticker. You wont have any ither components to change it to.

If installing after taking delivery, than yes, you could remove and replace the "original" to return it to stock.

[kimchee411]

Last 4 cars I went lowering springs first, didn't like the busier ride (+ bottoming out in one of them), and later got matched dampers/coilovers. I don't learn too gud. Never again! Always match dampers to springs.

[Xspeedracer]

Fully adjustable coil overs are the only way to go if you plan on tracking, or autocrossing and price is up there for good quality with a warranty as someone with 20 years of track experience and setting up customer cars when I worked for an Audi performance shop 2Bennett in Davis I learned a lot you really do get why you pay for cheap shocks are the biggest issues with kits out there

[chrisg123]

Originally Posted by Bumpinjeep

I chose the KW HAS because it lowers the ride height to my liking, maintains the EDC, is made by a reputable company that BMW trusts to simply rebrand the product as M-Performance H.A.S., is affordable, and in the event of selling the car, I can simply return it to stock and sell the kit. Oh and it improves the handling of the car or in other words, doesn't degrade it.

I know I’m coming here late. I recently got a slightly used m2 g87 that has kw has installed. I just feel the rice is to harsh. Would lowering springs maybe be less harsh or do I need to get expensive coil overs to fix this? Your telling me you enjoy the stiff ride with the has kw? It also I think makes the steering harder. I’m on a road trip constantly having to adjust the car from tram lining. I do have a good alignment. It’s just that the car isn’t the most relaxing car to drive. Maybe I should have saved for a 911.

[Tag]

Originally Posted by chrisg123

I know I’m coming here late. I recently got a slightly used m2 g87 that has kw has installed. I just feel the rice is to harsh. Would lowering springs maybe be less harsh or do I need to get expensive coil overs to fix this? Your telling me you enjoy the stiff ride with the has kw? It also I think makes the steering harder. I’m on a road trip constantly having to adjust the car from tram lining. I do have a good alignment. It’s just that the car isn’t the most relaxing car to drive. Maybe I should have saved for a 911.

Before looking to change out the suspension you might want to try raising the car a bit. You can do it yourself or take it to a shop and it would be a fraction of the cost compared to getting something else. Sounds like your car might be lowered a bit too much and is riding the bump stops.

[aerobod]

Originally Posted by Tag

Before looking to change out the suspension you might want to try raising the car a bit. You can do it yourself or take it to a shop and it would be a fraction of the cost compared to getting something else. Sounds like your car might be lowered a bit too much and is riding the bump stops.

To add to that, the bump stops may also be incompatible with the setup. The stock ones are likely too long when the car is lowered, I would check the correct length KW ones have been fitted and that the front and rear ones haven’t been mixed up, as they are different heights.

[M_Power Rob]

Originally Posted by chrisg123

I know I’m coming here late. I recently got a slightly used m2 g87 that has kw has installed. I just feel the rice is to harsh. Would lowering springs maybe be less harsh or do I need to get expensive coil overs to fix this? Your telling me you enjoy the stiff ride with the has kw? It also I think makes the steering harder. I’m on a road trip constantly having to adjust the car from tram lining. I do have a good alignment. It’s just that the car isn’t the most relaxing car to drive. Maybe I should have saved for a 911.

Describe what you mean by harsh. The KW HAS should not produce a stiff or bouncy ride (I am lowered all the way and on 20" front and rear and it rides fine when driving normally. Coilovers will give you a much stiffer ride, amongst other differences.

I will be going to coilovers for the reason with my added power (stage 2 on E blend over 700whp) and at higher speeds, the HAS doesn't provide the necessary stability

[chrisg123]

Thx. I just fell the steering is a little harder with the lowering. And car does seem a little harsh. But it is not a luxury car so that’s probably normal. I’ll drive my friends m2 with same set up and see how it compares.

[chrisg123]

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[M_Power Rob]

Originally Posted by chrisg123

Thx. I just fell the steering is a little harder with the lowering. And car does seem a little harsh. But it is not a luxury car so that’s probably normal. I’ll drive my friends m2 with same set up and see how it compares.

What do you gave the settings at when driving (8AT or 6MT?)? What size rims/tires, and what tires?

[M2PDX]

I went with aftermarket KW HAS, but would do port installed MP HAS if I had to do it over again, and gotten the factory warranty and avoidance of any headaches down the road.

[Montaver]

I've been through a lot of aftermarket suspension (multiple sets of Ohlins, MCS) etc.) on a number of different cars including heavy track time. I think the G87 suspension is very good out of the box, and a big improvement over BMW's past. For the street I would just do a HAS kit which has modified bump stops and go with a mild drop. DINAN would be my choice. For the track different story depending on your experience/ use case.

[gondolafanclub]

im coming from a stock f87 comp (feels very stiff)- comparing apples to apples, how is the MPHAS ride compared to the stock g87 springs? The g87 has adaptive suspension that the f87 didnt but what are you losing by going HAS from stock g87? It doesnt feel any different but you lose <1/2" of travel?
Just wondering- I'm sure the car would look better dropped a little bit but is it a noticeable feel?

[chrisg123]

I just drove the car back from Kansas to Florida. I bought it in Kansas. On some roads tge suspension felt harsh. But back here in Florida the suspension even with the has feels soft in sport everything. I had an f82 m4 for 3 years before this on hand r springs. But that suspension felt so much more stiff. This new g series feels really soft and kind of disconnected. I mean the engine is a monster and everything and I know the car is better. But it kind of like the f series was more fun. Oh well. I’ll focus on the positives. I could always add away bars and maybe coil overs to make it feel more raw. Maybe if I lighten the car with wheels that will make it feel better as well.

[chrisg123]

Originally Posted by gondolafanclub

im coming from a stock f87 comp (feels very stiff)- comparing apples to apples, how is the MPHAS ride compared to the stock g87 springs? The g87 has adaptive suspension that the f87 didnt but what are you losing by going HAS from stock g87? It doesnt feel any different but you lose <1/2" of travel?
Just wondering- I'm sure the car would look better dropped a little bit but is it a noticeable feel?

I had adaptive suspension on my f82 m4 before this car. I had a supercharged e92 m3 manual for 5 years before that.

[Ronin76]

Well well well…this thread is getting some traction….only took a year!!! LOL