Looking at lowering a M37s. Need advice.

[LeRoy712]

Hi fellas. Looks like I am going to be picking up my 2012 M37s this weekend and I am going to do a couple of mods right off the bat including lowering the car. As of right now I plan on keeping the stock sport rims while lowering the car and adding the ARK GRiP exhaust. I have lurked in this forum for a while and it seems we have very few options in springs or coilovers. As of now I am looking to do the Eibach springs, but I am worried its not going to be low enough for me. I have seen a few of pics of M37's with Eibachs and some look perfect while others still look kind of high to me. I am not looking at slamming the vehicle or looking at getting new wheels so I don't see the need for full coilovers. So my question would be am I stuck with only Eibach or Tanabe for springs options and BC, Megan and Tanabe for coilovers? If I swap out my struts with the Eibach springs could that offer me another .5 inch of drop? I'd appreciate any help or advice. Thanks!

[Debonair]

Just the fact that you are asking about whether the springs will be low enough or not tells me you know exactly where you want the ride height to be. Get the coil overs save yourself the grief of being unhappy.

I went with lowering spring on my last car and was unhappy the whole time that I could not set it where I wanted it. I did not make that mistake on this car.

And changing the struts will not lower the car, on the springs will do this.

[Ilya]

What Debonair said. Get BC coils.

[LeRoy712]

Thanks for the replies. I have a couple of questions regarding the BC coilovers. First is what is the "clunking" noise I read about with these. Second I see BC coilovers and an option for Swift springs along with them. Are the Swift springs worth the up charge? Last how is the ride quality?

Anybody here run the Tanabe Sustec Pro Comfort coilovers?

[Debonair]

Thanks for the replies. I have a couple of questions regarding the BC coil overs. First is what is the "clunking" noise I read about with these. Second I see BC coil overs and an option for Swift springs along with them. Are the Swift springs worth the up charge? Last how is the ride quality?

The clunking noise has plagued many BC coilovers for many vehicle applications. The M37/M56/Q70 does not seem to be one of them. I have no clunk or odd noises at all. The ride quality is as good as I would expect it. Smooth on smooth roads. A little more firm over some bumps as is expected with reduced travel from the drop. They are very good in the corners and sweeping highway ramps.

Swift Springs were discussed HERE. Here is some info I posted in that thread from a now defunct website.

The Swift springs offer several upgrades from the standard BC springs. Here is a list from The Best Coilover Guiide: Swift Springs. Worth it? which is a GREAT read for someone considering coilovers. If anyone is I highly suggest they check it out.

-
Swift Springs offer solutions to the problems we didn’t know we had:
-

• >The spring rate is consistent throughout the stroke: they are more predictable and more comfortable.
  >The largest amount of stroke: they are thinner and stronger, allowing for less coils, which allows for a greater amount of room for compression.
  >They are more durable against loss of spring height. Cold wound springs break in, then wear out, eventually their uncompressed height become less, due to having constant weight on them. They just wear out faster due to being made of an inferior material.
  >They weigh less than cold wound springs. If you’re not driving a race car you might not care too much about this one, but in truth, less unsprung weight makes a huge difference in both ride quality and performance.

I paid an extra $325 for the Swift springs and got free rear knob extenders too.

-
Swift Springs Summary
-
Common springs are made out of a silicone chrome material, because Swift Springs are stronger they can be made thinner and could be wound with fewer coils, greatly reducing weight and allowing for a larger and far more consistent stroke.
The results speak for themselves. If Swift Springs are available, they are worth the extra dollar...

YES, Swift Springs are Worth your Money.

[LeRoy712]

Awesome info Debonair! Thanks.

[DailyM37]

Debonair is right on the money, I was not happy with the Eibach drop so I went the coilover route. Save yourself some money and stress. I have a post with the Eibachs on sport struts for reference if needed, selling the springs and struts too.

[Altered]

Definitely go with coils, the Eibachs aren't satisfactory to be honest. Not if you want it to look dropped. For the price/time of the install just do it right the first time and go for what you really want.

[mig0s]

Thanks for the replies. I have a couple of questions regarding the BC coilovers. First is what is the "clunking" noise I read about with these. Second I see BC coilovers and an option for Swift springs along with them. Are the Swift springs worth the up charge? Last how is the ride quality?

Anybody here run the Tanabe Sustec Pro Comfort coilovers?

I dont think Tanabe does AWD coilovers for the Y51. Only option for awd is BC if im not mistaken

[putim37s]

Below was my M on stock wheels and Eibach Springs:



I ran this setup for only 3 weeks. Although it rode great, there was just still too much fender gap for my taste. Learn from my mistake, and just get the coilovers. I've had the Tanabe Comfort R's for over 1.5 years and about 20k on them, and have not had any issues.

[LeRoy712]

Thanks for the replies. I have a couple of questions regarding the BC coilovers. First is what is the "clunking" noise I read about with these. Second I see BC coilovers and an option for Swift springs along with them. Are the Swift springs worth the up charge? Last how is the ride quality?

Anybody here run the Tanabe Sustec Pro Comfort coilovers?

I dont think Tanabe does AWD coilovers for the Y51. Only option for awd is BC if im not mistaken

My car is the RWD Y51. I see they make them for us non AWD owners. My guess is that the application is pretty new to the scene as there aren't any reviews on them for the y51. I see glowing reviews for the Sustec Pro Comfort for other vehicles though so it has caught my eye. Looks like the spring rates are pretty damn tame as well with the Tanabe set up which is more in line what I am looking for. They also would run me about $300-$400 cheaper than the BC's with the Swift springs. I have had all sorts of suspension set ups over the years with various vehicles, some great and others terrible. I'm a little OCD so I try and research the crap outta things and get real life opinions. I've been out of the scene for a while and I'm trying to play catch up. I appreciate all the feedback guys!

[LeRoy712]

Below was my M on stock wheels and Eibach Springs:



I ran this setup for only 3 weeks. Although it rode great, there was just still too much fender gap for my taste. Learn from my mistake, and just get the coilovers. I've had the Tanabe Comfort R's for over 1.5 years and about 20k on them, and have not had any issues.

Nice car! Thanks for the pics. How would you say the ride quality is on the Tanabe Comfort R's? I'd prefer as close to stock as possible while having it tighten up a bit in the corners.

[putim37s]

I think ride quality is subjective. I've been riding on lowered cars since '94. As a daily commuter, 22's, and a 30 series profile tire, I think it rides pretty good. I think the only down side to the Tanabe's is the lack of adjustable dampening, and the fact it uses OE top hats. The selling point for me was their claim of a comfortable ride, and their utilization of KYB Dampers.

[infinitedrift]

The BC clunk does plague these models. Not all but a lot from what I read when I was researching. For the OP, I ended up going with SCALE suspension and added SWIFT springs. My ride is amazing. Just giving you another option.

[mig0s]

My car is the RWD Y51. I see they make them for us non AWD owners. My guess is that the application is pretty new to the scene as there aren't any reviews on them for the y51. I see glowing reviews for the Sustec Pro Comfort for other vehicles though so it has caught my eye. Looks like the spring rates are pretty damn tame as well with the Tanabe set up which is more in line what I am looking for. They also would run me about $300-$400 cheaper than the BC's with the Swift springs. I have had all sorts of suspension set ups over the years with various vehicles, some great and others terrible. I'm a little OCD so I try and research the crap outta things and get real life opinions. I've been out of the scene for a while and I'm trying to play catch up. I appreciate all the feedback guys!

Oops read m37x in the title for some reason

[Debonair]

The BC clunk does plague these models. Not all but a lot from what I read when I was researching. For the OP, I ended up going with SCALE suspension and added SWIFT springs. My ride is amazing. Just giving you another option.

News to me. I have yet to read of the clunk on this car.

[beachbum718]

Most of the time the clunk from bc coilovers is from the installer.
You have to make sure you tighten/torque the coils while the weight of the car is on them.i personally loved my bc coils.only other coils i had before bc wad jic tar vip coilover which are close to 3 grand and are not made for the y51.comparing the 2.bc is right up there with them.i didnt buy swift springs with mine ether.if i didnt go air,id still be on my bc's.for the price.its worth it.

[SwissCheeseHead]

I can vouch for Tanabe Sustec coilovers. I had them on my G37 before I got my M. Perfect for a daily driver. Very comfortable. Not nearly as stiff as other coilovers that might have some track duty on them. I don't track, which was why they were great. i would get Tanabe again if they made an AWD version.

[kenslen]

Below was my M on stock wheels and Eibach Springs:



I ran this setup for only 3 weeks. Although it rode great, there was just still too much fender gap for my taste. Learn from my mistake, and just get the coilovers. I've had the Tanabe Comfort R's for over 1.5 years and about 20k on them, and have not had any issues.

How was the ride on Eibach Springs compare to OEM springs?
I just need a small drop of close that GAp on the fender.

[Durty504]

I just ordered some lowering springs From RS-2 for my M37X. The company is base in Japan, but now has a US office. If you look on the us site you will not see them available. After researching and finding the Japanese equivalent (Nissan Fuga 370gt awd or KNY51) I was able to see the company did make them for this car. I reached out to http://www.rs-r.com/ and someone their was able to assist. Since they isn't a high demand, they do not have them on stock in the US, so i have to pay for shipping..and this what i got back from them...i will keep you guys posted and post pictures once i am done with my MODs


Thank you for your patience. The part# you will need for your 2011 Infiniti M37X is N282D. These springs will be $309.00 + shipping.
RS-R Down Sus Springs - 2009+ Infiniti M37x
Part#: N282D
Price: $309.00 USD
Compatibility:
2009+ Infiniti M37x
Chassis code: KNY51

Approximate Drop:
Front -40mm to -45mm (-1.6inch to -1.8inch)
Rear -30mm to -35mm (-1.2inch to -1.4inch)

Spring Rates:
Front 7.34kg/mm
Rear 2.70kg/mm
Part# N282D is not an item that we usually keep in stock in the U.S., however, it is available to order and will ship out from Japan.

There will be two shipping methods available for you. The fastest way will be to air freight the package direct to your residence. Within the continental U.S., this will take approximately 7-10 business days and the charge will be $140.00 USD.

The second option is via boat freight to our warehouse here in the U.S. then shipped out to your residence via UPS Ground. This will take approximately 6-8 weeks, but the only shipping charge will be for the UPS Ground service.

[LeRoy712]

I just ordered some lowering springs From RS-2 for my M37X. The company is base in Japan, but now has a US office. If you look on the us site you will not see them available. After researching and finding the Japanese equivalent (Nissan Fuga 370gt awd or KNY51) I was able to see the company did make them for this car. I reached out to http://www.rs-r.com/ and someone their was able to assist. Since they isn't a high demand, they do not have them on stock in the US, so i have to pay for shipping..and this what i got back from them...i will keep you guys posted and post pictures once i am done with my MODs


Thank you for your patience. The part# you will need for your 2011 Infiniti M37X is N282D. These springs will be $309.00 + shipping.
RS-R Down Sus Springs - 2009+ Infiniti M37x
Part#: N282D
Price: $309.00 USD
Compatibility:
2009+ Infiniti M37x
Chassis code: KNY51

Approximate Drop:
Front -40mm to -45mm (-1.6inch to -1.8inch)
Rear -30mm to -35mm (-1.2inch to -1.4inch)

Spring Rates:
Front 7.34kg/mm
Rear 2.70kg/mm
Part# N282D is not an item that we usually keep in stock in the U.S., however, it is available to order and will ship out from Japan.

There will be two shipping methods available for you. The fastest way will be to air freight the package direct to your residence. Within the continental U.S., this will take approximately 7-10 business days and the charge will be $140.00 USD.

The second option is via boat freight to our warehouse here in the U.S. then shipped out to your residence via UPS Ground. This will take approximately 6-8 weeks, but the only shipping charge will be for the UPS Ground service.

Damn that drop sounds near perfect to me. I have heard good things about RS-R down springs on the g37's and Q50's. I decided to not go the coilover route and was about to pull the trigger on some Eibachs. However I'd love to see the drop on your ride once you get them installed and see how the ride quality is as well. Thanks for the info and let us know if you get them! Hopefully they have something for the RWD version.

[mig0s]

I just ordered some lowering springs From RS-2 for my M37X. The company is base in Japan, but now has a US office. If you look on the us site you will not see them available. After researching and finding the Japanese equivalent (Nissan Fuga 370gt awd or KNY51) I was able to see the company did make them for this car. I reached out to http://www.rs-r.com/ and someone their was able to assist. Since they isn't a high demand, they do not have them on stock in the US, so i have to pay for shipping..and this what i got back from them...i will keep you guys posted and post pictures once i am done with my MODs


Thank you for your patience. The part# you will need for your 2011 Infiniti M37X is N282D. These springs will be $309.00 + shipping.
RS-R Down Sus Springs - 2009+ Infiniti M37x
Part#: N282D
Price: $309.00 USD
Compatibility:
2009+ Infiniti M37x
Chassis code: KNY51

Approximate Drop:
Front -40mm to -45mm (-1.6inch to -1.8inch)
Rear -30mm to -35mm (-1.2inch to -1.4inch)

Spring Rates:
Front 7.34kg/mm
Rear 2.70kg/mm
Part# N282D is not an item that we usually keep in stock in the U.S., however, it is available to order and will ship out from Japan.

There will be two shipping methods available for you. The fastest way will be to air freight the package direct to your residence. Within the continental U.S., this will take approximately 7-10 business days and the charge will be $140.00 USD.

The second option is via boat freight to our warehouse here in the U.S. then shipped out to your residence via UPS Ground. This will take approximately 6-8 weeks, but the only shipping charge will be for the UPS Ground service.

Seems like a weak drop :S

Arent Eibachs pretty much the same?

[LeRoy712]

I just ordered some lowering springs From RS-2 for my M37X. The company is base in Japan, but now has a US office. If you look on the us site you will not see them available. After researching and finding the Japanese equivalent (Nissan Fuga 370gt awd or KNY51) I was able to see the company did make them for this car. I reached out to http://www.rs-r.com/ and someone their was able to assist. Since they isn't a high demand, they do not have them on stock in the US, so i have to pay for shipping..and this what i got back from them...i will keep you guys posted and post pictures once i am done with my MODs


Thank you for your patience. The part# you will need for your 2011 Infiniti M37X is N282D. These springs will be $309.00 + shipping.
RS-R Down Sus Springs - 2009+ Infiniti M37x
Part#: N282D
Price: $309.00 USD
Compatibility:
2009+ Infiniti M37x
Chassis code: KNY51

Approximate Drop:
Front -40mm to -45mm (-1.6inch to -1.8inch)
Rear -30mm to -35mm (-1.2inch to -1.4inch)

Spring Rates:
Front 7.34kg/mm
Rear 2.70kg/mm
Part# N282D is not an item that we usually keep in stock in the U.S., however, it is available to order and will ship out from Japan.

There will be two shipping methods available for you. The fastest way will be to air freight the package direct to your residence. Within the continental U.S., this will take approximately 7-10 business days and the charge will be $140.00 USD.

The second option is via boat freight to our warehouse here in the U.S. then shipped out to your residence via UPS Ground. This will take approximately 6-8 weeks, but the only shipping charge will be for the UPS Ground service.

Seems like a weak drop :S

Arent Eibachs pretty much the same?

Nope, Eibach is 1.2 in front and 0.8 in the back....

[Durty504]

Here is a link to the Tein products as well, pretty much the same as the Rs-r as far as the springs


http://www.tein.com/srch/us_search.php? ... em=default

[LeRoy712]

Here is a link to the Tein products as well, pretty much the same as the Rs-r as far as the springs


http://www.tein.com/srch/us_search.php? ... em=default

What made you pull the trigger on the RS-R vs the Tein springs? I have just read so much good stuff about the RS-R down springs on other Infiniti's not to mention other luxury brand cars that I think I'm willing to bite the bullet and spend the extra $140 for shipping. Plus I was browsing around a Lexus forum and a "suspension" specialist that had his own shop was talking about how RS-R down springs are built far superior to the Tein H-techs due to the materials they use. Supposedly the Teins are Japanese designed but built in Taiwan while the RS-R's are designed and built in Japan with better materials. I'm not sure if that's the gospel or not, but it seems legit.

[Debonair]

I look forward to seeing some pics.

[Durty504]

Rs-r makes them for the X....Not able to fine them in the Teins

[wideopn11]

Check my how to thread where I installed the eibachs how-to-2011-m37x-eibach-install-diy-t576774.html; I have before and after pics. I'm really happy with them overall. I got them pretty cheap and installed myself so good bang for your buck. I am however considering doing coilovers now that I've done exhaust and brake upgrade but it's not a rush.

[mig0s]

I look forward to seeing some pics.

X2 please post pics after you installed them

[DoN_BLaZe34]

For any AWD guys looking I still have a set of RS-R springs for sale.