[3LiterBeater]

As the title states, I was not thrilled with the options offered for coilovers on the OG car. I've previously experienced the XTA and was extremely pleased with it so, I whipped out the caliper and started measuring.

I also called ST, who said "this is not designed for this car and will not fit".

ST was kind enough to include a hole for our strut brace on the camber plate (same as the $5,000 KW Clubsport series) as well as the carbon brace for the S55 cars.

To put it briefly, the ride is incredibly similar to stock but with much more poise. NVH is marginally increased. Testing on track at the end of the month and will report back.

So far, it's proving to be the best dual-purpose coilover I've ever experienced out of my 9 or so sets on various cars over the years.

10/10 would recommend to anyone looking for a "budget" coilover/ camber plate combo.

[AUSf22]

Great job! I had ST's on my f22 and they were an amazing coilover.

That's definitely great value for money for the F87 platform as it comes with the camber plates as well.

What height settings are you dialed in at right now? the heights look perfect.

[3LiterBeater]

Originally Posted by AUSf22

Great job! I had ST's on my f22 and they were an amazing coilover.

That's definitely great value for money for the F87 platform as it comes with the camber plates as well.

What height settings are you dialed in at right now? the heights look perfect.

Thank you! So I took the OEM measurement from the center of the wheel to the top of the fender.

372mm front
365mm rear

Decided to start with a 1in drop so measured a 25mm drop from stock height. Final was roughly

347mm front
340mm rear

I'm astonished with how well these ride. I even set them to what I'd use on track and cannot believe how comfortable they are

[Matt Devo]

Originally Posted by 3LiterBeater

As the title states, I was not thrilled with the options offered for coilovers on the OG car. I've previously experienced the XTA and was extremely pleased with it so, I whipped out the caliper and started measuring.

I also called ST, who said "this is not designed for this car and will not fit".

ST was kind enough to include a hole for our strut brace on the camber plate (same as the $5,000 KW Clubsport series) as well as the carbon brace for the S55 cars.

To put it briefly, the ride is incredibly similar to stock but with much more poise. NVH is marginally increased. Testing on track at the end of the month and will report back.

So far, it's proving to be the best dual-purpose coilover I've ever experienced out of my 9 or so sets on various cars over the years.

10/10 would recommend to anyone looking for a "budget" coilover/ camber plate combo.

so these work OOTB w/o modification?

what's the ST part # you used?

TIA

[243Racing]

Originally Posted by 3LiterBeater

Thank you! So I took the OEM measurement from the center of the wheel to the top of the fender.

372mm front
365mm rear

Decided to start with a 1in drop so measured a 25mm drop from stock height. Final was roughly

347mm front
340mm rear

I'm astonished with how well these ride. I even set them to what I'd use on track and cannot believe how comfortable they are

Subscribed for track report. I'm thinking about getting these with some more aggressive springs.

[3LiterBeater]

Originally Posted by Matt Devo

so these work OOTB w/o modification?

what's the ST part # you used?

TIA

Correct! PN 182208AN

[ROBM2C]

So KW makes the XTAs ?

https://www.kwsuspensions.net/produc...overs/182208AN

[243Racing]

Originally Posted by ROBM2C

So KW makes the XTAs ?

https://www.kwsuspensions.net/produc...overs/182208AN

Correct. ST is a sub-brand of KW.

[AlpinewhiteM2C]

What are the spring rates that comes with standard with the kit? Linear or progressive?

[Bee Pee]

Originally Posted by AlpinewhiteM2C

What are the spring rates that comes with standard with the kit? Linear or progressive?

Read the part certs PDF from within the link in post #7 above - it may have info you're after...

http://docs.kwsuspension.de/ga-STXTA-208AN_1213-19.pdf

[AlpinewhiteM2C]

Originally Posted by Bee Pee

Read the part certs PDF from within the link in post #7 above - it may have info you're after...

http://docs.kwsuspension.de/ga-STXTA-208AN_1213-19.pdf

Thanks for the link @Bee Pee. Front and rear springs are linear, but can't find info on actual spring rates.

[Bee Pee]

Originally Posted by AlpinewhiteM2C

Thanks for the link @Bee Pee. Front and rear springs are linear, but can't find info on actual spring rates.

Assuming ST spring markings are the same as KW....

On the spring you will see two numbers. The first is the newton/mm rate and the second is the mm length or height of the spring. From TUV cert ST linear main spring rates/heights are

Front: - 50 newtons/mm (*285lb/in) and height @ 200mm/8".

Rear : - 120 newtons/mm (*685lb/in) and height @ 200mm/8".

* - To convert newtons/mm to lbs/in. multiply the newtons/mm by 5.7.

HTH, BP

[243Racing]

Originally Posted by Bee Pee

Assuming ST spring markings are the same as KW....

On the spring you will see two numbers. The first is the newton/mm rate and the second is the mm length or height of the spring. From TUV cert ST linera main spring rates/heights are

Front: - 50 newtons/mm (*285lb/in) and height @ 200mm/8".

Rear : - 120 newtons/mm (*685lb/in) and height @ 200mm/8".

* - To convert newtons/mm to lbs/in. multiply the newtons/mm by 5.7.

HTH, BP

That's interesting. For comparison, the Swift F82 springs I'm running are 280 Front 727 Rear

[-Eidos]

In your research about the available options, what turned you off from the TC Klines since the kit comes with coils and camber plates?

[243Racing]

Originally Posted by -Eidos

In your research about the available options, what turned you off from the TC Klines since the kit comes with coils and camber plates?

Don't mean to speak for OP, but these being half the price of the TC's is probably a factor.

[AlpinewhiteM2C]

Originally Posted by Bee Pee

Assuming ST spring markings are the same as KW....

On the spring you will see two numbers. The first is the newton/mm rate and the second is the mm length or height of the spring. From TUV cert ST linera main spring rates/heights are

Front: - 50 newtons/mm (*285lb/in) and height @ 200mm/8".

Rear : - 120 newtons/mm (*685lb/in) and height @ 200mm/8".

* - To convert newtons/mm to lbs/in. multiply the newtons/mm by 5.7.

HTH, BP

Thank you for interpreting. Spring rates are in line with what TC Kline also recommends for street set up (300 front/ 700 rear). Added bonus is springs are linear as oppose to progressive rear versus the KW HAS kit.

[AlpinewhiteM2C]

Originally Posted by BeastieBombRacing

Don't mean to speak for OP, but these being half the price of the TC's is probably a factor.

I've also been researching to see what coilovers to get should I pull the trigger later this year. TC Kline is on the top of my list due to 1) I buy into TC Kline philosophy of running softer springs and leaning more on dampening characteristics to fine tune 2) kit has linear, cylinder type springs all around as oppose to others like KW V3, M Performance, and Ohlins that uses conical springs up front which reduces precious wheel clearance on our cars, and 3) kit comes with camber plates. After coming across this thread, the ST XTAs peaked my interest as 1) I'm being honest with myself and I know I will not come close to reaching full benefits of TC Kline or Ohlins which is my second choice based on usage in my previous cars 2) i have typically not touched the setting on my coilovers once I find the ride height and dampening settings I felt comfortable with, and 3) aside from some autocross and 2-3 HPDEs, my M2 is not a all out track car. The price of the KW HAS + camber plates are pretty close to the price of the ST XTA kit making it a compelling choice for half the price of the TC Klines. It's like getting adjustable dampers for free. if the dampers are any better than stock, than that's an added bonus. Now looking to gather data if the ST XTAs coupled with front swaybar I already have and better tires could make for a decent daily driver set up that can handle occasional autox/ HPDE duties.

[omasou]

Originally Posted by 3LiterBeater

Thank you! So I took the OEM measurement from the center of the wheel to the top of the fender.

372mm front
365mm rear

Decided to start with a 1in drop so measured a 25mm drop from stock height. Final was roughly

347mm front
340mm rear

I'm astonished with how well these ride. I even set them to what I'd use on track and cannot believe how comfortable they are

Are those measurements correct? Stock should be somewhere closer to 625 mm / 614 mm

EDIT: oh you measured from center instead of bottom of rim.

[FaRKle!]

Originally Posted by AlpinewhiteM2C

Ohlins that uses conical springs up front which reduces precious wheel clearance on our cars,

Ohlins uses standard 2.5"/65mm ID coilover springs front and rear.

[243Racing]

Originally Posted by FaRKle!

Ohlins uses standard 2.5"/65mm ID coilover springs front and rear.

I don't know this to not be true, but Apex specifically lists Ohlins R&T as limiting inner clearance due to the coil size

[3LiterBeater]

Originally Posted by BeastieBombRacing

I don't know this to not be true, but Apex specifically lists Ohlins R&T as limiting inner clearance due to the coil size

Just to confirm, these coils will reduce inner clearance on the front. IIRC they're about 4mm closer to the tire than the OEM strut. This is basically unavoidable with any quality coilover.

That said, based on my measuring, I can still run the OEM front wheel with a 255/35/19 without issue. I tossed a 5mm spacer on for aesthetics.

[3LiterBeater]

Originally Posted by -Eidos

In your research about the available options, what turned you off from the TC Klines since the kit comes with coils and camber plates?

I wanted to remain under $1500 as I have some big repair dollars going into my other project car.

I was also disappointed by the fact that the "better" M3/4 had access to cheaper yet high quality coils than we did. After combing through part numbers, I didn't see why this wouldn't fit. To me, it made total sense.