17

Project Evo X GSR, Completing the Suspension with Whiteline

by Mike Kojima

It's been a long time between updates on Project Evo X GSR.  It hasn't been for lack of trying, the car has been through a couple of different owners and it's been hard to catch up with it.  Well we have caught up with it at last and it's time for some long awaited parts to go in.

It's a good thing too, Whiteline has come out with some new parts for the Evo X in the meanwhile.  When the project was more active, the only parts available were swaybars but since then they have come out with a roll center and bump steer correction kit, a kit to reduce front lift and add positive caster, an adjustable camber link and a full bushing set. 

Now that a full gamut of parts are available it was time to get to work, install and evaluate them.

 

The stock Evo X anti sway bar diameter is 25mm.  The Whiteline bar is 27mm in diameter, which equates to a 36% increase in stiffness just from the increase in diameter.  The shape is also stricter which results in another increase.  The Whiteline bar is 3 way adjustable and at the stiffest position will result in a further 50% increase in stiffness (part number BMF55Z).   

The Whiteline bar has the potential to be up to 100% or more stiffer than stock.  The Whitline bar sits in hard urethane bushings for a more direct coupling as well compared to the stock soft rubber parts.

 

The Whiteline rear bar is 27mm in diameter, up from the stock 23mm diameter. This equates to a 90% increase in stiffness due to the diameter change.  If you put the bar in the stiffest of the three positions, the increase in stiffness can be about 150% greater than stock (part number BMR84Z).  

The bar sits in urethane bushings and has clamp on collars to prevent it from moving back and forth in the chassis.  We really feel that adjustable bars are important for a car that sees track duty.  It is easy for a one person pit crew to adjust the sway bars to tune the car's balance but nearly impossible for one person to change springs to tune the chassis and still see some track time!

 

The Whiteline camber/toe arm (part number KTA135) replaces the stock lower lateral link and gives a lot more leeway in adjusting both the camber and toe settings.  It has sealed spherical bearings instead of soft rubber bushings in the ends so there's no mush that can impact the suspension geometry under load.
The Whiteline Roll Center/Bump Steer kit (part number KCA395) is an important part for a lowered car. When a car is lowered, the roll center or the geometric point in space that the front of the car rolls about drops faster than the car's ride height. This increases the roll couple or the distance between the car's center of gravity and the roll center.  This gives lateral forces in cornering a longer lever arm to roll the car over. 

By lowering the outer pivot point of the lower control arm, the roll center location can be returned to close to the stock position and the roll couple length, kept about the same as stock. Relocating the outer pivot point position can also give a more favorable camber curve by reducing the tendency for the camber to become more positive under roll that lowered McPherson struts can exhibit. The Whiteline roll center correction kit has a ball joint with a longer shank to effectively lower the pivot point with no fabrication. 

When lowering the lower control arm lower pivot point the tie rod end must also be lowered or you could develop a large amount of bump steer.  The Whiteline kit also has tie rods with longer shanks to lower the tie rods by the correct amount to keep excessive bump steer at bay.

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Comments
rjnovak05
rjnovak05link
Monday, April 18, 2016 9:19 AM
Word of advice: the Whiteline ball joint boots like to tear. I replaced them with the OEM boots, which have held up for about 20k miles since swapping to the Whiteline RCA ket.
MDR
MDRlink
Monday, April 18, 2016 9:52 AM
H&R sway bars have ptfe lined bushings. I have their front bar on my E36 M3, 2 years so far of no maintenance and no squeaks.

http://www.hrsprings.com/products/sway-bars/
Mike Kojima
Mike Kojimalink
Monday, April 18, 2016 10:01 AM
Those are nice looking bars!
cartechs
cartechslink
Monday, April 18, 2016 11:24 AM
Hey MotoIQ staff.... As much as I love this site, the project vehicles are lacking diversity, going the lazy route...What I mean is, they all get KW suspension, Whiteline chassis, and Rays/Volk wheels. Same old story over and over.(OK not every single project, but you know what i mean). Sure those companies are paying supports of the site and I thank them for keeping it free for me...But can you change the recipe around a bit once in a while? Not trying to be a dick at all, just saying, there is a whole world of modification options out there. Lets take a look. The motoiq staff is the most qualified to do it.
Mike Kojima
Mike Kojimalink
Monday, April 18, 2016 11:49 AM
Because for two reasons, one is application range, next is performance for dollars spent. Whiteline and KW usually have a top quality applications for the car in question that we are going to build. KW has the widest range of coil over applications of any manufacturer. Especially in the high end street/track market that a lot of our project cars fall into. Same with Whiteline, they have the widest application range of any bar manufacture. Whiteline is one of the few companies that have geometry correcting parts for many cars as well. In the past year we have had two different cars using HKS coilovers, one with Tien, one with Fortune Auto and another Fortune Auto suspension story coming soon. Look for future stories with Eibach coilovers and swaybars. We also use Progress Automotive bars and Superpro bushings and bars if you read our stories. Probably on 3 project cars this year. When we plan our stories believe it or not we first try to find companies other than KW or Whiteline and we often end up using them because of applications in the performance range we want that on one else has.
Option13
Option13link
Monday, April 18, 2016 2:58 PM
I've never paid for the content, which puts a relative value on my opinion...

I have to admit that I have stopped visiting as often because so many of the articles are simply installs of the same ARBs, shocks, and geometry correction bits on various new cars. The before and after comparison is limited to a few comments at the end of the article. I'd love to see some numerical comparisons like from the SCC days.

I know good content takes a lot of time, but I'd love to see more content on theory and modifications applicable to all vehicles, not just one platform. Wrench Tips, crazy projects, and old cars that need baselining and other upgrades to bring them up to modern standards. The Isuzu, Miata, CRX, R32 GT-R, MiataBusa/StarletBusa, Legacy GT are great examples. Hell, even the Viper has a lot of updates and ideas I can apply to my own car. And I'm seeing more of these projects lately.
Mike Kojima
Mike Kojimalink
Monday, April 18, 2016 3:14 PM
When the alternative to having a track worthy suspension is custom $7000 race shocks and fabricated parts, or crappy asian coilovers, or single adjustable street coilovers, we will use whats available off the shelf every time.
czubaka
czubakalink
Tuesday, April 19, 2016 7:34 AM
I certainly agree with the off the shelf philosophy, especially when the parts are of such high quality. No need to re-invent the (Rays) wheel.

Speaking of crappy stuff, I've heard there are cheaper dampers with surprisingly good build quality, just not well tuned for the given application. I'm curious to know if there are recommended shops that specialize in revalving these Taiwanese dampers, and how to properly communicate your needs/goals to them.

For example, I have a 14 Civic Si sedan. There's not much on the shelf for 9th gen civics, and even less so for the 14+ due to some mounting change. My options seem to be really cheap, questionably tuned coilovers, or really expensive custom options.

Maybe an article to cover these types of issues, when no suitable off the shelf option exists, would be helpful...to me at least. Oh, and I'm not volunteering myself. Unless everyone wants to suffer through my ignorance.
Mike Kojima
Mike Kojimalink
Tuesday, April 19, 2016 11:02 AM
Odi Bakchis at Feals Suspension does a great job of revalving some of the low cost but improperly damped coilovers. We are planning to do a story with him eventually but haven't had the right car with crappy coilovers to work with him on. Odi also does a great job on revalving stock shocks on some cars where it is possible like the WRX and STI. Our Feals story was going to be something like trying to make a K Sport coilover work on a Sentra SE-R that has no aftermarket support.
warmmilk
warmmilklink
Wednesday, April 20, 2016 1:19 PM
so not that I have anything against KW, but you make it sound like its the only quality option out there in that price range. That may have been the case back when you could get V3's for most applications in the sub 2k range, but now most are a lot closer to 3k, even more for Clubsports which MotoIQ puts on a lot of their cars. That puts a few more options on the table of equal or better quality coilovers available from Ohlins, MCS, Nitron, some of the lower end JRZ stuff... maybe some others I'm not thinking of...

I always thought you guys used KW on most of your projects because MotoIQ is sponsored by them and/or work closely with them in FD and stuff. Not cause its the only option unless you wanna step up to $7k motorsport dampers.
Mike Kojima
Mike Kojimalink
Wednesday, April 20, 2016 1:56 PM
Those are all great companies, but all of those companies have limited applications or are MTO, the shocks in the same price range are mostly single instead of double adjustable or the companies don't want to work with us. Our BMW race car is getting some MCS double adjustable shocks soon and if any other reputable brand wants to work with us we are down for that. I do want to revisit some of the cheaper price point coilovers soon like Stance and BC to see if they have improved. We had bad experiences with them around 5 years ago but they seem to have made inroads lately. At some point we are going to have Feal Suspension revalve some cheaper coilovers to see what their potential might be.
warmmilk
warmmilklink
Wednesday, April 20, 2016 2:30 PM
ok, so my understanding was correct, plus double adjustable vs single.

What's MTO?
czubaka
czubakalink
Wednesday, April 20, 2016 2:40 PM
made to order
mike156
mike156link
Wednesday, April 27, 2016 4:41 PM
FWIW, the Whiteline RCK does bumpsteer correction too, not just roll center height. On the VIII/IX stuff anyway, it only changes the roll height like 1/4" but between the RCK, PSRS (with caster offset) and precision steering kit (PSK), it changes the toe curve from toeing substantially in under compression to only toeing in a little bit. The PSK raises the rack about .080" if I recall correctly. Might not be legal if building for a street class though.
timmiii
timmiiilink
Monday, May 02, 2016 8:12 AM
Great article.

What front top mount plates are you using on this particular project? I would love to add as much caster on my Evo 9.

Thanks
Mike Kojima
Mike Kojimalink
Monday, May 02, 2016 9:48 AM
timmill, the top plates are standard KW Clubsport. If you wanted even more caster you can get Racecomp Engineerings camber plates which add another degree of caster.
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