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Project DC2 Integra: Truing up the Suspension with Whiteline

by Mike Kojima

 

In the last edition of Project DC2, we greatly improved our car's suspension by replacing the ancient worn out Koni Yellow shocks with some state of the art street KW Suspension Double Adjustable Variant III coil-overs. When paired with a stock front anti-sway bar and the excellent Comptech rear anti-sway bar that came with the car, we had a well-balanced combination that worked pretty well on the track and the street.  

All was good, but we wanted to go through the entire suspension and replace all of the old and well-worn rubber bushings in the car with new, hard polyurethane parts from Whiteline. This would bring our suspension up to snuff with the current best stuff out there. 

The hard urethane bushings would hold our alignment true even under hard cornering and braking loads anticipated from our upcoming wheel and tire upgrades. They also greatly improve response to steering input by eliminating flex. 

Read More About Project DC2 Integra!

 

Starting with the rear suspension, the Whiteline Rear Lateral Arm Bushing replaces the bushing at the very front of the rear lower trailing arm. Lower compliance in this bushing helps control the rear toe.

Like all of the Whiteline bushings, this bushing comes with Whiteline's special urethane bushing specific grease which eliminates squeaking and sticksion.

 

The Whiteline Rear Lower Control Arm Bushings replace the inner, outer and shock bushings on the lower control arm. 

Reducing flex and compliance in these bushings helps to controls toe and camber under side load and braking. The harder shock bushings also get more of the suspension motion under control of the damper. This improves both shock control and ride comfort. 

The two piece construction helps make installation of the bushings a lot easier with no need for a hydraulic press.  

 

The design of the Rear Trailing Arm Lower Front Bushing is super critical when designing a performance part with less flex.

This bushing needs to be stiff in the up and down and axial plane but have radial stiffness to control toe under side and braking loads. Some companies have solid bushings, but these cause severe bind, locking up the suspension and causing oversteer as well as a bad ride.

Whiteline's part has controlled compliance with 4 windows in the urethane to allow the suspension to articulate with a solid ring center to keep the alignment under control. This is one of the best bushing designs we have seen for the trailing arm.  

Previously, we have only recommended the OEM bushing in this location, but the Whiteline part should work well. 

 

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Comments
rjnovak05
rjnovak05link
Monday, September 18, 2017 10:07 AM
This takes me back. I destroyed a 12 Ton Harbor Freight press installing an Energy master bushing set in my DB8 haha. You can also make essentially the same thing as the Whiteline front caster kit for a fraction of the price. Setup took me a little longer as the washers were less precise than Whiteline's shims.
Mike Kojima
Mike Kojimalink
Monday, September 18, 2017 11:50 AM
Did you notice the binding that the early Energy trailing arm bushings caused? Hello sudden oversteer!
ED9man
ED9manlink
Monday, September 18, 2017 3:54 PM
Are those just little self tapping screws for the third point of the tower brace? Seems like this would be good use of some nice M8 rivnuts. Also, definitely interested to hear what sort of lifespan you see with the poly bushings. Here in New England with a car used year round, 12-18 months is about the best you can hope for from my experience!
warmmilk
warmmilklink
Monday, September 18, 2017 5:33 PM
@ED9man
My sister had a few Whiteline bushings in her STi for about 140k and 7 years without issue (then sold the car). I have SuperPro in my RSX track car (now my sister's) for 3 years now without issue. I have SuperPro bushings in my Miata track car for 2 years now with no issue.
Longevity with poly bushings is very much dependent on how well the grease is retained. This is why most (if not all) Whiteline and SuperPro bushings have knurling on them. If you get Energy Suspension or any other non-knurled poly bushings, make sure to scratch them up on the surface thats greased so it holds grease in better/longer. Or add zerk fittings where possible and lube them up periodically. Don't over lube though, if you stuff enough lube in there to cause the bushing to lose its shape, you'll kill that quick as well
Mike Kojima
Mike Kojimalink
Monday, September 18, 2017 6:02 PM
Or do our teflon tape trick.
warmmilk
warmmilklink
Monday, September 18, 2017 6:23 PM
doesn't that only work on swaybars?
Mike Kojima
Mike Kojimalink
Tuesday, September 19, 2017 8:53 AM
If you have been reading at least the stuff on my cars, it works on everything.
Mike Kojima
Mike Kojimalink
Tuesday, September 19, 2017 8:55 AM
One thing I noticed is that Whiteline bushings seem to last longer than Energy. So far I have yet to wear out a Whiteline bushing but have to replace Energy after 2-3 years of continuous use in parts that get worked hard, like flexed in 2-3 directions.
importnut
importnutlink
Tuesday, September 19, 2017 9:32 AM
Mike, I'm really glad to see that you installed the caster adjustment shims. I've been contemplating this upgrade on my EG. I'm confused. You mentioned that the kit adds 1.5* caster and now there is 4*. Stock, the EG/DC chassis has virtually no caster.

Looking at pictures of my EG during autocrosses, I can clearly see where extra caster would benefit the inside tire. Would you recommend more than 4*? Thanks for your input.
Mike Kojima
Mike Kojimalink
Tuesday, September 19, 2017 11:17 AM
For FWD cars, generally, I don't like to run more 4 degrees because it can contribute to torque steer. A lot of this depends on other factors though so it's not a hard and fast rule. The Spoon Time Attack car, for instance, runs plus 8 degrees positive caster for instance.
sobe_death
sobe_deathlink
Tuesday, September 19, 2017 1:07 PM
I'm interested to see how the Whiteline rear trailing arm bushing lasts. Last time I had a Honda with trailing arms, the only aftermarket solution that was worth anything were the various large spherical bearing options.
presterone
presteronelink
Thursday, October 26, 2017 7:02 PM
Mike,

Where did you get these whiteline rear trailing arm bushings?, I've been through two vendors that both showed that they sold these exact bushings, and had them in stock and shortly after ordering I get an E-mail back saying they are unavailable or the can't "find them in the warehouse"

Are these discontinued or something maybe I'm just not looking in the right places.
Mike Kojima
Mike Kojimalink
Sunday, October 29, 2017 9:02 PM
They should be avalibe, look on the Whiteline.au site.
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