Before I start this review, I just want to make it clear that this is not an advertisement, and that sales of this kit don't benefit me in any way. I'm not part of SADFab and I purchased the kit on my own.
To start things off, I've had Energy Suspension bushings in the car for years. I always thought they were great compared to the failing rubber bushings. When I first installed them, I could move the control arms with relative ease and the compliance was much less than the factory rubber bushings. But, after reading through The Bushing Megathread
, I thought that some of the points brought up were valid and decided to go for one of the SADFab delrin kits.
I ordered the NASA legal kit which is a zero points modification in TT and PT, and I also added on the Front Lower Control Arm Offset Bushings in order to get stancenation levels of camber. The NASA kit does not include the rear upper outer spherical bearing portion of their normal full kit.
Here's what the kit came with:
- Delrin Bushings for the following locations:
- - FLCA Forward Bushing (Offset + Set Screws)
- - FUCA-I bushings
- - RLCA-I Forward Bushing
- - RLCA-O bushings
- - RUCA-I bushings
- Poly bushings and bronze bearings for the following locations (see Bushing Megathread to find out why):
- - FLCA Aft bushing
- - RLCA Aft bushing
- - RUCA-O bushing
- Grease fittings for all locations
The first thing I noticed when taking the control arms off my car, was that I could not move them by hand anymore unless I put some serious force into it. To get the hub to move was probably 100+lbs of force to move them with the coilovers and sway bars disconnected. I did not have grease fittings installed, nor have I ever taken them apart to grease them, this is likely a huge contributing factor to that but whatever.
I took all the arms off, and headed over to Sean's place (hi_im_sean), who makes these kits. He has a press and was kind enough to help me get everything installed.
Next thing Sean and I noticed is that the bushing thrust faces were starting to chew themselves up, the sleeves had scoring on them, the plating had been worn off and the Energy Suspension grease had turned into almost an adhesive now that dirt and dust had been mixed in. A shop press was required to get most of them out.
After that, it's lots of cleaning, new grease, press bushings in, drill holes for grease zerks and for the offset set screws, etc etc. It's your typical bushing install aside from having to ream out the delrin bushings before putting in the sleeves. Everything was pretty straight forward.
After that was done, I just had to put all the arms back on the car, get an alignment and corner balance redone and hit the track. Luckily I had two track events on the same course, in about the same weather conditions only two weeks apart so I got to do some really good back to back comparison.
When the arms went back on, they move by hand with ease. The resistance is maybe 5% of what it was before with the poly bushings. Massive improvement.
I firmly believe this kit is worth purchasing and installing. I'm happy with my purchase and the results I've gotten with it.
First, I'm sure some of you are interested in how much front camber I was able to gain with the offset bushings. The answer is a lot. The middle of the adjustment range was about -3.5 degrees with 4.0" front and 4.25" rear pinch weld heights with brand new, zero heat cycle 205/50R15 Hoosier R7's on 15x9" Advanti S1's.
The adjustment range looks to be about -3.0 to -4.2 in the front at that ride height. Perfect for track oriented cars.
-- The car is now ******* telepathic. It just feels much more connected to the road, and communicates through the steering wheel better.
-- The car now feels tighter and more solid.
-- It feels like the suspension is doing a better job now that it is not fighting the resistance of the poly bushings. Handled bumps and irregularities much better.
-- NVH did not really change for me, but my car is a purpose built race car and NVH is already abysmal, so take that with a grain of salt. Me personally, I would still not hesitate to put these on a street car.
Track Test Results:
Below, are pictures of two time sheets, before and after. The track is Wild Horse Pass East in Arizona. Those are the best laps out of each two day track event that I attended. The events were only two weeks apart. I'm usually a very consistent driver, the weather was nearly the same, and the car didn't have any massive changes.
Both events were done on Xida Gen 2 with Billet Coaxial Mounts.
Both events had no changes to power. The car makes 133WHP and 113WTQ on a dynojet.
2405lbs coming off track
6 Heat Cycle 205/50R15 Hoosier R7
-2.4 Front Camber
-3.0 Rear Camber
0 Toe All Around
2460lbs coming off track (+55lbs!)
0 Heat Cycle 205/50R15 Hoosier R7
-4.0 Front Camber
-3.9 Rear Camber
0 Toe All Around
As you can see, I went about 1.1 seconds faster with the SADFab delrin bushing kit. I also was able to break the long standing TTE record, set three years ago, by 1.3 seconds. The newer tires probably helped a bit, but take into consideration that during the faster run I was 55 pounds heavier as well. I had to ballast up a little bit for my new classing. Also, the way more aggressive alignment that I was able to achieve, as a direct result of the delrin bushing kit, helped a lot as well. Also being on a fresh corner balance and alignment was helpful too but I believe the delrin bushing kit played a large factor in being able to set that track record and my new personal best at that track.
Also, I've even got video from the two events. The first two videos are races from that weekend, I set the fast time in open qualifying that morning but no video of that. But the third video has the delrin fast lap in it.
SADFab Delrin Bushings:
If you read this far, thank you. Hopefully this helps anyone looking for more information on this product. If anyone has any questions, feel free to ask and I'll try to answer as best I can.
And a couple pictures from the Delrin weekend because why not.