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Posted by llxkevinxll, Feb 19, 2013
DSM Build Journals - Start a Journal to document your DSM build and document race events, dyno days, etc for the car.
UPDATE #25 - 3/28/2017 - Lower radiator hose, rear upper control arms, vented valve cover.
The lower radiator hose on the car was old and brittle. I replaced it with a new HPS hose but it was in the way of the shift linkage counter weight. I modified the routing with an aluminum bend and tucked it up against the front roll stop as much as possible. I also covered it in DEI cool tape to prevent any additional heat from the block, manifold, or turbo.
I have also continued work on the vented valve cover and breather hoses.
I will also be installing adjustable rear upper control arms. The old bushings were stuck as expected so they will be replaced with prothanes since they have to come out anyway.
The battery is also fully installed now.
UPDATE #26 - 4/11/2017 - Rear upper control arms, catch can install, interior re-install, downpipe wrap.
Rear upper control arms are installed and the car has been aligned.
Catch can is installed and plumbed.
The interior is back in the car after being removed for the battery relocation.
Wrapped the downpipe for good measure as well.
Car is ready for autocross events and the next major step is to work on the tune.
Why stick with the GM MAF when you're already wired for speed density?
I do not have a good answer for that actually. I am more comfortable with MAF tuning but that isn't a very good reason. As far as the car sits now, I am nowhere near maxing out the MAF or at the point where the MAF would be limiting horsepower in any way so I am sticking with it for now. If it becomes a nuisance I will switch over.
How did you find the install on the arms? Any feedback at all will be appriciated so i know if i need to look into issues or easy of folks using them for future,
I know the poly bushes are tight but it does fit , based around an oem bush so it had some space left for this.
Hope you like and enjoy them. If you have any questions i am here to answer.
Great work on the car aswell mate, keep it up
The arms went on super easy. No issues at all. They look great and were able to get rid of my negative camber from the lowering of the car. Went from about -2.5 on both sides to right around -1.3 with some adjustment left. It fit fine with the prothane bushings no issues there. Thanks for your work on them.
My only note would be when installing the 4 bolts that hold the arms to the body brackets, put the bolt heads towards the spring. I did this to ensure as much clearance as possible to the spring allowing easier access to hold the bolts steady while tightening the nuts and to be as safe as possible when the spring is going through compression strokes. Probably not a big deal but something I considered when installing them.
Im glad they went on ok for you and the install was easy, that was my plan to make it as easy as possible for all,
As for the bolts i tried both ways and mine wont go in from the spring side since my coil is in the way at the hole i have used, thats why i went from the other side and honestly it wont hit the spring, i checked it with stock shocks and under a bit of compression that i could get and its very much clear of any hitting, since all spring sizes will be different its going to be what ever folks are happy with per setup, i have no hitting aswell just for note
If your lowered did you not want to use any of the upper holes to make your arms motion with less camber under cornering/compression? Means more tire on the road and more grip overall.
If you have driven on them yet let me know how you like the drive with them on
I had a similar issue so I had to rotate the spring to give myself a gap to get them in. I agree there is no way for them to hit either direction of installation.
I wanted to use OEM for the roll center to start as the car has a handful of points of adjustment now and I had not dialed in any of them. I wanted to keep as many "controls" as possible so I can gauge how the car reacts to variables. I will absolutely be making use of the roll center holes once the other settings are to my liking. The first autocross I will be going to is tomorrow so I will start to get a feel for the alignment changes then.
Quick video of the car on the road for the first time this year after the winter modifications.
The car is still on a conservative tune with essentially factory timing and only 15 psi (gate pressure) on the 20g.
That makes sense feel for it then adjust to suit, i wish you luck for tomorrow, keep me updated on how you got on and how the arms felt for you on the tight turns of autoX.
Have you done many miles since the install with any cornering involved? I hope you and all like them as much as i do,
Some back roads and a few freeway entrance/exit ramps but nothing too aggressive yet. Tomorrow is the first real test. I expect them to handle just fine. The biggest difference is the rear camber being brought closer to 0. The -2.5 degrees led to some interesting behavior when hitting bumps or transitioning on and off throttle/braking.
I dont know the best settings for autoX but for slower runs and quick turns i can imagine alot of camber is abit excessive, i have never autoX as we dont have these events here,
I think you will go up a hole over time and feel it be more flatter on the rear end, i found my grip increase more due to the arms not causing camber or more then it does upon movement and keeping more tire on contact with the road.
I look forward to seeing your results and feedback from the event
The event went very well. The car handled as good as it could have. No odd understeer or oversteer. Felt planted and reacted quickly when it needed to. Overall I am very happy with how the car has come along. The tune needs some refinement but the high compression works very well in the autocross environment.