I just ordered another set of Kinetix arms to aggressively modify. I'm sitting at 2,75 with the I arms I hacked with a grinder, but one of the Z drivers I autocross with is a mechanical engineer and he's putting his expertise to work on those new arms tomorrow.

I will post the results of that endeavor tomorrow.

 

i was able to get up to almost 4 deg with my arms cut on a saw, but interested to see what you come up with anyway. whats your ride height look like up front? You can get some more static camber if u go lower

 

Ended up with 3.5 up front. Could have gone to ~3.8.

Pics of the arms here (and ride height):

https://my350z.com/forum/autocross-r...u-build-8.html

 

To be honest, I deferred to Z1 on this topic and they told me their control arms are class legal (hopefully they weren't just trying to make a sale). I decided to go with these over the Kinetix just to do something different, for science! As of right now I am still going to run STU (only racing regional).

 

After more research and reading of the rules I believe the street version from Z1 is perfectly legal! I believe I'm going to buy a set of these as well.

What sort of front camber numbers were you able to achieve with the Z1 arms?

Did you modify them like others are doing the Kinetix arms?

 

I was able to achieve -2.7 and -2.6 up front with a modest drop and the arms maxed out (full alignment sheet has been added to my original post); I did not modify them at all. I went with a more conservative setup because I like to drive the car to work and around when it's nice out, and also typically have at least an hour drive to autocross events.

 

I'm a bit late updating this, but events 1 and 2 for the 2016 autocross year are in the bag! I am basically driving a brand new car this year between the new suspension setup and the tune and will say I am very happy how the car feels. Handling is very balanced and easy to control while an increase in power is apparent. I now need to become much more smooth with my throttle inputs as well as my steering inputs. Below are the details of the first two events.

Location: Williamsport Regional Airport, Montoursville, PA
Race surface: A mix of asphalt and concrete; note the concrete was noticeably more grippy than the asphalt and was the "fast" portion of the course

Event 1
04-23-16
Weather: It was a partly cloudy and cool day after a night of rain. The high was 61 degrees however it never really felt it due to a constant breeze.
Results: 2nd in STU, 41oo75 raw, 42oo75 PAX
Times:41.732+dnf
40.789+1
41.318
41.336
38.949+dnf
41.426
41.987+dnf
41.557
General notes: You can blame it on the cool track and the inability to keep heat in the tires, the new suspension setup, the tune, it being the first event of the year, whatever... But I struggled this day to get the car to stick to my intended race line. In the end, I think it was a combination of all those things. You can see in the video the car was sliding around a lot. I threw down my best time my third run and was unable to improve on it all afternoon. I did not take full advantage of the grippy concrete surface, did not go hard enough into the Chicago box, and did not take a good line in the turn-arounds. Positives: I still had a blast and hopefully looked good sliding around the track
Tire pressures: I stayed around the 30-31 psi mark front and rear
Course Map:




Start is at the 12 o'clock position, finish is then obviously after the turn-around at the 9 o'clock position.

And video of my fastest run for the day:

Event 2
04-24-16
Weather: It was noticeably warmer this day, however still cool in the morning. The sun was out all day keeping the track warm, high was all of 70 degrees
Results: 2nd in STU, 33oo77 raw, 28oo77 PAX
Times:39.670
39.960
41.552
39.481
38.530
39.123
General Notes: The car felt much more as hit had the past year this day, that is to say much more grippy. Course was approximately the same as Event 1 but in reverse and with a few "extras" added to slow us down. The real spot to save time on this course was in the slaloms on the concrete section of the course. As the day went on, I slowly grew some ***** and went more and more flat out over this section to the point where I had to go into a different map on my tune with the rev limiter bumped up to 7400 RPM. While I do not make any power at these high revs it kept me off the rev limiter. I took a much more aggressive approach and exit to the Chicago box this day and tried to stay as tight as possible coming into the timers at the finish. The car that beat me was a very well setup 2013 WRX with a good driver. He is running this year's RE71s which he claims to be good for 2 seconds (anyone have opinions???). At the end of the day I was able to get to a 1.5 seconds behind him which at least disproves the 2 second theory, but still wow. It is going to be a difficult season! The good news is I ended up ahead of the other Subaru that beat me Event 1.
Tire pressures: Today I went low, and the car seemed to like it! Still not rolling over onto the sidewalls. 28 psi front/rear.
Course map:


Start is on the left, finish on the right.

Video of my fastest run:

And video from inside the car the morning of Event 2. I know my inputs are a bit twitchy and aim to make them smoother. This was while it was just warming up and the tires were slipping, slipping, slipping, GRIP!

As an added bonus, after Event 1 we were able to get in some "ProSolo launch practice". This was my first time ever doing "ProSolo launch practice" so the first video I was not very aware of where my redline was, second video was WAY too much tire spin off the line. But it was still a blast! (Oh no, not another racing obsession!) Also on a side note, the third run (I missed 3rd gear on our second run so not worth posting) was against the Subaru that beat me Event 1, and even with all my tire spin we still finished pretty darn close. Says something about how these cars are classed.



As always, give me your comments and constructive criticism!