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Old 05-19-2012, 11:13 PM   #151
JDwhiteWRX
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Sorry guys no real updates. The potentiometer for the rear suspension has arrived but I haven't found the time to do the logs, every weekend has been busy.

I was at the track yesterday as our club ran a time attack but I was there as an official doing sign on and grid marshal.

I have June 9th,10th and July 2nd at the track so I should have the logging finished before then and lots of results on how the car is performing with the aero.
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Old 06-01-2012, 06:39 AM   #152
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Hi guys,

No aero updates yet but last weekend I went along to a Japanese Sports Car Club skidpan day at Eastern Creek Raceway to show them how Subaru's get around the cones.

Enjoy!

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Old 06-01-2012, 06:39 AM   #153
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Double post

Last edited by JDwhiteWRX; 06-02-2012 at 09:47 AM.
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Old 06-01-2012, 12:17 PM   #154
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Do you have the DCCD center differential that dis-engages when the hand brake is engaged?

Looks fun, but I'm fairly certain I would destroy my center diff if I tried that with my USDM WRX 5spd
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Old 06-01-2012, 08:35 PM   #155
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No just a 5-speed, I've been doing this for a few years now along with many others in our club and I've never seen any center diff issues.
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Old 06-04-2012, 02:56 AM   #156
mrcrazydude
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Default at the track June 9th-10th

Quote:
Originally Posted by JDwhiteWRX View Post
I have June 9th,10th and July 2nd at the track so I should have the logging finished before then and lots of results on how the car is performing with the aero.


Hey Mate,
just finished reading through all of this, and I'm wondering what track you're at this weekend? I've got a friend at the Creek, and I was thinking about heading down on the 9th if I can squeeze it in.
Would be awesome to have a nosey poke at your car if thats where you are going to be!

Cheers, Tim
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Old 06-04-2012, 08:50 AM   #157
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Quote:
Originally Posted by mrcrazydude View Post
Hey Mate,
just finished reading through all of this, and I'm wondering what track you're at this weekend? I've got a friend at the Creek, and I was thinking about heading down on the 9th if I can squeeze it in.
Would be awesome to have a nosey poke at your car if thats where you are going to be!

Cheers, Tim
Hi Tim,

Sorry I'm at Wakefiled Park down near Goulburn this weekend. We are at Eastern Creek skidpan again on the 17th but obviously wont have the aero fitted. I am also at Eastern Creek full circuit on the 22nd of July for a Supersprint.
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Old 06-04-2012, 07:55 PM   #158
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Quote:
Originally Posted by JDwhiteWRX View Post
Hi Tim,

Sorry I'm at Wakefiled Park down near Goulburn this weekend. We are at Eastern Creek skidpan again on the 17th but obviously wont have the aero fitted. I am also at Eastern Creek full circuit on the 22nd of July for a Supersprint.

Yeah, when I looked at the lineup for this weekend, I figured you would be somewhere else. Oh well.
Both those dates are Fridays??

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Old 06-04-2012, 09:25 PM   #159
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Quote:
Originally Posted by mrcrazydude View Post
Yeah, when I looked at the lineup for this weekend, I figured you would be somewhere else. Oh well.
Both those dates are Fridays??

PM Sent
No the 17th of June is a Sunday and so is the 22nd of July. I will reply to your PM.
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Old 06-08-2012, 05:36 AM   #160
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What are the specs of your new wheels?
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Old 06-10-2012, 08:11 AM   #161
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Quote:
Originally Posted by scubynoob View Post
What are the specs of your new wheels?
They are 17x9 +42

http://www.fastwrx.com/mavawwh.html
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Old 06-14-2012, 08:56 PM   #162
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Wakefield Park Supersprint Round 3

Here is my official report after looking over the car after the sprint and all the data. Round 3 was held as part of our club driver training weekend, probably the biggest weekend for the club each year with something like 90 people showing up for the dinner on Saturday night. I got down to Goulburn early on Friday afternoon to help Phil Bunter our chief driving instructor setup the track which we didn't finish until around dinner time. We were using my car to test the coarse and Phil was driving it like he stole it through the tests in the dark. It was quiet a thrill being in the passenger seat zooming through the pitch black with cold tyres, so cold that they even caught Phil out at one point and we had to make a small repair to the aero before dinner after a little off track excursion

Driver training on the Saturday was great as usual, I had a lot of fun although had to be a little more conservative with the aero fitted to the car and keep it on the black stuff. My fiance was also entered this year and really enjoyed the morning sessions in her Suzuki Swift. In the afternoon she did a couple of full laps driving my car because I didn't want her to destroy her tyres and brakes.

I was lucky enough to get some instruction from Phil in the afternoon when doing full laps and learnt a few places where I could make up some lap time. Phil also drove my car for two hot laps after lunch with me in the passenger seat, this was amazing and I couldn't believe what my car was capable of with such a good driver behind the wheel.

The supersprint on Sunday went well too although it was a late start due to the fog so we all got let out on the track for a little photoshoot to kill some time, the fog didn't actually lift until around 11:15am.



Once the fog lifted we were let out as usual, my first session out I smashed my PB of 1:10:7 with a 1:09:9 with still a little fog on the track, things were looking promising!
Second session did a 1:10:3 and then lost my line into turn 2 and did a huge sideways slide up the hill, tyres were overheated and that session was as good as over.



Third session I managed a 1:09:4 on my 3rd lap, was very happy! went up to the tower and they had it as a 1:09:6 which is odd because my timer has always been spot on with their times however when I got home and looked at the log on the computer the graph was a bit rough so there must have been some interference with the signal.



Here are the official times from the day, I also finished first in my class although this was partly due to my mates trailer having issues whilst bringing his track weapon down Sunday morning and not being able to run in his car. Last supersprint he smashed my time!

http://www.natsoft.com.au/cgi-bin/re...2012.WAKE.S3.Y

Looking at the logs from Racechrono the car still has lots more time in it, one of the predicted times was a 1:08 flat and my lap times are very inconsistent which shows the nut behind the wheel is still very loose

This graph here shows some huge speed improvements through turns 3 and 6 which are two of the more high speed corners on the track. I'm putting down to the home made aero allowing me to push much harder here. The blue line is my old PB from last year and the red line is my 1:09:9 lap (the 1:09:4 data was not smooth enough to use).



For this supersprint I had dropped another 36kg out of the car with the Spec C doors (Thanks Rising Sun Subaru!) and took my tow bar off but I'm putting the better times down to the driver training, big thanks to Phil Bunter for all his help on the weekend! even though he did made a bit of a mess of the underside of my front splitter I also changed my front brake pads from the Elig SB511's to Hawk DTC60's, still running the Eligs in the rear. Performance was similar however the Eligs were finished after one day and the Hawks have another sprint left in them.



I only did one session after lunch because one of my front rotors had started to crack in two places, I run cheap rotors which cost me $40 each. So these lasted 2 full supersprints, I was getting about 5 - 6 out a set of $800 DBA5000's. I have just ordered another 4 front rotors for $160 and I still have one spare from my current set. That should be more than enough to finish out the year.

There was two cracks, this one failed at the notch but there was no notch at the other crack otherwise I may have tried for warranty



These should keep me going



Thanks for reading.

Last edited by JDwhiteWRX; 06-15-2012 at 04:38 AM.
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Old 06-15-2012, 01:36 AM   #163
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Another nice writeup Joel!

What's the computer that you are using for timing/data etc?
What details do you get out of it?

Cheers,
Tim
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Old 06-15-2012, 02:22 AM   #164
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Hi Tim,

I use Racechrono which is a free software you can download and run on a smartphone, I also use a portable GPS receiver which connects to around 10 satellites at once and sends data back to the phone via Bluetooth. So it just gives me my position and speed which can be loaded into Racelogic Performance Tools to look at the data.

There are better loggers out there these days but this one has done me well so far.

Last edited by JDwhiteWRX; 06-15-2012 at 09:36 PM.
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Old 06-15-2012, 05:00 PM   #165
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JD, where are you getting 40 dollar rotors from?
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Old 06-15-2012, 06:30 PM   #166
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He's from Australia, but for us in the USA... just get the cheap'o rotors from Schucks / O'Reillys / Autozone / etc.
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Old 06-15-2012, 06:54 PM   #167
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JD, are you running the normal size WRX rotor?

Since you drive track days often you might like an idea i've been toying around with of running Nissan 300zx brake calipers...

They are nearly the exact same calipers (except for the attachment points) but use a 30mm thick rotor (instead of WRX 25mm). Depending on how you get the bracket made, you could run either the 315mm dia LGT rotors or even 325mm dia STI rotors. The fronts caliper attachment points are closer together and would need an adapter bracket, where the rears bolt on perfectly but the pad stick out 3mm off the rotor (give possibility for larger dia. rear rotor).

Some additional advantages are:
-They use the same brake pad and rebuild kit as your current caliper
-Same 4x 40mm and 2x 36mm pistons.
-You can get them used for cheap.
-For the fronts, they made 26mm Aluminum ones as well as 30mm Aluminum or Iron calipers depending on the model / year (subaru ones are iron).
-The rears use the same thickness rear rotor as subaru, but like I said, stick out a little farther.

You would probably just stick with your subaru rear calipers, but I'm on regular sliding calipers and will be changing out all 4.
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Old 06-15-2012, 09:45 PM   #168
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BeBop86 that sounds like a nice setup, the only real reason I'm persisting with the stock setup is I may just as well go back to driving on dirt next year. Investing in bigger brakes is not possible at the moment anyway as I have my wedding in September.
Part of me really wants to further develop the aero and keep pushing my driving ability to drop the lap times but the other part of me just loves driving on dirt. I wish I could afford two cars
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Old 06-19-2012, 03:16 AM   #169
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Great writeup im looking forward to more of that old fashion Research and Development.
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Old 07-30-2012, 08:07 PM   #170
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Hi guys,

Its been a while since I updated whats going on with the car, not much is happening with the aero development since my mate who I was doing all the data logging with has taken a job in Western Australia.

A couple of weeks ago I took the car to Eastern Creek for the first time but only got one session or 5 laps in because of rain and oil down. My best time was on my 5th lap and was a 1:56, not good enough to enter WTAC



The other thing I have been doing is trying to get more life out of my brake pads and rotors by adding some more cooling. I run the little 4pots with 295mm rotors and Hawk DTC60 brake pads. I have been making my own water cooled setup to add a little extra cooling.

The system uses a generic window washer bottle and pump with 0.3mm misting nozzles, hole lot was about $30. The pump is powered from the 3rd brake light so only sprays when I press the brake pedal.

I finished running the hard lines on one side tonight and will do the other side tomorrow night. You can see I made two simple brackets to hold it in place using the same mounting points as the ABS lines. The hardest part was bending the lines to shape, it was a bit of a mind bender using the tool





Here is the view looking down into the rotor veins, you can see I trimmed a little metal off the nozzle since there is not so much room in there.


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Old 07-30-2012, 09:07 PM   #171
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Water cooled brakes? Ehhhhhh....
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Old 07-30-2012, 09:16 PM   #172
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Quote:
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Water cooled brakes? Ehhhhhh....
I had the same reaction. Looks like there are a few stateside GTR's doing it and it's pretty common in the Aussie V8 super car series since they have rules that only allow certified brake duct openings which don't appear to work well enough.
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Old 07-30-2012, 10:10 PM   #173
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Yeah this is a quote from the people who developed the GTR kit and also ran it on their STi.

yes we do run the WR35WS system on Project STi. Keeping brakes on this car at the track without it was almost impossible. (Mallala is a shocker track on pad temperature). It was easy to see > 700c within 3 laps when trying to put a quick one in. With water cooling that number is closer to a consistent 500 - 530c, which is right in the meat of the pads operating range (normally Endless N35S compound). At these lower temps not only does everything work better, but also pads/discs last around 50% longer.

We dont 'mist' the water at all instead its directly injected into the vanes of the disc rotor from around 5mm - 10mm away. Even at that distance the heat transfer is so great there is no water/metal contact, with the state change to steam being very rapid. This kind of direct water injection was used on some of the Sierras back in the Group A days, and V8 Supercar teams at street circuits like Indy where brake temperature control was critical. It works very well
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Old 07-30-2012, 10:22 PM   #174
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Yeah, I know for those cars they need them but I just can't see the need for that on a 4 pot setup. However, be sure to take pictures and let us know how they work out for ya!
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Old 07-30-2012, 10:36 PM   #175
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Just FYI water cooled brakes are banned in NASA racing... at least Performance Touring. So make sure the race series allows it before you mod.
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