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Discussion Starter #1
In preparation for returning to track duty, we headed to the local Autocross in hopes of really working the suspension, engine and brakes. Better to find any problems here than out on the track.




Here's the first run - let's just say when you charge into the first turn and the brakes don't work as you expect, well . . .


Second run - definitely something wrong with the rear brakes . . .


Finally, I remembered I had pulled the ABS fuse when I was working on the car (doh!). Third run WITH ABS . . .


Everything went smoothly thereafter until the 9th run. We started leaking coolant - the cap I had placed on the heater hose outlet was leaking. No big deal.

All in all, a fun day. We'll do at least two more before heading to VIR. :D
 

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Ahhhhhh, the wonders of modern(ish...) technology :D

Third run certainly improved! Nice that you got 9 runs out of the day too
Can't help but think there was a good deal of data acquired
 

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Discussion Starter #4
I took my brother along to co-drive - I wanted to get as many runs as possible on the car. We got 5 runs each. Lots of good info.

Tires were another issue - the rears were harder than the fronts. Plus the rear sway was set at the stiffest setting. Result was significant oversteer. :eek: You can see it in the third video on the long RH sweeper after the first turn-around. Not sure if it was the different tire compound or the rear swaybar. Next event we'll have a new, matched set of tires - then we'll play with the rear sway.

The car is on the lift now - I'll be checking and torquing everything before the next event. :cool:
 

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Discussion Starter #5
Eye Candy!

I like this one - it shows the neg camber in the front wheels.



This one shows that even as the suspension compresses, we don't lose any neg camber in the front - infact, we might gain a bit.



Be careful - two wheels in the grass is a DNF!



This a little more body roll than I'd like.




Other pics . . .



 

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Where did you end up for camber anyway? Those pics give it a look of about -3

And I love the "2 in the grass" pic. :thumbup:
That one speaks to me...
 

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Discussion Starter #7 (Edited)
Static setting is -2.5 at all four wheels. I can go up to -3.5 in the front and -4 in the rear (static). The suspension gains neg camber as it compresses - I plotted a camber curve in my Track Car Prep thread (post #162). I'm guessing at the compression you see in the second pic - it is about -3.5 degrees. I'd like to do some skidpad testing to determine optimum settings.
 

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Discussion Starter #9 (Edited)
Made a more permanant fix to the coolant leak - it seems fine now. Also, after all my bragging about how my 285s don't rub (how do you guys put up with me :rolleyes:) turns out I was wrong. The pics don't lie - it was definitely rubbing on the sharp inside edge of the fender during full compression.



I don't have a fender rolling machine so I used the tried-and-true baseball bat method. It takes two people - that can communicate well. :lol: If you've never seen it done, this youtube vid (not mine) will give you the general idea.


Next AutoX is in a couple weeks! :D
 

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Awesome stuff man. Thanks for sharing. By the way, have you thought about a GoPro? I built a custom mount for mine and I get a lot less rear view mirror in my shot haha. Seriously though, that video was great. The real time speedo and lap position was very cool.
 

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Discussion Starter #12
Awesome stuff man. Thanks for sharing. By the way, have you thought about a GoPro? I built a custom mount for mine and I get a lot less rear view mirror in my shot haha. Seriously though, that video was great. The real time speedo and lap position was very cool.
I do like the GoPro, but I also like the telemetry that my setup provides - albeit rudimentary. There are lots of display options with the map and g-force meter. It will display the map in green where you are accelerating and in red where you are braking - very cool. The video telemetry is fairly crude, but you can output the raw data to a spreadsheet and really compare each lap or run side-by-side.

Here's a pic of the setup: iPhone 4s with a wide angle lens attachment running the app while shooting video.




For AutoX, I normally swing the mirror up out of the way, but I forgot. Ooops.
 

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I can definitely understand how that telemetry is worth it for you. In reality all the GoPro buys you is when other people watch it they go ooo... pretty.....

Does the app have a limited range for the track? Because that would be really cool to have for something like the Dragon's Tail.
 

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dude this is an awesome thread! really like what you did with your car.
also like to point out that its nice to see someone else from wake forest. maybe i'll see you around sometime. this town isnt too big :D
 

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@CanyonRider-
What's the app you're using for the data overlay again? I'd swear you posted all about it earlier, but darned if I can find it again....
 

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Discussion Starter #18
Does the app have a limited range for the track? Because that would be really cool to have for something like the Dragon's Tail.
As long as you have a GPS signal and cell coverage, it works. I've riden the dragon many times on my Cagiva - absolutely a hoot, but I don't think the cell coverage is very good there.

dude this is an awesome thread! really like what you did with your car.
also like to point out that its nice to see someone else from wake forest. maybe i'll see you around sometime. this town isnt too big :D
Thanks. I'll be running in the Jimmy V charity autocross in Fayetteville in a couple weeks - com'on down, sign up to run - it's for a great cause.
Community Events The V Foundation

What's the app you're using for the data overlay again? I'd swear you posted all about it earlier, but darned if I can find it again....
It is TrackAddict HD by RaceRender:
TrackAddict HD for iPhone®

what are the details on your suspension set up? like what are you running?
Suspension details:
Eibach Pro-kit Springs all around
Bilstein Shocks all around
Poly bushings in all front upper &lower control arms
Poly swaybar bushings
Eccentric bushings in front upper A-arms (for more front camber)
Adjustable upper ball joints (for even more front camber)
28.5mm front swaybar with adjustable endlinks
27mm adjustable rear swaybar with solid endlinks
Solid aluminum body mount bushings in front sub-frame
Rear lower control arm mounts modified to provide more rear camber

I like it so far, but I only have one AutoX on it - prior to this it was completely stock. I'm still getting comfortable with the car - it's a lot twitchier at the limit. The stock suspension would ease up to the limit and give you plenty of warning before letting go. Only minor steering or pedal inputs were required to correct the car. The new combo of stiffer springs and sways coupled with R-comp tires, push the grip limit much further, but when you cross it, it lets go abruptly with much less warning. I have found my self turning the wheels to full lock a couple times to correct oversteer. :eek: Makes for a fun ride!
 

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Discussion Starter #19 (Edited)
Loaded up and headed to Piedmont Dragway in the morning - no, not 1/4 mile stuff - autocross! The shakedown continues . . . Last one before VIR!

This is a rough approximation of the course layout. Looks like we'll be using most of the parking lot and service road.



Should be fun!
 

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Have fun!
 
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