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10-02-2007, 06:39 PM | #1 |
Former Vendor
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Redline Time Attack Summit Point Video Air Time Baby!
All I can say is yikes as most of us in the unlimited class were airborne just after the bridge. It’s hard to tell in the video but wait until the pictures from the event come out. The JIC suspension seemed to handle it well however and the car was in great control without bottoming out.
http://elementtuning.com/Videos/Elem... 2007 Web2.wmv We recently upgraded to a Cusco 1.5 way rear diff (Thank you GearboxTech.com for getting that setup for Element Tuning) after blowing the OEM STi unit. Without any track time to break in the rear differential I showed up Sunday to race to a big surprise. The lockup was so aggressive that I had people coming up to me asking if we had converted our car to rear wheel drive as I was drifting huge all over the place. Man this was unexpected but definitely a step in the right direction to get rid of corner exit understeer. This was definitely exacerbated by my inability to build any heat into our rear Hoosiers as temps never broke much above 160F given the short race format. The aggressive lock up also had the front pushing on entry and massive oversteer on exit, really making the car very uncomfortable for me to drive. The tire temps played a big role here but also the track is very slow and our downforce really wasn’t working to our advantage at these speeds. Once we get the car set up for the new diff I think it's going to be a huge improvement. I have also been running the new 6 Gun Ball Joints and Tie Rod Ends and I think this was the ultimate test of durability. From my quick visual inspection they appear to have held up perfectly but we'll give them a much closer look as we prep for VIR. This was our first true “Unlimited” race and it’s extremely competitive with most teams +100 whp and 300-400 lbs less. This was the first time I ran our STI here and the second time I’ve run this track but I just searched for traction where I could find it which had me very slow in, hugging the inside line, and then doing my best to power out cleanly. It’s definitely not the fastest way around the track but it was the only way I could stay comfortable and consistent. Congratulations to all the winning teams and drivers! We’re off to VIR next week for GT Live where the car has been tested and setup so I’m looking forward to being in my element. I’ll be sharing driving duties with Tarzan Yamada that weekend, with me driving only for setup and him for racing. It will be nice to compare our times in the same car at the same track. Since this track is much higher speed with long sweepers we haven’t had any issues getting the tires up to temp so for the most part I’ve decided not to change much on the setup. We will add some limited slip additive to reduce initial lockup on the Cusco differential which should help on both corner entry and exit. We’ll play with the formula until it feels just right. Thanks, Phil Grabow Element Tuning http://www.elementtuning.com
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10-02-2007, 07:26 PM | #2 |
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NWIC
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Vehicle:2005 STI White |
That looks fast. Note for future videos, though: it'd be really nice if you could get a more centrally mounted camera position that points straight forward. It's hard to get a clear idea of your speed and lines and stuff with it skewed like that.
-Mike |
10-02-2007, 09:04 PM | #3 |
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Nice video phil! i wonder if you have any pictures of your car flying
good luck at VIR, you should be able to do a lot better there. Being you know the track better and you should be able to get your tires up to temp better. I know when i TA or race the first lap I'm all over the wheel and on the brakes to get everything warmed up. |
10-02-2007, 09:12 PM | #4 |
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This was at Shen right?
What are you running for times out there? I think Skip won his class in the dark S2k running 1:39's.... |
10-03-2007, 12:02 AM | #5 |
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Interstingly the JIC 911 had bottoming out issues coming over the crest after the bridge. After the 2nd timed session on Sunday, he bottomed out HARD, and then couldn't get all-4 into the carosel, which caused him to do a chassis-grind along the top rim of the carousel, then spun in the carousel. He was also seeing the highest speed over the crest, and had the most downforce.
Last edited by eclip5e; 10-03-2007 at 01:10 AM. |
10-03-2007, 08:44 AM | #6 |
Former Vendor
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As far as the camera angle I'm really limited due to the mount and the available space on the cage. I would like to move the camera back but I would have to purchase a different mount.
Spazegun, Thanks and we'll be more in our element at VIR and the car should shine but the competition won't be any easier. I know DSport Magazine took some incredible pics of the car flying through the air. Eclip5e, The JIC 911's chassis was extremely low to the ground, probably too low for this track, but who am I to judge the owned it! I was scraping my front air dam on the carousel eventually grounding the nut off and you can hear the splitter scraping and flapping on my last session. This track is definitely rough on the cars! Thanks, Phil www.elementtuning.com |
10-03-2007, 09:16 AM | #7 |
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Looks good to me, just different.
Are you planning on making suspension adjustments to reduce some of the oversteer, or are you just going to focus on adjusting your driving style for a bit? |
10-03-2007, 09:33 AM | #8 | |
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Quote:
I've never driven on this track or setup our STI here but I have lots of time at VIR where the car feels good so I am going into the event with the current setup and then make adjustments from there since I should have no problem getting the tires up to temperature. Thanks, Phil www.elementtuning.com |
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10-03-2007, 12:41 PM | #9 | |
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Quote:
I think in your case, Phil, you've got enough power to spin the rear tires, so when you tromp on the gas the inside rear tire tries to spin as fast as the outside rear tire (due to the tight diff) and goes up in smoke, causing the power-on oversteer. In my car, which has probably 1/4 the power of yours , when I get on the gas I can feel a decided shift to understeer because of the tight Cusco rear LSD I've got. I'm heading to Shenandoah this coming weekend. I don't think I'll be running 1:34s. Pat Olsen |
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10-03-2007, 12:49 PM | #10 |
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Why not the cusco 2 way for the rear?
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10-03-2007, 03:37 PM | #11 | |
Former Vendor
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Quote:
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10-03-2007, 03:39 PM | #12 |
Former Vendor
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Join Date: Feb 2004
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10-03-2007, 03:42 PM | #13 |
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Ive got a nice one of you in the air. I'll oost it tonight.
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10-03-2007, 06:24 PM | #14 |
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I think you should re-arrange to a 1-way instead of a 1.5-way. This will help corner entry understeer and give you the ability to increase center diff lock to put more of the power down during corner exit.
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10-03-2007, 06:43 PM | #15 |
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As promised. |
10-03-2007, 06:58 PM | #16 |
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Sweeeet jebus!
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10-03-2007, 07:07 PM | #17 |
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Haha! Nice air!
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10-03-2007, 07:09 PM | #18 | |
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Quote:
Think of your 3 wheeler going on a circle in dirt. Inside rear just spins at the rate of the outside wheel. Any way you slice it, it would make sense for wheels sharing an axle that maximum grip will only be achieved if that axle is traveling straight, since to turn that axle is to ask one or the other to turn slower or faster than the pavement is moving by them. Chris Lock |
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10-04-2007, 09:31 AM | #19 |
Former Vendor
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Join Date: Feb 2004
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Vehicle:673 WHP Element Tuning Pro Comp Engine |
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