The Official "RX8 in DSP" Thread
12-17-2013, 01:42 AM
#77
Looking for some clarification on the Splitter rule.
A spoiler/splitter may be added to the front of the car below the
bumper. It may not extend rearward beyond the front most part
of the front wheel well openings, and may not block normal grille
or other openings, or obstruct lights. Splitters may not protrude
beyond the bumper
Beyond the bumper meaning the sides of the bumper, or does this also mean the furthest most forward part or(nose) of the bumper?
I'm trying to see if the APR splitter Sipe used in STX back in the day would be legal, or if it is adjustable and can be made to fit.
A spoiler/splitter may be added to the front of the car below the
bumper. It may not extend rearward beyond the front most part
of the front wheel well openings, and may not block normal grille
or other openings, or obstruct lights. Splitters may not protrude
beyond the bumper
Beyond the bumper meaning the sides of the bumper, or does this also mean the furthest most forward part or(nose) of the bumper?
I'm trying to see if the APR splitter Sipe used in STX back in the day would be legal, or if it is adjustable and can be made to fit.
12-17-2013, 11:16 AM
#78
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The splitter cannot extend beyond the furthermost part of the bumper. I.E. looking down at the splitter from above the bumper.
Beyond the bumper means sides and front.
Take the 6" dimension in this drawing and change it to 0".
Beyond the bumper means sides and front.
Take the 6" dimension in this drawing and change it to 0".
12-18-2013, 03:44 PM
#80
Hey Mike,
There was a tech bulletin in the September 2010 Fastrack which clarifies the splitter rule.
From here: http://scca.cdn.racersites.com/prod/...track-sept.pdf
There was a tech bulletin in the September 2010 Fastrack which clarifies the splitter rule.
Street Prepared: A splitter which is visible when the front of the car is viewed directly from above does not meet the requirements of 15.2.I.1. (ref. #1869, 1920)
12-22-2013, 09:50 AM
#81
You m*th*r f***er
Just got back from an 18 day solo trip covering the western half of Japan; Osaka, Kyoto, Nara, Okayama, Takumatsu, Tokushima, Hiroshima, Fukuoka, Nagasaki, Oita, Kamumoto, Kagoshima. I would sum it up in one word: wow. Most awesome experience of my life.
Back in the STX aero day the allowance was more liberal than SP. The splitter I had then is not SP legal, and of course non-production wings are not SP legal either. If you look at the splitter pics of Zelse's RX8 you can see that the amount of lip provided by the overhead bumper view rule is very limited. That said, the cost of the Joefiss splitter setup is so low it is hard for me to justify building my own. Not sure that I agree with the smaller than allowed rear spoiler though and am still assessing it. Again, the reasonable cost is hard to argue with for it too.
The engine is apart at the builder and was still in very good shape overall. Otherwise everything has been on hold on my car for the past month or so due to the trip. I did get a set of Bogart 17 x 10.5" wheels built. They were completed while I was away and requested that they hold off shipping until after Jan. 1 to avoid the holiday mess.
.
Last edited by TeamRX8; 12-24-2013 at 02:43 PM.
12-24-2013, 02:46 PM
#82
Just to clarify, it is everything beyond the bumper outline, not just the 6" part. If you only take the 6" off the corner areas still protrude. I know that you intended the same thing, just making sure someone doesn't glance and read it incorrectly.
Nothing can protrude beyond the overhead bumper view for the entire perimeter.
Nothing can protrude beyond the overhead bumper view for the entire perimeter.
01-12-2014, 07:42 PM
#88
275/35-17 Hoosier A6, just want it to be well supported
The wheels are not that light, but the extra weight is in the hub pad on a tight radius. In retrospect we could have gone a 1/2" wider on the outer shell and the same amount less on the inner shell with a 1/2" thinner hub pad and still had enough brake caliper clearance. On paper it looked closer to the caliper than what it ended up being and they were nervous about chancing it.
I would have to say that it probably makes more sense to go buy three sets of the newish 17x10 +50 Rota RT5 than one set of these, though they certainly don't have the bling factor. There is always the 17x10 Enkei RPF1 too, but I just don't care for the crappy +38 offset.
I'm going to need to change my speedway sway bar from the current straight arm design to a bent arm design with a shorter center section. The straight arm design was ok with the narrower wheels, but with the 10.5's sunk in so deep the inboard rim lip is going to hit the swaybar arm end where it attaches to the center bar. Otherwise they appear to clear everything else fine.
.
The wheels are not that light, but the extra weight is in the hub pad on a tight radius. In retrospect we could have gone a 1/2" wider on the outer shell and the same amount less on the inner shell with a 1/2" thinner hub pad and still had enough brake caliper clearance. On paper it looked closer to the caliper than what it ended up being and they were nervous about chancing it.
I would have to say that it probably makes more sense to go buy three sets of the newish 17x10 +50 Rota RT5 than one set of these, though they certainly don't have the bling factor. There is always the 17x10 Enkei RPF1 too, but I just don't care for the crappy +38 offset.
I'm going to need to change my speedway sway bar from the current straight arm design to a bent arm design with a shorter center section. The straight arm design was ok with the narrower wheels, but with the 10.5's sunk in so deep the inboard rim lip is going to hit the swaybar arm end where it attaches to the center bar. Otherwise they appear to clear everything else fine.
.
Last edited by TeamRX8; 01-12-2014 at 07:51 PM.
03-17-2014, 10:57 PM
#94
It was a good battle. Not having a tire warmer definitely hurt me as the BMW had 2 drivers and some tire blankets.
Other than that the car feels great, it will be going on the dyno next week. Also, i'm still on my STX spring rates of 560/400. Thinking about going a bit stiffer, anyone wanna throw out some numbers?
Other than that the car feels great, it will be going on the dyno next week. Also, i'm still on my STX spring rates of 560/400. Thinking about going a bit stiffer, anyone wanna throw out some numbers?
03-18-2014, 03:26 PM
#95
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It was a good battle. Not having a tire warmer definitely hurt me as the BMW had 2 drivers and some tire blankets.
Other than that the car feels great, it will be going on the dyno next week. Also, i'm still on my STX spring rates of 560/400. Thinking about going a bit stiffer, anyone wanna throw out some numbers?
Other than that the car feels great, it will be going on the dyno next week. Also, i'm still on my STX spring rates of 560/400. Thinking about going a bit stiffer, anyone wanna throw out some numbers?
It was a good battle. Nice driving, Mike. Car looked really good from where I was.
And sorry I kept calling you Mark; senior moment.
Last edited by Peter Florance; 03-18-2014 at 03:27 PM. Reason: .
03-20-2014, 08:39 PM
#97
03-31-2014, 03:32 PM
#100
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Alignment Settings?
Shock Setting?
Tire Pressures?
How old are the Hoosiers? I know when I was co-driving a DSP BMW, the age of the tires played a huge role in the setup. We would chase newfound pushing/oversteer situations with shock, swaybar, and pressure changes and ended up never really resolving the issue. Put on a fresh set of tires, and all the issues went away. Not masked....Gone!
Purple crack...gotta love it!
