a quality competitive BSP build, will run you 15 grand easily. and for real, a BSP car when complete is pretty much undrivable on the street. id reconsider that class.
The car isn't mine, it's already built, and I'm driving it for a local shop. It currently makes 370 whp (3" exhaust, HPFP, tune, custom shop intake) and has custom valved shocks (for race/competition) with 650f/450r spring rates.a quality competitive BSP build, will run you 15 grand easily. and for real, a BSP car when complete is pretty much undrivable on the street. id reconsider that class.
but in order of BSP legal things to change on a car that make the most difference to the least difference:
-as big of R-comps mounted on as wide of wheels as possible
- something like 3 degrees negative camber all the way around (probably more in front than in back), maybe a slight amount of toe out in back to promote rotation
-as stiff of springs and roll bars as you can muster with some decently valved adjustable dampers (lowest quality: koni yellows)
-tune for e85 and as much boost as possible
-cat delete, full 3 inch exhuast
AWD controller to push more power rear might help too, im not terribly familiar with if the haldex on the mk6 is any good at that or not.
STX is a hard class these days, and being a mostly new car class there are lots of options to choose from and you can build a good car with new parts. Not surprising its mostly a FRS/BRZ deal. Surprise of the year was definitely the Z32 that finished 2nd in that class though..I built my R for STX and competed locally and nationally this year. Lots of time and $ spent. Car is fun to drive but sadly it's just too heavy to compete (I think) in STX against the BRZ/FRS. The R weights 3200, the twins weigh around 2600 - 2700. I did fairly well at a few pro solos where the launch is a huge advantage. At Tours I got my ass kicked including at Nationals. I was really hoping for rain...that was my only chance for a top place finish. Locally the car can top pax but that's because of smaller sealed asphalt lots.
BSP...I've considered that as well. Make a ton of power. I think the biggest issues is tire size. In STX 245 is the max tire on an 8" wheel. Fronts with 3+ of camber has some room but the rears are tight with 245's. Meaning cutting the fenders and doing some kind of flares or running massive spring to keep the fender off the tire.
I can share more info if you'd like. My results are out there as well as a bunch of videos on FB.
Correct me if I'm wrong, but the damper has a published ratio of .98 and the spring is somewhere in the range you said.I am new to the r as an autox platform. I am curious how you are getting a rear motion ratio of 1. Most discussions I have seen put it around .6-.7. Has the shop done something custom in the back?
I'd think the 255/45 and 225/45 would be quite different rolling diameter wise...for the AWD R that's a no no.Hello Kevin,
Regarding tire space at the back of your Golf R. I am only running a MK5 in STX but I noticed that 255/45 on 17x9 at the front and 225/45 at the back works best for me. I got inspired by the European Audi RS3 who came as an option from the factory with this configuration. I wonder if you really need to have the same tire size at the back?
What spring rates are you running?