madmax199

iTrader: (20)

Clipping apex curb at the track has the potential to bend/crack most wheels. I have seen a lot of other wheels(not to say that the RPF1 is immune to flex) damaged on the road course.

For reference, I personally bent a 5zigen fn01rc last year at New hampshire and they were suppose to be much stronger and less prone to flex.

I was also skeptical about the rpf1s but many examples of cars running them for over a season of wheel to wheel racing convinced me that they can take the abuse although, like many other popular wheels, aren't indestructible.

r0me0ne

iTrader: (1)

i think it all depends on how much your going to track your car...

r0me0ne

iTrader: (1)

if its more of a DD car then i think you should be fine with those wheels...

spdracerut

iTrader: (2)

Clipping, driving over, etc. Some curbs are more forgiving than others Not to mention, some suspension setups are more forgiving than others. And then there's just driving style... I know of a driver that uses a particular curb to rotate the rear of the car Out here at Buttonwillow, there are some pretty damn big curbs!

nils

iTrader: (56)

I cracked a DMS 50mm shock at BW

n

20psiMR

iTrader: (6)

Im in flippin Minnesota for work, its cold out here! brrr!

bchappy

ouch...
bet that was fun, What are you on now? or is it a secret

bchappy

Ya I dont feel like screwing that one up
Well, I guess its better than using other cars

bchappy

WTF... its like 100 here, You make up your mind if your coming to RTA/GTlive?

bchappy

ALOT.

nils

iTrader: (56)

going to be on sum vely vely nice KW's soon!

n

teamsprock

iTrader: (3)

I think the one thing that has been mentioned in here but not clearly stated is, the type of cars having these issues are not your average DD evo. From what I read and understand from the issues Robi from Robispec has had, it was with high speed grip cars... i.e. a huge force on the wheels. So for the people cruises through the thread, I think a rule of thumb on these wheels is (if you run r-compound tires, definatley something to consider. However if you are on street tires, it's good info to have, however you are probably not going to be able to generate enough grip with street tires to cause a significant amount of flex.)

I understand I generalized things when I said street tires. basically I am saying track cars beware, street cars that are not optomized for grip probably not an issue.

Curious if anyone agrees with me on this?

Warrtalon

iTrader: (6)

Yeah, that's pretty much the case. It's no concern for a street car and probably no concern for an Evo racing on street tires.

bchappy

ya still not going to chance it though...
it only takes one hiccup and theres a few thousand in damage if it goes real wrong

teamsprock

iTrader: (3)

In looking at my rpf1's and my stock ix enkei I wonder why enkei recommends a generous amount of clearance for the rp's however they do not allow that clearance on there wheels from the factory. from a strength perspective (the moment of inertia looks roughly the same and they have similar stress concentrations) the two wheels seem similar, giving a slight advantage to the rp's for a thicker spoke. So a couple questions that I wonder about, do the casting processes on the two wheels differ, or the material?.... all this still leads me to believe that this only is a concern for high grip applications. It also makes me wonder since the factory wheels have so little clearance, do people who run r-compounds for track duty (I am sure someone is doing this) on the stock wheels have the same risk associated?

I would be curious to hear someone explain the mode of failure, what plane is the wheel flexing in and what flaws in the wheel do you think are causing this... geometry, material, load paths etc.?