Good question. I guess I kind of assumed it. I was asking people locally at my last event how I could get more negative camber. They told me to see if crash bolts were available for the EVO. I guess this needs to be verified.

One statement from the rulebook that might cover it. Section 13.0:
"Alternate parts listed in a factory parts manual are not authorized unless their use is specifically referenced in the factory service manual or in a service bulletin for the specific model."

Anyone have a factory service manual?

As for the tires, I haven't driven the 710s yet but I've heard good things. I just wish I could get them in a different size.

 

To the best of my knowledge, there is no official Mitsubishi documentation authorizing crash bolts. Unless you can find such documentation, their use in Stock class would be illegal.

For a Stock class Evo, you can get all of the negative camber you need on the rear wheels. On the front, you can turn the eccentric bolt around. That's about it. You can maybe get an extra 0.1 or 0.2 degrees by loosening all of the bolts and then pushing the suspension as hard as you can into a negative camber position before retightening everything.

 

Here are a couple of pics showing the rubbing I am getting with the Kumho V710 in 275/40-17. This is on a 17x8 wheel with +33 offset. These pictures reflect about 40 runs worth of rubbing. YMMV...

JW

 

That doesn't look bad at all. It looks like rubbing only occurs when you are at full lock.

Do you know what the width is of the widest part your tire is(sectional width)? Also, what is the width of your contact patch? I have the 245/45/17 V710 on stock wheels and I'm curious what the size difference is on the same size wheel.

 

Finally got around to measuring the section width. Mounted on an 8" wheel, the 275/40-17 V710 comes in at about 10.25". As for contact patch, that's a bit less straight forward to measure, but looking at how much of the tread I am using based on scuffing of the tire, it looks to be about 10.5". That includes pretty much all of the shoulder on the outside and almost none of the shoulder on the inside...

JW

 

This is a bit off topic but I have been getting some loud clanking from the front end over bumps during runs. I have a stock setup.

I retourqed the strut bolts (150lbs. manual says 130). The sound is less "metallic" but still there. I also tightened the bolts at the top of the strut.

Is this normal for others with stock suspension?

Sometimes the sound is loud enough to distract me during runs.

 

Could some of you guys that are running the 275s post some pics of the tires/rims?

What is the offset on the stock rims?

Is there any rubbing on the strut?

I would love to run that tire size. Currently running 245 victoracers.

 

Just answered my own question the stock rims have a 38mm offset according to the manual.

 

I had the same thing happen. Was the course rough?

The one I was on was rough. The shocks were bottoming out. The only thing you can do is buy some better shocks. This is legal as long as you keep the stock springs(there are a few more rules you should look at before buying though).

 

Thanks for checking that.

Are you getting any heat in the rears? Do you feel like you need any?

I'm doing a fun/test n tune on the 4th. It'll be the first time on my 245/4517 V710s besides heat cycling. I'll report any interesting findings.

 

It was pretty bumpy. I guess you could be right about the shock bottoming out. I hate that sound. I keep thinking that something is breaking or broken.


Has anybody purchased the revalved Konis that I hear some mention?

What shocks would you guys recommend?

 

That's a tricky question, because unless you're really dedicated to competing in Stock class, you probably won't go to the trouble of buying shocks to fit into the stock suspension. Selection and availability get much much better if you go with a full coilover setup -- which would bump you out of Stock class (most likely to ST or SP).

jwtodd60 has stuck with A Stock for his 3rd consecutive year now in the DC region, but it's an uphill battle against the S2000s which got moved into A Stock in force this year. Just about every other Evo owner/driver locally has gone the route of the full adjustable suspension, moving up to STU, ESP, or SM.

 

I hear you. I am trying to stay in stock class. I just sold my SM2 Miata. You don't get the money back for your mods unless you part the car out (which realistically I don't have time to do).

Having said that, in my local club I am competing against some national level drivers in A Stock (STI, Corvettes, EVOs with front LSD, MRs, etc.). If I move up to SM I run into the likes of Mark Daddio and other more experienced drivers. So... I am used to not winning my class.

I have thought of moving up to ESP though. I guess it is just a matter of time (and $$) I would like to do a downpipe and Tein coilovers though. My wife has other ideas for our $s. LOL

 

Well I got to try out my V710s yesterday during a practice session. I was at the North Paddock at Portland International Raceway(not so big). It was about 90 degrees out. The course was a fast ~65 second(2 laps) course.

One factor that really messes with my testing is the heat. 20 seconds into the run and the tires were hot and greasy. This seemed to be a problem with everyone on stickies. We had a water hose to cool them down after each run.

I started the tires out at 45psi all of the way around. The fronts wore pretty close to the edges so I tried 50 in the front 45 in the rear. This seemed to be OK for tire wear on the shoulders but there was definitely understeer.

While trying to dial out some understeer, I decided to go back down again and drive at about 80%. I tried 40 front, 45 rear. This time the understeer was reduced greatly, but the tires would wear well if I kept it that way and drove 100%. Next, I tried 46 in the front and 50 in the rear. This seemed to be the best balance between tire wear and understeer. We were done for the day. Next time I might even try a few more pounds in the rear to try to lessen the understeer a bit more.

The bottom line is that I think the 245/45/17 is too small of a tire and of course we can't get enough front negative camber in the front of the Evo in stock trim.

Has anyone tried a 275 front 245 rear staggered setup? Is this possible with the tires available? Would this be a problem for the center diff?

I've got another weekend of autocross fun coming up. Hopefully it won't be as hot and the tires will behave better.

Peace.
Boder

 

Boder,

What wheels are you using (brand) for the V10s?

The staggered setup has been tried by Mark Daddio on his SM EVO. Check it out here:

https://www.evolutionm.net/forums/sh...07#post1997807

Obviously Mark has done some changes to the suspension that are not permitted in the stock class but worth a look for general trends.