Do ambient temps really have that much affect on brakes? Rotors get up to what temps, 1,000 something degrees? The percentage difference between ambient temps at 40 degrees and double that isn't very much at all when rotors are getting up to 1,000+. I could be completely wrong, but it's something to ponder.

Ahhh, I bet the mustache delete is the main cause. Sounds neat for a non dogbox transmission! Does that mustache delete cost any points?

Maybe I'll just email your TT director after your first event to get a look-see at your points.

I think that's the ticket.

I don't know why I'm telling you guys this but 255 Hoosiers are wider than 275's. Something to consider when putting together setups. My 245's are maaaybe an inch narrower all together compared to 275's.

 

Out of curiousity, isn't it hard to get 408whp in TTA trim? That seems like its pretty much TTS territory? I'm not at all familiar with NASA classing rules so please educate me.

 

Where do you find 255 hoosiers?

I always thought the same thing about the brake temps , but i had noticeable cracking after a really cold track day last year.
Could be a combo of the brake ducts and 2 piece rotors.

EDIT to boomn, What type of reinforcement did you use on your front splitter if any, im using the same one but its just bolted on to the front lip similar to the stock undertray and obviously cant provide much support that way.
Ive been trying to figure out the best way to keep the whole front end easily removable while creating a little more support , any suggestions?

Also have you looked into a rear undertray or do you get docked too many points for it?

 

Mine's not reinforced much really. I was happy it stayed on at Putnam actually - where you hit 125-130mph on the straight. Besides the stock hardware that mounts to the bumper tabs, I double'd the front adjustablable mounts in an effort to keep it from flexing. Then I took some....zipties.... to the crossmember. That's about it for me to this point.



I don't think you can make 408whp in competitive TTA trim. To stay in TTA you'd have to keep the stock turbo, so you'd need all the other tricks. Probably agressive cams as well which are a hurtful 6pts - along with an aggressive tune (which I'm not a fan of). All that might get you > 380whp and anything above that is due to a very aggressive cams and detrimental to the powerband.
Even if you could make that number; you'll be running skinny tires for sure! But hell, it might be the way to do it; never know.

As for tires, I'm up in the air on those to a degree. I know what I'm starting out with, but I could change if I need points here or there for other things. I've testfit several sizes, weighed different sizes, weighed rims, weighed rotors, etc. Mostly just for my notes. Yeah the Hoosiers in 255's are wide, but the 245's are also wide and the 225's are wide as well for their size.

I doubt many people check out the blog in my signature, but I have posted some pics of different sizes. Check this out from last year:
http://boomn29.blogspot.com/2010/04/...mparisons.html

 

If it's OK with the rules re-mount the splitter so it sticks out the front by a few more inches.

 

I'm going to attempt it on my Evo 8 with 245s. I don't know how hard it would be on race gas, but it seems doable on e85. I can run a pretty aggressive tune since it's only for a couple laps and because of the cooling benefits of e85.

Uhh, not sure what you mean with the winky face, but I would assume you can get them from any Hoosier dealer. FYI I'm referring to 18" diameter, the 17" 255's have a tall sidewall.

I literally blew up a front rotor once in the cold. I asked Jay Andrew of Andrew Racing if I maybe heated them up to fast. He said heating them up from 40* to 1000+ doesn't make much difference than if it had been warm out. Probably just a casting defect.



Aww c'mon, aren't you at like 370 something with a non-aggressive tune and no cams? An Evo 9 on e85 no cams could probably touch 400. For TT you can get away with aggressive since you're only out there for a couple laps.

I think it's worth the trade-off going to 245s to get that extra 0.4 adjustment

 

I would have gone with something custom that doesn't sit flush with the bumper. Is it parallel to the ground when it's flush up against the bumper?

edit: silly me, you can't mount it lower and run an airdam. That's the new ST-2 me thinking

 

TTS has close to the same power limits as TTA. however TTS has unlimited suspension, aero, chassis, etc...

the 408whp is also dynojet numbers. if you use a mustang dyno, its more like 370whp max allowed (10% less per the rules).

for the X with 275 tires its allowed roughly 431whp or 390 mustang. stock turbo can't make that much though, not without serious engine mods

and yes, i did miss the appedix C modifiers so more power for us

 

Can't. Like you mentioned; that'd be a 3pt splitter and 3pt air dam. We covered all this a few months back in the Aero thread that EVOlutionary started; it's a freakin huge thread!
I thought about going that route, but dumping 10 of my 34pts on aero bothers me! (the last 5 being the FI penalty/equalizer).

If you wanna try to make 408 on the stocker on a lean tune, go for it. I'm not going to try it. Not trying to be a dick, but havne't you popped a few engines already?

 

TTA and TTS have the exact same limits - 8.7:1 (with modifiers).

For you guys, looks like the X MR is TTB +14 at 3500 lbs. I punched them into my fancy spreadsheet and here's your maxes if you can get there. Dynojet numbers obviously. And I agree that 10% mustang multiplier is absolute crap. AMS told me theirs reads exactly 8% higher than the old Dynojet (which everyone but AMS thought read low)

TTA 245 Max - 438 .. 3500
TTA 275 Max - 417 .. 3500
TTA 285+......- 402 .. 3500

 

the stock evo 8 turbo wont make 400whp, no matter what you do (at least on the dyno we use). its maxxed out around 370whp. an evo 9 turbo can do 400whp on our dyno though, but it takes every trick in the book (to many points to make it worth it, at least IMO. i've 398whp on the dyno, stock 9 turbo, no cams before, but it had ported intake manifold, throttlebody, exhaust manifold, and pipes, exhaust etc... on e85.

Boomn29, are you running injectors and a walbro 255 fuel pump? your blog says no. and from my testing you'll be maxxed out around 310-320whp on our dyno on pump gas (race gas a little more due to timing only, but no more boost because the pump is weak). those 2 points are worth 30-40whp at least on our dyno by running e85, and definately 40-50ftlb of torque.

 

One thing you might wanna do with the splitter is bolt the lower half of the bumper to the top half. That is where i've had mine rip off. Its not really attached with more then plastic, so a few bolts will make you feel much better.

You can see the bolts in this pic. This is an 8 obviously but i figured they would be similar

 

are you accounting for the weight factor in the X for the W/P ratio? its a +.3 cause i got 431 for TTA 275/3500

 

Ive had mine stay an at RA and Brainerd at higher speeds then that but its not really angled to grab much air . Im sure you would see a lot more benefit from mounting it more secure , i havent done the bolt in method on my stock air dam just because i dont care for the looks , unless i can source a 2nd stock bumper somewhere . I still enjoy taking the occasional street cruise and such.


I hope that rotor didnt explode on course.

 

All the modifiers should be the same for any Evo. They are all 4 door's with AWD after all. So that's .4 - .5 or (-.1) in total. From there it just depends on the tire.

So a Sedan (+.4) - AWD (-.5) + 275 tires (+.4) = .3 net.

That means you can run a 'real' 8.4 ration then add the .3 modifier and be at 8.7. And 3500 / 8.4 = 416.666 Which is why I said 417 with 275's.

My model is in the 3200-3300 zero weight factor zone. So I've never figured those in. I'm not sure you add those in for base competition weights but that could be. I've never had to bother with it, so never researched it.
If so, the 3500 would net you another .3 like you mentioned. But if you can't get anywhere near that close; it's a moot point.

3500 / 8.1 = 432whp.