Since you don't drag race your car you'll really have no way of quantifying to me how much more the vehicle accelerates from the change. Even if you did drag race... the data would be useless since we've introduced the human element. I'm guessing you also don't have an accelerometer in your vehicle (AIM datalogger?) so you also can't tell me what the difference was. There for... I asked you if you can "feel" a difference since you most likely don't have the sensors nor the logging capability to make a quantitative analysis.

I know there will be a difference from weight loss, but I'm curious as to how much the rotational inertia of the rotor changes with their 2pc. design since the top hat is aluminum and doesn't reduce the inertia of the rotor by a "significant" amount. This data is not published, although I would *HOPE* that it was calculated before hand.

NOTE: I'm only concerned about accelerating the brake rotor in a straight line.

 

When i switched to PF 2pc rotors i didn't feel any difference in acceleration.

although gaining acceleration is not really the point of 2pc rotors

 

Damn sweet. I just read 50 pages and I'm amazed.

 

I thought it was so that you could show people that you had NAS hardware on your vehicle?

 

haha, i guess that could be part of it. they are pretty ....

 

Just so evom don't have misunderstandings about how PCA operates. I'm in no way a "cheerleader," I've simply been around it forever as I've driven and raced with PCA for years, and I love my evo . It really boils down to your attitude in PCA events. Granted they are a proud club, and have every right to be, hell most of us would have a Porsche instead if we could only afford it, and afford to mod it. First thing that will happen is they'll come up to you in the pits with curious looks on their faces, just be respectful, make em laugh, tell em it's a shakedown run and/or call it your "poor man's Porsche," and you'll be golden. On-track, just be polite on approach and give them the chance to point you by safely, most of them are not there to break records, but to have fun and get home safe as you already know. Granted you will have guys who are REALLY good and like to have fun, and you'll also have n00bs who won't point by very often, most of you with experience know the difference and what to do.

Far as rules are concerned, again it's about how you blend in and your attitude. Officially you can't have visual timing equipment. Two obvious points there - it "makes you race yourself, and potentially drive past your limit" and it "distracts you from driving, because your looking down or up or to the side at a clock." I think it was adopted after some complaints, understandable, it is what it is. Simply unplug your trackmate's gauge or hide whatever other equipment your have and view it afterwards, simple. For the belts, that was adopted after several instructors bit the dust in other events after the "trainee" wrecked. The "trainee" had a harness, the instructor did not, and the instructor died (this is NOT referring to any specific event and is in no way meant to be seen as such). It's also more respectful to think of your instructor's safety too, makes sense no?

**** rules? Yes. Safest club to run with? By lightyears. Cheap/Fun factor? 11/10.

Can't wait to hear your results. I'm sure ALL this effort will be worth the world itself. Get pics too if they got a track photo guy!

 

Don't forget to wave and smile as you pass the GT3's...it will make them feel better I kid...some video would do justice though.

 

Affordable ($200 to $300) logging G-meter, you have to enter an accurate weight of the vehicle

http://www.gtechpro.com/

aluminum hats give a small weight loss, but that's what racing is about.

est. 1 lbs at each wheel, 4 lbs total rotating weight is worth about 4 times normal weight. So about 16 lbs.

 

I don't think you understand the concept of inertia.

 

I find vbox much more accurate. High speed gps no vehicle weight needs to be entered.

http://www.vboxusa.com/performancedrift/

Nice thread jid2.. good luck.

 

Lots to say. Probably wait til tomorrow to go over it and add pics.

- I do have accelerometers in the car. I have full GPS data logging, Traqmate is what it's called. That said Dave Buschur dynoed a car before and after with light rotors and it made no difference.

- The PCA guys were awesome, I was very happy with how they ran the day. They did a good job - I've got no problems with how they roll now that I've seen it first hand. I left the Traqmate in my bag and didn't bother being sneaky. They said don't time in the drivers meeting, and I respected their request.

- I wanted to sell my car, or shoot it after the first session - I was super bumbed. The Forge BOV in conjunction with the 2.3L and turbo was an absolute surge/bucking machine. The session was crowed and required lots of part throttle. The car was completely out of control, literally shaking itself to death from surging. I couldn't focus it was so bad. Add to that it had been a year since I've been on this track, and I couldn't "buy" the line. Sure I know where it is, but I couldn't hit an apex to save my friggin life. I was supposed to just be getting a check ride- hah, I was worse than a noob.

- Put my stock plastic BOV in after the first session. Solved all the surge issues.

- Spent the rest of the day driving mellow and finding the line again because after that first session crap fest I could see how rusty/lame I was driving. Sorry to say I let way more people past me then the other way around.

- This car is way faster than I can drive it right now. On the stock turbo on pump gas I was OK, and could drive wide open most everywhere. Now there's just too much speed available. Ever build a car on Playstation or Xbox with every power upgrade and then it goes so fast you always just wreck it at every corner - I feel like that. I need way more seat time to get used to this beast.

 

Drooling at all those parts!!

 

Nice recap of the day!

I'm still laughing out loud at your surge issues since I was just helping a friend tune his 2.3 / red yesterday and my god low rpm + high gear holy smokes its bad. He is on a forge and is thinking of switching to a stock IX bov.

Hope you get the car behaving exactly how you want. I know it can be hard to do at times.

 

Yup, time to play catchup. I'm in the same boat but with everything else besides the motor. Seat time FTW. Forge FTL. I had a forge too and part throttle p0wnd me on one track day, and that sum bish went into the trash can. I even tried different spring combos but in the end it's junk. I went and got Works BOV and couldn't be happier, the boost is just...there.

 

pics or mutiny!!

Glad to hear you had a great time. you definitely deserve it.