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Yes, especially in DI due to its latent heat capacity. The effective octane value is NOT the same in PI. Sent from my SM-G960U using Tapatalk

Just calculate pure ethanol as 160 octane, and pure methanol as 180 octane. Then you have a direct comparison of mixes depending on what gasoline octane you mix with.

Bump stops should only be included if/when you are using them as a main spring - or more so for when you do use them. That will help you understand the behavior for when they are utilized. It's a missed aspect, most people just toss them in without regard for their rate, let alone when they...

If you have an old one that you won't use again, yes. I'll be pressing out the bushings and doing some other fun stuff with them. Mazda 6 front suspension is interchangeable with the MS6, yes. The rear lowers are different due to different subframes and knuckles. The rear upper is the same.

Anyone have a set of MS6 front upper control arms they don't need anymore? I need to get some measurements. If you can bring them to Indy this weekend for me to borrow, that would be fantastic :D

Updated the 1st post

Autocross counts towards a Mazda Motorsports membership! Sent from my SM-G960U using Tapatalk

For those wanting to autocross on 9/30 in Indy, you can pre-register online to save $5 (I see a couple of you already have). If you don't know what class, that's ok - you can ask here or we can just change your class when you get to site...

Since the old clutch is out and a temp is in place, just send the entire clutch assembly back to them for inspection.

The problem with projecting onto a wall or on the ground is that it doesn't account for change in track width (scrub) through the vertical range of the wheel assembly. Using the laser line and mirror trick eliminates that issue :) Bump steer is purely a function of the suspension geometry...

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I'd take a look at bushings. In particular the trailing arm bushing in the rear. In my experience, if the bushings are severely worn, you'll get some nasty behavior like what you're talking about. If they're past their prime they'll have deep cracks in the visible surface, and some can even...

What are you guys calling "bump steer" that you are actually experiencing? Most of what you feel driving on the road is tramlining - where the wheels want to follow grooves in the road. Also, how are you measuring?

As far as I know, no one has actually measured bump steer on a 3, nor has anyone measured it with the kit. Don't assume anything about the aftermarket, lots and lots of parts don't do what you expect.