Fair point. @2012Boss302 does refer to dragging but if that is the case it seems odd that both rear calipers are dragging equally, plus according to his inspection nothing is amiss and the rears have even temp and rear. Dragging or not, the evidence is that the rear brakes are getting hotter...

I may be misinterpreting it but that is how I read the first two sentences of the first post together with post #8, "I'm pretty sure the rear are hanging up." You are correct, the post does not say "consistently" but that is how I read it.

Traction control on or not the rear brakes should not be consistently locking up before the fronts, that is dangerous.

There are lots of reports of the S550 front 6 piston calipers leading to a soft brake pedal when used with the S197 master cylinder. I wonder if your setup is leading to a front rear brake balance issue, where on braking you are effectively pressurizing the rear calipers more than the front...

I doubt it’s the springs. I used to run variable rate FRPP P springs with 305/30/19, no spacers, and no rubbing. Dumb question but the liner is secure and tight against the body of the car, correct? Did you make any adjustments on the rear LCA’s? The axle and wheels are centered front to rear?

I agree with both of you and run Cortex 400 F and 200 rear with an 18 mm or no rear bar, Eibach adjustable 35 mm front bar. No aero.Oh, and the car I have the most nostalgia for was my old A1 Callaway GTI, loved that thing.

No, sorry. I feel like I don't have much to report but I guess I should do one.

@twistedneck This isn't your precise setup but on my '11 GT I have the Cortex Koni coilovers with their offset strut and run SVR LME 19x11 with 50 mm offset, usually with a 305/30/19 Goodyear SC3R. With that setup the tire just barely rubs the front strut housing with no spacer. No rubbing in...

3-2-1, I was referring to the gen3 shortblock, gen2 heads, gen1 timing combo. I have a 2011 that is a street/hpde car not a dedicated track car. I like the look of these combo motors with gen3 shortblock but I would want the flexibility of running pump gas without having to change everything...

@Mad Hatter this is very interesting and helpful information, thank you for sharing. Is it not safe to run a 3-2-1 motor on track with pump gas, or is it more a matter of using E85 or race gas to optimize the setup?

Scary. Glad you’re ok, thoughts and prayers for your whole community.

I would start by replacing the fuel pump. Remember that the fuel filter is a "lifetime" part built into the in-tank fuel pump and is non-serviceable. It gets dirty and clogged like any filter but the only way to replace it is to replace the whole pump assembly. I broke apart my old fuel pump...

Set up right, putting power down off the apex is the S197's secret weapon. Google the Phoenix cars if you haven't already. Awesome stuff.I agree with others here that a torsen/eaton is definitely better than a trac lock. @RodS197's description is how I feel about mine and I agree that if...

I'm not understanding this comment. An Eaton or Torsen won't lock up both wheels either, quite the opposite, no? I think that is their biggest advantage.

@ShifterX I went from a functioning OEM trac loc to an Eaton in my 2011 GT. Similar to you, I usually run in advance level HPDE and my car is daily street driven.In that context, I found the Eaton to be a noticeable but not transformational improvement. My lap times before and after were...