last one...
Our change back to 450F/175R spring rates was huge on track, just like it improved the street ride. The bad front end push we saw at Optima went away; now the car could turn-in easily and accelerate better, so this spring rate set-up stays until we find some reason to try the stiffer rates again. We had some serious rear tire rub in the rear with the 315s on the 18x12s... first from the tire to the fender lip with too much rear wheel spacer, then from the tire rubbing inboard on the stock rear swaybar with less spacer (I pulled 7mm of spacer off after the 3rd track session). The permanent fix here is to run less spacer
and remove the stock rear swaybar - by making our own rear swaybar of an all new arrangement. The stock bar routing (and all aftermarket bars follow this) will always limit inboard wheel/tire room on this chassis. More on this in a future post!
Overall, I was very pleased with the performance of the Mustang this weekend, especially compared to the dismal performance on street tires just two weeks ago. The brake booster repair, the spring rate change, and the move to wider Kumho tires transformed the car - to the tune of
5.7 seconds faster per lap. Running my 1:58.2 lap in a heavy street car like this is pretty darned quick, considering the NASA TTS track record is 1:58.4, American Iron record is 2:00, and the CMC record is 2:04.2 - and those are set in October, when it's not 100 degrees, in real race cars.
I'm going to go ahead and say this, because it was obvious to anyone that watched laps at this event:
our mildly tweaked Mustang GT was faster than anything else in attendance, other than Costas' 2200 pound, tube-framed GT-1 monster. Faster than the 2013 GT500, faster than the many Boss 302's, faster than the gutted race cars on Hoosiers (there were a surprising number on Hoosiers or Continental slicks), supercharged Lotus 7 on slicks, and on and on.
Even with a girl driving. I don't get to say that often, as there's usually a bunch of prepped race cars at some events that can always beat a real street car like this. Having the fastest Mustang at a Mustang event was pretty cool - because we're not a "Mustang shop" per se, and don't have a big power set-up on this car. It's just a bone stock 5.0 motor with
two bolt-ons.
On Monday the wing was removed, the street tires went back on, and Amy drove it to work with the AC blowing - like she does every week
So hopefully that statement doesn't offend anyone that was there, but... damn the red car was moving! Felt good to run a sub-2 minute lap at ECR again after all these years running in relatively slow cars at ECR since 2008. Major adrenaline rush, big grin for days, pulse pounding good time! And all of you reading this know exactly what we've got on this car - it is not crazy, the opposite of exotic, and we hide nothing. These 2011+ Mustangs really can get you to work and back and
still haul ass on track, with the right mix of parts. Anyone could go buy a 2011-2013 Mustang GT (spend $20-30K), copy the parts we've used, and go just as fast or faster.
It's easy. Call us - operators are standing by! ha!
It really just boils down to running big enough and sticky enough tires (people that say 315s are too big for road course use on a 3500 pound car are misinformed), the right wheels to make those fit, the proper suspension parts (which we're still improving), a little brake cooling + good pads, and a few motor bolt-ons and a tune.
One thing to mention: both cars were easy to drive fast. We've got the brakes working very well on both and this is a brake intensive track. The handling and damping on both is exceptional, and this is a bumpy/shock intensive track. True, Amy and I both have many laps at this track (I probably have 20-25 hours on track at ECR) so that helps, but neither of us is some driving savant (look no further than my BMW mega-off at this event for proof of that). Sure, my times are a little quicker than Amy in the higher powered Mustang, but I have a lot more seat time in this car and
just ran this car it at this same track two weeks ago; she has never run the Mustang at ECR. Racing these cars was relatively easy, and if it weren't for the lingering steering shudder (that only seems to affect our car this badly) it would have been a completely stress free drive. I missed having a good race seat to keep me planted in place in the BMW, and I let the Hoosier's tendencies to overheat in 100°F conditions sneak up and bite me, but otherwise it was a breeze. I will also note that
driving the Mustang on R compounds at a 1:58.2 pace was much easier than sliding around on street tires doing no better than 2:03.9! There was a complete absence of hooning in the Mustang this time around. Hooning is hard work...
What's Next?
We've cancelled all previously planned track and autocross outings for the month of July, for a few reasons. One, because it iss freagin' HOT in Texas from now until August; many of our local racing clubs stop having events from June-August.
Today it was 108°F in Dallas and it will be in the triple digits all week. Those are
miserable conditions to race in. We could see 30-60 days of over 100, easily. Amy and I got a touch of heat exhaustion at the Optima weekend, and got another round at this past weekend's ECR events, so we need time to recover. We spent last Sunday in pain, trying to get fluids and electrolytes back into our systems. Once you get heat exhaustion it is too easy to "re-get it", so we need a break.
Also, there are some lingering repairs we might finally be able to fix on the Mustang - like the stupid freagin' steering rack! Just heard that these are scheduled to be back in stock June 29th - so we've got one on pre-order (along with a T2R!). Upon inspection on Monday, it appears that the
rear brake caliper piston dust seals are now fried, too, but the fronts still look fine. We'll get some new rear seals coming and swap those. Considering how many autocross and track hours of abuse this car has seen in... coming up on two years, this is a pretty good lifespan for dust seals.
Tire rub sucks! I am damned tired of this condition making the handling intermittent and weird. We are finally going to remedy this.
Lastly, we have a list of new parts to design, build and develop for the S197 Mustang. Going to too many races lately has delayed this considerably. The stock-style rear swaybar flat
will not work with a 315mm tire under stock fenders, and it has to be replaced. I refuse to go to smaller rear tires just because Ford routes the swaybar in an inefficient manner. If we can keep the car off of a race track for a few weeks we can build the custom, splined-tubular steel rear swaybar set-up we've been meaning to make for the last year (we now have pieces coming to make this). This will allow the 315mm rear tire to finally fit inside the fenders under heavy lateral loading (it has 1" of clearance now to the bar, but under load the tire is still hitting the rear swaybar). I cannot remember an event yet where the
rear tires haven't been rubbing on something - that has to stop. We're trying to make a very tunable rear bar that can work for both semi-serious track/street cars as well as dedicated track cars, so there are some modular bits to work out. We also really want to make a better Watts link than we've seen offered - something that is beyond the "Bolt on Billy" crowd. No bling, less weight, just a new design that has better lateral location and tunable roll center without the need to be 100% "bolt-on".
It might be a month before I update this thread again. We have a LOT going on at Vorshlag HQ, including
three job openings, and four other major project cars that have been getting worked on in the past month - and another LS1 swap chassis we're adding to the already large array of BMW chassis we've tackled. The E36 LS1 swap kits are selling like mad, with three kits sold in the past three days - and people still don't know about half the sub-system kits we've added in the past quarter (which aren't even on the website yet), not to mention the ones we're about to release.
In any case, I better wrap this up. Once again, thanks for reading!
Cheers,