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Figured I might try to start a thread since this is where the cool kids hang out.
The car: 91 CSP "ish" miata. Ish because the motor is the "wrong" motor for the class, a lightly refreshed BP4W from an unknown mileage but very trashed NB I bought for $300. Shocks are non-adjustable Whitener Racing shocks (revalved billies.) Lots of little details and bolt ons.
While the car is a blast to drive, I admittedly suck as a driver and somewhat suck as a builder. I'm working toward fixing both; however with 2 young kids at home (my son was born in the middle of last season) the biggest constraint has always been 1.) money and 2.) time.
In any event, after saving and collecting parts for 2 years I was a few days away from taking a spare (but somewhat trashed) vvt motor to a machine shop for a real CSP engine build when the SCCA announced a new class... XS-B.
I can't run a full season of national tour racing, instead focusing on locals (Toledo native, so we usually have a good site) and regional racing. For lots of reasons (which I will share later) the new class seemed like a good fit, so I did a quick "pause" on the motor build to shuffle things around.
If nothing else, I'm guessing this is the first XS-B post as the class is officially less than a week old.
The plan for now: build the VVT engine with a few extras, swap some of the CSP stuff over to my daily NB, and essentially build a "80%" car for the first year while the rules get sorted out.
Also, plans include asking lots of questions and hopefully quality seat time getting the car set up on street tires. Given the family situation, eliminating trailer loading / unloading time - even if only 3-4 hours per weekend, will hopefully free up more time for setup changes.
Interested in the thread from the aspect of XS-B classing.
I have ran my car locally (admittedly illegally technically) in the CSP class. My aero (splitter size, 2D airfoil, and barge boards) basically is what threw me into the class otherwise I had a bone stock BP4W powertrain with the MT.net approved Supermiata BGK suspension setup, 245 RS4's on 10's, and track approved safety equipment for both passenger and driver in an otherwise 100% complete interior. Car weighed 2278 in this trim with full tank. Nobody cared that I ran it in CSP due to the horrible index and the fact that true CSP cars would mop the floor on my car. I was out having fun chasing RAW times.
Moving forward this year, I'll have the K24A2 swap with all the same items as before. In conjunction with a few new updates and not running at a full tank, I think there is line of sight to be right at minimum weight (2150) for the XS-B with ~230whp... it surely won't be the best prepped for the class, but it shouldn't be the worst either.
Ah glad to see the bench racing champion of BG finally made a MT build thread. Where are the HHR Contingency stickers though?
Matt, it seems a K swap Miata is the go-to for XS-B based on what I can read from the rules. I'm not a huge fan of cone racing but its nice to see a catch-all class for some of the more extreme cars out there.
Matt, it seems a K swap Miata is the go-to for XS-B based on what I can read from the rules. I'm not a huge fan of cone racing but its nice to see a catch-all class for some of the more extreme cars out there.
Kswap will be a starting point, but there's no regulations on power level so in theory someone could have a 400whp miata or any other combo of swapped high power AWD insanity to compete against. I'm not counting on anything. I'm also not a huge cone racing fan either which is why my car doesn't follow a solo rulebook at all, but it is cheap, I have a lot of friends that do it, and its a nice way to dial in a suspension setup before spending money at big track. I just think its neat that my car finally can fall into a class where Hoosiers aren't the reason, I'm getting murdered on times.
I'm curious to see how these two XS classes will go. I figure for the first couple of seasons it will be fast SM/SSM cars on street-tires getting it done. But once people start building to this rule-set it could get pretty wild..... XP type builds I suppose.
If I were you I would stick with CSP. When I started CSP, I slapped a set of xidas and hoosier on a NA8 and that's basically it. The car was a blast and far better than it would be on 245 skreets. It was also close to the level of my car now with a VVT, aero, etc. If you plan on towing, forget about the engine, get on the purple crack, have fun.
Great looking CSP car! I'm interested to see what the local turnout & prep level will be for these new XS classes. While not as fast as a set of 275 A7's, I still have a ton of fun driving my CSP car on 245 Rivals (especially for smaller events/lots). I found that the setup was relatively close when switching between race and street tires - just have to soften things up a bit.
Any big power or weight loss plans for the immediate future?
A few years back I picked up a minty, low mileage NB1. It had never seen rain, was supercharged with a m45 but was otherwise stock. My thought process was to sell the motor and supercharger and have a very clean starting point for CSP; however, it was just too nice to cut up and I already had most of the parts to build the na for CSP.
The short version is that an 80% SP/P/M build does not have a place in local events. I've had events where I won the class with 3 cones. We have a local index class, but at 80% build (and 60% driver) I'm an also ran when it comes to calculator racing. I might have a good scratch time, but we had something like 23 national trophy winners in our region last year. Billy Davis and Neal Tovsen have done nothing to help my PAX. This year my index got harder while some of the fast guys got even softer...
So I sold the engine out of the NB, then used the money plus a couple of years of saving to fund a VVT engine build. With most of the parts already ordered I was a few days away from taking it to the machine shop when the SCCA announced XS. I needed some additional dial in for the suspension (pyrometer indicated that the rears had a bit too much camber and I later discovered the front sway bar was not the stiffness I thought it was, hence some weird handling.)
My concern is that the new, supplemental classes will siphon people away from SP/P/SM classes. SO... I'm not sure. I still need to build the engine and a low compression build doesn't really make sense for autoX... for now, though, I think the plan is to double dip CSP and XS by throwing a set of 245s on my 10s. If the class takes off I suspect 250-300 whp is about the limit of 245 street tires. At that point a TSE 6258 really makes sense.
For weight.. my car is already under weight for XS. I'll need to throw it on the scales once I have the new engine in but I'm probably going to need to ballast. With the addition of the turbo and FM bracing I might STILL need to ballast, but we'll cross that bridge at a later date.
I have less than zero desire to run a car like mine on street tires, but my car fits the rules and I have a set of 15x10" wheels already.
I am hopeful that this class can help us make a case to get a 275mm wide street tire built which will fit into my ultimate goal of running one lap of America with my car.
That said, I do plan on having the wheels and tires with me at a few events and if we end up with 3 or 4 drivers in the car, I might run it there just to see. I'll just set the traction control to be a tad more invasive and see what happens.
I am hopeful that this class can help us make a case to get a 275mm wide street tire built which will fit into my ultimate goal of running one lap of America with my car.
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As much as I'd like to do the same, there's also the problem of still needing an engine for this season. The current CSP engine is already spoken for (in my own daily, so I can't really bail on myself.)
was really hoping to see the RE71-RS available in a 245/15 but that didn't happen for this year. Maybe this class will change that?
One of my personal goals for the year was to pay down the credit card debt, so jumping into the longer term plan (EFR, 6 speed, Aero & ABS conversion) might be the reward once that goal is accomplished.
At least when traveling out of region, jumping into XSB might help level the playing field. Running on Hoosiers against skreet tar cars is kind of meh.
If it wasn't for only having 245 tires I would say the miata would be the car to have in XSb. I wonder if something like a s2000 shows up on some 3xx 200tw tire how the miata would compare.
I guess if you were going full XSb you could swap to 5 lug hubs and run the big street tires.
I guess if you were going full XSb you could swap to 5 lug hubs and run the big street tires.
In terms of current tire availability, that would require jumping to a larger diameter wheel. I'm not sure that isa realistic option in a na chassis where the 275/35/15 HoHos rub everywhere.
That said, I'd run a 275 street tire if there was one.
In terms of current tire availability, that would require jumping to a larger diameter wheel. I'm not sure that isa realistic option in a na chassis where the 275/35/15 HoHos rub everywhere.
That said, I'd run a 275 street tire if there was one.
From someone that runs 295s, I understand the difficulty of running a larger wheel/tire. But:
"Frame/chassis may be modified including suspension attachment points. Alternate subframes (K-members) are allowed. Vehicle perimeter and wheelbase must be full-scale to the original model. Incidental wheelbase changes resulting from suspension changes are permitted. This is not an allowance to shorten or lengthen the chassis/body (e.g., change the scale from the original)."
Or maybe an NC is the right miata for the job. I think they fit bigger tires. There is definitely a rabbit hole to go down with this class, it's just a question of if anyone will. If cam is any reflection, I think this class will be good for most regions. The exception being when guys like TNTUBA show up on skreets and ruin it for everybody.
Heck it has me considering an NC (2.5+turbo) for street duty since it would have a place to play.
Looks like I might need to change the thread title from: XS-B to..
Staying in CSP, but maybe jumping to DP later.
Over the weekend I dropped off the VVT bottom end to have it gone through. The motor was basically a freebie but its also been in my garage for over 2 years. There was some pretty serious carbon buildup on the pistons so, at least for now, it will get a basic tear down, inspection and cleanup. New gaskets, rings and ARP hardware, plus the flywheel will be balanced to the rotating assembly.
Love the K24/Quaife combination! While it was impressive to see you kill it at SLB this type of build is closer to your racing roots. Great build strategy!
Just saw this thread. I ran XSB last year...made it work with my turbo setup. Great class. Will likely be a shootout between me and a K24 Miata this season.
01-28-2020, 07:46 PM
XS-B? Wtf.
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