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Tracking / Autocross / HPDE / Drifting What these cars were built for! |
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12-17-2022, 12:28 PM | #29 |
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Here is my official live updated 86 weight sheet - (Google Sheets Document)
I'll be updating this sheet as I find more weight to remove. We are on track to compete within 'NASA TT5' for the 2023 season at 2,550 lb. MCW. Standby.
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12-18-2022, 02:51 PM | #30 |
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Another non-Hoosier convert?
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12-18-2022, 11:37 PM | #31 |
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Dave looks like he is saying the RC-1 is the obvious choice.
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"The vision manifests the reality." NASA TT5 Silver 2015 Subaru BRZ Limited
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04-16-2023, 03:28 AM | #32 |
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2023 NASA TT season update
This season I was able to achieve my (2,550lb) mcw in the Subaru BRZ for NASA TT5. From my understanding this is a milestone that hasn't been reached before within the US for TT/ST competition purposes. That is a pretty cool objective to claim if you ask me. Secondly, since I dropped my min weight down to 2,550 pounds (1,156kg) I was able to run the 'MAXXIS RC-1' compounds this season along with a front splitter. I decided on running the legal 255/40/17 size compounds on my 17x9's and this is what I think about the setup for this season. My personal feedback on the MAXXIS RC-1 compound So far I have put 18 heat cycles on my first ever set of MAXXIS RC-1's. I found out that the MAXXIS RC-1 compounds have a quick regressive performance fall-off trend as opposed to a progressive-proportional trend of other race compounds on the market making these compounds ideal for W2W racers and short burst sprint shootout competition such as hillclimb. I found myself avoiding tire scrub on the out laps due to maintaining cooler patch temps in order to optimize performance longevity throughout my sessions. I am going to be honest, the MAXXIS RC-1 does not care for the heat. The compounds seems to prefer a temperature threshold of between (48-76F) from my experience. (Roughly a 30 degree temperature variation window where these compounds will perform at their optimal.) In Conclusion The MAXXIS RC-1 is a solid contender to the 100tw market with loads of user feedback providing the driver with consistent control and predictability while thrashing on the absolute edge every time. The MAXXIS RC-1 is a fun predictable mule of a tire but doesn't seem to maintain its performance on a sun soaked track where drivers compete the majority of the time throughout a season. The peak grip performance is found on the out lap and tends to falls off abruptly after a few hot laps depending on the track and conditions (so try not to scrub much). The performance falloff is simply "abrupt" after a few hot laps which means TT drivers must get their flyer laps in within the first ~4 laps or its fighting an uphill battle to capitalize on the loss of grip performance to turn a fast lap after that. Who these compounds are best suited for • Super Touring (w2w) racers • Hill Climb sprinters Pros and Cons as it pertains to Time Trial competition PROS • Predictable • Slip control • Braking • Pressure variation • Longevity / wear • Life consistency (environment dependent) • High speed grip in most temperatures • Medium speed grip on cool track • Initial grip performance CONS • Acceptable steering feedback • Medium to low speed grip on hot track • Hot track performance • Rapid regressive fall-off (warm environments)
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04-16-2023, 11:15 AM | #33 |
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I've run them for a few years and I completely agree with your assessment, I am super gentle on them on the out lap and I've got a couple of laps at most. Time needs to happen in the first or second session of the day too (assuming you're already consistent on the given track).
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04-16-2023, 04:01 PM | #34 | |
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Quote:
From a comparison stand point the FA20 in the 86 falls on the lower end of the power spectrum (both HP/TQ), as it relates to the overall TT5 field. I am glad I tested the MAXXIS RC-1's this season but I am forced to revert back to a Hoosier R7 since the car demands the extra grip and consistency to contend with the high power competition. End of day I will be sacrificing wear / longevity and budget for a better overall option for the car as it stacks up in class. Revised 2023 NASA TT5 classification will reflect: • 2,750 (lb) MCW • 4'' Front splitter penalty • 225/40 Hoosier R7 • Spherical joint penalty • A-arm penalty • 257mm with weight greater than 2,749 (lb) bonus Ballast Project I teamed up with a local metal market in South Carolina to cut n punch (10qt) 1/4'' 19.1 lb plates to flatten out the R/L weight ratio. I stacked 152 (lb) of plate in the passenger compartment on the OEM reinforced seat mount location utilizing a static 8.4 (lb) 'PLANTED' seat bracket and high grade hardware. The rest of the ballast with be in the form of fuel (~60 pounds in tank) as well as bell plate in the trunk to make an effort to balance out that F/R weight distribution. A huge benefit to this setup is that the weight is placed in ideal areas of the chassis and I will no longer suffer from fuel starvation. (I am working on revising the ballast design as we speak.) (Corner balance / alignment Wednesday before I leave for NASA Mid Ohio this weekend.)
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02-10-2024, 08:02 PM | #35 |
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*UPDATE* I have plans for a motor swap this season. Still have my sights locked on NASA TT5/ST5 competition end of year.
True FA20 weight below: Here is the FA20 out of the 2015 BRZ sporting an 10lb aftermarket flywheel and OEM clutch still on the engine. Weight excludes fluids, AC compressor (+10lb) , injector covers (+5lb) and exhaust manifold (+15lb), OEM flywheel (+10lb) My FA20 weight: 315 pounds as shown OEM FA20 weight ~355-360 pounds
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"The vision manifests the reality." NASA TT5 Silver 2015 Subaru BRZ Limited
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