Nicks Comprehensive 86 Build - Weight Savings

[Nick Dugdale]

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.

[RedReplicant]

Another non-Hoosier convert?

[Nick Dugdale]

Originally Posted by RedReplicant

Another non-Hoosier convert?

Dave looks like he is saying the RC-1 is the obvious choice.

[Nick Dugdale]

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)

[RedReplicant]

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).

[Nick Dugdale]

Originally Posted by RedReplicant

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).

The MAXXIS RC-1's are great compounds for the money. I just wished they worked for my driving style and overall class setup especially running in warmer climates.

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.)

[Nick Dugdale]

*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