DocWalt's 2022 WRB BRZ

[autoracer86]

yeah amazing job

[DocWalt]

My first event in "XA" prep, against at least one real XA car too! The car feels great still, literally only softened the front bar for the less grippy site. I think the wing starts to help a little at high speeds, the car seemed a bit more stable at the ends of slaloms which were the only higher speed sections on yesterday's course. I'm going to struggle against the top XA cars without power, my plans for next year should get corner speeds up more and hopefully make up some of the difference there.



My fastest clean run:

My faster but dirty run (not sure where the cone was and nobody else seemed to know where either):

Philly SCCA does a neat thing where the Top 5 drivers in points get to drive two random cars for two runs each and your fastest run in each car is summed. I won this competition again, the third time in a row

[RedReplicant]

I can believe the wing does something. I was kind of surprised going from my Verus high efficiency at 0 AoA to removed in back to back sessions, it made a noticeable difference over 45mph even though the DF numbers aren't that high.

Car looks great and nice work on the car mixup thing at the end, that is a cool idea

edit: First run looked pretty fun lol

[DocWalt]

I definitely want to test with the wing on or off at a site with higher speeds. I'd love to try on track too for sure.

I also need to measure the AoA change between the two settings on the wing.


Thanks! The car mixup thing is super fun, but you definitely need to have trusting folks, haha.

[DocWalt]

Installed the Jackson Racing Dual Cooler and deleted the factory heat exchanger. I was able to use one of the stock heat exchanger hoses to bypass between the two nipples that fed the stock heat exchanger, it was just long enough to not kink, haha.

[autoracer86]

So I have to ask. Why did you remove the stock heat exchanger ? Seems to be 50/50 based off the YouTube install videos I seen

[DocWalt]

Originally Posted by autoracer86

So I have to ask. Why did you remove the stock heat exchanger ? Seems to be 50/50 based off the YouTube install videos I seen

Ansix Auto reported a good deal of pressure drop with the stock heat exchanger in place with an oil cooler kit stacked on it and it seemed to be backed up with the data they shared.

I also bought a used first gen kit (with a brand new core) so the lines were designed for the first gen and that meant they had the wrong ends to fit with the heat exchanger in place.


I'll be logging to see if my oil temps take longer to warm up, I suspect they will. That was the big benefit to the stock heat exchanger, IMO.

[autoracer86]

Originally Posted by DocWalt

Ansix Auto reported a good deal of pressure drop with the stock heat exchanger in place with an oil cooler kit stacked on it and it seemed to be backed up with the data they shared.

I also bought a used first gen kit (with a brand new core) so the lines were designed for the first gen and that meant they had the wrong ends to fit with the heat exchanger in place.


I'll be logging to see if my oil temps take longer to warm up, I suspect they will. That was the big benefit to the stock heat exchanger, IMO.

yeah I think a more traditional style oil cooler works better with the stock heat exchanger in terms of pressure drop. Yeah keep us posted on the data

Are you logging oil pressure as well ?

[DocWalt]

I am not... yet?

I've thought about how I want to do it and I just haven't really had the time or energy to commit to it yet, haha. I want to build something simple (Arduino?) that wires directly to the second CAN port on my RaceCapture so I don't need to do much brain power wise adding a new CAN ID to the stock CAN bus, that seems like more risk than I want to take messing that up.

[autoracer86]

Originally Posted by DocWalt

I am not... yet?

I've thought about how I want to do it and I just haven't really had the time or energy to commit to it yet, haha. I want to build something simple (Arduino?) that wires directly to the second CAN port on my RaceCapture so I don't need to do much brain power wise adding a new CAN ID to the stock CAN bus, that seems like more risk than I want to take messing that up.

Step 1 Sell RaceCapture Step 2 Buy a bunch of expensive AIM hardware

EASY

Your plan does sound very cool though. Not sure I would say simple lol but a cool fun project for sure

[blsfrs]

I am curious to hear about your experience with the JR dual rad. I assume you run an op gauge. Let use know how your pressures run.

[DocWalt]

Some data on temps so far:

Before I cut the hood, I saw coolant temps regularly in the mid 190s (Farenheit) and oil temps would heat quickly to 120+ by the first on ramp on my morning commute, plateauing at 210 on the street. Coolant temps peaked at ~201F at autocross but mostly in the upper 190s. Oil temps would peak in the mid 230s in a single autocross run, dropping back down again to low 200s by the next run.

With the hood vent, coolant temps were solidly in the low 190s on the street and they'd be in the mid 190s at autocross. Oil temps seemed to behave identically.

With the rain tray installed on the hood vent, the coolant temps would be in the low-mid 190s, like 192-194 F. Oil temps still identical.

Today, coolant temps were definitely a little slower to warm up and plateaued solidly in the 187-192F range even with the rain tray on the hood vent. Oil temps were lagging ~10 degrees F behind "normal" initially (it *just* hit 120F entering my morning commute on ramp) but then took AGES to get to 185 F and then it was stable there excepting when I peaked it at 194 F after ripping my favorite 270 degree off ramp at 60-80 mph in 3rd gear. It quickly dropped back down into the mid 180s. The oil temps are definitely slower to warm up than the OEM heat exchanger, but way quicker than an air/oil cooler even thermostatically controlled like I had on my first gen.

[dragoontwo]

When are you going to start selling some hood vents? Also, are they UV and temp stable?

[DocWalt]

Originally Posted by dragoontwo

When are you going to start selling some hood vents? Also, are they UV and temp stable?

Working on some now for someone Made some tweaks for NASA legality and I'm printing them in ASA so I know they're UV and temp stable.

The Nylon 12 CF *may not* be UV stable (Nylon is not, but with UV protection additives and the CF fiber it may be "fine") but has been totally temp stable for me even intentionally letting the car heat soak between autocross runs with the hood closed and engine running. Obviously the vent lets a lot of heat out, haha.


I'm trying to not fall afoul of vendor rules or anything of the sort and still mostly doing it for fun.