GSpeed's 2015 BRZ- SCCA Super Touring Build

[GSpeed]

Here’s a plot showing three fast laps from the last month.

Blue- Yesterday’s second morning session. 1:27.2
Orange- July 30th morning session. 1:26.4. RE71Rs & Tarmac 2s
Green- July 18th morning session. 1:28.1. RE71Rs & stock suspension

Smooth lines are speed, and the noisy lines are lateral acceleration. Track surface temps from yesterday were within a few degrees of the other runs, and actually cooler than the session on the 30th. So it shouldn’t be an issue with the tires being on a hotter track.

We were developing higher lateral loads through the longer corners on the “orange” lap. The second smaller plot at the bottom of the graph shows time differential from the fastest lap, and you can see we’ve got the highest increases in time through those same corners where “orange” was developing more grip.

I think this pretty clearly shows the tires are slowing down, and are negating any benefits we might see from the Tarmac 2s and swaybars. Fresh tires are on the way!

[Bramick]

Thoughts about environmental factors, like increased summer heat?

[Bramick]

^^^ ignore. I clearly can't read

[GSpeed]

No worries, it was a legitimate question. Here's the average temps per session, as measured by the IR sensor looking at the track:

July 18th- 94.2°
July 30th- 108.5°
Aug 7th- 108.5°

So yeah. They were the exact same average temperature, down to the third decimal place. Some sections of the track were cooler on the Aug 7th session than they were on the July 30th session, and vise versa. Not enough deviation to explain any of those thermal variations in the tires, though.

[IPGJames]

Interesting stuff ... I will be following along

[strat61caster]

Finally got through it, I'm getting some insight into that tire thread, awesome deal with all the data collecting and a huge thumbs up for publishing anything at all.

Personal thought: the camber plates will be the most effective upgrade you've done since the tires. Will you be testing them on your old or new tires? Would be interesting to see (and would keep the data within family to your most recent test with the swaybars and coilover)

Seriously though, camber. I've read some guys are running over -3 and I can personally vouch that it transformed my car from an understeering pig to the balanced machine all the magazines claimed it was.

Best of luck, look forward to the results!

[GSpeed]

Finally installed a Perrin oil cooler, so our 280° oil temps will be a thing of the past! (At least for now...)

In our spare time, we've been working on a gas pedal relocation mount. The stock pedal position leaves a little to be desired, so we've moved it a little closer to the driver, and a tad closer to the brakes. By bringing the pedal closer to the driver, you're able to get a more confident toe position for heel-toe work by keeping your foot more "on top" of the pedal, with less risk of falling off the side.

Here's a picture of the proof of concept we machined in house on a manual mill. The production ones will be CNC machined and pocketed, and a good deal lighter.





Be watching for a group buy for the first run of these guys. Thanks to @ichitaka05 for the idea.

Here's a teaser shot of the camber plates we'll be running. They appear to be very well made. We can't say whose they are yet, but they're designed to be very affordable.

[Jonsey]

So I will bite. What do you guys like about these camber plates that others don't offer?


Put me on the list for the pedal kit.

[GSpeed]

Originally Posted by Jonsey

So I will bite. What do you guys like about these camber plates that others don't offer?

Honestly? They were free. This company has a history of well-designed and engineered parts, and they asked us to test them out on track. They seem to be a great bang-for-your-buck part to add an effective amount of camber.

That being said, they know we won't pull any punches with what we learn. If we don't like something about them, we'll be frank. They're putting themselves out there by giving us these and having us review them, so we've got to respect that.

We have a policy of not putting parts on our car that we wouldn't feel comfortable putting on a customer's car, regardless of price or incentives. These pass that test.

[ichitaka05]

Glad to see you're working on pedal relocation mount. I'll be interested to see how much difference it makes.

Edit: Also I want add few other things after reading all the posts here. It's very good info is written here and I hope all other members read this thread.

Just my 2 things:
1. 225 vs 245 is up to which track. I've heard both great on track putting down better time than other one. You might need to test 225 to see if it gets better time. My local 86/BRZ track geeks are getting better time w 225 instead of 245.
2. From few other engineers (Cusco, AVO & so on) have been testing out different sway bar stiffness/size. For several reasons, but majorly this car great a lot of common track answers. Bigger isn't always better. Stiffer isn't always better. There have been a lot of test have been going on and more to come.

Please keep up the awesome work

[civicdrivr]

Definitely interested in that pedal relocation bracket.

[Jonsey]

The track they are testing on is very technical with short straights and favors grip over power, so in this instance I don't think the 225s are the better choice. The top speed for me on this track is 103-105. Part of why I love it, the vettes and porsches don't have such an advantage.

Originally Posted by ichitaka05

Glad to see you're working on pedal relocation mount. I'll be interested to see how much difference it makes.

Edit: Also I want add few other things after reading all the posts here. It's very good info is written here and I hope all other members read this thread.

Just my 2 things:
1. 225 vs 245 is up to which track. I've heard both great on track putting down better time than other one. You might need to test 225 to see if it gets better time. My local 86/BRZ track geeks are getting better time w 225 instead of 245.
2. From few other engineers (Cusco, AVO & so on) have been testing out different sway bar stiffness/size. For several reasons, but majorly this car great a lot of common track answers. Bigger isn't always better. Stiffer isn't always better. There have been a lot of test have been going on and more to come.

Please keep up the awesome work

[solidONE]

Originally Posted by PST

Here's a teaser shot of the camber plates we'll be running. They appear to be very well made. We can't say whose they are yet, but they're designed to be very affordable.

Doesnt look like there is any caster built in these. Might want to do that if these guys are still pre-production. That would be one major consideration besides the price and quality for myself.

[DaiTT500]

I don't know if I missed it but instead of the pedal relocation, why not use the cusco pedal extension? Is there a disadvantage of that?