GSpeed's 2015 BRZ- SCCA Super Touring Build

[GSpeed]

Not sure the AC Delete pulley will be cost-effective, so that's being shelved for now. On to more interesting things, like dissecting the Edelbrock E-Force blower!



First impressions- it's a really well made kit. Instructions are SUPER thorough, and the machining seems to be decent, and very well suited for the job. Noticed the castings for the left and right runners are identical. Nice clever piece of engineering to save mold costs, and it gives us an extra place to put an air temp sensor!





Runners come off with no drama, and they're located with a small dowel. Nice little touch to ensure everything lines up.



Next, off comes the blower. The intercooler core is siliconed into the hat to ensure ALL the air flows through the core and not around.



There's definitely not much room between the intercooler and the blower. Going to make fitting an air temp sensor in there pretty challenging.



Blower rotors have a nice ceramic coating.



Check out the gap between the blower hat and the intercooler core. Not much room for airflow there, it's impressive this thing makes the power it does. If you notice in the first picture, there's some machining on the bottom of the supercharger to get it as close to the engine as possible. They're really using every last inch of vertical space. Based on our experience with CTS-Vs and Z06/ZR1s, there's probably another 50 hp in a new blower hat design, at least. But then you wouldn't be able to fit the hood on the car.



Strapped one of the runner pairs to the Bridgeport to machine it for an air temp sensor.



If we hadn't voided our warranty on this kit, we certainly have now.



Nice, clean M12 hole for the Bosch air temp sensor we'll be adding. Sure was nice of Edelbrock to leave us a spare sensor boss for an aftermarket air temp sensor.

We should have our sensors showing up this week. Already got the Aim Channel Expanders mounted and wired under the hood, so it should be pretty straightforward to hook everything up.

Stay tuned!

Jake

[CSG Mike]

I love this thread.

[GSpeed]

Finally got around to installing what we're calling the IAT2 sensor today. It was a little... unorthodox.

First step was to take a piece of aluminum plate, transfer punch some holes from the supercharger, and drill and tap some M8 threads.



The blower was taped and paper toweled within an inch of its life to make sure nothing got inside.



Then, the plate was clamped in the vice on the Bridgeport knee mill. We BARELY had enough vertical travel. Had to use collets and fractional drills, there wasn't room for a drill chuck. Thankfully the drill diameter for M6 x 1.0 was close enough to 3/16" we were able to get away with it.



We had to walk down carefully with a 3/4" end mill since it's not the stiffest of fixtures, but we were able to mill enough material away to where the sealing washer had a good surface, and the sensing element was all the way into the inner chamber.



It barely sticks into the chamber, and we were able to leave the inner rib mostly intact. I'd thought we might have to grind it out, but I'd much prefer to leave it there for structural reasons. It would be better for airflow if it was gone, sure, but the airflow in this area is already super turbulent. Should be fine. (Famous last words, right?)



Here's how it looks from the outside with the supercharger reassembled.



And the air temp sensor in runner #1.



We're planning on going on track this weekend, so we decided to install the Subaru OEM AC Delete kit and see how it does. The bearing isn't impressive at all, as previously mentioned, but some people have been running it with no issues. We designed and priced out a dual-bearing pulley, but it likely won't be cost-effective unless this one is just absolutely horrible.



Fitment is spot-on, like you'd expect from an OEM part.





Thanks for reading!

Jake

[philooo]

As usual the cleanest work on any track brz so far, at least document work...
The details are just a joy to watch, if this car is ever for sale, that documentation will hopefully bring some good money back to the owner.

[BigFatFlip]

Originally Posted by GSpeed

We're planning on going on track this weekend, so we decided to install the Subaru OEM AC Delete kit and see how it does.

Thanks for reading!

Jake

Looking forward to finally having some Edelbrock track data. Make sure to cross post with the owner's thread!

[Jonsey]

This is essentially the owner's thread, FYI.

Originally Posted by BigFatFlip

Looking forward to finally having some Edelbrock track data. Make sure to cross post with the owner's thread!

[GSpeed]

Originally Posted by Jonsey

This is essentially the owner's thread, FYI.

I think he means the Edelbrock Owner's thread.

To which, yes, I will, but we still want people reading this thread too. At the very least, I'll post in that thread any time we have a significant update.

[GSpeed]

So we decided to try a cast oil pan from Full Blown Motorsports @FullBlown to try and cheaply address the oil pressure problems mid-cornering. Looks like a good piece, and for the price it was worth a try.



So, put it on, and notice the heat shield around the OEM header won't fit. Hm.



And, it hits the turbo inlet fitting they added.



And the front of the pan.

So, that's a little disappointing. The listing (link) didn't say anything about NOT fitting the OEM header, which I would think would go without saying.

[GSpeed]

Today was a good day. Know why? Because we got to go racing.



Even when you're not the fastest guy out there (by a long shot, sometimes), it's still tons of fun. We ran one session with the RE71Rs and ran a 1:25.2. We had softened up the rear bar one spot (now full soft) and it all but did away with the oversteer.



Then we switched to Hoosier R7s. Didn't pick up quite as much time as we'd hoped, but managed a 1:24.7. So, half a second. Definitely feels like the stock brakes aren't up to task anymore, so the AP brakes will be going on next.

Here's a video from in the car of the fast lap:

[ame="https://www.youtube.com/watch?v=qFCnn4vXXqQ"]BRZ Testing at Motorsport Ranch - YouTube[/ame]

Here's the lateral Gs over each fast lap. You can see the Hoosiers are developing a little more grip in the corners, but not a ton.



When you add GPS speed, there's a little more speed being carried through the corners. Hard to get a perfect comparison, though, as you can see there was a little bit of traffic.



Sorry we don't have any better graphs, but there really wasn't that much to show. The Hoosiers handled exactly like the RE71Rs, which was great. We're anticipating a much longer "fast" life, though, the RE71s were good for a handful of sessions before they noticeably dropped off.

Jake

[Jonsey]

Car looks very stable and is getting quick!


Not sure if it is the lack of aero on your car now, but my lowest speed is about 5mph higher through Ricochet and 2-3mph on Big Bend on the 255 NT-01s. There may be some additional time to pick up still.

[GSpeed]

Originally Posted by Jonsey

Car looks very stable and is getting quick!


Not sure if it is the lack of aero on your car now, but my lowest speed is about 5mph higher through Ricochet and 2-3mph on Big Bend on the 255 NT-01s. There may be some additional time to pick up still.

I think you're right some of it may be aero, and I think some of it may be driver style (Ricochet, for one). The driver has spent the past few months driving an 800hp, high downforce Viper and the two cars need to be driven a little differently.

With more seat time, I'm sure times will continue to drop. The owner is pretty set on building this car for SCCA Super Touring (STU) so we'll be adding some tame, off-the-shelf aero since the rules are much more restrictive than NASA Super Touring.

Jake

[GSpeed]

After a VERY long wait, we finally got around to installing the AP brake kit!





Now THAT looks like a proper racecar setup. We're running Ferodo DS11s in the front, and the same PFC 13s in the rear.

[Pat]

Very nice! Why the endurance kit over the sprint? Do you plan on racing enduros with the car? Extra headroom?

[GSpeed]

Originally Posted by Pat

Very nice! Why the endurance kit over the sprint? Do you plan on racing enduros with the car? Extra headroom?

I can't find the numbers now, but I was happier with the brake bias numbers I was seeing with the Endurance kit when paired with slicks with a higher coefficient of friction. We also want the brake duct capabilities we'll get with the endurance kit since the car will be racing competitively with a supercharger.