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SCCA Street Modified RX-8

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SCCA Street Modified RX-8

Old 12-10-2018, 09:28 PM
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Haven't felt like posting anything in a while. But I wrapped up the fuel system, so figured I'd put up some pictures.

Flow-through fuel rail with 6AN fittings on each end.



Feed line is 6AN through a 10 micron filter mounted in the trans tunnel, and 6AN all the way back to the pump.





Simple plug to defeat the pressure relief valve in the S2 pump assembly.



Bulkhead fitting with a 3/8 barb inside the pump assembly and 6AN on the outlet. The barb connects right to the barb fitting on the pressure side of the pump. The stock siphon mechanism is preserved.


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Old 01-02-2019, 09:35 AM
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I made some progress over the holidays. Because I can't seem to be bothered to take pictures of incremental progress, some of this isn't really well documented.

Engine is back in for the (hopefully) last time before I turn the key for the first time. I made a battery mount, finished all the battery wiring, and powered up the car. Everything works, the fuel pump primes and builds pressure, no leaks that I can see or smell. I finished up the oil plumbing, though I may shorten one hose. Sensors are in place for fuel pressure, oil pressure and oil temp to connect to the (eventual) aftermarket EFI. The DBW throttle even works without the engine running, which may be of use if I go with a Megasquirt ... could use the stock ECU to do the throttle and the Megasquirt for everything else. Not sure.

Mostly I spent a bunch of time cutting and fitting intercooler pipes until I was happy. I wanted to minimize the number of silicone couplers in the intake tract so I had a buddy TIG weld it all together for me.



The piping is a lot easier to manage without all the couplers everywhere.





I got the clutch fitted, reinstalled the transmission and finally got to install the driveshaft that arrived months ago. Everything fit together as expected. I bled the clutch and tested its travel... it seems to fully release but it's definitely close to the floor. I may need to modify the factory clutch pedal, or at least just adjust the plunger to get a little more release, but I won't know until I can start it and test the driveline with the engine running. It's already been reinforced as I guess it's pretty common for them to break.



I didn't like the way the Fab9 kit had the oil drain at the block set up. They call for you to drill and tap the block in an area between two internal strengthening ribs. The problem with this is the block casting is angled there, so it's very hard to thread in the (3/8 NPT) fitting they want you to use. And the hose to the turbo is so short it's a pain to install. And everyone seems to have issues with it leaking. I saw this stripping out pretty quickly, so I turned an AN fitting to TIG weld into the block, now installing and removing the turbo oil drain is easy.





Not much to do before I can turn the key. I managed to booger up the one O-ring I had for the (Ranger) dipstick tube at the (custom) oil pan, and nothing I have in my stock will work. I need to make a plug for the stock dipstick tube (in the valve cover) since I'm not using that with this pan. I need to figure out the hot side radiator hose connection, now that the intercooler piping is done I can work that out, plus one more hose for the overflow and another one for the heater core return. Oh, and there's no exhaust, just a dump pipe off of the turbo. So, that's gonna be loud.
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Old 01-10-2019, 07:49 PM
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Hey John, looking really good. On our XP RX-7, we just added a 17" two stage Burns Muffler and dumped it under the car straight down and have almost no problems with sound.

Is that the tranny you bought from us at Nats?

Mark

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Old 01-11-2019, 08:18 AM
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Originally Posted by Hi Flying 8 View Post
Hey John, looking really good. On our XP RX-7, we just added a 17' two stage Burns Muffler and dumped it under the car straight down and have almost no problems with sound.

Is that the tranny you bought from us at Nats?

Mark
Mark,

It most certainly is! Thanks again.

Your XP car has an REW, right? With the four cylinder I'm hoping it will be a little easier to manage sound and EGTs, so I bought a 3" in/out, 6.25" diameter round Borla that is about 17" long and I'm hoping it will be enough. I only have everything tacked into place right now but the muffler lives right next to the gearbox and dumps under the tailshaft area.
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Old 01-11-2019, 08:32 AM
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Not much interest in this thread here, but here's a small update. I have a bunch of small stuff now that needs to get wrapped up. And a couple big things - engine management (I'm thinking Haltech at this point), tuning and aero. And the inevitable long arduous debugging period that will probably consume me for the rest of the year. But it's complete enough that I put it on the scales to see where things stand.

2526lbs is not bad and 25lbs lighter than I had projected when I started this whole mess. Interior is complete less the driver's seat, which is 8lbs (Sparco QRT-R). There's no muffler or piping other than the downpipe off of the turbo, but if the exhaust is more than 10lbs I'm doing something very wrong. It's probably two gallons down on fuel from where I'd normally run it, so 12lbs.

I'm estimating now that I'll probably need 20lbs of ballast, which is not a bad thing. It's annoyingly front-heavy, but that was expected as a lot of the weight came off the rear (diff, power plant frame, exhaust, trunk junk, rear seats) and the middle (gearbox, PPF) and the front weight that was added (intercooler) is way out in the nose. Crossweights are obviously way off, it's sitting on wood blocks for springs and the right rear tire is flat. At some point I'd like to convert to the smaller NC brakes and put together a setup with lighter calipers and rotors but it's not in the cards for this year. Engine management and aero are going to eat up the last of the budget for this year.

Just waiting on my factory computer to get back from having the immobilizer removed and I can fire it up... or try at least.





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Old 01-11-2019, 12:47 PM
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Yea we're REW. The build is looking really solid and I'm really interested in seeing it-probably in Lincoln.

Hey, I haven't seen your brother for a while. Did he move out of Co.?
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Old 01-11-2019, 06:17 PM
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Originally Posted by Hi Flying 8 View Post
Yea we're REW. The build is looking really solid and I'm really interested in seeing it-probably in Lincoln.

Hey, I haven't seen your brother for a while. Did he move out of Co.?
Nope he's still in the Springs... he just sold the Elise a couple years ago because he wasn't autocrossing anymore and is looking to retire soon. He spends most of his free time playing hockey and traveling. He's doing well.
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