ScatterBrain

Basically for better efficiency. Yeah sure a gtx3582 can make 630hp @ 22psi but not as safely as the sx369. If you glace at the post above you'll see the AFR is around 11.6, If I was the lean it out to around the 12.4 which is about the average for a lot of tunes, it would make a reasonable bit more power. But as my car is setup for circuit racing and I have longevity in mind, I have opted to keep everything on the safe side, Timing included. On top of that not having a water cooled core means less heat it to the cooling system.

The rear housing is a modified .82 internally gated efr9180 housing, with the 80mm turbine wheel it flows just a bit more then the stock 1.06. By my calculations the choke threshold would be around 700 to 720 rwhp. Boost curve for second last dyno pull, Gtx3582r (Green) vs s369 (Red)

my old gtx3582 for reference.

Finally finished the last of the oil cooler ducting, Hopefully no more overheating on the race track.

Yeah I saw the release photos from Sema, although I'm not sure if they even have a release date for them yet. But of the two, the 91x81 would be my pick.

Granted the EFR has a ball bearing core, but the compressor efficiency drops off too soon. Attached are the compressor charts of both turbos with a plot for approximately 700 crank hp at 23psi. Plot point 1 = 2000rpm, 2 = 3000rpm, 3 = 4000rpm, 4 = 5000rpm, 5 = 6000rpm 6 = 6500rpm.

I would recommend the Borg Warner S369sx-E over the efr 9180, Its better suited to our engine requirements. Also can be low mounted on standard Fg manifold.

Heat is always the killer, Did you happen to log you peak temps? Have you revised your cooling or are you hoping for cooler weather?

He crashed on the exit of the Eastern loop and I was about 2 meters behind him when it happened.

Well just wrapped up the last track day for me this year, That brings this years total to 26 sprint meetings and thankfully no major failures or damage. But it's a shame that can't be said about the poor chap who wrote off his 180sx at Lakeside today.

Gave the rims a wash today ready for x-raying, Found another with hairline cracks in the back of 2 spokes. Also here a video of my fastest lap on broken rims. https://www.youtube.com/watch?v=0Pn_BYmEk0s&feature=youtu.be

Nothing out of the ordinary happen to the rim, never hit a curb or anything. I'm getting the other 3 x-rayed for cracks on Monday, Should be interesting to see the findings. I doubt it was downforce related, The splitter at best would generate about 80kg @ 200kph. The rear wing I think would around 200kg @ 200kph. I've been looking at new wheels and there are so any options, I sort of leaning towards some Enkei NT03+M or T6S. I would love a set Of Volk ZE40 but $800 a rim is a bit much.

They are Koya Drift Tek's so they should have been up to the task, I've sent an email off to koya just to get their opinion on the matter.

Today was the test for the new Aero mods at Lakeside raceway. The amount of traction was just phenomenal, I was just getting the feel for it when a slight vibration developed in the front. At first I didn't thing much of it, I felt like a bit of rubber stuck to the tyre so I gave the brakes a stab and the vibration went away. So 2 lap passed and then the vibration came back harsher, Stabbed the brakes again but it didn't fix it. This time however after each corner the vibration got worse, So I decided to pull into the pits and check it and I'm glad I did. I found the Left front rim with 2 broken spokes and the 3rd starting to crack on the backside. The upside is I set a new PB on a broken rim but the downside could have been very catastrophic. Spoke #1 Spoke #2 Spoke #3 Car: BF XR6t Circuit: Lakeside Time: 60.1588 sec Power: 404kw Suspension: Tein Tyres: Hankook Brakes: PBR-M Weight: 1890kg with driver

If you don't want to go full ducting you could try some air scoops. Here's what I made for mine.

Funny, I'm in the same boat. Been looking around for an upgrade too. Although I was tossing up between a Plazmaman 1800hp or Process West Stage 3. I think for circuit racing where you have high volumes of air passing through the cooler, It all comes down to the fin density. The high thermal storage of a bar and plate cooler would have no advantage over a tube and fin due to the lack of time required to dissipate the stored heat. Although I haven't found any useful information to support my theory.

Good day yesterday at QR, Shaved 1.3sec off my pb. Quite a few cars suffered heat related issues, 3 cars left of tow trucks with dead engines. New front springs worked a treat, Now I just need to raise the front roll center. Car: BF XR6t Circuit: Queensland Raceway (Clubman) Time: 61.1935 sec Power: 405kw Suspension: Tein Tyres: Hankook Z214 Brakes: PBR-M Weight: 1890kg with driver

At Lakeside yesterday no new Pb but still a good time. Also finaly managed to get the data logging to work. Peak g-force readings. Cornering: 1.38g Accelerating: 0.5g Braking: 0.67g Peak temps. Ambient 31°c Coolant 108°c Engine Oil 109°c Trans Oil 98°c Intake Air 56°c Top speed: 223 kph Peak Rpm: 6169 rpm Richest AFR: 11.344:1 Car: BF XR6t Circuit: Lakeside Time: 60.971 sec Power: 404kw Suspension: Tein Tyres: Hankook Brakes: PBR-M Weight: 1890kg with driver

There were 3 main photographers there, One from the BMW club, 4020 Media and LC Photography. None of which have uploaded any photo's of the BMW crash, Although I haven't asked if they actually have any.

He spun it 180°, hit the grass sideways and rolled it down an embankment. Drivers was fine, just a bit of whiplash.

Busy day at Lakeside today, General practice had 70+ and Sprints had 52 cars. Every one had a good day besides the own of a 2012 v10 M5 BMW that totaled his car on the first run. Didn't quite make it into the sub 60's but shaved a little more off, Also managed to run out of fuel again. Car: BF XR6t Circuit: Lakeside Time: 60.649 sec Power: 404kw Suspension: Tein Tyres: Hankook Brakes: PBR-M Weight: 1890kg with driver

Do you have an engine oil temp gauge? You may find it pulling timing/add fuel because the oil temp's getting to high. Also what sort of fuel pump are you running?

The front splitter I made and the rear wing I bought off a company on ebay. The boot lid should just needs some extra support from underneath to spread the weight when it generates down force. The factory rubber stops would just compress too much otherwise. I think the wing cost around $600 and the splitter I made for about $100.

I hope to have them on the car in the next 2-3 weeks.

I only use it at Lakeside because all that Armco is just too close for my liking. With 400+kw and z214 the traction control still repeatedly comes on, I think It may be to do with then inside wheel lifting but I'm hoping some rear down force might fix it. Besides the blinking light you can tell when it's working, It's like going from 400kw to 300kw. It wouldn't be so bad if it didn't take so long to stop working after it's corrected the situation.