The Dan

Sean - EFI Performance 3801 8075 He's away until Monday though

It's simple....and has been answered many times before....a two piece shaft is stronger, less likely to buckle or bend in the centre due to it reaching critical speeds. A one piece tail shaft of 50inches made from a tubular 3 inch x 3mm wall steel will go critical at approx 6500rpm or so. They can last a while without bending and the strong ones last the longest but the higher speed it rotates, the more chance it will have of buckling. Two piece tail shafts have a bearing in the centre which means each part of the shaft can see well over 15,000rpm before bending. I've binned more one piece tail shafts than I even care to remember. Unless they are made from aircraft alloy, are very thick or are made from carbon, they are rubbish.....I don't care how big the unis are

That torana has a standard engine

1. VR Commodore Ute - 1JZ (fastest and quickest 1JZ in Australia - currently doing 9.1 @ 153) Owners name is Derek 2. LJ Torana - 1JZ (quickest/fastest manual 1JZ in Australia - 10.3 was his time with the manual I believe but he put an auto in and now does 9.6 @ *edit* was 147mph) Owners name is Danny Photos of the commodore are on my Facebook but the Torana is on Youtube on EFI's page http://www.facebook....14465228?ref=hl

50c says you only make 200-220. Either that or the magic mushrooms you are eating have affected your perception of acceleration

Wow, 246kw on only 10psi. That seems normal for a T04Z

The 1JZ engines we have here run 60 psi boost and 150-200 shot of gas and don't have problems with the custom plenums that are on them. At the end of the day it all comes down to whether the person making the thing knows what they are doing. Any wanker can weld a box up and call it a plenum. Making it work and making it quality are two totally different ball games

Throttle bodies are overrated. I've seen CA's make over 450hp on the standard item. I'm pretty sure its about 48mm

Going with a an aftermarket plenum will only ever give gains in top end power. As long as it's made correctly

I could have it diagnosed in one hour but it would cost you more than $50. If you are at wits end, take it somewhere that can diagnose it for you

I'm referring to the 5puk button variety btw. The organic we don't really push past 300rwkw

It's possible that slight arse covering is being done there. Maybe they don't want to say they can do something and then have one guy prove them wrong.400wkw is getting close to where we've tested them up to so I'm guessing that would be why they would say that

I don't know why they would. Our NPC single plate 10" clutches are both holding 400-450rwkw happily for over a year now. Drag events, circuit racing. No problems. We rate them up to 600whp before we suggest a twin plate is necessary

I have a new speedo cable I bought for someone here but they didn't take it, if you want it. $110

If the head is not badly damaged from overheating, expect $1500-$2000 to do the job properly. Cost break down would be: $400-$500 VRS set $1000 labour (10 hours) Thermostat, oil, coolant etc $100-$200 Crack test, vac test and deck head etc $120-$200

What I am talking about is the spiral separation of the gears trying to twist off each other. I am fairly sure that is what you are referring to as axial thrust (I don't know the technical term) but it definitely causes problems due to that thrust. You are correct though, pressure angle is usually about that amount. The helical gear itself is stronger but due to the thrust loads you have mentioned, these boxes suffer as a result. That's why straight cut gears are generally referred to as 'stronger'. The reason a helical gear is stronger compared to an equivalent spur gear is because of the surface area of engagement (yes I know you know this - others may not). There is a certain amount of vibration in spur gears when used in higher RPM situations. That gear pictured....what rpm would it be spinning at? At the end of the day it all comes down to the material used. A nissan helical gear is never going to be as strong as a billet or forged helical or spur gear in the same application so a lot of people get confused when 'helical is stronger than spur gear' is mentioned

Unless you plan on taking your engine out and the sump off, you'll have to settle for the factory oil pump.. Replace the water pump with a standard one. N1 will possibly cause cooling system problems due to the climate

If fuel is getting past the regulator then you have enough fuel to start the engine. Don't worry about a pressure gauge for now. Do as suggested above and listen for the sound of the injectors while rotating the CAS with the ignition on. They will be fairly noticeable. If they don't pulse, get an LED test light or a noid light and test for injector pulse. If you have injector pulse, turn the ignition on, get a screw driver and LIGHTLY tap each injector while a mate rotates the CAS. If any of them start ticking after that, take them all out and get them cleaned and flowed

Screamer length can be long Gate entry pipe is better short

We just see a lot of problems with them around 20psi/400-420whp

Yes. If you make the gas easier to get out through the turbine, it will continue to do so

It's a conspiracy. I will start importing second hand skyline gearboxes. All you guys just keep running them. They are stronger I tell you. I'm going to be rich!

Yes, the reason big gearing is helical is because it's big. You create enough of a harmonic on a straight cut gear that's THAT large it would shake the machinery to pieces. Just because large machinery uses helical gears, doesn't make them stronger. The gear on gear strength may be stronger (if you say so) but the GEARBOX as a whole is weaker because the two gears are always trying to seperate each other. Seperate them enough and they tear themselves apart.

Yep, that's right on the money. 0.040" is an acceptable level for safety from coil bind so you will be sweet. The GTR spring should have a heavier coil, hence the higher coil bind height. Should be a very moderate upgrade. We bin GTR springs all the time so I'm not sure how far they will actually get you

Yeah the airforce have it for sure. I didn't know they built group A cars though. My bad