GTRgeoff

Yep, 2 clutch lines mate, thanks.

2 please Adam. Quick as you like

I intend to be there. Lakeside is the spiritual home of Qld racing and needs to be returned to us.

It should flow more through the 1.5 even though the 1.1s have a slightly larger cross sectional area, due to the surface roughness equations and the interaction of the sharp edge orifice/turbulent layer effect, but then there are journal clearances to consider. It's never exact. If the bottom end was on its way out then likely the head rattling was an indication of lack of flow. It is a closely balanced equation for the distribution of flow and so tolerances need to be carefully guaged and the correct bearings ordered. The one area though that can end up with too much flow is the head so we restrict flow with the smaller restrictor.

Pressure is a measure of restriction, not flow. It is a function of flow though. Maybe it was just a bit loose up top.... And SK does now his stuff

What's the black worth to you Anthony? And tell your brother not to worry. He'll win. Even on crutches he could beat an R32.......... lol

Caleb, I assume you haven't driven a GTR then. They are a particularly lazy engine and take a little while to make power when off boost. I guess the lower compression compared to a GTSt is the difference, as well as having to crank up 2 turbos that make more than the GTSt singles. A 30 will have more torque at the same CR and benefit from the modern head for flow and response. In my case I have 9:1 CR so it should be even more torquey. It made 160rwkw as an NA with the turbos hanging off it and as I noticed today putting new cam gears on, one tooth out advanced on the inlet so has been particularly sluggish. More to follow when I get it running again btw guys. As for a R34 GTt head, our mate Spoolup has one so look him up, plus source your cam gears/rods/CP pistons from him. Oh and Shane, while you look and remind me of Ash (la Nismioda) , we really really only need one of him.....

Be nice Noel you old fart. Maybe he can hook us up with some good stuff. Bundy Rum and Bundy Ginger Beer........ I like Bundaberg. Did horrible things in the Nurses rooms at the Base Hospital

Sorry Waz, confused ramblings. I was looking for a reason to justify us getting an XR8 sedan instead of an XR8 ute and a V35. My wife wants the CVT8 so that means it's a 4door but it will be nice to have a couple extra doors. Right now I have 5 cars and all are 2 door. I have it on good authority the CVT8 is the quickest in the stable as it stays on the boil. Nissan stated it was the first auto car that couldn't be outpaced 0-100 by a pro driver in the manual.

I've been looking at a 350GT-8 for the wife, and an XR8 ute for towing and work. I'm still yet to drive a 350 in any form but don't expect it to be a fast car, that is what the racecar and GTR are for but I've found myself thinking. The problem is the ute will only take 2 people and I won't have the other brand with a 4 door V8 ute, nor do I want a landbarge 4wd but I'd like to carry fishing/diving buddies when going out in the boat. I also want the full leather and comfort in the towmobile but about the only other option is an XR8 sedan. Of course with this we should then only need the XR8 and not a 350GT-8 but her royalness has put her foot down. I get the GTR and racecar and XR8, she wants the 350. Would anyone have a comparable experience in these machines to help me decide or make a suitable argument?

Al, I have one that was returned to me. It got bent in the inlet pipe and is crimped slightly but could be fixed at somewhere like HIS hose in Somerton. Yours for $50 delivered mate. Cheers

Not a fan because the N1 is a much more brittle material so doesn't have much residual toughness for things like bouncing off the limiter, but that does happen even if you don't want it to. Also there is no real justification for much higher oil pressure/flow. All it will do is deposit more oil in the head which you then have to get back to the sump for pickup. Oil system function and efficiency is not based upon the amount of flow or delivery pressure, but the maintenance of the thin film of oil between moving metal components. Oil pressure does not provide lubrication; oil presence and viscosity does it. Some systems use the natural viscosity to pull the oil through without a pump. It would be great to know that the flow is moving the oil through to prevent overheating and molecular breakdown, but pressure is always a measure of restriction when it comes down to the final analysis so a high flow pump giving greater pressure head is simply showing the restrictions present, and therefore the lack of ability of the high flow pump to really make any discernible impact.

Brett, it isn't the length of the drive in the pump, but the contact area. Smaller contact areas result in higher impulse loads and ultimately decreased pump life, especially if you hit the rev limiter too much. While you are at it make sure the pump is dismantled, guaged to ensure it is good and the the screws loctited in. $400 seems a bit much considering I paid 1400 for all my machining and balancing.

The RB25 pump is the same as an RB26 pump. Flows the same, holds the same FAST part number. The pump drive is a point of concern so get the collar fitted, as they all need them else they would not have standardised the drive width later. I have a number of nasty images of the short drive and what can happen to the pump, RB30 and later RB25/26 as well as those N1 pieces of junk. This is not the the thing to try save a few bucks on. There are diminishing returns in other areas but oil supply failure is catastrophic for the motor. Good luck with the build.

Then say nothing and appear wise grasshopper. Usually only the uneducated cast doubt on the science and engineering, but hey, both are still booming industries.

Shane!! Mike!! Play nice or you will be fed vegetarian snags at the BBQ!!!! Sorry guys I made an error. I was locked onto a solution for mass moment of inertia which is a solution in mm^4. Basic rotating inertia is a quadratic with a solution in mm^2 but regardless the difference in the above example is 400mm^2 and 900mm^2 or 2.25 times the rotating inertia. So even with double the exhaust gas a larger turbo by 10mm is still going to exhibit a measurable lag response. Add to that tolerances will have to be greater in a larger turbo to account for inertial growth and life cycle creep.

Inertia is a function of the radius to the 4th power, so a turbo with a radius of 20mm will have an inertial factor of 160000mm^4, while a turbo with a radius of 30mm will have a factor of 810000mm^4 or about 5.1 times as much resistance to acceleration. Now there will be some detailed integrations of the actual masses in the rotor construction and the material used but pound for pound a larger turbo is a diminishing return for response so you increase cubes to offset that. Sorry guys but the engineering wins. Twins for response. Singles for lag monster drag and dyno queens.

Aaron, try NPC in Archerfield. http://www.npcperformance.com.au/

Ouch....a ceramic???? I grabbed a NPC organic respecced Nismo clutch from Archerfield and it is rated to handle the 600hp I will be throwing at it..... and no Jim to chew my ear off

I can't see how that can improve the efficiency of the turbo. A statically cooler air charge due to the addition of water spray may increase volumetric loading but the argument will continue as to the quantity of non combustible water in the charge affecting the process. The fundamental theory when I was studying this was that the presence of water droplets acts as the detonation suppressant. Not the cooling effect increasing the net availability (entropy from memory) of air for combustion. It's just extreme phase diagram chemistry and probably beyond my brain after a bottle of red........... [hic]

I worked a lot on water injection during my uni studies with a couple of motors on the engine dyno. We found a certain particle size for detonation suppression was critical. Using the stream seems to develop it well but destroys turbos. Atomising pre turbo was not so great as the compression raises the temp and relative humidity is dramatically lowered so the particle is absorbed or the size diminished to a size smaller than the critical size for detonation suppression. the best location was post intercooler using a mechanical pump with a step control system to match water spray delivery to rpm on a lead system predicting rpm. Too hard, too complex and possibly illegal in most classes of racing I'd guess. If I had access to a Uni research budget and another research thesis to complete I'd have a million topics I'd love to do.

Yeah go R32 Mike so I can whale you in the 33...... ...honestly by the time you stiffen a tired old chassis like any 32.... ahh who cares Seriously now though, don't go pre turbo with the water. It will work over the compressor wheel and do nasties. Way back when they were just shooting a stream into the compressor which did a great job of atomising the water, which did a great job of chopping off the vanes........

Fear not. The racecar is a GTS25t, but just twin turbo with 3.0L bottom end and RB26 head. I need to get home by 5.30 for the Rugby but see you Saturday.

Aaron I have one sitting right here under the house in Ipswich. Just came out of the racecar. I assume you want the viscous LSD and not a proper mechanical. BTW looking forward to the next skidpan day with the racecar. Geoff 0408124767

Great to hear things are back on track mate. We just had our tenants in ACT do a runner to Victoria. Stopped paying the rent, wrecked one of the garage roller doors and the place needed the cleanup job as always. The only upside is we were locked into a rent amount $50pw under market so we have a group in that are paying what we wanted. There sometimes seems there is no upside to rental. Sometimes they will pay the rent, maybe even on time. Sometimes they won't trash the place completely but aside from the mortgage not being covered completely there are costs. So far the worst renters have been middle aged a*seholes with attitudes and more BS than anything else. They are on bad tenants registers and court action/warrants still outstanding. Way to burn bridges. Our best renters have been younger groups with females and the current ones are 19-24 (group of 4) and very keen so we'll give them a chance. All work so if one loses a job there is some capacity to cover the hole by the others. We had one couple wanted to pay the 420pw and the wifes job was just the rent. Just too fishy for us and we expected they would move in others not on the lease then try to screw us. What do I expect I suppose? Filthy rich landlords are surely just raking it in and deserve what we get, and a Labor govt will be the answer to the horrible life we have under Howard too if you believe the tree hugging carers and sharers out there. Not that it costs money to own a rental? Oh no, at least now I'm not in the hole an extra 200pm so essentially providing rental is charity with a potential pot of lukewarm beer at the end in an attempt to cover your own retirement without taking more from the "battlers" who would ask for help to clean up if they p*ssed their own bed. Maybe I should just sell them drugs instead of a roof over their heads. At least then it won't be all my fault as a filthy landlord.