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browny

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Posts posted by browny

    Curious about a R32 Gtst

    in Forced Induction Performance

    Posted

    This is the fastest R32 gtst that I could see the the SAU timeslip database, and this only just cracks a 12:

    http://www.skylinesaustralia.com/forums/me...ails&userid=462

    And here it is for sale:

    http://www.skylinesaustralia.com/forums/sh...ead.php?t=68602

    IMO if you want to run that time and you want a reliable driver, then this is the sort of thing i'd be looking for. You could spend a lot more than the $20k that Roy is asking getting to this point.

    EDIT: And Roy beat me to it :thumbsup:

    Question regarding lag.

    in Forced Induction Performance

    Posted

    Gts_evilution

    Refer to the two comments in the page posted up by Links. Anti lag is very hot and very violent = short life span.

    A quick rise of the turbocharger's temperature (which jumps from ~800°C to the 1100°C+ region) whenever the system is activated

    A huge stress on the exhaust manifold and pipes (mounted on a street car a bang-bang system would destroy the exhaust system within 50-100 km)

    The turbo produces significant boost even at engine idle speeds

    The explosions which occur in the exhaust tubes generate important flames which can, sometimes,  be seen at the end of the exhaust tube

    Reduced engine brake

    Rb25 crank into rb20

    in Forced Induction Performance

    Posted

    RB20 strokers can be built using RB25 or RB26 crank and rods. Final displacement depends largely on what size pistons you use.

    The Tomeii kit uses RB26 crank and rods, and the pistons are designed to suit. If you used the RB25 crank and rods with the Tomeii pistons you will find they sit lower in the bore.

    IMO its a relatively involved exercise that will involve rebuilding most of the engine (certainly all of the bottom end). It's not a simple bolt in bolt out proposition.

    Question regarding lag.

    in Forced Induction Performance

    Posted

    It is a perfectly feasible concept to have the turbo spooled up by an electric motor. The actual logistics of doing it make it a little more difficult.

    A turbo might use 5-10kW of power. A 5-10kW motor is reasonably large so there are packaging issues for one. The main problem however is providing power to the thing, and the problem with this is the amps required because we are only working at 12V.

    For 10kW, you would need around 830A @ 12V. So you are talking big cabling and either a huge alternator or some form of stored energy (ie a battery). Also a 12V 10kW motor needs to have really large conductors inside because of the high currents involved, meaning it's big and heavy.

    WRT the comments that they would take more power than they make, I don't think this is neccesarily true, as long as you could design a nice efficient system (I'd think ~5% loss in the motor would be achievable and you might also lose another 5-10% in the rest of the electrical system). So it might use 1-2kW more than what a conventional turbo would, which is more than made up for by the extra power that you get from FI.

    I don't know anything about what Nissan are planning on doing, however my comments above are based on full load, constant operation. Once you start to get into short term transient stuff, like what i'm imagining their system does, then you can start scaling the size of everything down.

    Airflow meter in 'cooler piping

    in Forced Induction Performance

    Posted

    I can't really see that it would make much difference either way. If everything is running fine as it is I don't see much (if any) return for the effort of moving it.

    Don't the VL's also have a more restrictive vane type AFM as opposed to the large hotwire unit on the Skylines?

    Packaging is another reason I've heard people give for doing this too.

    Power NOT a factor with young drivers

    in General Automotive Discussion

    Posted

    SuAvE-1

    Fair enough, although you seem to be more concerned with the way government works and the execution of the particular legislation rather than the actual concept behind it. Can I ask what is your opinion about the concept of regulating inexperienced drivers access to certain vehicles?

    Personally I think its a good concept, and with the correct implementation could actually benefit car enthusiasts and the general community. The problem with the current 'ban everything' slant on road policies is that it generally seems to be be pissing people off because people have an ethical objection to being told what they can and can't do.

    But, for example, what if this concept was approached in the following manner:

    * For the first year certain car types are restricted (suggest kW/kg + outright kW).

    * After this you can opt to do a driving course for say a nominal fee of $1,000-2,000, after which you can drive everything except for say the really high kW and kW/kg stuff.

    * When you are fully licensed you can drive anything, but those drivers who have done the course get an insurance break.

    So what this does is keeps the public/media happy by stopping really fresh drivers from using certain vehicles and it gives drivers a year to settle down on the roads (not very long in the overall scheme of things, so I don't really see it as impinging on anyones 'freedom'). After a year it then lets the driver make their own decision, ie do the course or don't drive the cars. The highish fee (which I don't see as an issue because the reality is that we aren't talking about cheap cars here) hopefully means that only people with a real interest are attracted to the course and therefore are able to drive performance cars, so hopefully the general dickheads are deterred. Fully licensed drivers also have the incentive to do the course because of the reduced premium.

    Now I can actually see this sort of thing being beneficial for car enthusiasts in general, because it allows enthusiasts to differentiate ourselves from the general driving population and to stand up and say that we are being responsible drivers. Also because the Govt is running the program, they will be looking to prove that their efforts are succeeding. So I would hope that overall it would appear that car enthusiasts were leading by example, as opposed to the present failing by example situation the media is promoting.

    Then if the Govt was really smart, they could start to roll this sort of program out to all new drivers, with hopefully the result being an all round improvement in driving standards, which should help everyone.

    Hosing Question???

    in Forced Induction Performance

    Posted

    any idea where i can get 16mm oil or fuel hose to replace it and the cost???

    If you find out a good cheap supply of suitable hose then let me know as well. 5/8"(~16mm) isn't a very common size, and its difficult to find a nice, oil resistant hose that is around the same dimensions as the Nissan hose. Industrial hoses tend to be a lot thicker and less flexible because they are designed for high pressures.

    You can get a hard clear 5/8" oil resistant hose with a loosely braided reinforcing from pretty much any hose place (its actually a food grade hose). I don't like it much tho, it's not very flexible and I don't like the look of it.

    Also available from hose places is a 5/8" high pressure hose, IMO not that desirable. Very inflexible and very thick wall which makes it a lot more bulky than the Nissan Stuff. Around $20/m.

    You can get heater hose in 5/8" easy enough, but its not oil/fuel resistant so it will break down over time. $4-5/m from pretty much any auto place.

    There is a Gates hose sold by Purple Pig for $20odd bucks a metre, but you have to buy a whole 7-8m roll.

    Otherwise Earls make non braided and braided 5/8" hose. $40odd/m for the non braided, more for braided.

    I eventually gave up and used heater hose just to get me running. I'll either use braided or the Gates stuff when it comes to tidying it all up tho.

    Power NOT a factor with young drivers

    in General Automotive Discussion

    Posted

    Hang on, I don't completely understand what your argument is?

    I'm not sure where you derive this question from, but it seems to be the government/media who claim that driving skills ARE age related as the vast majority of new licenses are issued to young drivers.

    You start off by saying that it is the government who claims driving skills are age related.

    I'm sure many would agree that you become a better driver with age and experience, but it is not fair to limit the choices (and effectivly, freedom) of a young person who is of 'legal age'. This is especially true when claims that having a high powered car are the main cause of accidents.

    Now you say that you agree that driving skills comes with age, but it's unfair that they can restrict certain types of cars, because you don't like the justification behind it.

    However, to have a power restriction, effectively limiting the cars we can choose to own, drive and have as a part of our lives is unfair to the other 'adults' of this society.

    Lets get his straight right. It's not like they are restricting one our basic rights to free speech, food and shelter. It just means you can't own a god damn luxury/sports car for the first few years of driving.

    If we were to get our P's at 17 and get our full license at 18, and this restriction was in place, I wouldn't have a problem.

    So overall I read that you agree with the concept, just not the execution?

    engineering certificate of exhaust

    in New South Wales

    Posted

    I'd be asking how some of the guys who get defected for noise get them cleared?? It might be cheaper to just take the defect then get it cleared.

    An engineers cert will give you a bit more piece of mind for the future and should lessen your chances of being pinged again tho.

    engineering certificate of exhaust

    in New South Wales

    Posted

    Theres a list of signatories here:

    http://www.rta.nsw.gov.au/registration/dow...s/vsi/vsi15.pdf

    I would still question whether a signatory will really be that interested, and is really needed. I'd think that are only going to visually check whether you have a cat and then do a noise test. Seems like an expensive way to go about some simple tasks.

    Unless the officer has given you a formal (ie written) instruction to do something, i'd be tempted not to bother doing anything. Maybe find somewhere that will do the noise test for free or a small charge just for peace of mind.

    engineering certificate of exhaust

    in New South Wales

    Posted

    Are you sure that you need to?

    To what extent can I modify my vehicle?

    Engine modification

    1. Original engine modified

    Modifications to the original engine are permitted provided the following conditions are met:

    • normal engine reconditioning within manufacturer’s limits is permitted;

    • modifications must not affect compliance with any emission or noise related ADRs;

    • all emission control equipment must be retained and functional;

    • If the modifications result in a substantial increase in power, then the adequacy of other components to

    carry the increased power (brake performance, vehicle controllability, suspension systems, etc) as well as

    the vehicle’s continued compliance with the applicable ADRs must be addressed.

    Power NOT a factor with young drivers

    in General Automotive Discussion

    Posted

    I feel that if they want to try and get rid of the stupid drivers then they need to be resitricting the raods to people who earn the privilage.

    I'm not so sure that restricting peoples access to licenses is really the way to go, this is not all that different to what the Govt is doing with these rules, and look at the reaction it is causing.

    I'm not going to profess to know what the solution is, because I simply don't know enough to make that call, but the elements that I would like to see emphasised are training and education (primarily risk avoidance rather than the 'everyone should do a skid pan day' approach) and more "safe to fail" methods of road design.

    What I think isn't fair is to make it really difficult to get a license, unless some sort of viable alternative is provided to those who either won't make the grade or can't afford the training/testing. Many Australians rely on having relatively cheap and easy access to a motor vehicle and most of our transport infrastructure has been developed with this in mind. You won't convince me that the current Public Transport system will be able to effectively pick up the slack if all of a sudden we have a whole lot of people who can't get licenses.

    Power NOT a factor with young drivers

    in General Automotive Discussion

    Posted

    If you commit a crimial offence and you are 18 years old, you are looked at just as badly as someone who is older. You are considered to be just as responsible, therefore, if the law acconts us this much responsibility, why believe we are not responsible enough to drive any vehicle we desire?

    So are you saying that driving skills are only age related?

    It comes down to the driver: if they are going to be stupid in a high performance vehicle, they are going to be stupid in a s***box.

    I'm not convinced about this one. You CAN be stupid in any car, correct. Whether there is the same temptation to be stupid in something underpowered and boring I am not sure. But yes, it all comes down to the driver.

    Woops accidentally hit the post button.

    I'm not entriely clear what the objective or motivation for this law comes from, i believe it is to contribute to the overall effort of reducing death on our roads.

    Response to a media beat up.

    Cops above the law?

    in General Automotive Discussion

    Posted

    I'm not saying that it wasn't reasonable for the truck driver to ask for proof that the supposed Officer (who now turns out to be undercover?) was actually a member of the Police force. IMO this is a perfectly reasonable thing to ask, especially if you are carrying some sort of sensitive freight.

    What I am saying is that (based on your story) I think his response of using physical violence to control the situation was inappropriate. Ok, i'm a realist and I can live with the fact that some people will act like this because they don't know any other way.

    If someone refused to show a Police Officer their license and gave them some lip, would you consider it appropriate for the Officer to beat the living shite out of them?

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