Edge

Yokohama A500's are just as quiet without the extra silicone for wet performance. Just not sure if they come in your size. Also you might want to compare whether the ones you have have silicone at the moment. I rechecked this - the A500's are actually quieter than the V550's

You need Yokohama decibel V550's Silent tyre !!! + extra Performance silicone grip. It is absolutely worth the extra dollars. They even wheel spin at a quiet note.

I've run into a few problems. Took my car in to get the sway bar plates and link on. When they jacked it up they said it wouldn't damage the sil to put the supports there - it did ! Now I have to take it in for repair and paint on Monday In the future I'm going to have to get tough and tell them to let me position the 4 point jack personally. unfortunately got given the wrong sway bar link to go with the mounting plate Looks like I have to wait til 2nd Jan to get replacement. This time i'm going to buy both the right and left as spares and get them welded with two strips of reinforcent longitudinally so they don't snap every 6 months. I seem to remember seeing something about a track day on 7th Jan?

lol, are those spinners on the outside?

I rang them a few days ago and it was still on. I just noticed my right side front sway bar bracket has snapped! not sure if I can get a replacement - I'll try to visit Justjap and get a replacement tomorrow morning. Rang them, got the cleaner there who said they havn't closed for Christmas yet Do you think the rain in the morning will make it so there is more track time to the people who turn up on tomorrow on Saturday? Since I'll probably be fixing the link on my car in the morning this might work out well.

should I fit my set of 4 slotted brake discs before or after track day? Does it really make a difference?

We got helmets today also the CAMS approved fire extinguisher was $32.99 at Repco Are black leather shoes suitable, or do the shoes have to be covering over the ankle?

Just get a street legal race going. We need this street class for all those who dream of modding our street car up to race on the track while still keeping it legally registered on the street.

Whats my sau member number Duncan? I am going to be buying a helmet too. Hey Albert when are you going to buy your helmet. I'll come with you perhaps they'll give us a better price if we buy 2 at once? sending you pm

Where do I get the triangles for the battery location from? Just rang Oran Paark, it is still on this Saturday. Opens 7:30am start 9:30am close 4:30 close 5:30 I think. Does anyone know where to meet up once we get there?

This for the R33? pm me please pablo101

no don't invest in the cia rape of rights to privacy

I am going!

send me a pm of the tuner please.

Take the whole SAU club for overnight stay during consecutive Sat and Sun track sprint days. $3000 toward rooms in a conference centre - not sure think its about approx $230 (at Bowral for example) for a night per suite including a 10mx4m lounge room and 7x4m bedroom and 3x4 spa bathroom. The centre comes with swimming pool and gymnasium and gardens and plenty of free parking! And do it again every 6 months or so to spend the rest. Would it be better cruising to and from the race track or picking somewhere close to a race track?

Thanks, does the metal bracket need to be properly fixed with screws into the metal body or is it ok onto the plastic of the car?

I just checked, sorry i don't have that.

ok I want to come to this, is there anywhere I can go in Sydney or will there be someone there on the day for me to join the club and apply for a temporary licence so I can get on the track? also what are the car equipment requirements such as helmet, fire extinguisher...etc. Where do I buy a helmet and what kind of helmet qualifies?

Are you talking about the bit with the numbers on it 123D ?

discopotato03 Are you refering to single compression or a turbine wheel when you speak of a single twin scroll system? Or a single turbo that has two wheels with seperate exhaust inputs for each wheel? So to try to answer silverbulletr33's question, The bigger turbo would be kinder as the exhaust side flows better and requires less (turbo) rpm: This results in as discopotato3 described above, the lower likelihood of exhaust gas backflow into the cylinders raising air temp under compression which can lead to detonation.

I'm looking for clarifaction on this too My guess would be that the higher pressure on the intake manifold generated to produce the required volume of air with a smaller turbo may cause detonation. If variable cams can be adjusted to lower compression ratio it should aleviate the problem mostly shouldn't it? My limited understanding of cams is that cams control valve lift duration and distance and thus probably also control compression ratio through the 2:1 directly proportionate effect on piston duration? At least it makes sense that the compression can be lowered through allowing valves to let some air escape at the beginning of the compression stroke to compensate for the higher pressure and temperature. With the same power output being in the operating range of each turbo: It is probably equally efficient regardless of bigger or smaller turbo and the only real difference is the speed of initial low rpm spin up on one hand; and the potential for increasing power output on the other.

I missed the previous two posts before mine. Wow great description of the virtues of twin turbo. I'll read the posts I missed in more detail now.

yep dicopotato03 - I was talking about the compressor wheel outer edges going supersonic or what ever you want to call it. Are you trying to say it is caused by physical vibration or something - what do you mean by mechanical speed limit? As far as I know it can spin even faster such as mach 2 for example! Bigger compressor wheel outer edge can go supersonic faster. Then cavitation (air compression from air being thrown to the outside) effect is lost and you get back flow of the pressurised air through the compressor blades which is obviously really bad. Choice depends on balance of speed and wheel sizes for the amount of air required by the engine, and on whether the engine supplies enough exhaust volume at low rpm to spin a larger turbo's turbine. Variable cam shaft in the 2.5L helps to give this. Some turbo's attempt to prevent compressor surge through the blades by enabling backflow surge to go around the outside of the compression wheel instead of through it. I would think you would have more loss from a small turbo going supersonic as you attempt to acheive higher power than it is designed for. As for whether compression in the cylinders is increased due to higher manifold psi now that sounds like it could be the case and is a good question, hope someone can help with an answer. It would also make sense for more heat to be generated with higher psi. However in general a small turbo should spin up producing boost earlier due to smaller exhaust turbine housing taking same initial air volume = more speed and less pressure due to flow dynamics of circular air flow in a smaller housing. The idea that a smaller turbo is better thus has its appeal.

interesting - but couldn't the turbo still output 14 psi while the wastegate is actuating at 20 psi? is selcting a spring guess work? I suppose if the spring on wastegate is directly connected to the turbo you could get a flow bench test.

After reading my own reply, I realise that I don't really understand cams. I want to know if the compression ratio is lowered through raising cams. Also if so does this mean more or less exhaust output at lower rpm?