Rolls

I know its an old thread but if anyone is reading Id highly suggest a resonator. A single muffer and cat will always sound awful on an NA car, a good muffler with a good quality resonator will really bring out the awesome note with out the horrible raspy/cackly noise.

Theres someone doing a vh45de+tt setup on R31club at the moment as well in a GTSX coupe. Should be very nice, keep us updated.

Are you pushing it when it happens? Possibly the clutch slipping. Good way to test it is in top gear at around 60 rev it up and dump it, if it shudders around and really doesnt like it then you are probably fine, if it keeps revving and slipping then its on the way out.

Just means the sensor where the cat is is very very hot. Usually happens after you give the car a good caining in the hills, at least I know mine did.

Depending on the specs of the turbo its hard to say. With stock engine management you arent going to be able to get the most out of it. Depends on the condition of the motor and how you drive it. Also its pressure.

but does it chirp 2nd? haha, thats pretty impressive reading.

lol?

How much stronger would something like that be?

Its still running rich though, having a cat will just lessen the black soot that comes out and make it less obvious.

Get it tuned by someone who knows wolfs pretty well, ring around and see. You dont want someone whos tuned maybe 3 cars before and knows how to use it but not do a proper working tune.

I can see the reasoning for doing this, but essentially it isnt a true power reading though.

It's posts like these that degrade the quality of threads and make people start fighting over nothing. Seriously someone close this thread already.

Pretty sure stock computers run much richer then that. So as has already been said something fuel related is on the way out or your computer has somehow had a remap/different tune. The power figure it self doesnt really mean that much, there are always so many variables. I think its only useful for before-after comparisons and tuning. The way I see it, if it feels fast its fast, not if its got a big spanking number on the dyno sheet.

This thread is hilarious. I love it when people state things they read on here as facts and pretend they know what they are talking about. Forums are even worse then the interent, theres so much more misinformation. Who cares what your R33 gets on your dyno stock? Its there purely as an aid for tuning, or maybe to compare before and after mods on the same day. The figure is pretty meaningless even if it is accurate due to the whole power curve and delivery determening the speed of the car. Someone should lock this, its not really helping anyone.

That ausrotary thread and the one earlier from here are good discussions to read. No one has really prove either way it will or wont damage your turbo, so its really up to you to make your own decision on what you think. Personally I dont think you are likely to see any damage as alot of cars back in the 80s were fitted stock without bovs (R31s/DR30s etc and the VL turbos) and managed to see 80kms before they were required to service their turbos. The maintanance intervals are now more like 120kms but whether this is from the fitting of a recirc bov or just because they are manafactured better you dont know. Why the fluttering happens? because when you dont have a bov or it is so tight it doesnt open properly the compressed air has to go somewhere as the butterfly is closed. Now normally it'd go out of the bov but instead it moves backwards back through the compressor wheel getting chopped up as it slides past the blades (still spinning) then back out your pod filter. If you have a big intercooler it will bounce around and amplify the sound even more. All this talk about wastegates is complete non sense and has nothing to do with it. If you can be bothere searching theres about 10 other threads about this that explain it fairly similarly

After telling people for 2 years that waste gate flutter is some bs term some hektik in his vl calias turbs made up you get kind of sick of hearing it

Did you even read the thread? its not the f**king wastegate opening and closing, everyone doesnt have their own theory, people just spout bullshit over and over again. It is clear what is happening and why it happens and its been said several times in this thread. Man im sick of people. edit: http://ausrotary.dntinternet.com/forums/vi...bov&start=0 read this thread, namely the posts by riceracing, he knows his stuff, I think he is on these forums as well. Theres more information regarding flutter there then anywhere.

He doesnt see boost till 5200rpm with his current setup, I think 4k would be a great improvement.

They arent as bad as you would think, the old 5 litres and stuff are pretty terrible but the newer 5.7 LS1s with an exhaust and LS1 edit are seeing 13l/100km with 220-240rwkws and weight 1700 odd kg

you tell me? I didnt understand what you were saying, I figured the air just came back out the inlet getting chopped up by the turbine as it wouldnt be spinning with it causes a pulse of air which sounds like the flutter you hear.

The bigger the displacement the more exhaust gas you will have at x revs, hence it will spool the exhaust wheel up faster creating boost faster. But also the bigger the motor the more of a restriction the rear exhaust wheel will create so you need to adjust this to suit.

So what your saying is the compressor/shaft has slack in it causing it to move backwards and forwards? surely itd break pretty quickly if that was the case? do you have anything to back that up?

Im not quite sure how yours works but I think you would want to loosen it, dont loosen it so much that it leaks at idle though, ultimately youd want a really small amount of flutter at very low boost 3psi etc. That way you can be certain its not leaking vacuum at idle. Just play with it until it sounds right, its not going to do any damage either way, worst case itll pop and wont idle properly because its too loose and leaking.

LOL Guys do you just make up shit for fun, the compressor spinning backwards? c'mon if you dont know anything about it dont say anything, all it does is propogate misinformation. The air will just escape between the blades slowling minimally, thats why it makes the chopping flutter sound, if it stopped the compressor completely or pushed it backwards or whatever it would sound just like a bov cause the air wouldnt be getting chopped up. The flutter does sound fully sick though, my stock redtop rb20det R31 fluttered like crazy, they came out stock with no bov.

Sorry but thats complete bollucks. What has happened is the bov is too tight/not big enough and its not opening or only partially opening letting only some of the built up pressure out. The rest of it goes back through the compressor and gets chopped up making that flutter noise. Now that you can installed a big front mount the noise is amplified so you can hear it much easier. The noise is coming out of your pod filter not the bov. If you were to run absolutely no bov at all this is what you would hear. Try loosening the bov off a bit or you can or get a bigger one. Theres some good discussion in here about running no bov to get the sound always. http://www.skylinesaustralia.com/forums/in...&hl=flutter