Jump to content
SAU Community

Recommended Posts

Lol , harsh but understandable responses...i too preferred this sound but once I learnt about the physics of the whole thing , I decided my turbo was more important then a sound. Anyone reasonable will come to the same conclusion. The sound is from the fact that the bov is blocked off/not working correctly , leading to air rushing back towards the turbo when the throttle is closed shut. This hair is chopped up by the blades of the turbo leading to the psh psh psh. If you hear this sound it either means that your bov port is blocked or it isn't working correctly. The pressure on the blades usually doesn't do much but in a series 2 r33 the wheel is ceramic not steel and is more susceptible to being damaged. If you really want the sound , as stated above , all you have to do is block of the bov but this may (and is still highly debated) shorten the life of your turbo , especially if its ceramic wheeled.

I was under the impression that it's only the exhaust side that's ceramic on a R33 turbo?

yes this is correct however there have been many failures , thought to have been caused by a blocked bov on series 2 ceramic wheeled skylines as opposed to much less failures to on the s1's . Like I said its still a hotly debated topic as to whether it does any significant damage (you'l hear the vl guys talk bout their hectic flutter setup running strong for 3 years on the stock turbo)...but Id rather keep away from that , fit a pod and just be content with the "whoosh" sound.

Yeah trying not to start that debate.

But.

How does the air on the intake affect/effect the ceramic blades on the exhaust side?

The pressure on the blades usually doesn't do much but in a series 2 r33 the wheel is ceramic not steel and is more susceptible to being damaged.

Yeah trying not to start that debate.

But.

How does the air on the intake affect/effect the ceramic blades on the exhaust side?

it shouldnt...at all...as far as i understand..just pointing out that for some reason the ceramic wheeled turbos arent that tolerable as the completely steel wheeled ones... Id lean towards the compressor wheel being made of nylon in the s2 having something to do with it as well.

if im spewing wrong info , il be more then happy to be corrected as I am fairly new to skylines myself.

Nylon is very very strong. Frankly, I have my doubts that air flowing back through the compressor will do any damage, as there is no load on anything. Actual compressor surge which occurs on throttle when the engine can't consume the air being generated by the turbo; that I could understand how it would damage things as there is significant load on the turbine and therefore the compressor.

But when the shaft is just free-wheeling in decel and off-throttle situations, there is very little resistance to the air flowing backwards. Perhaps on already weakened blades it might put enough stress on them to be the final straw on the camels back to cause major damage, but otherwise the wheels should be built to handle much more stress. The only harm I can see it doing is to performance.

And performance is good. Don't do flutter kids.

yes this is correct however there have been many failures , thought to have been caused by a blocked bov on series 2 ceramic wheeled skylines as opposed to much less failures to on the s1's . Like I said its still a hotly debated topic as to whether it does any significant damage (you'l hear the vl guys talk bout their hectic flutter setup running strong for 3 years on the stock turbo)...but Id rather keep away from that , fit a pod and just be content with the "whoosh" sound.

i for one would like to see these failures.... i have been around sau for quite a while now and i don't recall ever seeing 1 confirmed failure caused by a blocked bov.

also let's not forget R31 and Cefiro RB20 motors never had a bov from factory...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • I got back to Japan in January and was keen to get back on track as quickly as possible. Europe is god-awful for track accessibility (by comparison), so I picked up a first-gen GT86 in December just to have something I could jump into right away. The Skyline came over in a container this time and landed in early January. It was a bit battered after Europe, though—I refused to do anything beyond essential upkeep while it was over there. The clutch master cylinder gave out, and so did the power steering. I didn’t even bother changing the oil; it was the same stuff that went in just before I left Japan the first time. Naughty. Power steering parts would’ve cost double with shipping and taxes, so knowing I’d be heading back to Japan, I just postponed it and powered through the arm workout. It took a solid three months to get the car back on the road. Registration was a nightmare this time around. There were a bunch of BS fees to navigate, and sourcing parts was a headache. I needed stock seats for shaken, mistakenly blew 34k JPY on some ENR34 seats—which, of course, didn’t fit—then ended up having the car’s technical sheet amended to register it as a two-seater with the Brides. Then there’s the GT86. Amazing car. Does everything I want it to do. Parts are cheap, easy to find, and I don’t care what anyone says—it’s super rewarding to drive. I’ve done a few basic mods: diff ratio, coilovers, discs, pads, seat, etc. It already had a new exhaust manifold and the 180kph limiter removed, so I assume it’s running some kind of map. I’ve just been thrashing it at the track non-stop—mostly Fuji Speedway now, since I need something with higher speed after all that autobahn time. The wheels on the R34 always pissed me off—too big, and it was a nightmare getting tires to fit properly under the arches. So I threw in the towel and bought something that fits better. Looks way cleaner too (at least to me)—less hotboy, less attention-seeking. Still an R34, though. Now for future plans. There are a few things still outstanding with the car. First up, the rear subframe needs an overhaul—that’s priority one. Next, I need to figure out an engine rebuild plan. No timeline yet, but I want to keep it economical—not cutting corners, just not throwing tens of thousands at a mechanic I can barely communicate with. And finally, paint. Plus a bit of tidying up here and there.  
    • Nope, needed to clearance under the bar a little with a heat gun, a 1/2" extension as the "clearancer", and big hammer, I was aware of this from the onset, they fit a 2.0 with this intake no problems, but, the 2.5 is around 15mm taller than a 2.0, so "clearancing" was required  It "just" touched when test fitting, now, I have about 10mm of clearance  You cannot see where it was done, and so far, there's no contact when giving it the beans Happy days
    • It's been a while since I've updated this thread. The last year (and some) has been very hectic. In the second-half of 2024 I took the R34 on a trip through Germany, Italy, France and Switzerland - it was f*cking great. I got a little annoyed with the attention the car was getting around Europe and really didn't drive it that much. I could barely work on the car since I was living in an inner-city apartment (with underground parking). During the trip, the car lost power steering in France - split hose - and I ended up driving around 4,000kms with no power steering.  There were a few Nurburgring trips here and there, but in total the R34 amassed just shy of 7,000kms on European roads. Long story short, I broke up with the reason I was transferred to Europe for and requested to be moved back to Japan. The E90, loved it. It was a sunk cost of around EUR 10,000 and I sold it to a friend for EUR 1,500 just to get rid of it quickly. Trust me, moving countries f*cking sucks and I could not be bothered to be as methodical as I was the first time around.
    • I assume clearances were all a-okay?
    • Shock tower brace is in +5Kw....LOL  
×
×
  • Create New...