Jump to content
SAU Community

Recommended Posts

I recently discovered something interesting regarding aftermarket BOV's and mentioned it in another post, however I thought more of you guys would read this fresh post and possibly benefit from the finding; that is if you don't already know about it.

It is regarding the turbo flutter which seems to happen a lot in many driving styles and situations. Being an auto they do tend to flutter a bit as we don't always come off throttle completely (not in the way you would in a manual anyway). The flutter sound is created by the turbos impeller 'chopping' up back pressure that is not released by the bov. This is not good for any turbo as it creates opposing forces on the impeller and bearings and would most likely reduce the life of a turbo.

The standard pressure hose going to the bov has a restrictor in it. It is about a third in from the end of the hose. The restrictor reduces about 4mm diameter down to about 1mm and would reduce the pressure sent to the bov to actuate it and therefore, having an aftermarket bov which usually have stiffer spring rates and are harder to open will not open or not open enough except when controlling the accelerator with a bit of gusto.

I replaced the hose with fuel line hose and noticed the difference immediately. I'm not sure how much you guys would notice due to us all having different setups, but I thought it would be worth a shot if it means prolonging the life of your turbo and having a more enjoyable ride.

post-29959-0-00362800-1401461721_thumb.jpg

post-29959-0-52531800-1401461750_thumb.jpg

post-29959-0-55075100-1401461907_thumb.jpg

I did this today, I still have a bit of pigeon noise, but from my short brap around the block it seemed less. It does seem to have smoothed out the stutter it had getting off throttle but until i drive along a 100km/h bit of road i wont know for sure.

I checked mine by squeezing all along the hose with pliers and couldn't find a restrictor, hose definitely looks factory. It's an Axis so maybe it's not on every model? Mine hardly stutters since I stiffened up the spring rate, it was heaps softer than the stock one before so I set it as close to the same as I could gauge and it made a big improvement with stuttering.

Just in case anyone else is looking for other ways to possibly improve the feel.

  • Like 1

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

    • 9" wheels are a little too wide for a RWD 32. They can fit. People have put R33 GTR wheels on 32s for years and years. But they are a very tight squeeze. This has been known for about 30 years. As I said - there is no difference between a 17 and an 18 in terms of what will fit. The rolling diameter needs to stay about the same as stock - not very much larger. If you increase that, you will start to have problems. If you increae rolling diamater at the same time as yo increase width, you will have problems earlier. as 9" wheels are pushing the boundaries already, you would need to be careful with tyre choice. I would put 8.5s on the front of mine, but would expect problems with 9s.
    • post up screen shots of your injector tables
    • Diagnostic flow for a code 21 says check signal at the ECU pins, on a voltmeter of some kind it should read 0.1V at idle, 0.12V cranking, 0.15-0.25V at 2000 rpm. Check each coil such that +1, -3 is infinite or very high resistance, -3, +2 should do the same. (-1, +3), (+3, -2), (+1, -2), and (-1, +2) should all be somewhere between 0 ohms and high resistance. If you trace the path from the coil pin all the way back to the ECU in the diagram the resistance you measure at the coil vs connected to the harness should be pretty much the same. 
    • I have an elite 2500 running an adapter harness on an rb25de neo r34. I took the butterfly out and removed all that junk. But I also went Plus+t at the same time. The butterfly thing works in reverse to the boost solenoid on the Gtt if that makes sense
    • yeh they are 235/45/17 up front and 255/40/17 in the rears. I still didn't get my answer if i can fit a 18x9 up front. I want to get 4 of this and see if they will fit before committing as they didn't see an 18x8 as an option but there is a 18x9.5 also.   Enkei RS05-RR 18x9 35mm ET 5x114.3 75.0 Bore Matte Gunmetal Wheel
×
×
  • Create New...