Jump to content
SAU Community

The Super Easy Boost Mod. Did I Get It Wrong?

zoomzoom

By zoomzoom,
in Four Door Family & Wagoneers

 Share

Recommended Posts

zoomzoom Mentor

zoomzoom

Posted
Posted (edited)

OK so i ive removed the boost solenoid from the wastegate setup and my setup is now as follows

.............................................(T-connector)

(Post-intercooler pipe) ========+=========------->(wastegate)

.................................................||

.................................................||

.................................................||

.................................................( ) <--Restrictor

.................................................||

.................................................||

.................................................||

.................................................||

.................................................\/

.................................(Pipe back to turbo inlet)

Ok so my understanding is that the wastegate spring opens at 5 psi. therefore with my setup the line with the restrictor should bypass some pressure, keeping the wastegate shut past 5 psi and creating more boost.

however the turbo is not going past 0.4 bar or around 5.8 psi. ive drilled the restrictor to over 2.6mm and its still not giving any more than 0.4 bar. i dont get that, the line should be bleeding off plenty of pressure by now. in fact id expect it to be over boosting, but its not giving me anymore. WTF?

can someone shed some light here? am i boost-tarded or missing something here?

Edited by zoomzoom
KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted
OK so i ive removed the boost solenoid from the wastegate setup and my setup is now as follows

.............................................(T-connector)

(Post-intercooler pipe) ========+=========------->(wastegate)

.................................................||

.................................................||

.................................................||

.................................................( ) <--Restrictor

.................................................||

.................................................||

.................................................||

.................................................||

.................................................\/

.................................(Pipe back to turbo inlet)

Ok so my understanding is that the wastegate spring opens at 5 psi. therefore with my setup the line with the restrictor should bypass some pressure, keeping the wastegate shut past 5 psi and creating more boost.

however the turbo is not going past 0.4 bar or around 5.8 psi. ive drilled the restrictor to over 2.6mm and its still not giving any more than 0.4 bar. i dont get that, the line should be bleeding off plenty of pressure by now. in fact id expect it to be over boosting, but its not giving me anymore. WTF?

can someone shed some light here? am i boost-tarded or missing something here?

Your diagram is correct so if you have connected from the intercooler pipe to the actuator with a bleed going back to the bov return pipe then I would expect better than 0.4 bar. Is this true all the way to 7000rpm? i.e. does it not increase with high revs? You could try a simple experiment - pull the hose off the actuator and try it carefully at first and then with more and more and see if your boost goes up. If it doesn't then you have to find out why - turbo no good, intercooler leaking, hoses leaking wastegate stuck open? If the boost does go up with the actuator disconnected then maybe the actuator (spring) is stuffed.

zoomzoom Mentor

zoomzoom

Posted
  • Author
Posted

ok i had a good chance to test it today. i took the bypass restrictor off, so it should have been keeping the wastegate closed the whole time, yet it would not boost past 0.5bar

i sure hope it wasnt a pressure leak in the intake because that would have spun the turbo very fast :)

so, where am i left now, how do i go about testing the turbo? shaft play?

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted
ok i had a good chance to test it today. i took the bypass restrictor off, so it should have been keeping the wastegate closed the whole time, yet it would not boost past 0.5bar

i sure hope it wasnt a pressure leak in the intake because that would have spun the turbo very fast :bomb_ie:

so, where am i left now, how do i go about testing the turbo? shaft play?

Did you try pulling the hose off the actuator (and perhaps plugging all the hoses)?

If you get stuff all boost then check for leaks and unless anyone has a better idea it may be turbo off time. Or see if the actuator is stuck.

zoomzoom Mentor

zoomzoom

Posted
  • Author
Posted

bad news im starting to think.

i havent noticed before but i found black oil dripping from the rubber coupling on the air intake just before the throttle body. its dripped onto the cam cover

post-46287-1225867697_thumb.jpg

excess oil in the intake? bad turbo seals? i not sure if the turbo is bad, ive never seen smoke on startup

RBPOWA-(TJ) Grand Master

RBPOWA-(TJ)

Posted
Posted

dont mean to alarm you, but i think there was a thread somewere recent with the same kinda oil leak, think it came down to turbo is near its due date :S

found that link http://www.skylinesaustralia.com/forums/Oi...er-t242873.html

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Dose Pipe Sutututu
      NC MX5

      By Dose Pipe Sutututu · Posted

      The German place in Cabramatta was rock solid, fresh pretzel cooked to order back then. Then it went all quiet, after all the poker machines were removed, then I believe it closed for good. I did drive past the other week and noticed outdoor lighting a big screen, but no idea what is there now.  
    • joshuaho96
      R33 GTR running -9 with no tune

      By joshuaho96 · Posted

      Yeah I suspect even if you hold airmass per cycle/cylinder constant if you get too far away from stock you're still going to have problems running the factory tune within the bounds of the factory load scale. Cams, different displacement/rod ratio, etc. I'm just lucky that the GTIII-SS with wastegate boost + CA compliance cats is pretty much equivalent to stock turbos. When I have actual space I can finally get it tuned and modify the fuel system for flex fuel to 100% handle any detonation concerns when cranking the boost to whatever those dinky turbos can put out.
    • The Bogan
      NC MX5

      By The Bogan · Posted

      I would say no, why, because my daughter, who also lives in Goulburn, hasn't recommended us going there Pity, as we miss all the German joints around in Sydney, actually, the restaurants are the only thing I really miss about Sydney, and a special mention to Ishibanboshi at Bondi Junction, their Kara-age Don is heart cloggingly deliciousness (always added a special boiled egg...or 2) 😋 
    • GTSBoy
      NC MX5

      By GTSBoy · Posted

      Does that German restaurant still exist in the old place out the NW end of Goulburn? When I say "out the NW end of"...I am really being vague. It was 1997 when I was last there, and the only point of reference I can recall is that it was on the opposite side of the main drag from the big merino. And when I say "opposite side of the main drag", I don't mean "on the main drag". It was either a couple of streets back from there, or might have even been out in the sticks a bit further. Was an old farm building or mill or somesuch. And when I say "the big merino" I might actually be thinking of a completely different part of town, because I just looked on maps and the big bugger is not where I remembered him to be! The food was good, consisting largely of various German mystery-meat sausage/loaf things and kartofflen.
    • GTSBoy
      R33 GTR running -9 with no tune

      By GTSBoy · Posted

      So while the second sentence is completely correct and the whole point of the conversation, the first sentence bears consideration. If this bloke is just hoping to throw big turbos on and drive it around, because there are no helpful facilities at all in his tropical paradise** then he likely has zero chance of even knowing what the TP is on the last column in the stock maps, let alone know whether the ECU is operating anywhere near it or past it. So the point is very very moot. And, per what I said before, at stock boost on those turbos, you may well be off the end of the map. **I'm just back from Vanuatu, so I know exactly what small Pacific nations can be like wrt paradise without requisite facilities. But it's not even that simple. I put a high flow on my car and had to drive it around without a proper tune because of the lack of opportunity*** to put the bigger AFM and injectors into it to allow it to be tuned. I had to turn the boost down to less than I had before, and back off the boost controller's ramp, because it was exploring parts of the map that it didn't drive in before, and really couldn't access for tuning on the dyno either, and so was pinging. It was still well within the last column, because when I first**** set up the Nistune on the Neo I rescaled all axes of the maps to give some more space to explore. ***Family dyno was broken ****This was 13 years ago, and the TIM thing wasn't a thing then and so TP would definitely grow when pushing past the stock tune's limits.
×
×
  • Create New...