Small 16g Turbo Whine HELP

[VLP]

I just installed my small 16g today and I have noticed a couple things that i am not sure about. First off is it doesn't seem to boost hard till 4k+ rpm and even then it doesn't seem to really pull hard. I don't have a lot done to the car, but it does have a tubular o2 housing and a turbo back 3" exhaust. Also, When on the highway today i noticed that when i got on it and the turbo started to build boost, sometimes it makes a high pitched whine noise. What could this be? The turbo has NO shaft play and seemed to spin great by hand with no rubbing. It is used, but looks BRAND new. I also looked for any cracks in the manifold and exhaust housing and found none.

Any help on this would be great.

 

[bluegs03]

im sure a ton of people will tell you this but ill be the first. Do a boost leak test, if you have a major leak it can affect spool up time. In order to get the spool up time down where are you feeding the turbo's oil from? It should be from the cylinder head, if not it might be receiving too much oil and causing a slow spoolup.

Also a little more info might be helpful how much boost are you running?

 

[fwdmaster]

If you hear a supercharger whine,you have a boost leak somewhere

 

[ricktb]

yeah either a boost leak, or a exhaust leak, or a bent shaft... I had a bent shaft in my evo 16g and made a god awful whine sound and didnt boost until higher up, and seemed to be weak boost... like 4-5 psi at 5K.. really bad

If you spin the compressor wheel does it appear to wobble off axis at all?

maybe also check the oil supply

 

[IEdroStarI]

hate to say it but definitely sounds like a BLT has to be done

 

[VLP]

Yeah, i will definately have to do one. the turbo doesn't wobble at all and i am running stock boost and oil is fed from the head. It almost seems like my wastegate is stuck open, i am running an ebay tubular o2 housing that is for a 14b, i assumed that it would work on the small 16g, it looked like it would work fine, but is the wastegate hole any different on the 16g? I am not sure how far the shaft should be out of the wastegate when it is in the closed position, i will have to check today. THANKS FOR THE HELP SO FAR!

 

[fox4]

Definitely the BLT is a must and if that doesn't get you anywhere do an exhaust leak test by running some seafoam through, if you don't know how to do this just search the forums for it there are a ton of threads on it.

 

[dsm-onster]

Glad you got your car up and running. I love the small 16g. I used it with that same manifold you have. Check my posts on the small 16g. I have a small 16g vs. big 16g comparison. They all use 7cm^2 turbine housings and all flow VERY well for their size. But hands down the small 16g uot performs the bigh 16g in every aspect but at the ABSOLUTE edge of the map. I'll take that over slower spool any day. The funny thing is that if you rewuire any more flow you can go tot the evo3 16g which spools just as fast as the big 16g. So there's really no place fore the big 16g any more. The small 16g spools faster in sacrefice for lower flow,a nd the evo3 16g matches the spool speed and flows more.

Did you use that 7cm^2 exhaust manifold and did you see how it matches your turbine housing inlet ?

 

[gofer]

def. test EVERYTHING for boost leaks like everyone said...
i had a similar problem and ran a complete BLT and still couldn't build any kind of boost until way high up in the RPM's, just sounded like a really loud whine of a supercharger. frustrated i pulled the turbo back off and took the thing apart, the guy i bought it from used RTV instead of a gasket to seal the CHRA to the compressor housing and it was blowing right by it. The turbo is sucking in all that air and blowing it right out the side, could be something similar going on as well.

Im running a small 16g with a BEP hotside and man that thing is MEAN, your going to love that turbo when you get it boosting like it should.
with that setup you might have boost creep issues as well, just be careful when you go WOT and its spooling right... it might just want to climb right up to 24psi which isn't good with the stock fuel setup.

 

[donniekak]

Check for boost leaks, and preturbo exhaust leaks. I usually get a piece of paper and hold it around the edges of the exhaust manifold and look for it to flutter.

 

[dsmfa9nutter]

Old post, I know, but for future reference, check the compressor fins. When they're bent goofy they'll cause an off-balance whine.