so i was going to pass a mustang earlier today.. dropped 3rd gear cuz he started to speed up when i went passed him and the lane was changing.. car boosted fine.. all good then suddenly.. no boost.. so my thoughts.. i blew off a line... so get to my destination and check all the lines and nothings popped off nothing is loose.. so i take my car home.. this whole time that car is running fine just no boost... starts right away runs great.. just no boost... so i get it home and do a pressure test on all my intercooler piping from turbo charge pipe to tb pipe.. hmmm no leaks... tried to do it from the inlet of the turbo but it just bubbles through the return line.. always has (i think)... so i take apart my bov.. notice that the o ring has slipped off.. so i fix it and take it out to test it... nope no boost... so then i check every vacuum line by plugging one side and putting vacuum to it.. all holds good.. (now if i put vacuum on just one side of any vacuum line and dont disconnect the other side so it runs through my intake and engine or what ever it runs through it doesnt hold the vacuum) is that normal? but so i continue searching.. take of my wg and take it apart.. nope all good there.. no leaks and seems to be actuating when put under vacuum.... after all this i took it back out and still no boost.. so i turn off the bc and still no boost... any ideas? im stumped why would it suddenly have no boost and run just fine? if the turbo seals were bad wouldnt it smoke all the time? im out of ideas... what could it be?

Check the turbo seems like it locked up and is touching the housing :(

or wastegate stuck open

checked both... sorry forgot to metion that.. turbo spins by hand as well as when car is running.. and wastgate is not stuck open.. checked that too..

And the car idles fine?

I would check all boost piping again and make sure there are no holes in the couplers

yep idles perfect.. checked it 3 times.. it holds 30psi for over 5 mins.. then i figured that was good enough to know thats not the prob..

what's your timing at during these WOT pulls?

now i do get a lot of smoke when i first start the car if its been sitting for a bit... sometimes.. i was blaming that on the 116 race fuel i put in it last friday.. (5 gallons mixed in)... but it goes away shortly and doesnt come back... and it doesnt always smoke.. just seems to be when it wants to.. but only once per time it chooses too.. smokes then goes away and doesnt come back unless i shut off the car and again its only sometimes..

what's your timing at during these WOT pulls?

i have no idea.. j&s isnt doing anything and if timing was off wouldnt it run bad? it runs like a non boosted car.. and my boost gauge reads 0 in wot.. and 20 vac under idle.. pulls just fine under wot just not nearly as powerfull as before..

out of ideas for the night ill check back in the a.m.

I would datalog a pull and maybe send it to Tom and see if your PCM is doing something funny. Sounds like you've exhausted all other options at this point. Hope you figure it out man.

i have a feeling its the turbo.. not sure though.. its got to be something with the turbo setup.. but the last time my turbo went it was a gradual thing.. and you could feel it in the propeller it would get hung up.. and act funny.. now its just simply acting like a non boosted car.. its very odd..totally normal just without boost...

you said the turbo spins freely. is there any shaft play? side/side or in/out? fins look ok?

Alright, well you can rule out something internal in the engine. If you had terribly low compression the car wouldn't run.

As for spark, it would appear normal. Datalog may not show anything weird, but you can try. On the physical side of things, if you were getting spark blowout, you would still be seeing boost.

Does your AFR shoot to where it's supposed to at WOT?

If your wastegate is not stuck open, then it means the turbo is not creating boost, as you said before. Kinda weird that you had this problem already. If you were having housing contact, *you would hear it*. My turbo sounded *terrible* when the wheel was hitting the housing. It was louder than my exhaust and people were staring at me. It would still spool up, though, even if it resisted it.

you said the turbo spins freely. is there any shaft play? side/side or in/out? fins look ok?

very minor shaft play.. housing and fins look perfect.. and the last time my bearings went out on this turbo and i had it rebuilt the shaft play it had it would still try to boost it was just very slow at it and it would studder too.. and when you tried to turn it by hand it would get stuck.. this time none of that...

Does your AFR shoot to where it's supposed to at WOT?

yep perfect 10s in wot flat line when i let off..

If your wastegate is not stuck open, then it means the turbo is not creating boost, as you said before. Kinda weird that you had this problem already. If you were having housing contact, *you would hear it*. My turbo sounded *terrible* when the wheel was hitting the housing. It was louder than my exhaust and people were staring at me. It would still spool up, though, even if it resisted it.
sounds normal.. no weird sounds.. it sounds and feels like the vacuum line popped off the top of the wastegate but i checked that line very thoroughly... and when i took off the wg it was closed and actuated perfectly put under a vacuum on both sides...

Check the exhasut side of the turbo, you could of snapped the shaft in half ( i have this happen on a turbonetics i was running)

if that was the case then how could the turbo still keep turning?

There are two sets of bearings that hold the shaft in place. I would jus check it to be sure

How about your boost gauge? is that working properly? (only other thing I can think of that wasn't said)

I know you said you checked all the vacuum lines, and that they haven't come off. But have you checked them all to make sure there are no holes or cuts that might be causing a boost leak?

How about your boost gauge? is that working properly? (only other thing I can think of that wasn't said)

i would hope he would be able to tell the diff in 400whp and 120whp. lol

I know you said you checked all the vacuum lines, and that they haven't come off. But have you checked them all to make sure there are no holes or cuts that might be causing a boost leak?

it would have to be huge hole. a cut or a vacuum line would not prevent a turbo from making boost. it is surprising how much air they flow. it would have to be a something very noticeable, like a charge pipe separated. and he has done a boost leak test already. if it were after the tb if would not run b/c it would have to be a huge vacuum leak.

man this is weird. are there any blades left on the impeller on the exhaust side.

x2 on the exhaust side, whats it look like?

X2 on snapped shaft, I've done it twice w a vg30det 300zx w/ stock T3 and Super60

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man this is weird. are there any blades left on the impeller on the exhaust side.
havent pulled the hot side off yet.. i have been talking to comp turbo and they say check the bolts on the flange for the turbo compressor housing to hot side.. i have not checked that.. and update.. as i was driving it it sounds like its trying to boost but its being released.. it sounds exactly like someone blowing over a open bottle top when i get over 10mmhg of vacuum.. still no boost but hopefully i get the chance tonight to get outside and check the bolts on the turbo.. plus if that doesnt work then im going to disconnect the lower line on the wg and the line on the bov and see what happens.. dont worry ill keep an eye on boost.. all i need to see is if one or the other causes it to build boost.. dont need to run it long or hard for that.. if thats the case then it will let me know what is the prob.. and about the shaft it is still a single shaft on mine and if one side is broken it will not allow the other side to work.. i discussed this with Justin at comp turbo and he agrees.. it would not spool or spin at all if shaft or bearings were messed up..

Mine spun with a broken shaft because it took a chunk out of the shaft but still spun, but check it out

Mine spun with a broken shaft because it took a chunk out of the shaft but still spun, but check it out
if all the things i listed do nothing then the turbo is coming off.. or at least the hot side.. i plan on fixing this and ill figure it out eventually.. i appreciate all the help so far.. keep the ideas coming.. maybe well find something i havent thought of yet..

Engine gnomes. They always get me too. I hate those bastards.

Engine gnomes. They always get me too. I hate those bastards.

LOL

im pretty positive its either has not blades on the hot side (melted) or broken shaft

If the shaft was broke wouldnt it have some serious in and out play???

not necessarily, i have seen several turbos after alot of heat cycles actually cease onto the bearing center section and have to be pressed off

not necessarily, i have seen several turbos after alot of heat cycles actually cease onto the bearing center section and have to be pressed off
again it wouldnt turn then.. i agree with orange if it was anything to do with shaft it wouldnt turn right.. my last one was that way.. and it spins perfectly.. well when i get some time to look it over ill check it all out.. maybe tomorrow night.. (maybe) i hope..

ok so got out there to look at it (figured there was no point in going to bed today after i finished my home work got done at 0400 and have to leave for class at 0530.. i hate nursing school)...tighted the bolts .. nothing.. disconnected bov.. nothing... disconnected bottom of wg.. and still nothing.. so i guess turbo is gonna have to come off..grrr.. i dont have time to mess with that... oh and the smoking seems to be getting longer and more profuse.. im starting to think the seals on the turbo went... guess after i get home from calss tomorrow im going to have to go and get a pipe made to take the place of the turbo until i can get it fixed.. it cant be anything else.. its got to be the turbo.. good thing its still under warranty..lol..

Warranty FTW lol

If it was the seals it would still make boost.

And if the seals went you would be smoking all the time. At least mine did with my turbonetics.

If it was the seals it would still make boost.
In a way, he is... he said the boost gauge is reading 0psi at WOT. If the turbo wasn't pushing any air, the gauge should read more than 20in vac at WOT (if it's tapped into the intake manifold, anyway).

So that leads to another question... where is your boost gauge line tapped into?

It wouldn't show 20 in at wot.......
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If it was tapped into the manifold, wouldn't the increased engine speed cause more vacuum?

Actually you will loose vacuum at WOT in NA form.

You would see right at 0psi. I ran while I was doing my build I installed my BC while na still and saw 0 at wot
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Oh, I'm an idiot... the throttle plate is open. http://bbs.rsownersclub.co.uk/images/smilies/rsoc/dohhh.gif

*tries to sneak away*

haha we all have doah moments sometimes.

im pretty sure its turbo.. and i talked to justin at comp turbo again today and he said take it off and send it to them thell figure it out and fix it free of charge.. just have to pay shipping.. at least there.. so right now im running off no sleep waiting for my car to cool off enough so that i can take off the down pipe and see what the hot side looks like.. im kinda excited to see whats going on.. its got us all stumped.. (story of my car)...lol... i should call it the stumpmobile... it has not a problem you can solve...lol

ok.. so took off turbo.. and nope no broken shaft.. although there is alot of shaft play both side to side and up and down.. upwards of 1/16 in or more.. and when i try to spin it by hand you can hear something in there sounds like its nicking something.. to me though it still should boost a little bit... right? this doesnt make any sense.. this would be 2 times of haveing to get it fixed with in 10k miles.. i thought garrette turbos were suppose to be the ones you want to get to make it last forever...

well if it makes you feel any better my v8 is blowed up and i went and rode my bike for a few hours last night and wadded it up in a ditch, lol. gotta get all that shit fixed.

well if it makes you feel any better my v8 is blowed up and i went and rode my bike for a few hours last night and wadded it up in a ditch, lol. gotta get all that shit fixed.

Whattttt Tim you serious im guessing your ok since your on here lol shit sucks man

yeah im fine just went sliding through the woods about 70mph on my back. havent even got a scratch. bike is not so pretty any more but it is mainly cosmetic.