might_e_mowse Posted November 19, 2008 Share Posted November 19, 2008 Hey, i have a t3/t4 and it seems not to spool whatsoever. When the car is off and i spin the compressor side it spins relatively freely, then when i turn the car on at idle it wont spin at all and when i try to spin in it it doesnt feel free at all, like its catching on something. If i raise the revs a little it will sometimes starts to rotate but if i give it a bit of help it will spin and remain spinning until i drop the revs back to idle. I havent hardly driven it as i dont want to do any damage but there is definitely oil going through the turbo and all the i/c lines are plumbed up without leaks. Im no turbo guru but shouldnt it spin, even very slowly, at idle? The turbo is second hand from a trustworthy seller and has very little kms on it. Any help appreciated Quote Link to comment Share on other sites More sharing options...
fuel Posted November 19, 2008 Share Posted November 19, 2008 weird why it wont spin with the motor running yet it spins if the motor is not running - only difference would be oil pressure going through the turbo, heat and possibly vibration. maybe some turbo gurus here can shed some light on this Quote Link to comment Share on other sites More sharing options...
might_e_mowse Posted November 19, 2008 Author Share Posted November 19, 2008 weird why it wont spin with the motor running yet it spins if the motor is not running - only difference would be oil pressure going through the turbo, heat and possibly vibration. maybe some turbo gurus here can shed some light on this Yeh i thought it was sumthing to do with the oil pressure as well and spent about an hour making sure there was oil flowing, but the old owner had same engine, oil lines, turbo, manifold etc and it supposedly ran fine the day before it came out. Quote Link to comment Share on other sites More sharing options...
forced Posted November 19, 2008 Share Posted November 19, 2008 Yet another problem that doesn't exist. Most turbos don't actually spin at idle. Most people don't know that. Idle being 750 ish revs, running properly , warmed up etc. Again most turbos, you'll notice them starting to rotate at maybe 1000 to 1200 rpms but then only slowish. They need full throttle. Steve Quote Link to comment Share on other sites More sharing options...
UTERUS Posted November 19, 2008 Share Posted November 19, 2008 On the previous car it was on, it wouldn't spin at idle. Take it for a drive, nail it, it will come on boost around 3500-4000. Ps, it will be laggy. Quote Link to comment Share on other sites More sharing options...
might_e_mowse Posted November 19, 2008 Author Share Posted November 19, 2008 hmm im still not too sure, i have taken it for a drive and it only boosted about 1psi im assuming as i could only just hear the bov go and had no pull at all. But something i just realised is that it was twin turbo so i have just plugged up one oil feed and one oil return, will this cause the oil pressure to rise too high? maybe the oil pressure being higher gives it more resistance to spin at idle. If so could i just change the oil connections to a narrower hole limit the oil flow to the turbo a little more? Quote Link to comment Share on other sites More sharing options...
isnowi Posted November 19, 2008 Share Posted November 19, 2008 If your oil pressure was too high the oil would most likely bypass the seals and you would have smoke for africa. Have you go a boost gauge? Are you sure that there are no exhaust leaks or intake leaks? Do the turbine and compressor wheels spin in unison, ie are they both attached to the shaft? Quote Link to comment Share on other sites More sharing options...
Hemi Posted November 19, 2008 Share Posted November 19, 2008 If your oil pressure was too high the oil would most likely bypass the seals and you would have smoke for africa. Have you go a boost gauge? Are you sure that there are no exhaust leaks or intake leaks? Do the turbine and compressor wheels spin in unison, ie are they both attached to the shaft? as stupid as that may sounds ive had it happen before Quote Link to comment Share on other sites More sharing options...
might_e_mowse Posted November 19, 2008 Author Share Posted November 19, 2008 If your oil pressure was too high the oil would most likely bypass the seals and you would have smoke for africa. Have you go a boost gauge? Are you sure that there are no exhaust leaks or intake leaks? Do the turbine and compressor wheels spin in unison, ie are they both attached to the shaft? Yeh i have a boost gauge but not hooked up yet, i will 2moro and see what it reads. But yeh its not smokey at all. Nope no exhaust or intake leaks. Im not sure whether the turbine and compessor wheel spin in unison now but they did 2 weeks ago before i got the exhaust plumbed up. Surely it would be a hell of a mission for the compressor and turbine to dislodge themselves from the shaft right? Quote Link to comment Share on other sites More sharing options...
Hemi Posted November 19, 2008 Share Posted November 19, 2008 If your oil pressure was too high the oil would most likely bypass the seals and you would have smoke for africa. Have you go a boost gauge? Are you sure that there are no exhaust leaks or intake leaks? Do the turbine and compressor wheels spin in unison, ie are they both attached to the shaft? Yeh i have a boost gauge but not hooked up yet, i will 2moro and see what it reads. But yeh its not smokey at all. Nope no exhaust or intake leaks. Im not sure whether the turbine and compessor wheel spin in unison now but they did 2 weeks ago before i got the exhaust plumbed up. Surely it would be a hell of a mission for the compressor and turbine to dislodge themselves from the shaft right? when they do you know about it , especially with the speeds they spin at , and the compressor nut is a left hand thred anyhow which prevents such things happening .. but it still does either way you will know cos ittl whine like a bitch when it does spool up Quote Link to comment Share on other sites More sharing options...
might_e_mowse Posted November 19, 2008 Author Share Posted November 19, 2008 so is it normal to feel more resistance in the shaft when the engine is running? Can anyone shed any light on this? Quote Link to comment Share on other sites More sharing options...
Hemi Posted November 19, 2008 Share Posted November 19, 2008 so is it normal to feel more resistance in the shaft when the engine is running?Can anyone shed any light on this? i dont know about this cos even the turbo on trucks spin at idle and they are big motherfuckers, but they duty cycle is completly diff well are you spinning it the way the turbo normally would or against ??? , i cant really see any reason for resistance to pick up a hell of alaot cos number one you should have oil in it already , and number two most turbos ive looked at *and ive seen a fuckload* the oil is generally squirted onto it and not fed into the bearings so it sholdnt make much of a difference Quote Link to comment Share on other sites More sharing options...
might_e_mowse Posted November 19, 2008 Author Share Posted November 19, 2008 so is it normal to feel more resistance in the shaft when the engine is running?Can anyone shed any light on this? i dont know about this cos even the turbo on trucks spin at idle and they are big motherfuckers, but they duty cycle is completly diff well are you spinning it the way the turbo normally would or against ??? , i cant really see any reason for resistance to pick up a hell of alaot cos number one you should have oil in it already , and number two most turbos ive looked at *and ive seen a fuckload* the oil is generally squirted onto it and not fed into the bearings so it sholdnt make much of a difference Im spinning it the right direction (clockwise). Yeh if anythin i would have thought that the resistance would decrease with the engine running but it has noticably more resistance. The more i look into this the more i think i was jus too much of a bitch when i drove it but im sure i took the revs up to at least 5000rpm (no tach) with no boost response. Well here is a pic to give you an idea, you can see where the oil line goes into the side of the head, just further back is the other oil outlet which i have blocked up. Oh and take no notice of the blocked hose coming out of the top of the wastegate, that was a mates failed idea and has been since removed. Quote Link to comment Share on other sites More sharing options...
Hemi Posted November 19, 2008 Share Posted November 19, 2008 have you tried holding it at high idle and such?? somehting is either terribly wrong or something so stupidly simple has been overlooked and cos im not there and i havent run across this problem before i cant help a great deal sorry Quote Link to comment Share on other sites More sharing options...
might_e_mowse Posted November 19, 2008 Author Share Posted November 19, 2008 have you tried holding it at high idle and such?? somehting is either terribly wrong or something so stupidly simple has been overlooked and cos im not there and i havent run across this problem before i cant help a great deal sorry Nah cheers mongol, yeh ive tried holding the throttle open a bit. Im hoping something stupid has been overlooked, but it looks like ill be taking it all apart (AGAIN!) and slowly ticking things off that it cant be. Quote Link to comment Share on other sites More sharing options...
l1ttle_d3vil Posted November 19, 2008 Share Posted November 19, 2008 the turbo should spin freely by hand any time I guess, when mines idling it doesn't spin - but I could spin it by hand if i want. but if i snap the throttle really quickly and let the revs drop back, it will start spinning. Quote Link to comment Share on other sites More sharing options...
isnowi Posted November 19, 2008 Share Posted November 19, 2008 Is your oil feed got oil flowing through it? Sometimes taking a feed in the top of the head will yield very little oil pressure or flow. Just thinking aloud, ignore me if i'm stating the obvious and you have already checked all these things. Cheers, Dan Quote Link to comment Share on other sites More sharing options...
forced Posted November 19, 2008 Share Posted November 19, 2008 i dont know about this cos even the turbo on trucks spin at idle and they are big motherfuckers, but they duty cycle is completly diff Diesels don't have a throttle so they suck in lots of air even at idle. It has to get out again . Steve Quote Link to comment Share on other sites More sharing options...
fuel Posted November 19, 2008 Share Posted November 19, 2008 mine will move at idle but not spin whole revolutions at a time - but if you blip the throttle as above it will spin momentarily. Quote Link to comment Share on other sites More sharing options...
lowlancer Posted November 19, 2008 Share Posted November 19, 2008 So, it's just not spooling at all? Wastegate stuck open or something dumb? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.