Do JB turbos spin at idle?
#1
Elite Member
Thread Starter
iTrader: (9)
Join Date: Jul 2007
Location: NYC
Posts: 5,710
Total Cats: 3
Do JB turbos spin at idle?
I finally got all my **** in my car and fired it up.
I had my friend stand and look at the turbo as I started the car up and it spun for a split second then stopped. I let the car continue to run and at idle it would not spin. As soon as I gave it a little bit of gas it spins, back to idle it stops.
I checked that it is getting oil by removing the oil drain and putting the line in a bucket, at idle its a nice stead flow.
Normal?
I had my friend stand and look at the turbo as I started the car up and it spun for a split second then stopped. I let the car continue to run and at idle it would not spin. As soon as I gave it a little bit of gas it spins, back to idle it stops.
I checked that it is getting oil by removing the oil drain and putting the line in a bucket, at idle its a nice stead flow.
Normal?
#6
My t3/t4 always spun at idle - even when there was so much play in it the compressor blade would hit the housing. Don't have it installed, but my brand spanking new t3/t4 doesn't spin manually nearly as easy. Loose bearings spin easy. Since you've checked oil flow, I wouldn't worry about it unless there's excessive bearing play.
For comparison, here's oil flow w/o restrictor on a t3 center section:
and a manual spin on the same turbo with excessive bearing play:
For comparison, here's oil flow w/o restrictor on a t3 center section:
and a manual spin on the same turbo with excessive bearing play:
#11
That wheel stops a bit too fast...I would just keep an eye on it after some more runs and see if it loosens up...and yes it should spin at idle.
Spin it by hand and see if it's binding, or it's just tight. If it's tight it will loosen up and everything will be alright. If it's binding then the shaft is most likely bent..not good.
Tony
Spin it by hand and see if it's binding, or it's just tight. If it's tight it will loosen up and everything will be alright. If it's binding then the shaft is most likely bent..not good.
Tony
#12
Boost Pope
iTrader: (8)
Join Date: Sep 2005
Location: Chicago. (The less-murder part.)
Posts: 33,072
Total Cats: 6,625
It does seem to be spinning down a bit quickly. Mine spins freely at idle when the oil is hot. When it's cold, it spins only if you rev it. However I seem to recall that it does not stop quite that fast.
But I'd +1 what's already been said. If it feels tight, but it not binding in any one spot, then run it and see if it loosens up.
But I'd +1 what's already been said. If it feels tight, but it not binding in any one spot, then run it and see if it loosens up.
#13
Elite Member
Thread Starter
iTrader: (9)
Join Date: Jul 2007
Location: NYC
Posts: 5,710
Total Cats: 3
It does seem to be spinning down a bit quickly. Mine spins freely at idle when the oil is hot. When it's cold, it spins only if you rev it. However I seem to recall that it does not stop quite that fast.
But I'd +1 what's already been said. If it feels tight, but it not binding in any one spot, then run it and see if it loosens up.
But I'd +1 what's already been said. If it feels tight, but it not binding in any one spot, then run it and see if it loosens up.
I guess ill run it and see what happens. No point in taking it off for no reason.
That wheel stops a bit too fast...I would just keep an eye on it after some more runs and see if it loosens up...and yes it should spin at idle.
Spin it by hand and see if it's binding, or it's just tight. If it's tight it will loosen up and everything will be alright. If it's binding then the shaft is most likely bent..not good.
Tony
Spin it by hand and see if it's binding, or it's just tight. If it's tight it will loosen up and everything will be alright. If it's binding then the shaft is most likely bent..not good.
Tony
----
M2cupcar, thanks to your video on youtube I was able to tell if my oil flow was sufficient.
#16
Elite Member
Thread Starter
iTrader: (9)
Join Date: Jul 2007
Location: NYC
Posts: 5,710
Total Cats: 3
Damn I hope you guys are right. When I first got the turbo I put some oil in it for storage and it would easily spin in my hands. Even felt a bit of shaft play, after the first start up I cant feel any shaft play and its hard to turn with my fingers. This is what got me worrying. I dont know if it has to do with the fact that it now has engine oil in it and not clean stuff from the bottle.
I dont know if its binding or not, doesnt seem to be and if it is its somewhere inside the thing.
I am also concerned about oil flow. Yes there is a steady stream at idle(not as much as m2cup has though and I didnt rev to see if it increases) Tell me if I understand correctly. The newer the bearings the tougher it is for oil to flow through them because of clearances. Thats really the only idea I can come up with.
Can over tightening the turbine housing bolts cause this kind of problem?
I dont know if its binding or not, doesnt seem to be and if it is its somewhere inside the thing.
I am also concerned about oil flow. Yes there is a steady stream at idle(not as much as m2cup has though and I didnt rev to see if it increases) Tell me if I understand correctly. The newer the bearings the tougher it is for oil to flow through them because of clearances. Thats really the only idea I can come up with.
Can over tightening the turbine housing bolts cause this kind of problem?
Last edited by Saml01; 05-06-2008 at 03:14 PM.
Thread
Thread Starter
Forum
Replies
Last Post