Problem with B18c turbo


frendod_ek9

frendod_ek9

Vteeeccc!!!
Joined
Sep 15, 2010
Messages
251
Hi, my friend just built a b18c turbo. Yesterday he got it on the dyno to tune it. While reaching about 4,500 - 5,000 rpm ( reached 7psi ) HEAVY smoke was coming out of the exhaust, so the tuner stopped. We thought that the problem was the turbo seals because the smoke was coming out ONLY while boosting. So when he got it back home, we decided to remove the downpipe to see if there was any signs of oil leaks from the turbo, but there wasn't any. The block is sleeved, Cp pistons 10.1, precision turbo 6776 .82A/R. ( I'm not pretty sure about the turbo, I will ask him again what's the model exactly ). The coolant is ok, no signs of anything wrong. Any help what the problem might be guys?
 
Wiggle the turbo wheel inside and see if there is excessive movement.
Tiny bit side to side is okay like 1mm but any in and out and it needs a rebuild.
 
jesse888 said:
Wiggle the turbo wheel inside and see if there is excessive movement.
Tiny bit side to side is okay like 1mm but any in and out and it needs a rebuild.
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it does have a bit side by side movement but it's normal. it does not have inwards and outwards movement
 
Are you lifting the head on boost? Head studs torque to correct spec?
Sleeves fitted correctly?

Murray
 
we are going to remove the head, sleeves fitted correctly...suppose. we used arp studs. will keep you updated. thanks
 
We just did a compression test. 3 cylinders are over 13bar, but cyl. no.2 was found 11.7bar. I think before removing the head, we better run a leak down test.
 
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had a problem much the same when i built my b18 turbo,turned out my oil pressure was far to high so had to fit oil pressure restrictor. sounds like it could be similar as would only start smoking around 4000rpm.
 
lyle robb said:
had a problem much the same when i built my b18 turbo,turned out my oil pressure was far to high so had to fit oil pressure restrictor. sounds like it could be similar as would only start smoking around 4000rpm.
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X2 A lot of people forget about oil restrictors, that would be my first port of call.
 
What they are saying is the oil pressure from the engine is too much for the seals in the turbo. Easy fit by getting an oil feed with a smaller hole in the bolt. This restricts the pressure from going into the turbo and breaking the seals.
 
frendod_ek9 said:
The oil it has is 10w60, and the tuner suggested to use 20w50. Any suggestions?
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If its white smoke then you are burning coolant!

And what turbo is it? Ball bearing journal bearing? You have to use the correct oil restrictor for the turbo, otherwise excessive oil pressure will go through the turbo seals.

Have a look at the coolant level, does it go down and require topping up?
 
like everyone else said if its a ball bearing turbo contact precision to find out what size restrictor it needs, also has the head been rebuilt? Could be excessive blow by through the valve stem seals. Does the car have positive crank case ventilation or is it using the stock PCV valve?
 
turbo is probabley a 6766, if it is it would have come from precision with a restrictor fitted, I have heard people having problems with these so decided myself to use a -3 oil feed hose instead of the usual -4.

Your compression test results don't sound good though, what head gasket was used? o.e over bored or cometic? Who installed the sleeves?
 
Saifskyline said:
If its white smoke then you are burning coolant!

And what turbo is it? Ball bearing journal bearing? You have to use the correct oil restrictor for the turbo, otherwise excessive oil pressure will go through the turbo seals.

Have a look at the coolant level, does it go down and require topping up?
Click to expand...

The coolant is ok. It does not go down and doesn't require topping up.

blinx9900 said:
like everyone else said if its a ball bearing turbo contact precision to find out what size restrictor it needs, also has the head been rebuilt? Could be excessive blow by through the valve stem seals. Does the car have positive crank case ventilation or is it using the stock PCV valve?
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It has the T1 catch can installed, the one with 3 filters on top.

rs250nut said:
turbo is probabley a 6766, if it is it would have come from precision with a restrictor fitted, I have heard people having problems with these so decided myself to use a -3 oil feed hose instead of the usual -4.

Your compression test results don't sound good though, what head gasket was used? o.e over bored or cometic? Who installed the sleeves?
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It has the cometic head gasket installed, and benson's sleeves. The block was bought from the states sleeved.

My friend bought this engine already assembled. It used to run low 10's. They swapped everything from the previous car to my friend's car. So they left nothing out. The only bad thing he did was that the previous owner used to run it on racing fuel and before my friend installed it on his car it made about 6 months without working. So the problem might been done when the engine was laying on the floor for 6 months and more because he bought it in good working condition. I think it might be something with the racing fuel and those 6 months without working.
 
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i use cometic, i never had an issue with them, but a lot of people have... god i really feel for your friend, i had a similar issue on a turbonetics turbo that ended up being blown :( i have no idea what his issue is but i wish him well.
 
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