Thread: Boost pressure and smoking after service

Originally Posted by Ranga

After a recent service and tweaking, the 130 is going much better, but I noticed it's also bit more smoke when accelerating. They said this would happen, with the more you squeeze out of an engine, the more smoke you would get. I think I can live with it.

During the same service, the boost pressure has increased. It was almost maxxing out he 15psi gauge beforehand, but now is maxxing it out, and I reckon it would be doing anywhere up to 20psi. Is this acceptable, and should I bother getting a bigger gauge?

....Get a bigger gauge, 15psi is peanuts

Seriously though, at least 16 to 19 psi is fine with a Tdi, the limiting factors here being intercooler flow and exhaust system etc etc. More importantly it should've been set up using a pyro and this will be the thing that needs to be right as engine damage will occur at high EGT's, not necessarily boost alone although they are linked together. I would DEFINATELY recommend one of these; http://www.thermoguard.com.au/ to help monitor the EGT's.

JC

with an aftermarket turbo and a bigger intercooler Ive heard tell of a tdi300 with 25psi running reliably....

right off the top the turbo on the tdi starts to drop efficiency at about 20psi.

Originally Posted by justinc

....Get a bigger gauge, 15psi is peanuts

Seriously though, at least 16 to 19 psi is fine with a Tdi, the limiting factors here being intercooler flow and exhaust system etc etc. More importantly it should've been set up using a pyro and this will be the thing that needs to be right as engine damage will occur at high EGT's, not necessarily boost alone although they are linked together. I would DEFINATELY recommend one of these; ThermoGuard Instruments to help monitor the EGT's.

JC

I've got an EGT gauge, which I keep an eye on. I've been intending to get a EMS2 Madman unit Home Page from NATA - plenty of diagnostics all in the 1 unit. Just trying to decide which shape to go for.

Anyone know the cheapest place to find another EGT gauge?

Originally Posted by Blknight.aus

with an aftermarket turbo and a bigger intercooler Ive heard tell of a tdi300 with 25psi running reliably....

[snip]

and the head gasket ??

I'd be O ringing at that boost, and, well I wouldn't anyway, I'd install a 4BD1 just for reliabilities sake.
I just can't believe a Tdi will hold together pumping out that sort of torque.

Having said that it still surprises me how well a Tdi goes with 17 psi and the fuel turned right up.

Originally Posted by rick130

and the head gasket ??

I'd be O ringing at that boost, and, well I wouldn't anyway, I'd install a 4BD1 just for reliabilities sake.
I just can't believe a Tdi will hold together pumping out that sort of torque.

Having said that it still surprises me how well a Tdi goes with 17 psi and the fuel turned right up.

Errrrr, Rick the terms 'Tdi' and 'Torque' aren't really to be used together after mentioning a 4BD1........especially a turboed 4BD1.

Yes possibly a steel shim head gasket on a Tdi would lengthen the inevitable happenning, but basically they would be pretty much near the edge of reliability at 20psi...especially accompanied by soaring EGT's.




JC

Originally Posted by rick130

and the head gasket ??

I'd be O ringing at that boost, and, well I wouldn't anyway, I'd install a 4BD1 just for reliabilities sake.
I just can't believe a Tdi will hold together pumping out that sort of torque.

Having said that it still surprises me how well a Tdi goes with 17 psi and the fuel turned right up.

I am not an egine builder so please excuse my ignorance. What is O ringing? I don't think it is using a rubber o ring, is it? Does it involve machining block and head to accept a sophisticated gasket?

O ringing is cutting a small groove in either the head face or the block face (usually easier) and inserting stainless steel wire that protrudes slightly above the surface.

It ensures a more positive seal for the head gasket under very high cylinder pressures.

Given I like my old iron engines Im still amazed that the heads stay together above ricer pressures let alone the head gasket..