Pig rich under boost

[Richard930]

Need to see the AFRs.

Is it with Auguste?

[Kirk911SC]

Brent Hunter

[Richard930]

Even better - I'm a very happy customer of Brent's

[mark houghton]

Just got off the phone with the mechanic. He's taken the car for a short drive.

He said it doesn't seem to be a fuel issue, but a boost leak somewhere. Said it's way down on power. I stand by my first suggestion, at least until control pressure info is available to rule out the WUR. Of course, "way down on power" could be the result of way rich mixture too

For starters he thinks the wastegate (stock) is opening too soon or leaking.
Wastegate issue doesn't explain the smoke though?? Agreed. Black smoke = pig rich. A stuck open WG would just limit boost and power

With regards to the mixture screw - yes the filter was pushing on the screw when it was installed. Sort of pushing sideways on it, not down. I thought the allen screw (spring-loaded) had to be depressed fully to have any effect on the mixture? Yep, gotta push it down maybe 10mm or more before it contacts the control arm. You can feel when it reaches resistance. I wouldn't say it wasn't part of your problem, but not all of it

And the debate - and search - goes on! Are we having fun yet???? Your mechanic will sort it out I'm sure

[Kirk911SC]

I have the car back now.

Turns out that the wastegate plumbing was wrong, and has been that way since I got the car 6 years ago!

The adjustable boost controller was installed inline in the hose running from the bottom of the wastegate to the intercooler. The top of the wastegate was vented to atmosphere.

The mechanic re-plumbed the lines:

- Bottom of wastegate -> intercooler

- Top of wastegate -> Boost controller -> T-fitting (which he added) where boost sginal comes from

Car seems to come on boost sooner, but I haven't had a chance to really try it out. It's 41C (106F) with the humidity here today, so I'll wait until it cools down.

On the highway home I didn't feel any hesitation/stuttering as boost came on, but no WOT blasts yet.

Still not sure why I was seeing smoke??

I don't believe he checked the fuel pressures, but he seemed happy with how it started, idled and drove.

[quattrorunner]

106 in canada?!?!

[Kirk911SC]

Yep....3 months ago cars here (Toronto) still had their snow tires on!

[Richard930]

My car was showing 48 deg C for a little while, then it cooled off to 40 deg C! Unfortunately it ain't a dry heat either.

Maybe I do need to get the AC in the 930 working?