How do I cure a lean condition?

[whooppee777]

update please

[LtNoogie]

If it isn't raining too hard tomorrow, I'll see about routing the wideband harness through the firewall. I was going to clamp it to the end of my tailpipe to take a reading but remembered that on the automatic, the S/C does not engage in Park or Neutral so I'd only be reading NA operation.

[LtNoogie]

I finally got my vacuum/boost gauge and wideband a/f gauges installed and working. I really don't see a lean condition according to the wideband until I go into DFCO. According to the Autometer paperwork, I'm spending most of my time in a stoichiometric range.

Sometimes after WOT and releasing the throttle, the a/f mixture will briefly go rich. Perhaps there has never been a problem.

This video has been cross-posted in another thread. You won't want to watch it again.

http://www.youtube.com/watch?v=05RZSyraA5Y

[AlexNet0]

correctumundo^

[LtNoogie]

Really? So the dyno guy was correct? Where would one find the optimum a/f readings for engines under boost?

[largeorangefont]

Originally Posted by LtNoogie

Really? So the dyno guy was correct? Where would one find the optimum a/f readings for engines under boost?

There is a balance, and the key is really exhaust gas temperature, or EGT.

You can run a lean AFR, with retarted timing, and get acceptable EGT values.

You can run a richer AFR, with advanced timing and get the same acceptable EGT values.

The proper AFR for a forced induction car is debateable, but generally in the 11:1 -12:1 range is acceptable depending on type of forced induction and boost level.

I don't think blitz would send you out into the world with a tune that will pop the motor, but just be aware, the tune is far from its full potential.

[LtNoogie]

I found this to be an interesting read on the topic.

http://automotiveu.com/BlowerTuning.htm

[LtNoogie]

Ok. I was planning to run the SpeedVentures Streets of Willow on April 10 where I expect prolonged WOT operation and lots of boosting. Based on what you're telling me, that may not be a good idea until I get the AFR under control, right?

[largeorangefont]

Originally Posted by LtNoogie

Ok. I was planning to run the SpeedVentures Streets of Willow on April 10 where I expect prolonged WOT operation and lots of boosting. Based on what you're telling me, that may not be a good idea until I get the AFR under control, right?

No, I believe you will be ok. What I would do is get or borrow a fancy scangauge and monitor your timing. Compare it with a stock car and see if there is a difference. Then you will know what the black box is doing. If your timing is lower, you should be just fine.

I may be going to the April 10th day as well.

[LtNoogie]

I have a scangauge. Perhaps I'll make another video and strap the scangauge on top of the other gauges so that we can see how timing corresponds to AFR and boost levels.

What other scangauge settings would be useful to view? I have RPM currently showing also. I can ditch the two MPG settings for this video.

[largeorangefont]

Originally Posted by LtNoogie

I have a scangauge. Perhaps I'll make another video and strap the scangauge on top of the other gauges so that we can see how timing corresponds to AFR and boost levels.

What other scangauge settings would be useful to view? I have RPM currently showing also. I can ditch the two MPG settings for this video.

That is great!

RPM, ignition advance, injector duty or latency, and if there is a load, or airflow parameter, that would be perfect.

Or if you want to post a list of everything it can do I can tell you which ones you will want to monitor.

You have an auto right?

[LtNoogie]

Originally Posted by largeorangefont

That is great!

RPM, ignition advance, injector duty or latency, and if there is a load, or airflow parameter, that would be perfect.

Or if you want to post a list of everything it can do I can tell you which ones you will want to monitor.

You have an auto right?

Ok, I'll make a list tonight of the values it can display.

I know it can do RPM, ignition advance, and load. I don't think the other settings produce a value. Perhaps the ECU does not report them to the scangauge.

[largeorangefont]

Originally Posted by LtNoogie

Ok, I'll make a list tonight of the values it can display.

I know it can do RPM, ignition advance, and load. I don't think the other settings produce a value. Perhaps the ECU does not report them to the scangauge.

The ECU does report them, but the Scangauge probably does something to the value to get the fuel economy/fuel rate numbers.

What unit does the fuel rate parameter use?

[LtNoogie]

cpm... I think. I've never known what to do with that reading.

[LtNoogie]

I just use my cheap Olympus digital camera and run it in movie mode. Most all of the cameras have that mode.

[KCALB SIRAY]

I hear WalMart has a good deal on Hanna Montana designed vid cameras, lol.

[KCALB SIRAY]

lol

[LtNoogie]

I'll try to do a better job next time. Thanks.