As much lean burn as you want?

[olrowdy01]

I'm curious, what is the ratio of lean burn time to purge time? I realize that it will vary with the current conditions but in general what is the time ratio?

Is it possible for the cat to get loaded up without purges so that it can't be cleaned up when purged later?

Final question, when using spark plug extenders on the 3rd O2 sensor to stop error codes would that have any affect on NOx purges?
TNX

[theaveng]

How long lean-burn is active is directly proportional to how much fuel you burn. The more you burn, the faster the NOx catalyst fillsup and needs to be purged (emptied)

Originally Posted by Eli

If you run 87 octane in your non-modified street car with modern ECM, it will retard the timing and everything will be fine. Of course, there will be exceptions to every rule..... It's very, very interesting watching the knock sensor in the Insight. It gets used much more than I ever thought it would. It's almost like it's used as a fine adjustment

Not really "fine". I've heard retarding the timing creates high heat and scorching inside the piston. Nothing mjaor but it will eventually cause wear. (2) If the insight uses the knock sensor so much maybe it needs a higher octane fuel? If you put 93 gasoline in there, maybe it wouldn't use the knock retard at all.

[theaveng]

Disabling the "rich burn purge" should be as easy as reprogramming the NOx catalyst sensor to always read "empty". Anybody figure-out how to do that?

[pascal28]

Originally Posted by uhtrinity

Disconnect the stock sensor by cutting the black and grey wires between the connector and the 2nd O2 sensor. Bridge those wires with the resistor. Again, I'm not sure how this will work with the cars with 3 O2 sensors.

Where are these wires? Do you have any pics of this mod?

[diamondlarry]

Originally Posted by theaveng

Disabling the "rich burn purge" should be as easy as reprogramming the NOx catalyst sensor to always read "empty". Anybody figure-out how to do that?

It would be fairly simple if it worked like that. However, from my experience and from reading different posts, the NOx level isn't directly measured but seems to be a calculated thing using time in lean burn and level of engine load. One of the reasons I think it works this way is because I can use my Calpod switch on my work commute to extend the distance I can stay in lean burn and if the NOx level were directly measured, I shouldn't be able to have any effect on that distance.

[uhtrinity]

Originally Posted by pascal28

Where are these wires? Do you have any pics of this mod?

Right at the sensor, I haven't taken any pics.

[Stueveo]

Originally Posted by diamondlarry

One of the reasons I think it works this way is because I can use my Calpod switch on my work commute to extend the distance I can stay in lean burn and if the NOx level were directly measured, I shouldn't be able to have any effect on that distance.

Can you elaborate more on this? Your process on achieving this additional lean burn time by using Calpod switch? I'm not familiar.

Also what's your theory behind how this works/lengthens between purges

[diamondlarry]

Originally Posted by Stueveo

Can you elaborate more on this? Your process on achieving this additional lean burn time by using Calpod switch? I'm not familiar.

Also what's your theory behind how this works/lengthens between purges

When I'm cruising on level ground, I can do a very quick blip of the Calpod switch and the lean burn drops out for about a second (maybe less, much shorter time than a purge) then comes back on and I can go another couple of miles before it will do a purge. It seems that when the ECU sees the clutch activation it interrupts the cycle.

[Willie Williford]

That's probably because the ecu is getting a signal of "no load" on the engine when the CARD switch is activated. It probably thinks that the throttle is back in the idle mode.

Another way to shorten the purge cycle is to lower the throttle opening to just "slightly open" but not closed, the lean burn action will be reactivated. You don't drop into the idle circuit. It's like Diamond larry says, you cut the purge time in half.

It's real hard to feel with your foot, but I use the vacuum gauge and it is around 19" of vacuum.
21" at idle for my elevation.

Willie

Willie

[rmay635703]

Something I have wondered for years (and still wonder) is why do we need to spoof anything. Every car under the sun made in the last 20 years has some type of tunign solution be it diy or a paid solution. AKA why does the insight have no aftermarket method of altering the ecm eeprom tables? In my mind Honda likely made the ECU/PCM a tad more conservative in a variety of ways,m to support normal driving, many here do not drive normally and can grid charge, this means we could probably alter the cycle time to another value within the ECM and still have the system semi-controlled, same deal with battery output and other factors.