Catalyst location on lean burn Honda cars

[SVOboy]

I still don't fancy it being worth enough of a fuel economy gain to be worth the effort. The new R series engines run WOT and they're not impressing anyone

[theunchosen]

The Honda R series? Like 2006 civic?

Those are still throttled. Its just controlled by a servo instead of by a cable.

Actually people usually do make a pretty big deal when one of the manufacturers does say they are going to make something throttle less(as in no throttle body not as in no way to step down the fuel delivery, as it could be taken either way). Throttleless engines can come close to matching DI(diesel) FE. The reason they don't happen is emissions.

I can make my 93 more emissions friendly than it is with lean burning and a little water, but manufacturers can't get inside ULEV and do it without costs. Also no manufacturer would be able to sell a consumer car that requires a water tank to be filled on a regular basis. How could you market a car that had "extra maintenance." It would be like having to market a car that less HP. Those issues are irrelevant to hypermilers since we go to great lengths for little drops of gas.

[zhillz]

So what exactly makes the car go into lean burn mode? Can a tuner get into your ecu and permanently turn it on or change the times it does? I know they can alter vtec engagement and even boost by gears so why not this?

PS: if you have a d16z6 you dont have a lsvtec motor.........

[RobertSmalls]

I won't answer your question until you explain your avatar, Drunk.

[zhillz]

I couldn't think of anything clever and I was drunk when I set it up so wha-la.

[RobertSmalls]

Ah.





The ECU decides when it's time for lean burn mode. My engine can only do it under very light loads, and it won't do it until it thinks the catalyst is hot. But if conditions are right, it will automatically go in to lean burn, and stay there until I ask for more power than it can provide while lean burning.

Unless you have a Civic VX, HX, 02-05 Civic Hybrid, or MT Insight, you don't have a lean burn Honda. AFAIK, the folks on this forum who have converted their cars to lean burn have installed an engine and ECU from one of those cars. Lean burn models use different heads, pistons, ECUs, and emissions systems.