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Old 03-31-2015, 11:26 PM   #101 (permalink)
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Quote:
Originally Posted by ever_green View Post
Yeah the new stratified charge lean burn Hondas might help, but the new Prius can get pretty good mileage on highway without lean burn. Therefore I personally don't see the point.
Well, lean burn is better than cooled EGR like I mentioned for attaining complete combustion. Of course, the biggest problem is getting rid of the NOx, and the current NOx traps are not a good solution.

Since you've experimented with this, do you mind sharing your fueling tables? I'm thinking about getting a BRZ and I'm super excited to fiddle with the ECU (that is, lean burn!). Just to get an idea of how lean you can go at what speed.

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Old 04-01-2015, 03:46 PM   #102 (permalink)
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Originally Posted by serialk11r View Post
Well, lean burn is better than cooled EGR like I mentioned for attaining complete combustion. Of course, the biggest problem is getting rid of the NOx, and the current NOx traps are not a good solution.

Since you've experimented with this, do you mind sharing your fueling tables? I'm thinking about getting a BRZ and I'm super excited to fiddle with the ECU (that is, lean burn!). Just to get an idea of how lean you can go at what speed.
Standard Subaru ecu does not allow you to go leaner than 14.68 Afr or lambda 1.0 in closed loop. What you have to do is induce a fulltime open loop behavior and then have the Maf sensor underestimate airflow by reduce Maf scaling. This is a lot of work as it requires you to reduce the engine load scale across the board in ecu or else it will think there is less cylinder pressure than actually is and run too much timing (this is just one example). Also on the BRZ I highly doubt this is feasible. The direct injection and firing angle tables are extremely confusing and I wouldn't dare tinker with it.
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Old 04-01-2017, 03:37 PM   #103 (permalink)
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I owned a Honda VX for a while (traded it in because it did not have an AC) and the damn thing worked as advertised. We got 55 mpg routinely and sometimes more. Car drove and ran like a sports car if you got on it.

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