AdamRRT
September 27th, 2011, 06:19 AM
Just thinking that we can kick around ideas on how to save MPG with our tuning. Just toss out ideas to discuss. I've got a few:
- slightly reduce duration throughout the daily driven power range. At least for me, since with my slightly bigger tips a stock tune slightly hazes upon acceleration.
- reduce boost-dependent fuel enrichment at cruising RPMs.
- reduce pilot duration throughout - I'm thinking I'll do my pilot at 50% from idle to 900rpm, and reduce it to 25% from 900rpm to 1200rpm, 10% from 1200-1500rpm, then gone. Just a thought so that it'll still idle quietly and not sound like a piece of crap at parking lot speeds, phasing it out by 1700rpm.
- raise rail pressure slightly - like 10-20% - at lower RPM where it truly might be hindering atomization, but leave it alone at cruising RPM. I have experimented and found that FOR ME, the theoretical increased MPG from increased RP leading to better atomization is nothing more than a sales pitch. I think there's a point of diminishing returns with rail pressure, and IMHO the benefit of atomization seems to barely increase the higher we go. If it were better, we'd be running more pressure from the factory. Just my thoughts and EXPERIENCE. It's not worth the increased injector wear.
What other ideas do you guys have to try to reduce mpg?
Do you think that a less touchy throttle would help, so that you never command more fuel than intended? I think so, but others may disagree. My thought is it'll reduce the times and amounts by which you accidentally give it more pedal than needed.
- slightly reduce duration throughout the daily driven power range. At least for me, since with my slightly bigger tips a stock tune slightly hazes upon acceleration.
- reduce boost-dependent fuel enrichment at cruising RPMs.
- reduce pilot duration throughout - I'm thinking I'll do my pilot at 50% from idle to 900rpm, and reduce it to 25% from 900rpm to 1200rpm, 10% from 1200-1500rpm, then gone. Just a thought so that it'll still idle quietly and not sound like a piece of crap at parking lot speeds, phasing it out by 1700rpm.
- raise rail pressure slightly - like 10-20% - at lower RPM where it truly might be hindering atomization, but leave it alone at cruising RPM. I have experimented and found that FOR ME, the theoretical increased MPG from increased RP leading to better atomization is nothing more than a sales pitch. I think there's a point of diminishing returns with rail pressure, and IMHO the benefit of atomization seems to barely increase the higher we go. If it were better, we'd be running more pressure from the factory. Just my thoughts and EXPERIENCE. It's not worth the increased injector wear.
What other ideas do you guys have to try to reduce mpg?
Do you think that a less touchy throttle would help, so that you never command more fuel than intended? I think so, but others may disagree. My thought is it'll reduce the times and amounts by which you accidentally give it more pedal than needed.