Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Nerdy engineering/theory discussion on EGR/lean burn

HeadlesNorseman · 04-24-2015, 01:27 PM

I guess i am in kind of a unique position. Ive always been a honda guy, more so as daily beater cars and transportation than hot rodding. But i do have a good deal of tuning knowledge and experience, have some good friends in the "power" industry with dyno access and what not. BUT...with OBD1 hondas (92-95 civic specifically) that i know many of you have, you basically have full control over the ECU programming with the right parts. so my main questions here...

1. EGR. i know its an emissions device, but has anyone thought of implenting it ON 100% of the time during cruise with proper fuel and timing adjustment? this would have a similar effect to displacement on demand type of technologies correct me if im wrong. I just recently started messing with my vtec-e d15z1 and cleaned the egr system all out and got it back to working order. the motor isnt installed in a car yet, but this would be nice to mess with even on a non-vtec civic or crx

2. cam timing vs ignition timing. im sure this would take some BMEP charts and some dyno time, but since we can tune these things to small rpm range (say 1800-2200 rpm highway cruising with crx HF gearing) it would be nice to discuss.

3. compression, intake manifold volume, etc. Also thinking of modifying these for optimal effeciency around the highway rpm. i know from an engineering perspective getting an engine to run very well at a narrow rpm is easier than making it more driveable across a broad rpm, so there may be some tricks to be had here

This is also simply from a DIY tuning/hacking/make the best of what you have idea.

04-24-2015, 01:27 PM	#1 (permalink)
HeadlesNorseman Honda Head Join Date: Feb 2014 Location: nj Posts: 20 Rescue Toaster - '90 Honda Civic 90 day: 40.92 mpg (US) Thanks: 2 Thanked 5 Times in 4 Posts	Nerdy engineering/theory discussion on EGR/lean burn I guess i am in kind of a unique position. Ive always been a honda guy, more so as daily beater cars and transportation than hot rodding. But i do have a good deal of tuning knowledge and experience, have some good friends in the "power" industry with dyno access and what not. BUT...with OBD1 hondas (92-95 civic specifically) that i know many of you have, you basically have full control over the ECU programming with the right parts. so my main questions here... 1. EGR. i know its an emissions device, but has anyone thought of implenting it ON 100% of the time during cruise with proper fuel and timing adjustment? this would have a similar effect to displacement on demand type of technologies correct me if im wrong. I just recently started messing with my vtec-e d15z1 and cleaned the egr system all out and got it back to working order. the motor isnt installed in a car yet, but this would be nice to mess with even on a non-vtec civic or crx 2. cam timing vs ignition timing. im sure this would take some BMEP charts and some dyno time, but since we can tune these things to small rpm range (say 1800-2200 rpm highway cruising with crx HF gearing) it would be nice to discuss. 3. compression, intake manifold volume, etc. Also thinking of modifying these for optimal effeciency around the highway rpm. i know from an engineering perspective getting an engine to run very well at a narrow rpm is easier than making it more driveable across a broad rpm, so there may be some tricks to be had here This is also simply from a DIY tuning/hacking/make the best of what you have idea.