MIVEC gas mileage tuning
#1
MIVEC gas mileage tuning
I experimented a bit last night by zeroing out MIVEC alternating load columns in the cruise cells and couldn't detect a difference in drivability. I searched on EvoM and found some discussion but no obvious indication that anyone has really tried to figure it out. Wondering if anyone else has experimented with MIVEC in the cruise cells, especially for those running non-stock cams.
I'd have posted in the MIVEC tuning thread, but its rather huge now and not so easy to follow.
I'd have posted in the MIVEC tuning thread, but its rather huge now and not so easy to follow.
Last edited by mrfred; Feb 24, 2013 at 09:31 AM.
#3
Evolved Member
iTrader: (8)
I would love to experiment with this with yall but unfortunately my car is in pieces. I drive 24 highway miles each day to and from work. But with my tune i get about 12mpg. When i get it all back together this spring i'll join in or use your data to play with mine.
I will be running piper race cams and the ef4 turbo 9.5/1 compression and e85 when its done. None of which scream fuel economy
I will be running piper race cams and the ef4 turbo 9.5/1 compression and e85 when its done. None of which scream fuel economy
#5
Interesting comment on EGR. It prompted me to do a bit of reading on EGR vs mileage. EGR seems to make a lot of sense for improving mileage and decreasing combustion temps. Almost makes me wish I had not blocked off my EGR passage. Maybe I'll unblock it next time I have the exhaust manifold off. Anyhow, I've got a pressure sensor hooked up to my exhaust manifold, so once I get the car back on the road, I plan to log EM pressure during cruise to see what's happening. This may provide some insight on when it would be possible to cause reversion-induced EGR.
#6
EvoM Guru
iTrader: (1)
Mrfred what sensor are you using? I have the jdm mani with m14 plugs for sas.. Also can stft be a good indicator if you make an adjustment then flash and log immediately?
use the baro adc if you're on sd. Or do you use a dlp?
I know my exhaust ports draw a vacuum at idle and I'm not particularly sure where they start seeing pressure
use the baro adc if you're on sd. Or do you use a dlp?
I know my exhaust ports draw a vacuum at idle and I'm not particularly sure where they start seeing pressure
Last edited by 211Ratsbud; Feb 28, 2013 at 04:40 AM.
#7
Evolved Member
iTrader: (30)
We did some EGR testing in an already fuel efficient motor and saw zero gains. The best results for the Evo were to run on the lean side (15.5-16.0, no leaner), run 44-46* of timing, and I ran the MIVEC full advance in cruise to mimic the K series. I was getting 24mpg on gasoline driving on I5 north for 152 miles (hilly terrain) at 75mph with the IX 5 speed. That was my 2.4 and R2 with Magnus for reference.
Trending Topics
#8
Mrfred what sensor are you using? I have the jdm mani with m14 plugs for sas.. Also can stft be a good indicator if you make an adjustment then flash and log immediately?
use the baro adc if you're on sd. Or do you use a dlp?
I know my exhaust ports draw a vacuum at idle and I'm not particularly sure where they start seeing pressure
use the baro adc if you're on sd. Or do you use a dlp?
I know my exhaust ports draw a vacuum at idle and I'm not particularly sure where they start seeing pressure
We did some EGR testing in an already fuel efficient motor and saw zero gains. The best results for the Evo were to run on the lean side (15.5-16.0, no leaner), run 44-46* of timing, and I ran the MIVEC full advance in cruise to mimic the K series. I was getting 24mpg on gasoline driving on I5 north for 152 miles (hilly terrain) at 75mph with the IX 5 speed. That was my 2.4 and R2 with Magnus for reference.
#15
Former Sponsor
iTrader: (12)
I have wanted to tinker with the idea of a larger EGR port just to see if any economy gains can even be had. Not much larger, maybe a 20% larger orifice. The factory EGR hole is maybe 3/16" at most.
This would only be using the inert EGR gases as a volumetric filler and not for any emissions purposes at all.
-Jamie
This would only be using the inert EGR gases as a volumetric filler and not for any emissions purposes at all.
-Jamie