larger MAF housing will offset some of that to a point, which is what may have occurred with that new intake. Still, the scaling needs to be adjusted for the MAF, I bet a few WOT runs in the upper gears will show you those codes again
What have you done to your 200 Series this week? (24 Viewers)
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larger MAF housing will offset some of that to a point, which is what may have occurred with that new intake. Still, the scaling needs to be adjusted for the MAF, I bet a few WOT runs in the upper gears will show you those codes again
I have a feeling you could be right, the top end run could bring this issue back. Previously i would get P0101 even in partial throttle. I already bump up the MAF scale by 5% along with the aFe. This self tuning and learning at the same time is very time consuming, I'm glad and bless to be retired. I'm sure my insurance tracking app is wondering why i keep blowing twice speed limits near my house.
Julian73
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Must be a more restrictive filter. Only reduced airflow would stop an MAF from previously maxing out.
Julian73
SILVER Star
Since i switch to bigger DW 650 injectors i'm less worried of the lean conditions unlike before where I have stock injectors for stage 1. My goal is NOT to get the most horse power, but to get enough for my need. At this point the power are already there, i just want to make run smooth (which it is) and vitals are running at a safe limits on road or street use conditions. The challenge is learning the control logics of the Toyota ECU and their hierarchy and how it take place. My closest experience I have is tuning carbureted dirtbike motorcycles and my previous life of doing RF Design Engineer, i did a lot of radio frequency (RF) tuning simulation and design experiments. The challenge is how much gas i'm going to burn doing drive test by the time i'm satisfied, he he fun and satisfying?
All i want is to share my experience (just another data points), i do not claim its the one, there so much variables (AKA rabbit hole). Another performance data, With 34 in tires and stock gearing the truck can sustain 1K RPM at 45 to 50 MPH at a flat road.
Julian73
SILVER Star
Its not the case of capacity of MAF, air input or injector size but how air is measured. The MAF measures a unit of airflow velocity while ECU is looking for a value of air input Q. the Mass Volume of air input which is a function of the average velocity of slug of air, the cross section area of the slug of air, and the temperature of the air to calculate density to get the mass. The MAF samples the velocity and temperature of a piece of this cross section. But this is not the average velocity of the whole cross-section; the only way to get the average is through extensive testing of the flow and dynoing by the manufacturer. and building a correction table within the ECU. ie at velocity 100 actual average flow may be say 95, while at 150 actual may be say 138. (the point being that is not 1 for 1 and may not even be linear with change in flow rate.). Now changing the path of airflow into the MAF can most likely change this relationship, now the new MAF reading will either result in more or less volume of air that the computer things is incoming. If the flow has gotten more efficient a MAF reading of 100 may now mean actual average airflow is say 102... the ECU still thinks its 95 ... and sets fuel rate for such; however, actual air flow is 7% higher ... and thus mixture is 7% leaner ... oops.. The only solution is building a new table in the tuning is accessible, or adjusting fuel trims ... this requires actual dyne time is active wideband O2 sensing. My Lotus spent 12 hours of running dyne time to build a new intake box and combination of MAF tube diameter trials and flow straighter tests to get a produce that while the flow could go higher that the stock intake, the end result was that for a given measured flow reading its still matched the average cross section flow.
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Thanks for the additional information's. Would you happen to know the Torque Load Table, reason I'm asking on more newer model i think 2012 newer it has up to 140% table, my 2008 only have 110%. I read on another thread supercharge engine will need up to 140% Torque table. Will this be a limiting factor for my 2008?
Julian73
SILVER Star
Your lotus doesn’t run a MAP too?
Did you put in a tune? If not, then the larger fuel injectors are doing nothing, as the ECU doesn't realize they're there and is still sending the same fuel signals to what it thinks are stock fuel injectors.
Yes I have my own tune, that was point all along. I've have been using HP tuner and slowly revising the ECU software to accommodate all the new DW 650 injector specifications, MAF table and the Harrop Supercharger to compliment each other. This process of tuning is laborious in away due to the amount of drive test and learning the software tool at the same time. First tuner i hired locally was able to get away by doing nothing on the tune. Well they installed the injectors and pulley and charge me $1200 and kept the car for 5 days. They automatically assumed the owners dumb and don't know how to read the ECU file and compare before and after. This is my motivation, not again and everyone beware. A good information to know on a 2008 Land Cruiser on a stock form you can drop a DW 650 injectors and 80mm pulley on a Harrop supercharger in stage 2 requirement the truck will run just fine until you put a load. I drove the truck for a week in that configuration and did not get any check engine. Until i gave it 60-70 throttle and the entire dash lit up with all kinds of warning error.
Julian73
SILVER Star
Yes it does, one needs average density, average velocity and cross-sectional area to determine flow mass; however discrete point sensors don't measure averages.
Understand, i run a purely map based tune on my e46 m3, there are trade-offs certainly
Julian73
SILVER Star
Ordered a Road Chef Travel Oven to hang from the Kaon rack
Curious how this works.
Could you please share why you removed the Gamiviti rack and back to the factory rack. Several folks here are going back to factory rack. I am planning to get a Gamiviti and curious. thanks in advance.
Yeah, no worries. My planning assumption for the rack was that the family would be tent camping, so we would need the rack to strap everything down. Suddenly, the wife decided that a camper was the way to go, so the roof rack became weight without purpose, and I had access to a factory rack locally.
Added a Gamiviti dash mount. Now I need to sort out what all I need from Ram mounts to get a phone and ipad up there.
I found a stowaway while performing regular maintenance, we picked this guy up on a recent trip into Wyoming. I know this for a fact because I was able to kill his buddy when airing down after leaving camp one morning, a couple hours later we came face to face through the windshield with his other buddy. I was able to grab him by hand and evict it.
This guy was on the skid plate when I pulled it to access the oil filter. 3 mice from one campsite we stayed at for 2 nights.
This guy was on the skid plate when I pulled it to access the oil filter. 3 mice from one campsite we stayed at for 2 nights.
