When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Ya it was supper close on the gauge AEM I will change the math in mine.
According to my math, it then is always reading in the 11's and 12's.... Very rich numbers. If you plot is vs commanded, that gives you the VE correction.
If you could do a quick video of the gauge, I might be able to get the offset closer. Maybe try and get the laptop and the gauge in the same shot so I can see both at the same time. I recognize that math, and it is pretty common out there to start with those numbers, but in reality, the numbers vary between different sensors and brands.
Scanner watched the gauge and it matched the wide band. I used the RTT to raise the ve table to get the wb to match the afr commanded. I think the ve table needs alot of work. should i do it cell by cell?
At the end of my video I show how to do this. Just copy the corrections, and use the "paste special" function in the tune, then hit multiply by %. It will do the work for you. Also, change your MAP to kPa instead of psi by just clicking the units in the log. Makes it easier to stay on one unit or another. For VE kPa is what is always used, not psi, though they are both the same thing, just different units.
I still think it's the wrong sensor, that or your offsets in the tune are wrong... Even if they were wrong it should still at least go above 105. That's why I think the sensor is a 1 bar.
I should also note, only use numbers when at operating temp. In fact, I just warm the car up before I even start the log, unless I'm tuning idle and want to know what it's doing for cold starts, etc.
Try setting your MAP offsets to 10.33/305 and see if that gets it working. Might not be correct, but it will at least narrow down the problem.
Also, if you can give me the part number and brand I can calculate your MAP offset using the correct data, if I can find the P1 and P2 values and voltages that is. Bosch has this info available on their site. That's one of the OEM brands, like AC Delco.
I went back into the pid charts i had the map pid at sae sensor. changed to 3bar sensor . the difference on the chart vs time chart was way off. I will order the sensor i dont have any data was in the car when i got it. its the gen4 ls1 intake so i will have to remove the intake to get to it.
Short of pulling intake is there any other way with a meter or scan tool to see if the map will go above 105kpa. my BOV is opening when i get in the upper rpm range. Question could the bov be opening to soon and discharging the intake pressure before 105 plus kpa is reached?
Just took the shitbox for a ride will not go above 105kp. Question if its a 1 bar or bad map will it not fuel past 105 will it?
No it will not, which is why I said it's very important to fix. I am not aware of any other way to check the pressure in the intake, unless you have a vacuum gauge. The scanner is one of the best tools you have for this. Vacuum gauge will tell you in inches, which is yet another unit lol. 105 kpa is approximately 29.92 inches/mercury, at sea level. I know that number because of my other job, which deals with aircraft and flying. That's the baseline for an altimeter to put it at sea level, to do engine checks or what we call a HIT check. It's almost never that though in reality, and tower will tell us the setting when we ask them.
But yeah, vacuum gauges often read in in/merc, but on the negative side of it.
The MAP sensor is basically a little barometer, measures atmospheric pressures, some actually read current, ours only read what they are set to read in the tune. As in you will always see the same numbers at a particular voltage. Key off this number is usually like 100-105 kpa or so.
105 kpa is 1 atmosphere, otherwise known as 1 bar, or approx 14.7 psi, or 29.92 in/merc. Boost is called boost because no N/A engine can exceed this. There is simply not enough air present to do so, naturally. However with an air compressor like a turbo or supercharger, it becomes possible to push beyond the pressure naturally present at any given altitude. That's why it's called "boost".
Is there a part number on your sensor? You can also install it elsewhere on the intake you know. The 2 typical locations are in the rear by the brake booster line, and in the front by the throttle body.
Your BOV may be the culprit, as in your last log I am seeing a MAP value of 128 kpa, well into boost. I am also seeing that your spark is a bit on the high side because your scaling is causing the calculations to hover around the top of the table, in the high spark regions. You can fix this by adding increasing your injector flow rate numbers to something like 55 or so, or about 20%. That will move your spark down the table by 20%. That would help as well, because you certainly don't want those high numbers during acceleration into boost. 20+* is what I am seeing before you hit the lower numbers on the table.
Had to edit the numbers... It's early. Set flow rate to 55.
Last edited by ChopperDoc; 04-15-2019 at 11:49 PM.
04-14-2019, 11:29 PM
