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.
Mine is around the 0.96 level in upper rpms so no big difference there .
That just leaves maf calibration . Looking at the loads you are seeing at similar boost levels they seem quite a bit higher than mine. I like to calibrate for around 200% load at 14-15psi .
Something I haven't mentiond is that I like to do a 0psi log to simulate NA operation . If scaling is wrong on the injectors you wont get the numbers to line up with actual and you will get a big spike at around 5500rpm when the p2s kick in . also loads should be with a few % of 100 when doing this. Quite a difficult log to do without fully opening the WG though.
Mine is around the 0.96 level in upper rpms so no big difference there .
That just leaves maf calibration . Looking at the loads you are seeing at similar boost levels they seem quite a bit higher than mine. I like to calibrate for around 200% load at 14-15psi .
Something I haven't mentiond is that I like to do a 0psi log to simulate NA operation . If scaling is wrong on the injectors you wont get the numbers to line up with actual and you will get a big spike at around 5500rpm when the p2s kick in . also loads should be with a few % of 100 when doing this. Quite a difficult log to do without fully opening the WG though.
My latest logs where I am seeing 240-250% load are at 16psi. Attached are my MAF calibration and last log. What does your MAF calibration look like? What kind of MAF voltage are you seeing? My last log was 4.88V. MAF voltage is is likely a better apples to apples comparison for where we are at relative to each other. From there we can suss out differences in calibrations.
My latest logs where I am seeing 240-250% load are at 16psi. Attached are my MAF calibration and last log. What does your MAF calibration look like? What kind of MAF voltage are you seeing? My last log was 4.88V. MAF voltage is is likely a better apples to apples comparison for where we are at relative to each other. From there we can suss out differences in calibrations.
I have the voltage reduction mod. so comparing voltages won't be relevant . At 16psi my loads are 210-215% and peak maf is 435g/s (just under 4.9v fwiw)
Ha, we are thinking along the same lines lol... I would suggest we compare MAF voltage so as not to get hung up on MAF calibration at this point but since you have the MAF voltage divider mod and we can't really compare apples to apples this might be tough...
I'm not sure where we are going with this ..... lol . My original point is that the P2 injector staging in the oem maps causes large P2s to be out of whack flow wise . Your tune works obviously so I guess it doesn't matter so long as you get the end result you desire
Well, I was hoping to better understand load vs airflow for the Renesis The challenge is that there are so many variables that we all adjust for our own setups. None necessarily right or wrong, just what works, as you mentioned. I am thinking that somewhere in the mix there is usable data to help us refine our tuning, both logical ECU parameters and physical setups... That was my thought anyway
If this is documented elsewhere I don't mean to rehash unnecessarily. By all means please let me know if there is some place I can look and we can nuke this thread from orbit lol... Ultimately, just trying to prep for next level!
I spent a lot of time massaging numbers in matchbot . Give it a try as the process of trying to get the numbers to make sense will help you understand what you have to do to make more powerzzzzzzzzzz !
Hmm, ok, I thought that was more about matching turbo/compressor to engine, not about airflow vs load calculation specific to our Renesis. But I will go spend some time on it.
Hmm, ok, I thought that was more about matching turbo/compressor to engine, not about airflow vs load calculation specific to our Renesis. But I will go spend some time on it.
I found it very enlightening . You will have to make a guess at where your turbine sits ..... once you get backpressure info that becomes much easier and it all seems to come together .
I now have power/backpressure/boost/maf flow all lining up with what i'm seeing in my logs .
Cool! Unfortunately, it will be a bit before I get physically prepped to perform all this. In the meantime I will do some studying. But, curious for the spoiler, will this answer why for the same airflow at a given RPM we will get different loads?
will this answer why for the same airflow at a given RPM we will get different loads?
we don't ..... if you look at 8100 rpm where our (logged) flows are almost the same .... load is almost the same . Small discrepancy would be due to the different ambient temps.
Ok, so after looking at logs direct I see we are pretty much in synch. Looks like I was making much ado about nothin' regarding airflow vs load lol.....
That said, I still think there might be some value in seeing where our MAF voltage lines up. But given that you are running a voltage divider and I am not, and the variance in MAF response that I have seen, I think this may require more effort than it is worth....
If you recalibrate yours to look more like mine .............. it will make you run lean . To correct that you will need to rescale the P2s , which is what I was alluding to at the beginning of this discussion
If you look at the stock MAF calibration profile it does a funny taper off at the end. I was attempting to preserve that as I figured Mazda had something figured out... Agreed, the differences in our MAF calibrations would certainly explain all the other differences in our logs, which is why I was hoping to see our MAF voltage comparisons and more or less eliminate calibration uncertainties from the equation...
02-21-2016, 01:22 PM
) So you are seeing higher g/s but I am seeing higher loads... Hmmm.....
