I remember talking about this along time ago. MAF voltage is not linear up to the maximum of 5.0v. You can't use voltage (or percentage like the SAFC shows) to correlate hp because of the non-linear curve and the rpm that the peak occurs at.

Anyway, what I am getting at. Is there any way to guess how much power was gained from a change in MAF percentage? Maybe we just need to get several people to post their maximum MAF voltage or percentage and then actual dyno numbers.

I will dyno the car in a few weeks, just trying to get a rough idea now what power it will make. I think the maximum percentage I ever saw on the 3.0 was around 60% reading straight off the SAFC. I did a quick pull to redline in second gear earlier today, and it read 76% with me shifting at 6800rpm. That number may be higher in 3rd or 4th gear which has more time to rev, or it may be higher with more rpm, I don't know, but at this point it doesn't matter.

What does 16% more MAF percentage mean? I know that doesn't directly correlate into 16% more power. It literally means the engine is taking in 16% more air than the old 3.0 right?

 

What is the actual max voltage you hit? Is the 16% based on voltage? How is the SAFC calculating that %... For example 60% of 5v is only 3v, however that seems low even for your 3.0. I hit into the 4.6's on mine and that's with only 220hp give or take a few. But based on 5v being 100% then 4.6 is 92% so I don't think you can necessarily assume that 16% on the MAF is equal to 16% airflow... it depends on the shape of the MAF curve. Since it's non-linear a given increase in voltage will not necessarily give the same increase in airflow.

Now if we actually knew the MAF curve (ie at a given voltage there is x g/min or whatever) then you could make an estimated guess at power by assuming a certain VE. But it's probably gonna be just easier to post up a MAF voltage vs dyno'd HP number.

 

I'm going to bump this thread and add that voltage itself doesn't seem to correlate to peak %. Seems that's more related to gm/s.(%usage )

Because my V on my A33B MAF maxes out @ 4.46v(89.2%/5v), but only sees 153.06 gm/s, and on the SAFC %, reads 52.xx% when using my 82mm MAF housing.

Whereas when I use the stock MAF housing (same sensor) reads 161 gm/s and 71.xx%.

 

well guys my pocketlogger i believe converts the MAF voltage into lbs/per minute

i actually wrote down some #'s today on my two IM setups. iam still learning the features on datalogging . next time i do it ill use the graph feature. but for this i used a different feature that shows the highs for each throttle stab.

I was learning things as i went and also VS the two IM's setups underhood temps were very different because after i hooked up the other IM setup it got
much colder out with first IM (short ram) setup peak air intake temp was 141 F. with the regular elbow setup it was 102 F peak.

anyways heres some #'s they arent equel rpm but like i said iam learning yet.

SHORT RAM IM
----RPM------- lbs per/min------ timing
idle 825 ----------- .76 ---------5
1552------------ .99--------34
2062-----------1.29 --------35
3025-----------2.23-------- 39
4437-----------4.14---------63
4962-----------4.46---------44
5750-----------5.18---------45
6375-----------7.77---------48
NORMAL elbow (SSIM)
idle 787--------.74-----------5
1662------1.17-----------35
1987------1.43-----------37
2950------2.10-----------43
4250------3.63-----------43
5025------4.46-----------44
5437------5.18-----------45
6162------6.88-----------45
6400------7.66-----------46

this isnt very scientific but decided to share this after seeing this thread

 

Damnit... Now to convert lb/min --> gm/s...

 

I think EU only logs maf V, I will have to double check... I too max out at 4.46v

 

Ok from what i can see I dyno about 200whp when I was NA and my mAf would be right around 4.3 V when recorded by my eu. I did not dyno yet boosted but I have recorded maf now of 5.04 V after about 5800 rpms.