He epoxyed the honeycomb. Which actually brought the 2byte load down about 40-50points which gave everything a little more headroom. I'm sure we would have maxed out the 2byte with E85 without that little "mod".

 

Yeah, were were surprised load actually dropped with the MAF epoxy mod. Mellon's load increased instead.

Here's another screen shot with more info.

 

why would it decrease? that doesn't make any sense...I did mine wrong in hind sight...I put the epoxy around the outer edge on the outside which obstructed some of the honeycomb. I suspect that also forced more air through the center section that's metering the airflow and thus the load increased dramatically. I was pegging 380kpa when I shifted to each gear and it didn't come off of that until ~ 8000rpm +. I should have pulled it out and put a bead around the outside so that blockage wouldn't happen. I've since pulled the honeycomb out altogether...I anticipate going up on the boost with race gas (only run 93 thus far) and I don't want to take any chances. Currently I'm seeing ~ 370ishkpa IIRC (car isn't here right now)

 

It doesn't make any sense but it happened. I'll take the free headroom.

 

Not sure why it decreased, and yes it doesn't make sense. I epoxied all the edges that touched the MAF screen (purple, yellow, red, and lines in picture).





Here's a screen shot of the "before" and "after" MAF epoxy.
Left side = before epoxy, 91 octane
Right side = after epoxy, 91 octane (getting ready for 50/50 meth in the same dyno session)
No changes to boost, timing, or mods

 

I'm curious as to two things:

- How the JDM MAP sensor (a 3-bar absolute item) able to register 33+psi.

- The injector scaling used for the FIC 1450s.

 

34 is about max depending on atmospheric for the JDM map sensor. (yes I know it doesn't make sense math wise but i've seen many flatline around there at sea level) So basically it's at the end of it's resolution.

1450's i'd have to look at my laptop, KevOVIII might have it more handy.

 

Standardizing a 4-bar sensor (what I and a few others need) would cover the bases for everyone. If one exists that fits physically and is a 0-5v sensor, we should look at that.

A base scaling for the 1450s from 1-2 persons would be helpful, as I need to go to that from 1250s (I'm at the end).

 

mellon,

did you see any adverse affects with removing the honeycomb altogether?

 

A agree with what you said about a higher bar sensor. Does Mitsubishi make a 4 or 5-bar?

I had to bring scaling all the way up to 1624 on 91 octane for the trims to be happy (low = 1.4 and mid = -2.4), and way down to 1008 on E85 (low = -0.2 and mid = 2.2). Stock FPR.

 

wow Kev, that's no little drop either. I really think something else is going on...injector scale change perhaps without accounting for it in the evoscan calculation maybe? then again that's probably 2byteload...hrmmm. If the airflow truly decreased that much the power would have dropped accordingly. I assume it was dyno'd after the change to get the power back where it was.

 

nope, I've been running without a honeycomb in my 700awhp TT Stealth for 12 years so I knew it would be fine on the EVO as well. Sometimes you have to ignore the gospel on EVOm and just do it.

 

Yeah, it's weird. lol Yes, it's 2 byte load. 2 byte airflow wasn't logged on the 91 tunes.

Power actually increased from 409/315 to 415/317 on those logs you see.

 

nice mod list in the sig btw just noticed that... I just got my new tranny installed, maybe I'll get some airflow logs at 32psi on the HTA86 (~600whp DLL) for us this weekend.

 

good enough for me lol