2byte airflow limit?
#18
Account Disabled
iTrader: (38)
Join Date: Aug 2005
Location: Virginia Beach, Virginia
Posts: 9,319
Likes: 0
Received 1 Like
on
1 Post
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)
#20
Evolving Member
iTrader: (10)
Join Date: Aug 2005
Location: San Francisco, CA
Posts: 246
Likes: 0
Received 0 Likes
on
0 Posts
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).
![](http://home.comcast.net/~y2kevse/images/evolution/MAF_reinforcement/9_s.jpg)
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
![](http://home.comcast.net/~y2kevse/images/evolution/MAF_reinforcement/9_s.jpg)
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
![](https://www.evolutionm.net/forums/attachments/ecu-flash/127022d1229731147-2byte-airflow-limit-load_difference.gif)
Last edited by KevOVIII; Dec 19, 2008 at 10:21 PM. Reason: Took out green as that part was for the MAF screen/honeycomb cover
#22
1450's i'd have to look at my laptop, KevOVIII might have it more handy.
#23
EvoM Guru
iTrader: (6)
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).
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).
#25
Evolving Member
iTrader: (10)
Join Date: Aug 2005
Location: San Francisco, CA
Posts: 246
Likes: 0
Received 0 Likes
on
0 Posts
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).
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).
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.
#26
Account Disabled
iTrader: (38)
Join Date: Aug 2005
Location: Virginia Beach, Virginia
Posts: 9,319
Likes: 0
Received 1 Like
on
1 Post
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.
#27
Account Disabled
iTrader: (38)
Join Date: Aug 2005
Location: Virginia Beach, Virginia
Posts: 9,319
Likes: 0
Received 1 Like
on
1 Post
![lol](https://www.evolutionm.net/forums/images/smilies/lol.gif)
#28
Evolving Member
iTrader: (10)
Join Date: Aug 2005
Location: San Francisco, CA
Posts: 246
Likes: 0
Received 0 Likes
on
0 Posts
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.
![Frown](https://www.evolutionm.net/forums/images/smilies/frown.gif)
Power actually increased from 409/315 to 415/317 on those logs you see.
#29
Account Disabled
iTrader: (38)
Join Date: Aug 2005
Location: Virginia Beach, Virginia
Posts: 9,319
Likes: 0
Received 1 Like
on
1 Post
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.
![lol](https://www.evolutionm.net/forums/images/smilies/lol.gif)