DIYPNP install: inital tuning
#381
I swear the new cams have had a huge difference in the idle characteristics of the car! The increased air has allowed me to turn down the PID settings a LOT! I cannot even feel it when the AC compressor engages anymore, and turning on AC plus headlights is just a small smooth dip which normalizes immediately. With some more tuning, I may even be able to get rid of the extra solenoids.
RPMdot is more erratic now due to the cams, which is mainly the reason I cannot run extreme D anymore.
Logs here:
https://www.miataturbo.net/showpost....0&postcount=29
RPMdot is more erratic now due to the cams, which is mainly the reason I cannot run extreme D anymore.
Logs here:
https://www.miataturbo.net/showpost....0&postcount=29
#383
Maruha NA6 f-cams. They are mild cams, meant to be compatible with the stock ECU and valvetrain. 252 in/256ex, 8.5mm lift. I installed them for a better midrange, and was pleasantly surprised by the effect they had on idle (well after an initial shock at a horrible idle, due to wrong timing sync).
#388
I swear the new cams have had a huge difference in the idle characteristics of the car! The increased air has allowed me to turn down the PID settings a LOT! I cannot even feel it when the AC compressor engages anymore, and turning on AC plus headlights is just a small smooth dip which normalizes immediately.
#389
Sure. My point was more that any overlap increase is generally robbing power elsewhere in an FI system. Normally you'd add cams that reduce overlap, not add it (which is opposite of what you'd do for a NA engine). Under boost, that overlap is allowing air to escape out the exhaust.
Lift is a good thing either way.
G
Lift is a good thing either way.
G
#391
I'd be keen to know as I'm working towards a turbo but will go Cams first and intend on getting 10mm lift with aggressive overlap, but will use Adj cam wheels to dial that out (and more) once the turbo becomes a reality.
G
#392
Rassa frassa ^$^&$
Discovered why my idle droop was gone-- the AC fan relay trigger was grounded and in turn triggered the compressor! So that's why my base MAP was so high, ~50. The rewiring was done at the same time as the cams (I never learn do I).
Aaaanyway, fixed the electrical issue- base idle MAP went down to ~40. And surprise surprise, AC engagement causes some droop again! Not as bad as before the cams, but I will have to ratchet up the D value. Right now it's a tradeoff between killing the dip completely and having a twitchy idle, or allowing some dip and have a more sedate idle. Trying to find that balance now...back to PID tuning! >.<
P60 I80 D600 min 900 max 1650 idle duty range: 25-80
Discovered why my idle droop was gone-- the AC fan relay trigger was grounded and in turn triggered the compressor! So that's why my base MAP was so high, ~50. The rewiring was done at the same time as the cams (I never learn do I).
Aaaanyway, fixed the electrical issue- base idle MAP went down to ~40. And surprise surprise, AC engagement causes some droop again! Not as bad as before the cams, but I will have to ratchet up the D value. Right now it's a tradeoff between killing the dip completely and having a twitchy idle, or allowing some dip and have a more sedate idle. Trying to find that balance now...back to PID tuning! >.<
P60 I80 D600 min 900 max 1650 idle duty range: 25-80
Last edited by Greg G; 10-08-2011 at 02:01 AM.
#393
Why not try my idle up code and perhaps this might be the solution to solve your idle tuning nightmares ;-)
http://www.msextra.com/forums/viewto...299164#p299164
http://www.msextra.com/forums/viewto...299164#p299164
#394
Hey yeah I saw. Will give it a shot when I get some car time. Will require some rewiring to move control of the AC to an output controlled relay, but I can try it to see if the hardware triggered idle increase works! When I get some car time..this coming week is gonna be brutal for me... :P
#396
Oh my this brings tears to my eyes...
Hope it works
How exactly is this calculated? It adds the percentage adder to the final calculated duty? Trying to figure out how this will affect the PID code when active...does this also affect the dashpot adder?
Hope it works
How exactly is this calculated? It adds the percentage adder to the final calculated duty? Trying to figure out how this will affect the PID code when active...does this also affect the dashpot adder?
Last edited by Greg G; 10-09-2011 at 06:07 AM.
#397
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Why not try my idle up code and perhaps this might be the solution to solve your idle tuning nightmares ;-)
http://www.msextra.com/forums/viewto...299164#p299164
http://www.msextra.com/forums/viewto...299164#p299164
I've filed you under the legend pile with Joe Perez and Reverant now