Jefferson.C
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Posts posted by Jefferson.C
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Tried 4 and 6 INJ events with little change to that lean spike. It did seem to lengthen the accel enrichment time while street driving and and part throttle by just observation on my wideband but overall didn't make much of a difference.
Time to try adjusting the Accel Sense value?
Or I could just be chasing my tail due to the intake manifold already being charged with boost pressure the sudden 0-100% TPS change between shifts are going to yield a little lean spike. -
The main modelled fuel table is TPS based. 4D Map is something I will look into.
Adam, why does the GTR base map use 4 INJ events as a hold? -
I am getting a quick lean spike between high rpm shifts and would like to see if I can target this area. The engine is an RB25 with adapted RB26 ITB throttle setup. It has not caused any drive ability issues but I tend to get an exhaust fireball I would like to try and eliminate.
What area in the Accel Enrichment should I address?
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Enter your base fuel pressure (actual running fuel rail pressure) and minimum effective pulse width in the Fuel Main screen. Next, Injector flow @ specified rated pressure( whatever is specified from manufacture) in the injector setup screen.
Example, I use 315 kpa base fuel pressure and min effective pulse width of 0.2048 (entered in the Fuel Main screen).
Then my injector flow is 1066cc/min @ 300kpa pressure (entered in the Injector setup screen)
My ID injectors include injector flow data at multiple pressures, so I tend to use the one closest to my base fuel pressure.
Dead times and minimum effective pulse widths is great data to enter as well if you have it. -
I tried going with a higher value in the Post start enrichment % in the 70-90 degree ECT and longer post start decay time (20 seconds) to see if having the decay timing longer then my closed loop lambda timer lockout (18 seconds) It helped a little bit. Still went into a lean condition but for a shorter amount of time.
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So just a quick rundown, this is my first time getting a vehicle to start and run with a plug&play system. R32 GTR Rb26 itb engine setup. Any advice in general if you have the time to look it over would be great! Keep in mind, it has not been tuned by my tuner yet, I am strictly driving around under 4500 rpm and max roughly 60% throttle for break in and basically just learning how to set it up myself. So far I've been very successful and extremely happy with this ECU.
One small problem I am having is this lean condition after hot startups. I understand it's probably from heat soak from fuel and stock location IAT sensor. It's quick and clears out once closed loop control comes into effect it seems. I tried some changes to the post-start enrichment and decay time but with little change. Cooler ECT it's not as bad.
Thoughts here?
Lean Spike Between Gears
in G4+
Posted
Closed loop cuts off at 4k. Fuel table is well done by friend who is experienced. We will drop the values in the 0 TPS, 5k+ RPM range to help clean up the sudden rich area when the throttles shut. It's a little tricky being an ITB setup but we will get it sorted.
Thanks for the help.