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Old 02-02-2009, 02:43 PM   #1
NotBoosted
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Default New possible tuning tool for piggybacks

For anyone using a piggyback like the e-manage ultimate, you know how important it is not to apply big fuel changes when the stock ECU is in closed loop.

If you make any big changes in closed loop, the stock ECU dials them out with long term fuel trims. Those LTFT's get carried into open loop where they affect your max power tuning.

I have an e-manage ultimate, and it has the 2 input "option" ports. I have my A/F gauge plugged into one and the other is open. If I had a way to tell the E-manage when the stock ECU was in open loop (via the 2nd option input), it could use that signal to switch to my max power map. That way, all the major fuel changes wouldn't affect the stock ECU's long term fuel trims.

What do you think? I found a company that would make a unit to send that signal to the E-Manage if the demand is high enough. Would anyone be interested in using something like this?
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Old 02-02-2009, 10:03 PM   #2
master c
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i dont have any more open slots - i use option 1 for the pressure sensor and option 2 for wideband afr
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Old 02-03-2009, 01:24 AM   #3
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Quote:
Originally Posted by master c View Post
i dont have any more open slots - i use option 1 for the pressure sensor and option 2 for wideband afr
Bingo.

With this set-up the EMU knows how to make the necessary adjustments to greatly aid in tuning and the way the unit functions overall.

I never had a problem with open-loop and closed-loop conditions overlapping when using the EMU.
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Old 02-03-2009, 02:02 AM   #4
Brydon
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I don't get it? Your LTFT should be very close to zero. If not you need to retune it. Then it never effects your open loop and you are free to tune away. Problem solved for free!
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Old 02-03-2009, 02:43 PM   #5
#522
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Not sure if they are useable for this, but the EMU has the Serial/switch port as well.

Second, what kind of car are you looking into boosting? I have an 01 RS and it has been a challenge to stop the ECU from wanting to stay in closed loop until well into boost. Others (Brydon notably) have had much success with the 00/01 RS's and people with the 98 MAF RS's and L's have had good success as well. So if it is possible to do without a switch.

I would however be interested in something to tell the FACTORY ecu to go into open loop faster.
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Old 02-04-2009, 10:38 AM   #6
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Quote:
Originally Posted by PhilSine View Post
Bingo.

With this set-up the EMU knows how to make the necessary adjustments to greatly aid in tuning and the way the unit functions overall.

I never had a problem with open-loop and closed-loop conditions overlapping when using the EMU.
Are you saying to leave the EMU in auto tune using the added O2 sensor? I have not heard good things about the Auto tune other than use it to get close then turn off and final tune by hand.
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Old 02-04-2009, 01:00 PM   #7
master c
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ive seen people using the auto tune at really low % change so when weather conditions change the map will still be accurate to a given afr
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Old 02-04-2009, 01:49 PM   #8
mxpunk
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if someone found a way to just change the cl/ol delays on these ecu's and maybe even redial the injectors down, there'd be ALOT of potential using the EMU.
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Old 02-04-2009, 05:04 PM   #9
#522
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/\ Exactly. That is the only real issue I have run into. It seems if I lower the duty cycle on my GMBCS to induce some turbo lag, it is easier to tune. It looks like the ECU Sees the parameters met for open loop, then waits to make sure nothing changes, then as long as it is still nice and lean, it proceeds into open loop. If the boost comes on too fast, sending my emu into the areas of the map with extra fuel too fast, the ECU doesn't get that delay it is looking for.

When I "roll" onto the gas, it seems to like that better. I also know you can use the Accel map to control adding/subtracting fuel based on how fast you hit the accelerator, so I will be looking into that.

So anyway, sorry to go off on a tangent. NotBoosted-AS far as telling the emu when your car is in open loop, I could see how that could work, if you could control a boost control solenoid as well. for instance, your EMU is set to limit boost until it gets the "OK" from the ecu, then, The boost can come on, and with the pressure sensor hooked up, enter into the "power" areas of your fuel/timing maps.

Another thought I've had was something to tell the ECU everything is OK. Many people running bolt on turbos (on other makes) will intercept the O2 sensor, essentially telling the factory ECU the AFR's it wants to see so it thinks everything is cool all while you are running AFR's more ideal for positive manifold pressure. If someone figured that out, I would be all over that. From what I understand, our cars front wideband has 2 signal wires instead of one and I don't know if anyone figured it out ever.
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Old 02-04-2009, 10:07 PM   #10
master c
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what about greddy F-Manage???
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