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Old 06-23-2008, 11:31 PM   #1
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Generic ECU tuning thread

Ever done any tuning with an XCal? Predator? Other flash device?
What do you know about DIY tuning, or what would you like to know?

This is basically the tangent that was going on in Squilly's XCal2 question thread.


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Old 06-24-2008, 12:19 AM   #2
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ok im gonna post to subscribe....

ive done quite a bit of logging and tuning with the xcal2, and lots of searching on tuning theory. Rather than make a giant disorganized post on what ive learned, id be happy to answer any questions I can for anyone that has questions. Timing, transmission controls, fuel pressure, "what do I log?", etc...

Eventually maybe we can update the first post in an organized fashion. I believe the ultimate goal here is increase support for open source tuning, like Megasquirt, in the Focus community
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Old 06-24-2008, 08:11 AM   #3
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I typically try to stay out of these type of threads as my statements are usually biased....

I am one of the calibration engineers with SCT. I own an 03 SVT focus along with an 01 supercharged mustang and I try to just read the boards as an entusiast which doesn't always happen.

I can chime in now and again to help answer questions.
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Old 06-24-2008, 09:01 AM   #4
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You can be an enthusiast and still enjoy the tuning aspect of modification :)

bring on the questions! There are many many many knowledgeable people around here...
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Old 06-24-2008, 10:00 AM   #5
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Can you break down at the top level what things need to be controlled at all times, and what things only need to be responded to when certain conditions arise? Blow-off is one thing I can think of, but maybe that's all mechanically controlled (unless you install an electronic boost controller).
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Old 06-24-2008, 10:38 AM   #6
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hm ok I guess we can do this as a combo of turbo/nitrous/NA but please specify in your question to avoid confusion...

and I should also say what I post is going to be largely Focus-specific. A lot of the ideas can carry over to other cars, but every manufacturer's ECU is different.

Here is an incomplete list (additions are welcome), just the basics to get you started:

At ALL times:
spark advance
injector pulsewidth (and then lambda)
MAF counts (or load, depending on personal preference)
Throttle position (used mostly for auto trans controls, and also for the WOT and open loop flags)
RPM

^those 5 things are the basics of tuning.

In certain conditions:
knock sensor readings and actions
fuel pressure (if it gets too low, you have problems)
(others... this list is longer)

Blow-off is controlled solely by vacuum/boost. When you close the throttle and create vacuum in the mainfold, the vacuum line going to the BOV activates the valve and releases the pressure in the charge piping. It is not controlled electronically. The only thing a EBC does is change the action of the wastegate, not the BOV.
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Last edited by illinipo; 06-24-2008 at 01:29 PM.
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Old 06-24-2008, 10:54 AM   #7
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Quote:
Originally Posted by illinipo View Post
At ALL times:
MAF counts (or load, depending on personal preference)
Throttle position (used mostly for auto trans controls, and also for the WOT and open loop flags)
MAF and throttle (at least from the pedal) are inputs though, right? I mean you can influence MAF to a limited degree by setting up the engine to change MAF in the following cycles, but aren't both MAF and throttle measurements?

What's the relationship between throttle and lambda, and fuel pressure? Is it some basic formula, like fuel pressure * duty cycle = factor * throttle?
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Old 06-24-2008, 10:55 AM   #8
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Quote:
Originally Posted by illinipo View Post

Here is an incomplete list (additions are welcome), just the basics to get you started:

At ALL times:
spark advance
injector pulsewidth (lambda)
MAF counts (or load, depending on personal preference)
Throttle position (used mostly for auto trans controls, and also for the WOT and open loop flags)
RPM
While you are mostly correct above, there are a couple discrepencies:

-on a ford, fueling is handled by the base fuel table as your commanded (based on load and rpm.) Set that table to the afr you want; You then monitor your fuel trims and adjust your maf transfer function so that actual afr matches your commanded afr. Or you force the car into open loop, set your base fuel table to command what you want and adjust your transfer function based on afr readings from a wideband (you do this anyway for wot.)

-injector pulsewidth is just a single value and is actually in processor clock ticks not lambda. Your base fuel table is your lambda. Typically pulsewidth is only changed to the value needed when injectors are changed (each size injector has a different minimum pulsewidth value) then left alone and fueling is handled as above.

In general when tuning you have fuel and spark to worry about. There are many tables that go into each one but in it's simplest form that's it.
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Old 06-24-2008, 11:43 AM   #9
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I've seen these tables in other places. How does a tuner set the values? Cell by cell? Or is there a better way? It seems like the best tuners could tune really fast if they could just use a block of clay to describe desired A/F over different ranges, and tweak that. But it amounts to the same thing when working with a table, just slower.
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Old 06-24-2008, 12:45 PM   #10
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Can I correct you on something Blivit?

Though the numbers may reflect Lambda, they are actually AFR. In my eyes calling it Lambda could confuse some people, being Lambda values don't change for type of fuel someone may get the wrong idea that they can run any fuel at that Lambda value and be fine, when that is not the case.


And as far as MS and open source tuning goes, there are threads on the MS board about the Focus specifically as well as on Craig Moates's site, FYI.
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