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Old 05-17-2010, 08:27 PM   #31
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You way WONT WORK , if you set idle / cruise target in OL to 12.1 then when you go back to closed loop it targets 14.7 which is where idle and cruise should be targeting so the trim is WAY off and you still have to make adjustments to the MTF

You should never target the idle , cruise for 12`s allways 14.7 , 14.7 is stoich

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Old 05-17-2010, 08:38 PM   #32
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Actually Tom that way does work, maybe you're just misunderstanding something in his process? If 12 is in the base table and you tune perfectly to 12 in open loop then when you go back closed loop it will be spot on 14.7. Base table is the target no matter what in open loop. And the MTF doesnt care about what afr it is targeting.

But man it is so much easier to just use the trims
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Old 05-17-2010, 09:17 PM   #33
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I'm glad somebody understands.

I know it works cause i've done it. Several times. Mostly OBD1 cars though. With no way to watch fuel trims.
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Old 05-18-2010, 02:14 PM   #34
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I have a late thank-you.

Quote:
Originally Posted by ford_boy @ 05-15-2010 05:38 PM View Post
1. Force the EEC to run in open loop. This makes it much easier to tune the lower voltage part of the function because the o2 sensor is not having any say over fuel... ... if at 1.2 volts your afr is 14:1 and your target afr is 12:1 then you need to multiply the airflow value at 1.2 volts by 1.16. You go through all of the values from 0v to 2v in the same manner.
When I first started thinking about tuning my Focus, I thought I needed to do that, but then I talked to Pete, who had already done some Focus tuning, and he basically said:

Quote:
Originally Posted by illinipo @ 05-15-2010 08:17 PM View Post
Why, when the trims tell you exactly where you need to be?
...which saved me a LOT of time

Also, thanks to Tom, who said the same thing as Pete, just in a few more words (and a day later )

Quote:
Originally Posted by 1turbofocus @ 05-16-2010 04:28 PM View Post
the closed loop function trims the fuel automaticly at idle and part throttle , change your MTF by how much the closed loop is trimming by % wise and your done
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Old 06-12-2010, 02:23 PM   #35
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Working on the tune now...
FYI, I have 55# injectors.
I took my previous tune which ran/idled fine and reset the values that were changed specifically for the MAFia (IM volume, engine displacement, FI high slope, FI low slope).
I also reloaded the MTF table back to stock, then multiplied by 1.50.
I have not fine-tuned the MTF because I haven't driven anywhere yet.

Right now the STFT is fantastic, but my idle is sputtering around 800-1000 RPMs, not drastic like there was a vac leak, but very "rough".
There is also some roughness when holding the throttle steady open.
So let's just say there's roughness across the board.

Any help appreciated.

Seems as if I've missed some injector settings or displacement/manifold adjustment somewhere.
Doesn't seem to be any vac leaks.

EDIT:

For troubleshooting purposes, here are the things I changed not dealing with the tune:
- New pipe from FMIC to throttle body: 2.5" out of IC for appx 90* and then to 3" to throttle body (2.75").
- MAF is positioned after around 10" of straight 3" pipe.
- Moved the coolant expansion tank to make room for the air filter and new ambient pipe (2.5").
- Cut off most of the bracket which the expansion tank mounted to, but maintained a section for the ground cable.
- Removed the evap canister (I believe that's what it's called) to repair a broken nipple, which was previously causing a vac leak.
- Had the turbo fitted with a larger compressor wheel and the housing machined.
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Last edited by sporadic; 06-12-2010 at 04:10 PM.
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Old 06-12-2010, 04:22 PM   #36
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Picture of the new MAF tube:
Help appreciated!

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Old 06-12-2010, 04:28 PM   #37
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I dont mind helping but would need to see some datalogs

My IM is hpdyno on AOL

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Old 06-12-2010, 04:31 PM   #38
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Thanks Tom, you don't know how much I appreciate it.
Let me know what you'd like to see in the logs.
I probably wasn't monitoring as much as you would even though I saved my log, so I'll need to do more logging real quick.
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Old 06-12-2010, 05:53 PM   #39
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just send me what you have , then we can go from there

Tom
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Old 06-12-2010, 06:09 PM   #40
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OK. Want me to email it to you? I need your email.
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