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03-27-2009, 06:08 AM | #55 |
Drives: Vios Join Date: Oct 2008
Location: Brunei
Posts: 82
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well i was told it was for new car with relearning issue, so any one got the $ and just order it already hehe because when reading this thread i think diz is the right gadget all of u been looking for
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03-27-2009, 08:43 AM | #56 | |
Banned
Drives: LB Join Date: Jul 2006
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Quote:
Onwards! |
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03-27-2009, 01:08 PM | #57 |
Super Moderator
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That's great news indeed! Please specify "power" as a requirement!
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03-27-2009, 11:44 PM | #58 |
Learn to Relax
Drives: 2007, Meteorite, LB Join Date: Dec 2008
Location: Anaheim, CA
Posts: 2,070
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I believe the AT and MT have different operating parameters. Will that have an affect on the piggyback?
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03-28-2009, 12:54 AM | #59 |
Drives: Yaris Hatch /Landrover D2 Join Date: Jun 2007
Location: Canada
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03-28-2009, 02:57 AM | #60 | |
vroom vroom
Drives: lil red 5-door Join Date: Sep 2006
Location: Bangkok, Thailand
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OK, here's my first draft:
Quote:
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03-28-2009, 02:58 AM | #61 |
vroom vroom
Drives: lil red 5-door Join Date: Sep 2006
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The AT ECU is completely separate, and apart from the different idling speed, I don't believe there is any difference at all between the ECUs
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The price of freedom of religion, or of speech, or of the press, is that we must put up with a good deal of rubbish. - Robert Jackson Bye bye 1NZ... |
03-28-2009, 03:04 AM | #62 |
Drives: Yaris Hatch /Landrover D2 Join Date: Jun 2007
Location: Canada
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03-29-2009, 02:28 AM | #63 |
Break'em off some.
Drives: 07 Yaris LB, 04 Cobra Join Date: Jan 2007
Location: So Cal, OC
Posts: 854
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Sounds like you got some good feedback Charles. I would be open to testing and tuning something like this.
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03-29-2009, 06:54 AM | #64 | |
vroom vroom
Drives: lil red 5-door Join Date: Sep 2006
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Well after some musing about this, there are two approaches to this whole fuelling debacle.
The first one is to try to tweak the closed loop operation to run richer on demand. This is rather difficult and would hinge on modification of the AF and O2 sensors to give the ECU the impression of running lean, causing it to make the AFR richer. The second one, which according to Long's findings, seems to be the Blitz approach (and a far more refined version of ZPI's), is to just forget about closed loop operation and trigger open loop when extra richness is required. He noticed on his Scangauge that as soon as the SC clutch was engaged and producing boost, the ECU switched to open loop Obviously the first method would be preferred, as it should keep the car completely OBD fault-free, so in theory have no problems with inspections. Now, looking at the reference manuals, it seems there are 3 types of open loop modes (my comments in italics): Quote:
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03-29-2009, 07:40 AM | #65 |
vroom vroom
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I'm looking again and again at the instructions and wiring diagram and the only input that the Blitz box has to the ECU is the MAF signal. So, the possibility is that OL DRIVE can be triggered by a MAF signal over a certain threshold. Long, does the SCII have any way to monitor MAF voltage?
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03-29-2009, 07:54 AM | #66 |
vroom vroom
Drives: lil red 5-door Join Date: Sep 2006
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back on the topic of the more elegant idea of closed loop tuning, URD has some rather interesting devices that could quite possibly solve this:
AFR Sensor calibrator: http://www.urdusa.com/product_info.p..._id=1230100028 Tweaks the AF sensor's signal, thus affecting the short term fuel trim for closed loop mode MAF sensor calibrator: http://www.urdusa.com/product_info.p..._id=1260198051 A regular piggyback style device to tweak the MAF signal to affect the fueling in open loop MAF + Timing calibrator: http://www.urdusa.com/product_info.p..._id=1260198051 This ought to be enough to cover open loop operation where the timing is maxed out by default. These products should be universal enough to work with our cars too but I am writing to them just in case, to see what input they may have
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03-29-2009, 09:15 AM | #67 |
vroom vroom
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Thanks Pavel, some good info there... do you mind if I post the excel file here in case anyone wants to have a look at it?
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03-29-2009, 09:31 AM | #68 |
vroom vroom
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well here's PK's data log of a drive in various conditions... mostly gentle driving, and you'll see several apparently random points where it goes to open loop, but looking carefully you'll see that it corresponds to the car slowing down and minimum throttle.. thus, DFCO!
can't attach excel files here, but here's a download link: http://dl.getdropbox.com/u/691356/Normal%20Run.xls
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03-29-2009, 12:01 PM | #69 |
Break'em off some.
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Why do you guys want to do closed loop fueling adjustments? They are not needed. The car is self adjusting (to a point) in closed loop.
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03-29-2009, 12:20 PM | #70 | |
vroom vroom
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Quote:
On the other hand, it is something I am not so sure about in the first place, at three quarters throttle, 4000RPM, for example, is there enough pressure from a SC/turbo that it would require fuel enrichment? Or am I barking up the wrong tree?
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The price of freedom of religion, or of speech, or of the press, is that we must put up with a good deal of rubbish. - Robert Jackson Bye bye 1NZ... |
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03-29-2009, 12:28 PM | #71 |
vroom vroom
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Pavel's newest run, equipped with a heavier foot:
http://dl.getdropbox.com/u/691356/1to3Run.xls note the relation between throttle % and open loop in the initial acceleration phase. Red numbers are shift points (hence the spot of 20% throttle which could be ignored)
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03-29-2009, 12:59 PM | #72 | |
Break'em off some.
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Quote:
You are thinking correctly. Generally forced induction cars go into open loop sooner than NA cars. Some NA cars don't hit open loop until you go WOT. My guess is that this is one reason the Blitz SC is clutch driven, so you are not getting boost at lower load areas. We can't see the actual AFR, but we can see his timing, which will be helpful. Can he graph injector latency or duty cycle too? If so get that on there. You can't hope to tune closed loop, no piggyback I have ever seen can do it. It just causes problems. |
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