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08-04-2003, 09:42 PM | #1 | |
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MAP to MAF conversion from UTEC??? Do it today with Xede.
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I put my money that someone with some time, know how and understanding of how the ECU would respond to this could run setups without the MAF now! Make a table with MAP as the load, set MAF as the input variable (not that it matters but something needs to be there), set MAF as the output variable, set the math function to absolute output and the adjust range to +/- 5v. Make the map 20x20 because I bet you will need it. Your fuel map will now be based only on your MAP and engine rpm - based on the voltage signal you send to the ECU as your MAF signal. You can do today what Utec is advertising as a future function - run without a MAF sensor - and convert the MAP signal into a MAF signal. There you have it - now this would be fun to do! Got wide-band? Come on someone step up, I wanna play.
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08-05-2003, 08:41 AM | #2 |
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You can do this with a Unichip already.
Or HKS VPC - although they don't make them anymore. I was going to do this with a uC at some point, been too busy. |
08-05-2003, 08:45 AM | #3 |
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I hope you don'tthink the UTEC's top row is Throttle position?
Imprezd~ |
08-05-2003, 09:24 AM | #4 |
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It isn't real clear to me what you meant (since last I looked all their rows in closed loop are TPS not just the top one), so I will have to guess.
I have no idea what TXS has in mind on achieving the conversion - but I am positive it will not use TPS as the load - it will have to use MAP to achieve the conversion and it will be achieved the same way it could be achieved now with Xede. I am merely saying that it can already be done with a very flexible tool (Xede) that most don't even realize how useful and powerful a piggyback it is. And as always am seeking input on my thoughts. Edit: looked again I see open loop fuel is a map load - so why is this a future ability instead of a current one, just move the map to the entire range. Last edited by turboICE; 08-05-2003 at 09:43 AM. |
08-05-2003, 09:32 AM | #5 |
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08-05-2003, 09:39 AM | #6 |
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Yeah taking over timing would be nice and it is a shame that it isn't there - but mapping TPS makes it much more drivable IMHO. Smooth transitions to and from any desired level of driving.
I am not even sure why someone would want to convert MAF to MAP on a piggyback - if I were at that point I would replace not augment the ECU. What is the point of totally overriding fuel, boost and timing via a piggy back - replace the whole thing at that point and get anti-lag also. Just thought it was interesting that it can be done in Xede and wanted to discuss it further. Now that I go back to UTEC documents - I am not real sure why this function hasn't already been released on it as well. Last edited by turboICE; 08-05-2003 at 09:46 AM. |
08-05-2003, 09:45 AM | #7 |
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I think plenty of people see the Xede as a very capable engine management solution.
I also think plenty of people do not have the confidence and experience to be left alone with it, and they know this. Hence, they buy a UTEC and are not left alone fumbling in the dark with something nobody knows about. Xede was last to market, not priced to make people consider it strongly enough as an alternative to the UTEC, not marketed for crap in the US, etc... How many people are at levels where they care about converting MAP to MAF... and are still using the stock ECU in any form? Don't get me wrong, I understand your point, and appreciate that you shared the info, but I think you're on your own in large part with your Xede. If you're trying to get more people interested in it for the sake of a community to work within, I suggest writing up your experience with it - its quirks, its great things, hypothetical tuning scenarios (or real ones) and how the problems were solved via Xede tuning, its lacking areas if any exist, etc. jblaine, $.50 - $.48 |
08-05-2003, 09:53 AM | #8 |
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I am doing that piecemeal on hackers as I can. In a week this one thread will have more activity than the entire Xede section of hackers. So there will be more interaction I will be given more to think about as a result I will be encouraged to continue my exploration. But as soon as I can afford a long block and other hardware - I will move to a full replacement anyway. But the experience on a piggyback until then can only further my knowledge.
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08-05-2003, 10:49 AM | #9 | |
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08-05-2003, 11:30 AM | #10 |
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I have and use the Xede - but I really don't see any reason to jump any ships. If I had already had a UTEC I probably would have stuck with it. I would like to see more active users of Xede to create an alternative ship for those that haven't boarded.
Timing is just one of UTEC's big pluses. It takes over timing and provides knock correction even along the ragged edge very well. Though the comments from some users would indicate to me they aren't well prepared for what that means with comments like - "I am getting a lot of knock, is knock bad?" To some extent having a tool that rides the conservative safety features of the ECU could be a plus for some users. Tuned properly there should be no sacrifice and some self-tuners would be protected from their own agressiveness. I went with Xede because I like the TPS transitions I have been able to map, its boost control is much more intuitive to me resulting in smooth curves with little effort at POT or WOT, the available loads and load points provide me with options I like, the interface is great and I can see visually in real time where I am on any map. Do I wish I had the option to take over timing - yes. But I am pleased with my current experiences with a timing overlay map (hmm how many timing maps are involved in determine my timing now is it 3 or 4 ) Do I wish there was more documentation - absolutely and anyone who has followed other threads knows how emphatically and continuously I am begging for some. (How many years has it been waiting on the WRX tuning guide? Oh wait they pulled those references right... ) |
08-05-2003, 11:55 AM | #11 | |
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Case in point.... if your go to 50% throttle in first, that may be 5 PSI... but in 5th that's 25 PSI.... if your running the same timing... that's bad.... very bad.... It became aparent quickly that MAP based loading would the way. As for MAP/MAF.... personally... I think for a day to day, MAF is FAR superior to MAP based loading... it's crankier in regards to leaks, etc... but it makes for much more accurate fueling conditions. MAP serves for 90% of the situations though, and is VERY adequate on it's ability to map a car.. but MAF based will allow for a more "ragged" tune that doesn't cross that line.. Another case in point.... If I tune a map for 20 PSI, and it works great on a 29 in/HG day, and it's on the edge, it'll run great! But when it's a 30 in/HG day, it'll knock, since I'm drawing that much more air per PSI now, and I'll be pushing the envelope... that's why I only tune on the higher end of the barometric days here. That way I've covered the worst common denominator. Jorge (RiftsWRX) www.ProjectWRX.com |
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08-05-2003, 01:06 PM | #12 |
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TPS is only being used as load for the TPS signal scaling - it works very well at smooth transitions to and from open loop and works consistently in each gear. No liability having the ability to map TPS scaling rather than a locked value at 60% TPS. If I am cruising at high speeds and approach a hill I want to maintain my speed without being switched back and forth between open and closed loops. A scaled TPS signal through a map does this very well. I am not using TPS as the load for any other map - MAP is the load on all my other maps currently.
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08-05-2003, 04:39 PM | #13 | |
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In most cases it would be setup as jehcpa mentiones, Yhe XEDE tells the ECU TPS is > 60%, then makes the appropriate timing and fueling changes based on the load of the user's choice. It does not have the inflexibility of the Unichip in only choosing ONE load map. Also, there are times when piggybacking the stock timing curve is useful. Most of the time the stock ECU changes timing, it does so for a reason When you eliminate the stock ECU learning bad behavior, (ECU in closed loop, with piggyback trying to make fueling changes, for instance) piggyback tuning actually makes a lot of sense. The safety features built into the ECU still exist, and you don't end up in danger of the stock ECU detecting knock that the UTEC doesn't, then suddenly switching fuel maps on you (from the low det to high det map) since the stock ECU can't correct that knocking in any other way. There are advantages and disadvantages to both methods. I'd understand them before misrepresenting a competitor's product. |
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08-05-2003, 04:54 PM | #14 |
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Well, OK I began to and corrected an almost misrepresentation of UTEC - I am not going to beat someone up for not knowing - that is part of the board to pass information on to others. So no harm, no foul - he misunderstood my statement regarding TPS and I corrected the misunderstanding.
Anyway - what I really wanted in this thread is to: 1. Am I right that Xede can run without a MAF sensor by simulating the MAF on a MAP loaded map sending an absolute voltage signal to the ECU? I think I am and am sure by now someone would have jumped on me if I was wrong. 2. That being the case I wanted to discuss how it would be done, what would be better about it, what would be worse, etc. Not because I have any intention of doing it anytime soon but just to have gone through the mental exercise at least and come away with a better understanding of it all. And heck if enough comes of the thread I might just try it out to see if I can do it. I am already logging MAP, MAF voltage, RPM, AFR in DD almost continuously on the off chance I ever want to try it and also to see if there is there is anything close to a regression upon which I could put together a scratch base map. 3. Or on the good chance I am just nuts to be told in the kindest terms possible find something else to occupy my time with. |
08-05-2003, 05:08 PM | #15 |
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Normally I wouldn't come down hard on someone like that, but misinformation can spread quickly.
When misinformation comes from joe user 50,000 it doesn't go very far, but when it comes from an active and well respected user it can spread very quickly. Combined with the fact he started trying to sound as if he's speaking on behalf of TurboXS ("our UTEC") it seemed even less appropriate. Sorry for the hijack. I wanted to explain my comments and why I thought them valid and necessary. I will not interrupt further. I only know the basics of the XEDE, not the details, so I can't comment on your original questions. |
08-05-2003, 05:42 PM | #16 | |
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As for the "our UTEC" comment.. having dumped 7 months into the beta testing, collaboration, and frustration *suppressed groan* of getting it to where it was the day UTEC was uttered publically, I feel a symbiotic affinity to it. Not so much that I'm representing TurboXS with that statement. Jorge (RiftsWRX) www.ProjectWRX.com |
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08-05-2003, 06:45 PM | #17 |
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Concillian no big deal no interruption - I have responded similarly I am sure - but usually after the third post of continued misinformation. I don't always fully communicate an idea and sometimes a reader fills in blanks with their own ideas so I don't mind restating once or twice.
I always look to Rift's responses anyway he generally has good insight on things and the input is valuable. The title was not meant to be inflammatory but to get attention and input. Someone could have come along thinking I am bashing UTEC and that isn't the case - that many users can't be wrong, but it doesn't mean it suits everybody. So anyone want to talk about MAP to MAF conversions either in Xede or in preparation for it being available in UTEC? |
08-06-2003, 12:48 AM | #18 |
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Here is the start of a stock fuel map MAF against MAP
Well here is a couple commutes worth of fuel logging to start working up a base. Might just have to try this for giggles since I have never done it - need to get a WBO2 now I guess. Also need enough people to get out of the way to get over 6k rpm a few times.
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08-06-2003, 02:38 AM | #19 |
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My only concern is that to accurately build a MAF signal from RPM and MAP input, you also need a VERY FAST responsing intake temp sensor on a turbo car. Differing intake temps can mean vastly different MAF values at the exact same RPM/load cell. It's particularly important on a turbo vehicle because if you've got two cars with different turbos and different intercoolers, a well-made MAF based map would be fine on either car, but a MAP based map would be completely different. This means a turbo or intercooler swap would require a COMPLETE re-tune of all cells under boost.
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08-06-2003, 03:33 AM | #20 |
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Link ECUs on old shape Impreza turbos do not always have IAT, none of them have charge temperature.
They work fine - in hotter conditions there is more fuel and less timing. Not very precise, but they work. If using a custom uC for this you could use a thermocouple, AD595 and have a fine sample rate. |
08-06-2003, 03:46 AM | #21 | |
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I had a very nice, consistent MAP-based program running on my Integra turbo via AEM's programmable EMS, but I surely wouldn't have expected it to run even decently on another car with anything but my exact set of equipment (in fact, I swapped a friend's map from the same engine, same turbo, but different intercooler, and it was WAY off according to mr. wideband!). A speed/density system will work just fine on a stock vehicle or any vehicle that has the benefit of a skilled tuner and sufficient time on a dyno or at least a road under controlled circumstances. |
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08-06-2003, 07:15 AM | #22 |
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Good feedback - so even though it might be possible to do this with Xede - it may not be feasible or desirable..? Xede does have several reserved inputs but no idea if they can be used for any type of temperature readings or not. Also I don't know if Xede will overlay its own maps i.e. a MAP loaded fuel map and a temp loaded fuel map. This may be the type of stuff that I was missing as to why noone has made the claim that this conversion should or could be done with Xede.
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10-01-2003, 06:44 PM | #23 | |
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Well at least ChipTorque has confirmed that this can be done today - eliminating the MAF is available from an interceptor:
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