09-24-2020, 11:51 PM | #995 | |
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Ah, I see. Thanks for the info on Harrop using the MAF sensor instead of the MAP sensor in their tune. I went ahead and ordered a 2.5 bar Omni MAP sensor to have on hand for my trip back up to Cincinnati for the flex-fuel, bigger injector and 85 mm pulley custom tune after I install the Harrop kit with their CARB tune. Just received my economic stimulus payment today, so I know exactly where that's going. |
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09-26-2020, 06:36 PM | #996 |
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Unless you max out the MAF you don't need a larger MAP and in most PD blowers I've seem (not seen the logs of a Harrop for some time) the pressure wave resonance in the manifold has a negative impact on a wider range sensor that the OEM one isn't able to detect, hence it will run better on the OEM sensor. This is why many recommend the D-Box but is actually able to be mapped out quite easily on EcuTek.
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09-26-2020, 08:44 PM | #997 | |
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Questions: If a tuner had both inputs, would it be better? My intuition is no or the DBox wouldn’t be necessary, but maybe it is a matter of it being used. What’s the limit of the stock MAF?
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09-28-2020, 11:14 AM | #998 |
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It would seem to me that installing a small chamber, maybe the size of a fuel filter, between the pressure port of the supercharger and the MAP sensor, would reduce the pressure pulses and the resonances and which would, in return, smooth out the electrical signal. The size of the chamber can be experimented with to find the right amount of "muffling". I don't think a $350 electronic box which simply smooths out the electronic signal is necessary when a simple inexpensive mechanical fix would work.
As for the limit of the MAF sensor, I believe Kodename47 was involved in a similar discussion here: https://www.ft86club.com/forums/showthread.php?t=106496 where Yobiwan was using a MAF sensor from a Forester with a higher limit. He posted some of his findings, but I don't have a way to read them. I looked a bit on EcuTek's site to see what the actual limit is for our OEM MAF sensor, like I did for the MAP sensor, but haven't found it yet. I do believe that the more, accurate and usable sensor inputs that a tuner can use, the better the tune and the resulting performance will be. |
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09-28-2020, 11:45 AM | #999 | |
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09-28-2020, 12:35 PM | #1000 | |
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Edit: Do I win anything for having the 1000th post on this one topic?
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09-29-2020, 05:40 PM | #1001 | |
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all temps are cooler than expected 190 F ECT 190 - 220 F Oil T (somewhat varies with ambient) IAT varies with ambient but no more than 35F above ambient with 70 mm pulley (throttle limited to 13 psi)
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09-30-2020, 08:45 PM | #1002 |
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I ordered my CARB tune today!
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10-02-2020, 02:02 PM | #1003 | |
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OK I'm being silly, but the size/design of the intake will vary what the MAF reads for any given volume, hence the need for MAF scaling. The stock ECU uses a combination of MAF and MAP, I would assume there is some multiplier for MAP but I've not seen anyone, including EcuTek determine the logic. Hence why fluctuations cause interesting fuelling and less than optimal power. I also reckon that if you went pure SD or relied purely on the MAP for custom mapping then you're only going to get this or worse as there is no MAF basis to damp it out. Here's a Cosworth SC, top is with Custom Map fuel smoothing, bottom is using the ECU's own fuelling strategy. You can see where the MAP signal starts to become erratic.
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10-02-2020, 05:30 PM | #1004 |
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10-02-2020, 11:59 PM | #1005 |
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So pneumatically smoothing out the pressure pulses before they get to the MAP sensor would be beneficial in ANY tune where the MAP sensor input is used. Does everyone agree? I'm trying to convince my tuner of this before I allow him to custom tune my engine.
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10-03-2020, 02:04 AM | #1006 | |
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Some boosted engines have map sensor filters supposedly to keep oil out of the sensor. It might have a dual action of smoothing out the signal. What do you guys think? https://www.performancedieselinterco...-sensor-filter
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10-03-2020, 03:05 AM | #1007 |
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Speaking of, when you have multiple tunes w/ Ecutek does switching between them also switch the CVN? And if the first tune is selected, does having a second tune also available effect the CVN when the first is selected?
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10-03-2020, 10:44 AM | #1008 | |
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I found this during my research. It's called the Pulse Plus built by REOTEMP which appears to be exactly what would be needed. I just found it last night and haven't looked at prices or tried to contact them as to where they can be obtained, but this device should work to solve the problem. Here's a link to their website: https://reotemp.com/pressure/diaphragm-seals/
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