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Old 05-02-2015, 05:11 PM   #61
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Quote:
Originally Posted by Schuyler View Post
I nominate you test dummy, and expect a full report on my desk by Monday.
I feel like HH has this documented in another thread? Of course the link escapes me at the moment... I've also been following closely, we have the same MS3-B and GM flexfuel sensor.
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Old 05-05-2015, 09:41 AM   #62
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Got my wally 255 installed last night. it was incredibly easy, except that the installation kit I bought had a wiring harness that didn't quite reach from the fuel pump to the holder-thinger.

So I took it to the basement and soldered in a 2" extension.

And then it turned out the other end of the wiring harness was the wrong plug to plug into the holder-thinger. It was very, very close, but the clip was on the wrong side.

So I took it to the basement and cut both harnesses apart and soldered them together so it would work.

---

Got my injectors yesterday, too! Was super duper excited, ripped open the package, they're sooooo pretty. But no pigtails. Double checked the packaging slip. Definitely supposed to have pigtails. Double checked stock injectors just to make sure they wouldn't fit without pigtails... definitely need pigtails.

Called them this morning, they're going to get a set of pigtails sent out to me. So that sucks. But still itshappening.gif

---

Wally 255 screams like a little girl.
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Old 05-05-2015, 06:56 PM   #63
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Wally 255 screams like a little girl.
That's a "feature" to let you know its running
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Old 05-05-2015, 07:34 PM   #64
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What kind of FPRs are the folks who run the Walboro 255 and bigger using? I've seen some factory FPRs get overwhelmed by the big pumps.
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Old 05-05-2015, 08:00 PM   #65
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I use a DE200 pump that is quiet as the OEM unit, FPR wise a rising rate AEM unit that keeps the presure without spikes when closing the trottle, also added a presure sender that i connect to my oil presure gauge when making fuel presure changes or when tuning.


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Old 05-06-2015, 12:23 AM   #66
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Originally Posted by Lincoln Logs View Post
What kind of FPRs are the folks who run the Walboro 255 and bigger using? I've seen some factory FPRs get overwhelmed by the big pumps.
Most of the big boy pants builds are running either Fuelab or AEM manifold referenced regulators. I've personally never experienced it but I've read about the stock 90-93 regulators and return systems being overwhelmed by the 255 pumps.

I'm personally running a DW200 (255lph) with the stock non-referenced and non-return NB1 system and it seems to be doing fine on CA91. Its MUCH quieter than the Walbro 190HP it replaced. It *should* be enough pump for my modest goals when E85 eventually becomes available in my area.
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Old 05-06-2015, 09:24 AM   #67
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Wally 255 with stock NB1 fuel regulation system.

AFRs are right where they were on stock fuel pump, so I don't believe I'm overpowering the FPR. I'm tempted to take it to redline to see if my AFR there is drastically richer than it was on stock FPR, meaning I could turn down my DC a bit--but I think I'd rather just put my new injectors in and not risk it.

I don't mind the scream. It's my constant companion.
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Old 05-06-2015, 04:28 PM   #68
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Originally Posted by HHammerly View Post
Actually this is what i installed and is not the same as what Soviet posted. Attached is what i got from Reverant (i have an MS3 basic)
All that is is a simple voltage divider. It wouldn't do anything to filter out weird noise.

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Originally Posted by soviet View Post
My E85 sensor is chilling in my parts pile so I can't comment on this.

But search around I found a thread on ms forums with people having the same issue. In that thread there is this wiring mod to smooth the noisy signal (the thread has a broken link but I h4x)

This circuit is a low pass RC filter. It effectively throws away signals that are of a higher frequency than the cut-off frequency.

Cutoff frequency is calculated with the equation:



Using the values above we get a cutoff of ~1500hz

So that circuit that soviet posted filters any frequency above 1500hz won't be seen by the MS.

Flex fuel sensors work by modifying the frequency of the signal to signify different amounts of ethanol. So the megasquirt might be picking up the noise as different frequencies and creating spikes. The range of the GM sensors is like 50-150Hz so I would start with that circuit and see if it made a difference, and then try and change R and C values to get the filtering down to a lower frequency.

I just paid for my GM sensor so I'll definitely by trying this stuff out soon.
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Old 05-06-2015, 04:46 PM   #69
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Also, that is using the direct MS3 flex fuel input. The MS3x has some sort of hardware capture circuit. Whether it is filtered or not I don't know. The MS3x schematics are embarrassingly bad. Scanned with a potato, and not searchable. I know it at least has a 5V pull-up.

Doing more reading it looks like it is a digital input, so just on or off signal.
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Old 05-06-2015, 08:16 PM   #70
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I just paid for my GM sensor so I'll definitely by trying this stuff out soon.
What specific PN GM sensor did you purchase?
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Old 05-06-2015, 08:21 PM   #71
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PN: 13577379

Its the cheapest one I found that I found links with people saying "this worked for me."

This:

Megasquirt Support Forum (MSEXTRA) ? Set up Continental Flex Fuel Sensor 13577394 (View topic)

And this:

Affordable Flex Fuel Sensor - Page 3 - MR2 Owners Club Message Board
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Old 05-06-2015, 09:08 PM   #72
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Humm... I bought 13577394. I wonder what the difference is? They are both under $70, I'll definitely be following along as you play with it
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Old 05-06-2015, 09:09 PM   #73
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Originally Posted by EO2K View Post
Humm... I bought 13577394. I wonder what the difference is? They are both under $70, I'll definitely be following along as you play with it
See second link. Yours has long fittings. Hopefully mine still works.

You have a basic MS3 no? Same as HHamerly? You will have to play with your soldering iron to add a capacitor.
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Old 05-06-2015, 09:11 PM   #74
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Originally Posted by FIT-Performance
The]MR2 Owners Club Message Board - Reply to Topic[/url] part number for the above sensor, the smallest I've seen thus far is, 13577429 and is the cheapest so far, running about $44 from GMPartsDirect. Not sure if they will switch to this sensor on all new flex fuel cars, but it is the latest model and introduced on the 2012+ Chevy Equinox Flex Fuel.

To recap:

Small - 13577429: $44



Medium - 13577379: $66



Large - 13577394: $66



Also there is the sensor harness for it if you don't want to modify the connector:

8" Harness - 13352241: $8




Differences between the sensors: The large and medium sensor is the same, only the tube length differs. The tube length between the medium and small sensor is the same, but the sensor is different. Of note is that we still need to find out if the output from the small sensor is the same as the medium and large sensor, and that the small sensor will have to be attached in your own way as it does not have the bolt holes that the medium and large sensor have.

How the flex fuel sensor works: Clemson Vehicular Electronics Laboratory: Flex Fuel Sensors

Also, just so you have the info, the old all metal flex fuel sensor's part number is 12570260 and run about $326. I've seen companies out there selling flex fuel kits with this sensor charging $650 for the sensor and harness alone... tsk tsk... The only advantage of the all metal unit is that the output for it is well documented and linear (and should be available relatively easily in junk yards as it is of 2000-2005 vintage). The output for the new sensor just needs to be documented now that we have the info from Continental.

See above.
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Old 05-06-2015, 09:13 PM   #75
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Old 05-06-2015, 09:14 PM   #76
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Old 05-06-2015, 09:17 PM   #77
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Yep I've seen it and yes, I'm also on a MSLabs MS3-Basic. I thought HH sold his MS3-B and went Pro? maybe I'm imagining that

I'm not smart enough to figure this out on my own so I'm waiting for someone else to make it work so I can copy them.
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Old 05-06-2015, 09:18 PM   #78
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I'm hoping I'm smart enough. I'm not as worried about the signal as I am the actual tuning. I'm hoping I will pique curly's interests and he will help me tune the e85, and the table blending.
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Old 05-07-2015, 01:10 AM   #79
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For those of you like me looking to try this on the cheap, I've made a list of what cars those sensors came from for use in Pick-N-Pulls. Unfortunately the metal one is about the only one you're likely to find.

(Since bbcode tables aren't enabled)

If you find any discrepancies, let me know and I will update.
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Old 05-07-2015, 01:24 AM   #80
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I've never seen a e85 s10 with a functioning sensor, they all have CELs and nobody replaces them because they are 1/3 the cost of a new 2.2 s10.

They are bolted in a extra special mother-fcker place, too IIRC. On the frame under the AC box. I don't recall it being easy to get to.
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