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Old 07-28-2017, 03:04 PM   #126
dvazriel
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Quote:
Originally Posted by peekeesh View Post
1) yes. I bought mine at o reillys.
3) buy the plugs from ballenger motorsports.
Thanks bro.

1) What are those connectors called?


Quote:
Originally Posted by peekeesh View Post
1) yes. I bought mine at o reillys.
3) buy the plugs from ballenger motorsports.

Assuming the plugs are same from 2008-2014 wrx sti, you can get parts listed below.

Conn-75836 - optional, if you plan to delete rear o2 and power the ECA from rear o2 wires.
Not sure on this, i don't want to delete the o2 sensor, i want to tap into 12v, sorta like a splice.

I got this from Cobbs install manual:
Quote:
The TGV connection allows the motor signals to pass through for those still using the factory TGV's, however the feedback normally used to check TGV position is used to transmit Ethanol content data to the ECU (Engine Control Unit).
I need to bypass the 5v coming from the tgv and use the 5v from the sensor instead.
Fvk it, it seems to be easier just to have the TGV's deleted. Ill need a tune anyways might as well. One thing this ECA is that i might be able route the cables thru the firewall and keep it in the gloves box instead of the engine bay. The problem with the 2016+ WRX is that there is no way to test it since we don't have ATR unless we fork the $150, with ATR we can't enable the custom monitors and check if we are getting a value or not
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Last edited by dvazriel; 07-28-2017 at 03:15 PM.
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Old 07-28-2017, 03:25 PM   #127
peekeesh
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They are called fuel line quick connectors
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Old 07-28-2017, 03:58 PM   #128
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Subscribed for future reference.
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Old 07-28-2017, 06:14 PM   #129
dvazriel
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I got a few junkyards relatively close, imma have to stop by and see if i can get some of those TGV and o2 connectors for cheap and check fit.

Since i won't have a ATR to enable those sensors in the AP, I guess i can use a multimeter and measure the 5v input line into the tgv.
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Old 07-30-2017, 12:26 AM   #130
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noticed a few weird things when i fired it up. first, some 87 gas i had lying around tested to be 13% ethanol; is this possible? tested some local e85, registered about 75% ethanol in my sensor. lastly, i tried 93 and it was also 13% ethanol. should i adjust the sensor to get the pump 93/87 back down to 9%? how would i go about doing this?
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Old 07-30-2017, 02:13 AM   #131
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Quote:
Originally Posted by mikeywalrath View Post
noticed a few weird things when i fired it up. first, some 87 gas i had lying around tested to be 13% ethanol; is this possible? tested some local e85, registered about 75% ethanol in my sensor. lastly, i tried 93 and it was also 13% ethanol. should i adjust the sensor to get the pump 93/87 back down to 9%? how would i go about doing this?
Usually pump gas has 10% but changes depending on season think winter its more
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Old 07-30-2017, 12:28 PM   #132
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Why is it that the voltage and ethanol value displayed on the serial monitor is different than the voltage that is put out by pin 11. Serial monitor shows 3.26v for my "e85" but the output on pin 11 shows 2.95 with multimeter
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Old 07-31-2017, 09:34 AM   #133
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Quote:
Originally Posted by mikeywalrath View Post
Why is it that the voltage and ethanol value displayed on the serial monitor is different than the voltage that is put out by pin 11. Serial monitor shows 3.26v for my "e85" but the output on pin 11 shows 2.95 with multimeter
The value on the serial is the intended voltage output. If you are not seeing that voltage it's either a rounding issue since the analog output only has 255 increments (5v/255). However you're seeing a more significant difference than that.

Check the voltage at your 5V pin. If that is not 5v then the analog output will be less because it's not actually 0-5V... it's 0-5VPin voltage (which may not be 5v). This is why I put in a register in my program to set the 5V pin voltage to a more correct value.
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Old 08-22-2017, 02:11 PM   #134
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Quote:
Originally Posted by Barge View Post
...On another note: The TGV plug for the 04-06 (I think those are the years) is basically impossible to find (cobb must have had a big batch made) but it's the exact same pins and seals as a standard receptacle. So i just bought 3 ping plug and receptacles and repinned the harness connector (receptacle) and I can now use a standard easy to purchase plug. It was super easy to do. I'll get some links added in here when I get everything tidied up...
Quote:
Originally Posted by Barge View Post
Just as an FYI for anyone doing 04-07 the connectors I used at the TGV I got from Ballenger Motorsports. (Not sure if i can link... so...)
CONN-75765 (you really only need CONN-100292 but I got pins and seals in case)
CONN-75764
The 757765 housing will fit on the existing pins and seals. You just depin and shove them in the new housing and then you have a standard connector you can mate to without hacking things. Plus you can always put the old housing back on.
I was looking for a harness connector solution and I think this will work perfectly. Instead of buying the COBB fuel psi kit (225) I'm planning to building my own kit which I can select the AEM 100psig sender instead of the AutoMeter sender. Thank you Sir!
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Old 08-27-2017, 04:56 PM   #135
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So, after some experimenting with Barge's method of simply using the TGV connector, it seems that the voltage will fluctuate wildly during heavier throttle, I was seeing Ethanol content swinging wildly between 0 and 88%.

It seems that a capacitor is probably needed between the 5v pin and ground.

EDIT: Cruising around it was just fine.

Last edited by ShinjiML; 08-27-2017 at 05:06 PM.
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Old 08-28-2017, 12:53 PM   #136
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Quote:
Originally Posted by ShinjiML View Post
So, after some experimenting with Barge's method of simply using the TGV connector, it seems that the voltage will fluctuate wildly during heavier throttle, I was seeing Ethanol content swinging wildly between 0 and 88%.

It seems that a capacitor is probably needed between the 5v pin and ground.

EDIT: Cruising around it was just fine.
Where do you have your sensor mounted?

Are you monitoring fuel pressure?

Cobb actually recommends installing the sensor before the FPR because they said otherwise they see erratic swings in ethanol content because there isn't enough flow.

I'd find it very odd that a sensor voltage supplied by the ECU is that erratic during WOT. Unless the ECU is actually messing with it.

Do you have any way to log the actual voltage? I'll get around to all this my car just has no suspension right now.
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Old 08-28-2017, 01:31 PM   #137
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FYI. The Cobb software has a table "Ethanol Sensor Concentration Failsafe" with a g/rev load limit that the system holds the last good value previous to the load limit.

So if you are getting fluctuations at higher loads to do fuel flow causes sensor reading issues it doesn't actually affect the fueling calcs.
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Old 08-28-2017, 01:37 PM   #138
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Switched the power source to the rear O2 with a pass through harness and it has stabilized the ethanol readings even under WOT. Only change is the power source and the addition of the VR.

I think a capacitor is really needed if the TGV is used as a power source.
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Old 08-28-2017, 05:12 PM   #139
Barge
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Quote:
Originally Posted by ShinjiML View Post
Switched the power source to the rear O2 with a pass through harness and it has stabilized the ethanol readings even under WOT. Only change is the power source and the addition of the VR.

I think a capacitor is really needed if the TGV is used as a power source.
Good to know... I know some people had issues with it originally but I didn't find much information on how they hooked it up, tested, etc.

I'll have to check the tgv signal descriptions in the manual to see if there's any more info there.
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Old 08-28-2017, 05:15 PM   #140
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Also...I just got a 3d printer so I'll be starting trying to figure out 3d CAD and design an enclosure for this to make it even cleaner. Plastic I'm using is good up to 250f so should handle engine bay.

If anyone has any ideas of ideal mounting location...existing holes, brackets, etc... Or features etc...please let me know.

I should be able to print them up pretty affordably and I'll put the design on thingverse when it's done.
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Old 10-03-2017, 12:42 PM   #141
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Quote:
Originally Posted by Barge View Post
Also...I just got a 3d printer so I'll be starting trying to figure out 3d CAD and design an enclosure for this to make it even cleaner. Plastic I'm using is good up to 250f so should handle engine bay.

If anyone has any ideas of ideal mounting location...existing holes, brackets, etc... Or features etc...please let me know.

I should be able to print them up pretty affordably and I'll put the design on thingverse when it's done.
Hey Barge, did you ever start putting these out?
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Old 10-05-2017, 02:07 PM   #142
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Thank you so much for this, I plan on doing it pretty soon.
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Old 10-10-2017, 10:02 AM   #143
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Hey Barge, did you ever start putting these out?
I have not yet... I've been swamped at my job that actually pays for this expensive hobby.

My car should be back together and running this weekend and after that I can spend some more time on getting this flex fuel stuff tested more thoroughly.

I'm looking into some much smaller arduino's as well to try to make something more compact and easier to mount anywhere.
Adafruit Trinket
I've got one of these for testing. I may have to use a different method for frequency measurement though because it has some pared down functionality.

I had a flex converter version on order before I started along this path so i'll be able to compare them to make sure my version works well.

I've also been doing some research in just a freq-voltage converter to make something more affordable that wouldn't need any programming by an end user.
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