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 Took apart and double checked the wiring. Its good, and cleaned it up/re-ran it. Cut the throttle cable to size. Now, so close to being done, I'm waiting on the downpipe so I have to make a test pipe out of the downpipe that came with the car so I can run the O2 sensor:  I've got a downpipe lined up, but I can't afford it right now and I just need to test the Megasquirt/tune the Air Fuel mixture. Unfortunately, I ruined the last of my cut off disks so I'll have to pick up more tomorrow.
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Mar 31, 2016 02:00
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 Test pipe completed.
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Mar 31, 2016 16:02
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Mar 31, 2016 17:00
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Better put a shield in front of the CV Boot... That'd be a real hot mess.
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Mar 31, 2016 18:26
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sharkytm posted:Better put a shield in front of the CV Boot... That'd be a real hot mess. It's only for initial setup for now. But yeah, need to pipe it away from that.
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Mar 31, 2016 18:34
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sharkytm posted:Better put a shield in front of the CV Boot... That'd be a real hot mess. Problem temporary rectified:  And then....  Screw you turbo stud. I'll do it with 3 for now.  Guys, I have one more sensor to wire up (coolant sensor) and then the Megasquirt is wired. And we can start putting the radiator back in and re-attatch the distributor wires. CommieGIR fucked around with this message at 03:23 on Apr 1, 2016 |
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Apr 1, 2016 03:20
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Coolant sensor is wired in, time to start re-installing accessories and the radiator. Also discovered I'm going to have to change the power steering pump bracket. Thankfully, there is one already available: http://www.efiexpress.com/catalog/product_info.php?products_id=132&osCsid=6c1354aaddaebb137bfa85dc60e85e0d
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Apr 2, 2016 06:22
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 Current Megasquirt issues: TPS isn't working at all or creeps up very slowly, suspect the TPS itself. Tried calibrating. Intake Temp Sensor report 170 Degrees Fahrenheit. That's not right. Coolant temp reports 78 degrees. Close but it's around 68 Ambient...so no. Gotta figure out how to set it up for coil trigger and batch fire and we're on our way
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Apr 3, 2016 06:21
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Well. TPS issue was the TPS and Idle Valve wires were MIS labelled 
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Apr 3, 2016 21:25
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Megasquirt Adventures, part Deux: Realized I had to make an internal mod to support triggering/tach from the Coil -. Done. Had to add a 36v Zenner Diode in reverse in D2 Verified Fuel map, done. Verified Megasquirt is sending a good signal to injectors via an LED and a resistor. Its pulsing the injectors on crank, as it should. Verified engine functionality with some starting fluid, it cranked and caught briefly without issue. Leaves me with: Either I have a bad fuel rail, fuel pressure regulator, or bad injectors.  
CommieGIR fucked around with this message at 04:14 on Apr 4, 2016 |
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Apr 4, 2016 03:58
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Polarity sensative Injectors? Say it ain't so!
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Apr 4, 2016 05:19
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https://www.youtube.com/watch?v=R3gZISoOUV8 We're in business.
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Apr 4, 2016 23:35
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Welp, the engine is running, things left to do: Fix/Isolate Idle Valve (not working) Fix/Isolate O2 Sensor (not working) Reinstall Brakes, install new rotors Get Intake Piping Take it to an exhaust shop to have the downpipe finished and connected to the main exhaust. Injector issues turned out to be the injectors were just jammed shut from age. After tapping each lightly, they work great. CommieGIR fucked around with this message at 05:21 on Apr 5, 2016 |
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Apr 5, 2016 05:00
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It's probably worth fixing/replacing the idle valve on the 3B, but fwiw I have had excellent results using the "cracked open throttle body with adjustment screw" trick using megasquirt. Keep up the good work. As a fellow 20v audi owner I love to see this thread progress.
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Apr 5, 2016 05:18
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Alabamarama posted:It's probably worth fixing/replacing the idle valve on the 3B, but fwiw I have had excellent results using the "cracked open throttle body with adjustment screw" trick using megasquirt. I tried three different Idle valves without much luck, and I shot the wires so I know it's setup right. But yeah, I'll probably just adjust the butterfly valve for now or rig the Idle Valve to the Idle switch on the Throttle Position Sensor.
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Apr 5, 2016 05:20
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Is it anything like the one on the AAN? I'll have a look a d see if I have a spare if you still haven't figured it out by next week (I'm out of town at the moment) I set the butterfly valve on my car running megasquirt so that it idled at 900rpm at ~60°F. When it was ~30°F it would idle at roughly 1000rpm and when it was ~90°F it would idle at roughly 800rpm. I may have those backwards but point is it worked great.
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Apr 5, 2016 05:42
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Can you just pull a PWM idle valve off a junkyard Mercedes or something? That seems to be the go-to fix in the Megasquirt community for incompatible/hard to find idle valves.
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Apr 5, 2016 16:58
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If it's that cylindrical Bosch idle valve then good luck getting it to work. Those are completely miserable, I finally gave up and disconnected mine after trying a third one, the engine seems to idle better without it.
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Apr 5, 2016 17:06
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Seat Safety Switch posted:Can you just pull a PWM idle valve off a junkyard Mercedes or something? That seems to be the go-to fix in the Megasquirt community for incompatible/hard to find idle valves. That is what Megasquirt recommends, and is probably what I'll do for now. 1500quidporsche posted:If it's that cylindrical Bosch idle valve then good luck getting it to work. Those are completely miserable, I finally gave up and disconnected mine after trying a third one, the engine seems to idle better without it. Yeah, and I'm not having any luck with it so I'm probably just going to rig the intake to idle.
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Apr 5, 2016 17:09
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If you're especially inclined to try a different one to see if the valve itself is the problem some late 90s/early 00s Kias and Hyundais used the exact same one.
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Apr 5, 2016 17:12
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1500quidporsche posted:If you're especially inclined to try a different one to see if the valve itself is the problem some late 90s/early 00s Kias and Hyundais used the exact same one. I'm certainly up for it.
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Apr 5, 2016 17:17
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https://youtu.be/gB9MlSDdA4c https://www.youtube.com/watch?v=X4VjDBg99kE
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Apr 5, 2016 18:27
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Sounds pretty good
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Apr 5, 2016 18:41
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What's up with your TPS reporting negative?
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Apr 5, 2016 19:32
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Seat Safety Switch posted:What's up with your TPS reporting negative? I'm suspecting noise, its perfectly zeroed with the engine off, but as soon as I turn the motor on, it drops low. I might isolate the ground for that one.
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Apr 5, 2016 20:07
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I re-did the distributor timing, it was way advanced, which explains the occassional backfire/cough: https://www.youtube.com/watch?v=aKVKs6Pc4WI
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Apr 6, 2016 02:52
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Sounds much happier. Grats on getting the MS working.
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Apr 6, 2016 04:14
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Happy tractor! Figure out the TPS yet?
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Apr 6, 2016 17:15
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Seat Safety Switch posted:Happy tractor! Figure out the TPS yet? Nope, even with isolate ground its pulling down to -2 at idle, even with the butterfly flap cracked for idle air. I may try using a ceramic capacitor to filter the signal to clean it up. I'm unsure if it will do anything, but worth a shot.
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Apr 6, 2016 17:24
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https://youtu.be/x781B1jHDvQ Ran to full operating temperature. Fan kicked on as I hoped and thermostat opened. Looking good. Hope to have it on wheels tomorrow to get the exhaust welded up.
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Apr 7, 2016 01:26
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CommieGIR posted:Nope, even with isolate ground its pulling down to -2 at idle, even with the butterfly flap cracked for idle air. Got a scope capture? Post it, there's plenty of EE's here who might be able to diagnose.
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Apr 7, 2016 03:26
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Apr 7, 2016 20:51
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Came to tell you to keep posting cool updates, then chuckled at your nerdy license plate.
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Apr 8, 2016 13:58
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Larrymer posted:Came to tell you to keep posting cool updates, then chuckled at your nerdy license plate.  That's my wifes. But to be fair, I got her into the Dune series.
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Apr 8, 2016 14:17
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CommieGIR posted:
Just wanted to quote this for looking back at how far we've come. This engine runs now.
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Apr 8, 2016 19:31
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Good job dude!
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Apr 9, 2016 18:02
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 Installed the custom power steering bracket, works great other than its lower than the old one so the stock v belt is too big.  Reorganized the Ignition wiring so it looks much nicer. 
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Apr 11, 2016 15:30
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goddamn is that engine pretty far forward. Looks good.
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Apr 11, 2016 16:20
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Larrymer posted:goddamn is that engine pretty far forward. It really is:  For comparison, an early Subaru:  The Audi B2/S1/S2 were all notable for being very nose heavy.
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Apr 11, 2016 16:39
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CommieGIR posted:
Why you gotta make me feel old?? The B4 chassis also had the engine entirely forward of the front axle. Not too many easy choices for packaging. Glad you got it running. I've always had a soft spot for 80s VAG.
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Apr 11, 2016 19:05
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