Sulfur yellow 76: Megasquirted with tbi

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Toehead
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Sulfur yellow 76: Megasquirted with tbi

#1

Post by Toehead »

I plan on updating this as I go

The bike is a 76 sulfur yellow with 20k on it. (Shown below after megasquirt installation)
DSC_0534.JPG
Intake manifold is custom, with a geo metro TBI
DSC_0531.JPG
DSC_0514.JPG
Airtex fuel pump.

Microsquirt controller
DSC_0511.JPG
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Last edited by Toehead on Mon Apr 04, 2016 9:46 pm, edited 1 time in total.
2012 Golf TDI, fast and frugal oil burner
1980 CX500C, All around road warrior (Sold)
1975 TS125 (Sold), old smoker
1977 naked GL1000, Highway cruiser
'81 GL1100 14,000 (reconditioned and sold)
'81 GL1100 50,000 miles (under construction)
2X 1981 CM400 beginner bike (sold)
1980 CB750C (sold)
1994 Virago 750 (Wifey's bike)
'76 GL1000 Sulphur Yellow (Megasquirted efi build) http://www.ngwclub.com/forum/viewtopic.php?f=47&t=59774
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Toehead
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Re: Sulfur yellow 76: Megasquirted with tbi

#2

Post by Toehead »

Fuel return is a block I machined to replace the petcock. It draws through the reserve (My gas gauge works fine ;) ) and returns through the ON
DSC_0524.JPG
DSC_0526.JPG
Air cleaner and throttle body fit nicely under the new electronics tray
DSC_0533.JPG

I'll take some more pics soon! I had it idling well and spent some time yesterday cruising around. I runs very well, and the intake roar is very cool :)

Unfortunately the microsquirt computer is acting up. After my nice ride, I returned to the garage and it woudn't communicate over serial. Tried multiple computer (including native serial ports) and nothing works. I then proceeded to try to reflash it (I thought it might be corrupted) and bricked it (partial reflash). I'm dead in the water until I get it repaired to replaced. I suspect a hardware failure on the max3221 chip, as it didn't affect the running of the bike at all. Will keep you posted.
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Last edited by Toehead on Tue Apr 05, 2016 6:44 am, edited 1 time in total.
2012 Golf TDI, fast and frugal oil burner
1980 CX500C, All around road warrior (Sold)
1975 TS125 (Sold), old smoker
1977 naked GL1000, Highway cruiser
'81 GL1100 14,000 (reconditioned and sold)
'81 GL1100 50,000 miles (under construction)
2X 1981 CM400 beginner bike (sold)
1980 CB750C (sold)
1994 Virago 750 (Wifey's bike)
'76 GL1000 Sulphur Yellow (Megasquirted efi build) http://www.ngwclub.com/forum/viewtopic.php?f=47&t=59774
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ericheath
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Re: Sulfur yellow 76: Megasquirted with tbi

#3

Post by ericheath »

You've been busy. Interesting fuel return line. Never would have thought of that one. Look forward to more reports.
Whatever I suggest here should be given ample time for a moderator to delicately correct. I apologize in advance.
77 WING, 1200 engine with 77 heads, cams, gl1100 foot pegs, Magna V65 front end, 764A carbs, [-gone Suzuki M109 monoshock--, replaced with gl1100 shocks] gl 1200 swing arm, gl1500 final drive, wheel and rear brakes Valkyrie seat, Meanstreak tank, Sportster pipes, Power Arc ignition off crank.
77 Wing. black
83 Wing, in pieces
"Continuing education is important even if the subject matter is fairly useless (as in this case)."---Greg Foresi
akolleth
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Re: Sulfur yellow 76: Megasquirted with tbi

#4

Post by akolleth »

Very nice indeed!
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wingrider
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Re: Sulfur yellow 76: Megasquirted with tbi

#5

Post by wingrider »

Keep the pictures coming! Looking at a Megasquirt myself for my 1200 project.
2002 1800 Wing
2001 Valkyrie Interstate
1978 1200 EFI Wing with Motorvation Coupe Royale sidecar
1977 1200 Wing cafe/bobber project
1974 Suzuki GT550
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socrace
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Re: Sulfur yellow 76: Megasquirted with tbi

#6

Post by socrace »

Nice work, especially the fuel return idea, and use of throttle body injectors. Too bad about the comms issue. I guess you checked the serial cable, seems like that would be more likely to fail than the internal chips.
1981 Goldwing Standard - efi'd, other stuff
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Toehead
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Re: Sulfur yellow 76: Megasquirted with tbi

#7

Post by Toehead »

Thanks Guys!

Yes, I tried multiple USB-serial adapters, multiple computers, and a computer with a native serial port with the same results on all.

Matt @ DIY sent me an RMA number and it is on the way back to be repaired. Ill keep everybody updated!

At least the weather isn't good :)


Sorace, I am really interested to see your base VE table, as well as where in the table your bike typically idles.
2012 Golf TDI, fast and frugal oil burner
1980 CX500C, All around road warrior (Sold)
1975 TS125 (Sold), old smoker
1977 naked GL1000, Highway cruiser
'81 GL1100 14,000 (reconditioned and sold)
'81 GL1100 50,000 miles (under construction)
2X 1981 CM400 beginner bike (sold)
1980 CB750C (sold)
1994 Virago 750 (Wifey's bike)
'76 GL1000 Sulphur Yellow (Megasquirted efi build) http://www.ngwclub.com/forum/viewtopic.php?f=47&t=59774
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socrace
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Re: Sulfur yellow 76: Megasquirted with tbi

#8

Post by socrace »

I'm sure Matt at diyautotune can get it straightened out.
Just wondering: are you using the Metro's idle air control?
Here's the ve table I ran all last year, Idles at about 60 Kpa and 1,000 rpm:
myvetablenov2014.png
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1981 Goldwing Standard - efi'd, other stuff
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Toehead
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Re: Sulfur yellow 76: Megasquirted with tbi

#9

Post by Toehead »

OK... This is also where I idle. It seemed like that was pretty weak vacuum, but if you are the same I guess it's fine :)

For idle control, no I am not. The Metro uses a coolant-temperature actuated fast idle valve (it is a wax capsule mechanical valve). I didn't want to run coolant lines to the throttle body, so I removed this valve and blocked it off. Right now, I just adjusted the throttle stop to have a good idle speed when warm. Of course this means you need to nurse the throttle when cold.

However, I have a PWM air control valve that just arrived. One I get my idle VE really dialed in so that it is stable, I will back the the throttle stop off and use PWM air control to maintain idle. This way cold start should be as simple as hitting the start button: No nursing required!
2012 Golf TDI, fast and frugal oil burner
1980 CX500C, All around road warrior (Sold)
1975 TS125 (Sold), old smoker
1977 naked GL1000, Highway cruiser
'81 GL1100 14,000 (reconditioned and sold)
'81 GL1100 50,000 miles (under construction)
2X 1981 CM400 beginner bike (sold)
1980 CB750C (sold)
1994 Virago 750 (Wifey's bike)
'76 GL1000 Sulphur Yellow (Megasquirted efi build) http://www.ngwclub.com/forum/viewtopic.php?f=47&t=59774
User avatar
Toehead
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Posts: 2135
Joined: Fri Jul 15, 2011 3:10 pm
Location: Mendon, MA

Re: Sulfur yellow 76: Megasquirted with tbi

#10

Post by Toehead »

Here is the type of throttle body that I used. It has a built in fuel pressure regulator, TPS, vac ports for MAP, etc..

Make sure you get the connector for the injector. They are really hard to find.

Image
2012 Golf TDI, fast and frugal oil burner
1980 CX500C, All around road warrior (Sold)
1975 TS125 (Sold), old smoker
1977 naked GL1000, Highway cruiser
'81 GL1100 14,000 (reconditioned and sold)
'81 GL1100 50,000 miles (under construction)
2X 1981 CM400 beginner bike (sold)
1980 CB750C (sold)
1994 Virago 750 (Wifey's bike)
'76 GL1000 Sulphur Yellow (Megasquirted efi build) http://www.ngwclub.com/forum/viewtopic.php?f=47&t=59774
DaveyG
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Re: Sulfur yellow 76: Megasquirted with tbi

#11

Post by DaveyG »

Definitely going to follow this thread!
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Toehead
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Re: Sulfur yellow 76: Megasquirted with tbi

#12

Post by Toehead »

Pwm idle control!
DSC_0542.JPG
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2012 Golf TDI, fast and frugal oil burner
1980 CX500C, All around road warrior (Sold)
1975 TS125 (Sold), old smoker
1977 naked GL1000, Highway cruiser
'81 GL1100 14,000 (reconditioned and sold)
'81 GL1100 50,000 miles (under construction)
2X 1981 CM400 beginner bike (sold)
1980 CB750C (sold)
1994 Virago 750 (Wifey's bike)
'76 GL1000 Sulphur Yellow (Megasquirted efi build) http://www.ngwclub.com/forum/viewtopic.php?f=47&t=59774
User avatar
Toehead
True Blue Steel Biker
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Posts: 2135
Joined: Fri Jul 15, 2011 3:10 pm
Location: Mendon, MA

Re: Sulfur yellow 76: Megasquirted with tbi

#13

Post by Toehead »

Matt @ DIY confirmed that the microsquirt has a bad board and is shipping me a new one under warranty (the units have a 1 year warranty). I'm excited to get back on the road...
2012 Golf TDI, fast and frugal oil burner
1980 CX500C, All around road warrior (Sold)
1975 TS125 (Sold), old smoker
1977 naked GL1000, Highway cruiser
'81 GL1100 14,000 (reconditioned and sold)
'81 GL1100 50,000 miles (under construction)
2X 1981 CM400 beginner bike (sold)
1980 CB750C (sold)
1994 Virago 750 (Wifey's bike)
'76 GL1000 Sulphur Yellow (Megasquirted efi build) http://www.ngwclub.com/forum/viewtopic.php?f=47&t=59774
User avatar
Toehead
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Posts: 2135
Joined: Fri Jul 15, 2011 3:10 pm
Location: Mendon, MA

Re: Sulfur yellow 76: Megasquirted with tbi

#14

Post by Toehead »

Got the board back and am back in business.

I'm currently having fuel pump issues: Even though my fuel tank is clean (when viewed with a flashlight), the fuel return seems to be powerwashing the inside of the tanks of every bit of crud that has accumulated since 1976. I keep clogging my fuel filters. This was not an issue with the relatively low flowrates of the carb pump.
2012 Golf TDI, fast and frugal oil burner
1980 CX500C, All around road warrior (Sold)
1975 TS125 (Sold), old smoker
1977 naked GL1000, Highway cruiser
'81 GL1100 14,000 (reconditioned and sold)
'81 GL1100 50,000 miles (under construction)
2X 1981 CM400 beginner bike (sold)
1980 CB750C (sold)
1994 Virago 750 (Wifey's bike)
'76 GL1000 Sulphur Yellow (Megasquirted efi build) http://www.ngwclub.com/forum/viewtopic.php?f=47&t=59774
User avatar
wingrider
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Re: Sulfur yellow 76: Megasquirted with tbi

#15

Post by wingrider »

how much pressure is that fuel pump putting out?
2002 1800 Wing
2001 Valkyrie Interstate
1978 1200 EFI Wing with Motorvation Coupe Royale sidecar
1977 1200 Wing cafe/bobber project
1974 Suzuki GT550
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