Converted my GL1100 to fuel injection a couple of weeks ago, and thought I would share some info about it. Have done many efi conversions over the last 15 years or so on cars, but this was my first bike conversion. Been using it for errands around town, and have put about 50 miles on it, been running well.
Right now it uses the stock ignition, with the ecu controlling fuel only. Total cash outlay was about $300, not including the ecu.
Here's a quick description and some pictures of what was done:
The original carbs and manifolds have been replaced with manifolds and throttle bodies from a 1985 Honda GL1200 LTD. Bought on ebay for $150 incl shipping, which seems to be about average for a complete unit. It basically comes with everything needed except sensors, fuel pump and ecu. The throttle body/manifolds need to be modified to fit the GL1100 in 2 main ways; need to take out about 10mm of overall width (JBWeld), and port match the manifolds to the heads by about 2mm.
The stock Honda tps sensor was used. The map sensor is a standard GM unit connected to the stock manifolds with equal length tubes and t fittings. The stock reed valves and air injection units are gone and the idle air tubes routed to a Ford IAC motor. The stock injectors are low impedance, so need a stock Honda ballast resistor, or use 4, 10 ohm 10watt resistors from Radio Shack ($1 each). The coolant temp sensor is a VDO 323-057 using a m18x1.5 adapter ($25 for both), mounted in place of the fan switch, which is now controlled by the ecu.
The fuel pump needs to put out 40psi at 10 gal/hr (3 bar at 40 litres/hr), which is pretty small compared to the average car so just about anything from the junk yard should work. Mounted a new ebay $35 unit in-tank, which is probably the hardest way to do it, but its very quiet and takes up less space. Pump is a typical car 30 gal/hr at 5 amps, so using a smaller 36w bulb in the headlight to compensate, mainly to allow some battery charging at idle.
A megasquirt unit should work. I'm using a modified Edelbrock/Weber Pro-Flo, configured to do sequential injection. Have tried batch injection (megasquirt method) and it basically runs the same although idle quality is marginally better with sequential.
I'm using my standard tune for a small block Chevy with cam duration 220I/230E(.05), reduced for cylinder size. It's very close according to the O2 sensor. Have not put it on a dyno yet.
That's about it, hopefully didn't forget to mention anything major.
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Last edited by socrace
on Sat Aug 05, 2017 4:05 pm, edited 3 times in total.
1981 Goldwing Standard - efi'd
, other stuff