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AFIK, there has only been one successful EFI conversion to a gl1500, it was posted on this forum.

 

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Discussion Starter #22
The EFI project could lighten your wallet WERY much ! , - i vould go for the OEM GL1500 carburators .
Efi is soooooo much cheaper today. My last full standalone efi conversion job in my Vauxhall Viva cost me around say $750 NZD. That was using a $500NZD Megasquirt 2 ecu I built. This time round I'll be using a Speeduino ecu. I've started building it and if one is good at looking for deals on components you can build a working ecu for between $100-150NZD.
The most expensive one off purchase is a wideband controller for tuning, which are now available much cheaper from companies the likes of 14 point 7.
Most other parts used are just secondhand bits from various cars and bikes. I'll be on the look out for some small efi itbs to suit the tiny goldwing inlet ports. Otherwise I'll make or adapt something. Remember that this is a project I'm doing for fun with no urgency. We are now in a 4 week lockdown here in NZ so I have plenty of time in my workshop to use :)


AFIK, there has only been one successful EFI conversion to a gl1500, it was posted on this forum.

Thanks for the link- I'll check it out. Hopefully you'll see another succesful conversion soon :)

Update time- the engine is now being stripped down. Already its looking neater. I'll give the outside a good clean before I strip it further. A good sign is very little buildup and muck behind the valves suggesting a healthy low mileage engine. But time will tell. (I think the previous owner had bought a crash damaged bike and that was about 20 years ago!) I had seen videos of it running just before being pulled out and it sounded great.

There is so much that wil be removed/cutoff over the coming week once stripped. I shall weigh it today and then again once its at the point I want it- just a short height crank case and heads. Lots of fabrication to do after that!
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Sounds like you will have your work cut out for you. Please post your updates and photos as you go along. Sounds like an interesting project. I guess you could use the stock driveshaft output as a PTO for something, too.
 

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Discussion Starter #26
Well I'm doing my best to continue on with what steel/alloy and other bits I have in stock. Most places here are shut due to the lockdown so I'll just do the bits I can. Next step now that its in pieces is to machine up a hub and shrink fit it onto the crank flange, so helping the 8mm bolts there deal with torsional stress from a flywheel.

While I still had the Datsun engine removed from my imp due to it needing a new rear main seal and ring gear I took the chance to size the Goldwing engine place. It looks fantastic, sits really low and quite far forward while allowing for the subaru box...

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Been following the progress, that fits in there very nicely!

Just thought I'd chime in here since the thought occurred to me, as sometimes we "Overlook the Obvious". We've all done it at one time or another, myself included!

Does the Goldwing engine run in the same rotational direction (CW vs CCW) as the original engine? If not, you'll find yourself with a vehicle that has a single forward gear and four reverse speeds.... This, too, can be overcome but it would present additional project design challenges...
 

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Hi there. Yeah good question and one I'll get a lot.
Goldwing engines, like most pre 2000 Honda car engines, rotate anti-clockwise(counter - cw for you stateside folk) . Originally when I looked at the idea of fitting one a couple of years ago this fact put me off. I was to use either the imp transmission or a stronger vw box.
However, by taking a longitudinal transaxle from a front wheel drive car, in this case a very common subaru box, and turning it around 180 degrees it counteracts the anticlockwise rotation of the goldwing engine :)

Don't worry.. I've bench tested it just to be sure.

Also and very luckily the action of the subaru gear selection rod matches the imps gearstick action perfectly due to the fact that the two cars have differently opposed pivot points on their gear sticks. It would have been an easy fix but luckily I don't have to :)
 

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Well, sounds like you've already addressed the rotation question, the only other thing I can think of is transaxle lube. These don't have a pump, so no issue there, but since you'll be running it "Backward" (opposite of design rotation) there is the potential of lube issues. These run on splash lube, but lube will be flung in opposite directions from design. You might consider slightly overfilling the transaxle lube to help compensate....

Good Job! :) :)
 

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Hi there. Yeah good question and one I'll get a lot.
Goldwing engines, like most pre 2000 Honda car engines, rotate anti-clockwise(counter - cw for you stateside folk) . Originally when I looked at the idea of fitting one a couple of years ago this fact put me off. I was to use either the imp transmission or a stronger vw box.
However, by taking a longitudinal transaxle from a front wheel drive car, in this case a very common subaru box, and turning it around 180 degrees it counteracts the anticlockwise rotation of the goldwing engine :)
The rear engine VWs you could just change the differential from the left to the right. People did that to make mid engine buggys. They changed it so only one side came off sometime in the 70s.
 

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Discussion Starter #32
Well, sounds like you've already addressed the rotation question, the only other thing I can think of is transaxle lube. These don't have a pump, so no issue there, but since you'll be running it "Backward" (opposite of design rotation) there is the potential of lube issues. These run on splash lube, but lube will be flung in opposite directions from design. You might consider slightly overfilling the transaxle lube to help compensate....

Good Job! :) :)
Are you talking about the Subaru transaxle? Yeah I think it should be ok because the shafts run in the oil and it'll be getting thrown up all over the place in there :) A neat feature of these transmissions is that they have a dip stick as well- makes for quick easy check that the axle is up to the correct level . I could also certainly overfill it through the dip stick if I felt the need to .
 

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Big problem with running backwards is any thrust from the helical gears will be the oposite way to design and are there any thrust washers or other things to accomodate it
 

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Discussion Starter #34
Yeah that too crossed my mind. But I relaxed when I remembered that gearboxes do take loads in both directions. Think of a subaru towing a boat down a hill, engine braking all the way (subarus are hugely popular here in nz as capable tow cars)

Whereas this is a 750kg imp with hopefully 100bhp. so I'll risk it :)
 

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True, but designers work on you driving forwards for a high percentage of the time and a loaded trailer downhill only reverses thrust on the diff, the gears thrust is from the tooth shape and stays same as long as rotation same. Chances are knowing the Japanese designers you will be fine, its just something to consider and keep half an ear out for.
Is this going to be an all the time car or a fun weekend car?
 

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If any issues crop up sounds like Subaru transaxles are in good supply....... :D

Since that's a front wheel drive axle in the rear of the car, if you could work out steering linkages to the front wheels of the car you could get crazy-tight turning radiuses!! :D
 

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Discussion Starter #37
Its our daily. Not that we commute because we run our own little engineering business from home. So its sort of a shopping car/fun car :)

I could fit a 4wd subaru box and run it through to the front and make a 4wd imp...

An 'Imp 959' :)
 

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Now that would be a crazy imp, a very badly built car due to where the government insisted the factory went. On Sky there is a program called Car SOS and they just done an imp really well, from my area as well.
 

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Discussion Starter #39
Ahhh yeah- funny you should mention that. We watched it yesterday.
The Imp they restore is much like my wife Hannah's first classic car , a 1974 Imp super painted in Prairie wind. A little car we enjoyed immensely and what made me always want another...

 

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Glad you found it, just went looking and we get it on National Geographic it was series 8 episode 3. Lots of new panels available here!
Best of luck with the conversion i have just totally rewired my mates 1500 trike, what a job, bought the electrical manual to do it. Email me direct to [email protected] if you need any pages scanned.
Best of luck
 
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