Fuel injection for vfr

Would you do it?

Where can you get a kit?

 

HUH???????

 

fuel injection, you kno, when the fuel is injected.


non carbourated.

 

Buy a 5th or 6th gen......will be cheaper and easier in the end.Gen 6 comes with a factory trailer hitch as well.:biggrin:

 

do i sence a bit of sarcasm there.

that said, i met a msf coach today that has a 600-700 lb bike that is going to buid a hitch like mine and tow some dirt bikes.

 

Check out Megasquirt. When I get a couple of dimes to rub togther I'm going to build an FI system for one of my VF's using that. I'd love to do that over this off-season, but as usual the projects are already stacking up.

 

What bike will it be done to?

iv got a gen 3

 

If you check out Megasquirt you'll find that it's a generic DIY fuel injection ECU. It was initially intended for cars (muscle cars, specifically) but people have used them on everything. There have been lots of bike applications done. You need to fab the rest of the system including the injectors and fuel pump, etc, etc. so it's not plug and play or anything.

I'll probably use one of my 500's to start with. Once it's figured out I'll be able to easily adapt it to any of the others. I really want to make it work on my 1000R.

 

sounds like a job.

screw it. ur gettin my gen2 cause i dont want to work on them remember

 

Understood. Yes, it will be a lot of work, but I'm a glutton like that.

 

Would be worth the money, but I have more important places to put cash for the next few months

 

Why mess with a custom fuel system ?? Too complex, to expensive.

There's absolutely NOTHING at all wrong with stock carbs !!!!!!!!!!!!

With enough work and money you might substitute for stock carbs but you couldn't muchimprove on them

EVEN factory FI systems have smoothness problems (jerky throttle ) at low speed, not with good carbs, and you're NOT a factory !

 

Fuel injection is more efficient. woudl get better gas mileage. more power.

mainly gas mileage. since i ride sometimes 300 miles a day i need it.

 

Don't forget that it's also a lot easier and faster to tune!!

 

GFAR, i'd say stick with your carbs unless you have the money and time to do it other than that i'd just buy a FI bike instead

 

i dont see why any engine bigger than a lawn mower uses a carb. injection is clearly better.

 

Having worked fairly extensively with both FI and carburation...I don't really look at one as better than the other. They both 'have their days'.

If Honda had decided to use FI on the VF500F when it came out, I doubt there'd be any left on the road. Of the few FI bikes in that era..how many do you see on the road? Besides, the FI of that time was totally crude compared to what's used now. Just try and buy PGM-FI parts for a GL1200L, and that's if you can find anybody who's willing to even work on them. On the other hand you'll find all sorts who are glad to clean the carbs on your normal GL1200.

One thing about FI from a repair guy's angle...a good self diagnostic feature saves a ton of time should anything go wrong.

 

Fi

Jamie,

Let me know how it goes. I have the FI setup from a 2000 VFR, which I am told would be able to handle the KR. All I really need to know is how to adapt the system to the KR and I'm ready to put it on my RC project, as soon I can get back to working on it.

Larry

 

Holy old thread resurrection, Batman!! I was curious as to whether anything ever came of this idea, and if anybody ever managed to fab up an EFI setup for these old 2nd gen VFRs, and if so, what in the world would it take?

 

I know of a guy who is currently finishing up an FI conversion on a VFR400 (NC30). He has a blog where he shows some of his work and results. He's using a Microsquirt ECU which is the small version of the Megasquirt.

He's very good with math, computer programing, computer hardware, he welds and he does his own machining of metal parts on a computer controlled machine he set up in his garage.

Right now he's fine-tuning the fueling strategy, he's essentially imitating what Honda did on the VFR800. On the VFR800 the Honda PGM-FI system uses Manifold Absolute Pressure as the primary fueling parameter when the engine is at idle speed up to about 2/3 throttle. At throttle openings above 2/3 and on up to full wide open Honda PGM-FI uses the Throttle Position Sensor reading as the primary fueling parameter. Honda does this because at high RPM the Manifold Absolute Pressure signal (taken at the airbox) becomes unreliable due to resonance issues (caused by the large valve overlap).

So the answer is, yes, somebody could set up an FI system on an older VFR. It's not a task for everybody.

I've done two carb-to-FI conversions, a 2005 Kawasaki EX250 and a 1993 Suzuki GSF400.

You have to be willing and able to think up, fabricate and then implement some creative stuff while keeping the build quality up to high standards (because you'll be the one riding it).

You have to be able to put together stuff like this: This is me converting my 1993 Suzuki GSF400 to FI, making the bike's rack of 4 Mikuni BST32 carbs into an individual throttle body fuel injection array by closing off all the unneeded carburetor fuel passages, adding a Throttle Position Sensor from a Triumph Speed Triple and adding the injectors and fuel delivery plumbing from the airbox injector array off a Ninja ZX6R.

























And all that work pictured above is just scratching the surface of the effort required. The guy doing the VFR400 conversion has had to work through much more complex issues due to the V-4 engine.