RPM Fuel Injection System

[racerrad8]

Okay it has been mentioned a couple of times since the WCR but there has been nothing official until now

Speaking of the FJR fuel injection set up,  not much has been said about that.  I was pretty impressed.  Standing by for more updates  .
George

I have designed an electronic fuel injection system for the FJ.

It is not a FJR system. Everything else from the intake manifolds, fuel pump, ignition system and all the way down to throttle cables are specific items for this application.

The system ran almost flawlessly at the WCR and I was truly impressed with the system and it was a lot of fun to ride. We got the bike running the Thursday before the WCR and even with a really rough tune, it performed better than any set of BS36 Mikuni carbs because when you twist the grip you don't have to wait for fuel to draw from the emulsion tube, the fuel is there and the bike is pulling hard.

Since the FJ is air cooled, we have tried several different ways of reading the engine temp and finally decided the oil temp was the best way compared to trying to mount senders in fins of the head. The only problem I experience at the WCR with the EFI on my 86 was since the temp sensor is for "coolant" it does like temps above 225* and then the ECU goes into a "limp mode" to not burn up the engine. So, once the oil temps got to the 235* mark the engine ran poorly, but it did not leave me stranded and I was able to get back to camp.

Software changes are already completed and it has been running great since then.

So far there are no modifications required of the fuel tank, side panels or anything else to have the system installed. That was the first task, make it fit without having to modify the bike and that was successful. So, after that we started  making the system run and that is the point we are now.

I am data logging all of the rides at this point with adjustments to tune being made to improve the system. This will continue until I am happy with the system in regard to performance and economy. I am working with a tuner specialist that is very sharp. He is the same guy who tuned my sons Miata to make just south of 400 wheel horsepower from a 1600cc engine.

The goal is to make the RPM EFI kit a plug & play system that can be installed onto an FJ with a minimal of modifications required to complete the install. There are things that will have to be done, like welding in a bung for the oxygen sensor in the exhaust, wiring and plumbing but that will be covered completely if the kit does become available.

I have to thank a couple of other FJ owners who have used their skills to get us to this point of the RPM EFI system. Without guys like Chris Wyatt and Dan Thiede, who both own and ride FJ's, I would not be to the point of development I am with the RPM EFI system.

I have no estimated time of release or even a cost point at this time. So far we are more than a year into this project at this point and until I am fully confident in all aspects of the system it will not be available for sale.

I will post more as information becomes available, but the posts will be few & far between as there are still hundreds, if not thousands of hours & miles of testing & tuning required.

Next time I have the tank off I will shoot a couple of pictures.

Randy - RPM

[giantkiller]

Yes!yes!yes!  I'm sure you'll have a map for the 1350s

[aviationfred]

 And to top it off, there would be someone who claims that a FJ actually is fuel injected!  I have it on good authority that EFI on the FJ ''cannot be done...!'' for many have tried in vain.  Let us pray it is possible & who knows, perhaps the concept will give legs to the FJ for the next thirty years... Grabbed from Mike Ramos's eloquent prose.

Fred

[racerrad8]

Yes!yes!yes!  I'm sure you'll have a map for the 1350s

Yep, that will be on the list.

Randy - RPM

[Steve_in_Florida]

 FUEL INJECTION PORN!!!    

[simi_ed]

Good news!  Maybe this is a solution for my ignition woes ...

[FJ_Hooligan]

Is that a Colder coupling on the fuel line?  It looks like one of their plastic ones.  They make them in SS with Viton seals for not much more money.  Much better for the under tank environment.

Very nice work on the FI!!!!  Let me know if you need extra "testers."

[racerrad8]

Is that a Colder coupling on the fuel line?  It looks like one of their plastic ones.  They make them in SS with Viton seals for not much more money.  Much better for the under tank environment.

Very nice work on the FI!!!!  Let me know if you need extra "testers."

I think it was a Motion Pro coupler, which might be the same brand just repacked. It is not going to be a requirement, we only did that because the tank has been on & off at least 100 times while trying to sort everything out and I did not want to break my petcock elbow loose by installing the hose that many times.

I will look into the metal unit as well just in case I decide it should be a requirement.

...the line is long for "testers" at this point as they are lined up from all around the world...

Randy - RPM

[JPaganel]

I wonder how adaptable this would be to other Yamaha inline fours...

There is a rather large number of XJ series bikes out there and I'm sure a bunch of their owners would like to give up carbs as well.

[racerrad8]

I wonder how adaptable this would be to other Yamaha inline fours...

There is a rather large number of XJ series bikes out there and I'm sure a bunch of their owners would like to give up carbs as well.

No very...

The intake manifolds for the FJ are exclusive to the FJ and will not work any other bike. There could be an opportunity to make intakes for anything, but my focus is for FJ's only if I can make it work.

Randy - RPM

[movenon]

Thanks for the update Randy.  This really is a leap forward for the FJ's.
George

[X-Ray]

Wow, That is truly remarkable. I would love to have an EFI FJ, it would take the level of "Moditis" into the stratosphere. The added benefits of EFI would be sensational on the FJ. 

[yamaha fj rider]

Randy thanks for the hard work and the update. Please keep us posted with the new developments.

Kurt

[Mark Olson]

that is badass Randy ,, seeing it in person was a treat.

the crowd around the efi fj was like a circle jerk.

[stua1959]

Circle jerk ? Not sure what that is exactly but we didnt have one at the Oz rally.