Simmy's Naked Turbo Project

thanks @Polock I saw those, they do specify the correct range.
Would be nice to see their physical dimensions.
$175 bucks!

 

found a drawing.
https://www.jegs.com/InstallationInstructions/0/083/083-525series.pdf

this could probably fit under the carbs on the RH side next to the starter motor.

 

the more narrow reading pressure gauge arrived.
The good news is the fuel pressure regulator is holding the pressure exactly where it needs to be, 2.8 psi.
The next plan is to strip the innards from the check valve and see how it runs any better.

 

@ManBot13 you were spot on with this.
I first took the check valve apart 2 months ago to inspect it when I read your reply.
I had just rebuilt it with a new o-ring so I assumed it was functioning properly, pretty simple device right.
I spent about 1/2 an hour in the garage today with the mercury stick and it was running and idling perfect.
I took it around the block and after a couple laps it started sputtering again.
I limped back home and just made it into the garage on 2 cylinders.
I was beyond disappointed, it was running so good for about 10 minutes.
I completely removed the innards from the check valve.
BINGO! The bike is running perfectly. Absolutely perfect, like as in absolutely no issues.
I headed out on the expressway and had a good straight section at speed.
I haven't actually set the boost controller yet, I set the spring preload what I thought was a soft setting but I read 14 psi on the boost gauge today. The cheap gauge bounces all over but once it pressures up to 10 psi the needle becomes solid and steady and it climbs pretty quick to 14 psi. I went for another spin with a buddy on his GSF1250 so I got a few more opportunities to crank it up. The boost controller is definitely set at 14 psi as that was the limit today. Even that is crazy illegal but man is it intoxicating, you just want to keep accelerating. I need to play with the boost controller a bit, see if I can adjust it lower and get the proper feedback on the gauge before going over 14. Its possible the wastegate is staying closed and the BOV on the surge tank is limiting things, but as I said there is very little preload on the boost controller spring. I did slip a washer into the BOV so it should stay closed way beyond 14 psi as I think that's about where the OEM spring is set to open.
Now I can focus on getting it painted over the winter, and flipping the brake discs around, oops!
2021 is going to be fun as long as I see no tickets on this thing.
I'll be 60 in the spring. I had a brand new Seca Turbo in 1984 and almost lost my license then, I had a drawer full of tickets, cops then had a tendency to knock your ticket down to 15 kph over so you wouldn't see demerit points.
I worried about demerit points but my insurance company freaked out at the number of infractions.
I'm much more responsible today, age makes you much wiser for sure.

 

Super glad to help! That issue literally took me two years to diagnose, so you’re doing better than me!

 

Even with miss matched paint the bike looks good.

 

Thanks @lostboy I’m going to contact your body guy again and get the painting underway. It’s really running great, I’m so stoked.

 

Simmy, I just went a private message to you——-
Dfox

 

What color do you have in mind for it?

Tony

 

This has been a very well thought-through build

 

top secret for now. It will look like Yamaha did it.

thank you Sir, I would love to show it off at one of your carb clinics.

 

It would be GREAT!!!!!

 

Casually scrolling through this thread and I just had a blast of serotonin seeing these 4 engines lined up and a nice laugh "R&D labs" awesome lol

 

Hey @Simmy , question for you - where did yamaha hide the turbo? Is it directly underneath the swingarm pivots?
The 900F framy project has a surprisingly roomy space here, and also another above the pivot points, although this would rob some of the battery/ecu/charge-cooler space. This is the problem with these kinds of projects, the edges keep shifting. I have a 650 turbo engine, so could mount it high or low really, assuming I want to double the size of the project...

 

This shows it behind the collector https://www.yamahapartshouse.com/oemparts/a/yam/50042383f8700209bc787a70/exhaust

 

Thanks. That's interesting - looks like they used ane muffler for the turbine outlet and one for the waste-gate

 

Not sure about that. Look at where the bolt #14 lines up with the exhaust flange and something hidden on the turbo. Perhaps a more detailed set of pictures of that turbo would answer questions.

 

Confirmed - from the write up @Simmy posted up from back in the day.
https://badcurator.org/resources/Magazines/CG_Sep82/Yamaha-XJ650-Turbo.pdf

 

Hi @Minimutly if you go back to Page 9 in this thread I took a shot of the turbo installed without the swingarm in the way.
I showed the comparison to the standard 650 frame, the centre stand pedestals are too tightly spaced to accommodate it.
I'm not sure how the 900 frame compares.
The biggest problem with mounting the turbo here is it becomes the lowest point in the oil circuit.
Yamaha installed a check valve in the oil line to the turbo to prevent oil from flooding it.
Some have found this defective, mine was working, however I found the scavenge line was leaking oil back into the turbo unit.
I believe the swiping surfaces in the pump itself leak and allow the oil to seep. This is why I installed another check valve in the scavenge line.