RZ350 2-stroke trigger configuration questions

[sweet_baby_james]

I have a 1985 Yamaha RZ350, 350cc 2-cylinder 2-stroke motorcycle, that I am converting to EFI. I have made good progress getting my Microsquirt wired up with all the sensors, running MSExtra 3.3.2. I am starting to do the configuration in TunerStudio; all the sensors seem to be reading correctly, MAP, IAT, CLT, TPS. I havent hooked up the fuel pump just yet though. Using R6 throttle bodies with 230cc/min injectors.

For now, I am using the MS for fuel only, keeping the stock ignition. The ignition system has two triggers on the flywheel and a single VR sensor. It gives two ignition events per rev (obviously this is a two-cylinder two-stroke so that is necessary, 180deg apart). It is wasted spark. In TunerStudio, I am planning on setting up to use '2 Squirts Alternating'.

My question is, how do I tell TunerStudio what the configuration of the ignition triggering system is (ie. two triggers = one rev)? The only place that I can see option like this is under the 'Ignition Settings' >> 'Ignition Options/Wheel Decoder' page. Do these setting also apply to injection as well as ignition (which i am not using)? If so, what other settings on this page will affect the injection timing, if any?

Thanks

James

[dontz125]

For a situation like this, with two 180* teeth and one VR, I would say there isn't much difference between calling it a 2-0 wheel and Basic Trigger.


Edit - Actually, I don't think you can use a toothed wheel without a missing tooth OR a cam signal, so Basic Trigger is what you'll need. And yes, you can use control both injection and spark with that; you'll need to determine your trigger angle for ignition.

[sweet_baby_james]

Ok, great, thanks for your response. Does the ignition table (spark advance) also affect the injection timing?

[jsmcortina]

No. The injection timing table is used for that.

James

[sweet_baby_james]

Thanks James. That was my initial thought but that option is greyed out in TunerStudio.

[jsmcortina]

Sequential injection is only available with certain input trigger arrangements that provide enough information for the ECU to run sequential. Typically this is a missing tooth wheel on the crank. (4 stroke engines want a cam sensor also.)

James

[sweet_baby_james]

Ok, so with my triggering setup I would use 1 squirt Simultaneous?

I'm still a little unclear as to how the controller know that it will see 2 trigger events for one crank rev. And if I use 1 squirt simultaneous, how does it know NOT to inject when it sees the 2nd trigger event. Does it know that based on the fact that I select '2-stoke', '2-cylinder' and 'Even Fire'?

[jsmcortina]

Does it know that based on the fact that I select '2-stoke', '2-cylinder' and 'Even Fire'?

Yes, that's the idea.

James

[sweet_baby_james]

ok, so I was just over thinking things I guess! Still have the injection timing table greyed out though. :/

[racingmini_mtl]

You can't use sequential injection with the setup you have. So the table will remain greyed out.

Jean

[sweet_baby_james]

I changed to simultaneous and still have it grayed out.

[jsmcortina]

This is why:

Sequential injection is only available with certain input trigger arrangements that provide enough information for the ECU to run sequential. Typically this is a missing tooth wheel on the crank. (4 stroke engines want a cam sensor also.)

James

[sweet_baby_james]

Got it. So the injection timing is fixed with my existing setup.

I should probably look into getting an additional flywheel and mounting a 36-1 wheel to it. That would mean I have to use the MS for ignition and fuel. New coils required for that I guess.

[magaiverbrasil]

I would like see videos for this machine run megasquirted ! i love yamaha rd350 lc !

[sweet_baby_james]

Here's a link to a short video on my Instagram. Bike has Microsquirt controlling fuel and ignition at the moment. I have also got it wired to control turbo boost pressure but that needs tuning first.

https://instagram.com/p/-NjPDkvgxI/

[DaveBridges]

Hi James, I know this is an old post but I am heading down the same route as you by fitting a microsquirt to a RD350 YPVS. The question is have is how did you connect the VR up? I have followed a really old post by a guy called Steve Murphy but he was using a Mini-MS, He mentions using a HEI four pin module but in the Microsquirt 3.4 manual it says to use 7 or 8 pin. I have also been told I can connect the VR1IN+ & VR1IN- diectly to the pick up on the flywheel.

If you could point me in the right direction then I would really appreciate it.

Dave

[DLRacing]

I have a 1985 Yamaha RZ350, 350cc 2-cylinder 2-stroke motorcycle, that I am converting to EFI. I have made good progress getting my Microsquirt wired up with all the sensors, running MSExtra 3.3.2. I am starting to do the configuration in TunerStudio; all the sensors seem to be reading correctly, MAP, IAT, CLT, TPS. I havent hooked up the fuel pump just yet though. Using R6 throttle bodies with 230cc/min injectors.

For now, I am using the MS for fuel only, keeping the stock ignition. The ignition system has two triggers on the flywheel and a single VR sensor. It gives two ignition events per rev (obviously this is a two-cylinder two-stroke so that is necessary, 180deg apart). It is wasted spark. In TunerStudio, I am planning on setting up to use '2 Squirts Alternating'.

My question is, how do I tell TunerStudio what the configuration of the ignition triggering system is (ie. two triggers = one rev)? The only place that I can see option like this is under the 'Ignition Settings' >> 'Ignition Options/Wheel Decoder' page. Do these setting also apply to injection as well as ignition (which i am not using)? If so, what other settings on this page will affect the injection timing, if any?

Those are cool bikes. I still have mine, a 1984, the 112'th one built, according to the serial #.

Thanks

James

[whittlebeast]

You will be shocked how big the injectors need to be on a two stroke. I ended up at two 800 cc injectors to feed a 800 cc motor at 7300 rpm. It has to do with you have twice as many injector openings and closings per engine revolution compare to the more common 4 stroke install.

Andy

[Nath88]

I welded a 20-1 trigger wheel to my stock YZ250 ignition rotor and am using a second pickup coil (from a YFM350) just for the Microsquirt. If you want to do ignition timing I'd probably recommend going that way.

However some have used the standard 'long tooth' type trigger setup with success:
http://74.124.198.224/~micro/viewtopic.php?t=23246
http://74.124.198.224/~micro/viewtopic.php?t=23076