Setup help: Walbro Bike400 Cam Ref for sequential injection

[Jim bob]

Hello,

I am trying to set up a bike400 ecu using a 30-2 wheel and cam ref. I understand that the Walbro ecus do not care where the cam ref is as long as its not over the missing teeth. Problem is that the cam ref identifies TDC of compression stroke. There seems to be nothing in the set up software (gentab3) that identifies it does this or where to put the cam ref so that is knows that TDC of compression is coming next.

thanks

[Jim bob]

Hello,

I am trying to set up a bike400 ecu using a 30-2 wheel and cam ref. I understand that the Walbro ecus do not care where the cam ref is as long as its not over the missing teeth. Problem is that the cam ref identifies TDC of compression stroke. There seems to be nothing in the set up software (gentab3) that identifies it does this or where to put the cam ref so that is knows that TDC of compression is coming next.

thanks

[Dan Deussen @ Weber Motor]

The Walbro setup is as following:

TDC of a cylinder is defined by the trailing edge of the tooth counted after the -2 gap.

When using a system without cam reference you have esentially tooth 1 through 30 you can use as the TDC mark (its recommended not to use 29 and 30 as they are essentially the missing ones).

When using a system with cam reference you have esentially tooth 1 through 60 (two revs of the 30-2 wheel) you can use as the TDC mark (its recommended not to use 29, 30, 59 and 60 as they are essentially the missing ones).

I would also always set it up so none of the calculated events (ignition event, injection event) fall into the gap of the missing teeth. This means that for example cylinder 1 TDC should not be on tooth 1. Maybe set cyl 1 to tooth 10 and go from there.

If you have any further questions, please don't hesitate to ask.

[Jim bob]

Ok, thank you. That makes sense. I have cyl 1 firing on tooth 21. As the firing order is 1 3 4 2, would I set TDC cyl 1 as firing on 21 then cyl 3 on 37 and cyl 4 on 51 and cyl 2 on 7?

That would make sense to me but I still need to know where to put the cam reference. Do I put it before TDC cyl 1? So it sees the cam ref and knows that, that is the beginning of the order? The ecu still needs to know if its on the 1 to 30 tooth rotation or the 31 to 60 tooth rotation. It would use the cam ref to know this so I guess the question is which rotation of the crank sensor do I include the cam ref. On the 1 to 30 tooth rotation or the 31 to 60 tooth rotation?

thanks again http://fsae.com/groupee_common/emoticons/icon_smile.gif

[Dan Deussen @ Weber Motor]

Jim,

I don't exatly recall how the cam sync related to the count of 1-31 or 31-60. Just put the sync signal anywhere and try one setup and if the engine does not start, just swap the values for TDC's 1-4 and 2-3. It should then work.

If you want you can send me your initial map file and I can look over it and make sure all your settings are plausible. dsdeusse-at-yahoo-dot-com (of coure without the -'s and with @ for at and . for dot)

Just out of curiosity, what engine is that you have that fires 1342?

[Jim bob]

Ok, I'll give that a go. Easy enough to reverse the TDC's around http://fsae.com/groupee_common/emoticons/icon_smile.gif

Another problem I'm having. Haven't begun tuning yet. All the planes when opened say

Max<=Min! and do not display. No idea why. Haven't looked too far into it but maybe you can give me a heads up before I start scratching my head. Could be something simple though.

Engine is a Mazda B6T

[Dan Deussen @ Weber Motor]

You need to set up all the breakpoints (rpm and load steps) in the tables first. Like I said, try doing a basic map layout and then send it to me and I will look it over.

[Jim bob]

Howdy, sorted the breakpoints but I have another problem now.

For some reason the ecu does not like my cam sync. When I crank the rpms and ERcounter start counting. rpm reads then stops then ERcounter gets to 1 then resets. At same time rpms just read zero. Continous cranking sees ERcounter go 1, 0, 1, 0, 1, 0 and rpm do nothing
I am using Mode 1 30-2 plus cam ref.

It may be a timing issue or it may be something I have done. If I change to a crank signal only mode the rpm reads fine so I know its a problem with the cam ref or a sync issue.
Now the cam ref is actually a hall effect pickup. I have put a 10uF bi-polar cap in the line to cause the hall input to go negative on the falling edge. I have checked this with a scope and its ok. I am using a 12v input to the hall effect. I have also checked the output of the lm1815 inside the ecu. It is reading ok, so I believe its accepting the signal. Has a 0-5volt square output. Maybe a sync issue? Is there some way the Walbro unit can tell me if its a sync problem?

thanks

[Jim bob]

Ok, I think I may have found the problem but I'm not sure how to solve it.

Its a sync problem because the crank trigger seems to have noise. When using the flywheel type 0 (crank only missing 2) the rpms are not accurate and jump a little. I am guessing this is causing the ecu to error because it lost sync with the cam on mode 1 so it resets. This would explain the 1, 0, 1, 0 thing its doing. Resetting when it loses sync.

Any idea how to get rid of the noise? All wires are shielded to the sensors. Maybe I could try a cap?

[Dan Deussen @ Weber Motor]

Jim,

I belive you analyzed the problem correctly and your input of the cam sync is not working correctly. If you plan to use a hall sensor on the cam, removing the LM1815 is the best solution. Somehere I have a set of instructions on what other changes are necessary to make the same input work as a hall. Give me your e-mail address and I will send it to you as soon as I find it.

[Jim bob]

PM sent http://fsae.com/groupee_common/emoticons/icon_smile.gif

[Jim bob]

Dan,

Were you going to send that info on? I could really do with it. Nice website you have too.

thanks

[Dan Deussen @ Weber Motor]

Hey Jim,

I looked and I had sent the instructions as an e-mail from my old work account. I will contact the guy I had sent it to and see if he can send it back to me now. I'll send it to you as soon as I have it.

[Jim bob]

Dan,

I know this is an old topic but I have sent you a reply email to the address you sent me this info from. I had some more questions relating to using QSENG in mode 4 (trigger on camshaft minus 2 teeth)

I now wish to use this for sequential injection. It is optical triggering.

I am to modify the minJ400 board to hall effect and I am wondering if the pull up used in this modification will be sufficient with a 1v peak square wave.

I also need to know which edge the minJ400 triggers on. The square wave signal I have is a falling edge trigger signal.

thanks

[Dan Deussen @ Weber Motor]

Jimbob,

got your email. Forwarded it on to a Walbro software engineer. He should have an answer in a few days I hope.

[rjwoods77]

Hey Dan,

Just on an off note do you know the flow rating on that pump that comes with the FSAE walbro setup I bought?