rx8 trigger wheel question
 

ok i got the rx8 trigger wheel to work on my car but I'm having a few issues…the set up is s5 13b using fc coils and rx8 trigger wheel and on the megasquirt is set up for trigger wheel and i have 3 spark out puts. the problem is that I'm not getting the trailing coils to work but the leading is working fine and the car drives smooth and idles perfect. on tunnerstudio i have the rotary settings set to fc should i change it to fd or rx8 since I'm using the rx8 wheel. thanks

The wheel setting is independent of the spark outputs. Setting RX8 wheel should work with any engine and ignition configuration.

The problem you are having is most likely related to wiring or similar.

Ken

ok i have it wired as follows d14 to ign spark output A pin 36 on the leading coil d16 to IAC2B output B pin 31 to red wire on the trailing coil IGT and d15 to IAC2A spark out put C pin 29 white wire on the trailing coil select

settings at the megasquirt
is 36-2-2-2
65 trigger offset
going low
rising edge
fc mode

also all my leds are fully on… i installed a sparks tester to the spark plug wire and i can see a really tiny spark when i close the gap really close but is really weak

no one else here can help

Are you certain that the coils themselves and the ignitor are in good shape?

Ken

i swap coils twice but i can try a 3rd set it might be that my coils were bad from the get go.. how can i test them

Can some one guide me on the right direction on how to test trailing coils. Thanks

That information should be in the factory service manual for the car those coils came from.

Ken

What those the LED's should be doing while cranking and idling

The left and right LEDs should very briefly blink during crank. The middle LED should very visibly blink during crank. At idle the left and right LEDs should just be dimly lit and the middle should blink. The middle LED should be wired to coil select on the trailing ignitor, the right LED should go to trailing IGt.

Ken

All my LED's during idle are solid on and during crank the left one blinks and the other two are solid on. I do have it wired that way. I'm stuck I tried every thing with no good results

Sounds like you don't have trailing ignition turned on, or you are using a firmware where it doesn't work.

Have you ever posted your msq?

Ken

were do you turn trailing ignition on? and i will post my msq here in a bit

im also using 3.1.0 ms2 extra

here is my MSQ

Should I try rebooting the software an also if I have 1k resistors on the LEDs for the spark outputs would it be a problem

I've not had a chance to look at your msq or try it on the bench. I'll try to get to that in the next day or two and let you know what I find with that firmware.

It might just be that trailing is broken in that firmware.

Ken

Ok thanks

Problems in the msq:

Trigger Angle/Offset should be 0.
You're using far too much cranking advance. That should be closer to 0 degrees.
Your maximum dwell duration is probably getting close to the current limit. Try something closer to 2.6-3 ms
Did you turn on the noise filter on purpose? It should not be used unless you actually need it.
Your staged injection table is going to stage at anything above 75 kPa regardless of RPM. Is that what you intended?
Your idle advance settings are probably going to give you idle advance when you don't want it.

My recommendation is to get everything working correctly, then start turning on the more advanced features like idle advance.

None of the problems I found above should explain why you don't have trailing ignition, and I vaguely remember someone saying that the 3.1.0 firmware had a bug that kept trailing from working, so I'd try the latest stable firmware which is ms2/extra 3.2.1.

Ken

thanks man i will try all this tomorrow

ken i tried the new firmware and its still doing the same thing..the LED,s are still doing the same and still no trailing. i also fix those other setting you said . what else can i try

It's there a place on tunner studio that you can set the spark output

Everything you had set in your msq as far as spark outputs looked fine.

I'll test on the bench and see if it's working later. If it is working, it's likely that you made an error modding your board or wiring to the trailing ignitor.

Ken

Do I have to use 4.7 k resistors cause I'm using 1k. Should I swap pin 31 and pin 29 and if it works cause now I have pin 29 on the white wire and pin 31 on the red wire on the igniter

i swap the wires around and still not working so i thing something is wrong with the MS. if i had the setting for the coil driver going high would that had a chance to fry my igniter. cause on my first tune i had it set on going high.

Ken i also did a test on output B and output C with a multimeter and both outputs are showing 0.37 while I'm cranking the motor. would that tell you something.

i just check with a multimeter set to DCV on spark output A signal during cranking which is working and I'm getting 0.475 and also notice that the signal was constally changing but on spark b and c it just goes up to 0.035 and stays. by the way output A is the only one working on the car. could that be an indication of my outputs been bad.

You guys aren't really using a trigger angle of zero are you?
Having an ignition event about the same time as a trigger event is very very bad juju.
Notice that trigger angles are always between 50-90*? =)

The RX8 wheel decoder has a built-in "trigger angle" so the user doesn't set it.

Also, the ms2/extra and ms3 code do not actually "trigger" on the tooth the angle is set for. In our code on more generic (not special like on the rx8 wheel) you set the tooth #1 angle and it calculates everythig else for you. We also don't trigger from that tooth so that angle can be just about anwhere you want. We use every tooth on the wheel to schedule timing instead.

Ken

Ken any input on what i posted

So is the sensor mounted in the same position as an RX8?

If not you have to specify trigger angle (I assume this is the tooth #1 angle you're talking about?)

If the trigger angle is 0 that means it is syncing @ TDC which is when the accel is highest (generally)
Please correct me if I'm misunderstanding your post.

im gonna take the megasquirt out and look at it internally again i prob send it to DIY to trouble shoot

You are misunderstanding it. We do not have "trigger angles" the way you are thinking about them. The tooth #1 angle on generic (like 36-1) wheels is used automatically to trigger off of *every tooth*. The RX8 wheel essentially has a preset tooth #1 angle but is otherwise the same. It doesn't matter what angle tooth #1 is set to because we use all the teeth to schedule timing.

As far as syncing to the wheel, we have a special decoder for that wheel which determines from all three missing teeth when to sync.

Ken

I just noticed that your TPS is calibrated backwards. I don't necessarily think that this is causing your issue with trailing, but it could be causing you other issues.

Ken

This appears to be a firmware bug. I'll have to fix it.

Ken

I have found and fixed the bug. Please PM me your email address and I'll send it to you. It will be included in the 3.2.2 firmware.

Ken

Is this bug for the trailing problem

Correct, it is the only bug I know about. Also, like I said before, your TPS is calibrated backwards, this can cause problems.

i will fix the tps ..the reason the tps is backwards is because its a 3rd gen tps moded to be use on an fc and the throttle opens backwards on the FC but all i have to do is switch the ground and the 5 volt wires…ken some how i can find no firmware on that directory

Ken its fix problem solve i have trailing you are the man. i wound be able to change the fps until i change the throttle body. thanks

What problems could the tps calibrated backwards cause

I would have to test to be sure but it can cause TPS to do weird things when it goes slightly outside the calibrated range.

Ken

Any info

I have not had a chance to check yet.

Hey ken don't worry about the Tps Im in the process of swapping an fd upper on my s5 and the Tps should be calibrated the right way after that. Thank for all the help

ken so let me get this right. you are saying that for the rx8 36-2-2-2 it does matter were the VR sensor gets mounted the code its written to pick it up any were?

No, for that wheel it matters. That wheel is found on the RX8 and some subaru engines. I will have to check but I think we allow a limited amount of offset, but since this wheel is not considered a "generic" wheel you should try to get the sensor position relative to the wheel and eshaft to the same as an rx8.

Ken

^This is the situation we were referring to earlier.