E28 Megasquirt FAQ

Post by **Brad D.** » May 12, 2009 6:49 PM

Are you still getting sync dropouts or is it just breaking up at 1700. If it's just breaking up, it sounds like the problem that I had where I had the wrong spark output selected in Megatune and had my high current injector driver wired in wrong to D14.

alijonny · Post by **alijonny** » May 12, 2009 7:28 PM

at this point it is sync dropout, it is like a rev limiter. The injectors are cutting out as seen from the led in the MS box. It is marginally better as I made small adjustments to the two screws, but it does not seem to get any better than that with more adjustment. I have the spark output side selected to the js10 setting as opposed to the d14 side as the car would not even start in the other setting.

alijonny · Post by **alijonny** » May 12, 2009 8:40 PM

beamters, I hate to be clogging up the MS FAQ, should all this get transferred to a new thread?

alijonny · Post by **alijonny** » May 12, 2009 9:44 PM

I may have found more discrepancies with the pinout.
in the bentley manual:

engine speed input is pins 8 and 27 with 23 being the shield. (grey connector)

reference point input is pins 25 and 26 with 5 as ground and not shield.
(black connector)

the 35 pin(out) on page one shows pins 25 and 26 as the pulse engine speed (going to the VR sensor), but the shield wire/ground is on the grey connector. I am going to switch number 26 to number 27 and 25 to number 8 and plug in the black connector and see what happens. wish me luck!

Post by **Brad D.** » May 12, 2009 10:11 PM

The ETM I am looking at has 5 as the ground for the shield for the "reference point input", pins 25 and 26. I made a naming convention mistake, which I will correct, but the pinout is correct Both sensors have shielded wires, but the shields are grounded to different pins. While the ETM specifies pin 23 as a shield, all it needs is a ground, which is what pin 5 is. You could just as easily use 8 and 27 and ground the shield to pin 23. I just picked one.

alijonny · Post by **alijonny** » May 12, 2009 10:13 PM

when I checked the factory harness for resistance, the shielded wire was on the black connector and the yellow25 and black26 wires were on the grey connector.

edit: I see what you are saying. also, the car doesn't see to run much better... boo.

Post by **Brad D.** » May 12, 2009 10:20 PM

As long as the shield on the pair of wires you are using is grounded you should be fine. Either shield should have continuity to ground.

alijonny · Post by **alijonny** » May 12, 2009 10:38 PM

would a video help at this point?

FirstFives Dictator · Post by **FirstFives Dictator** » May 13, 2009 6:44 AM

If your running one of the latest MS2Extra firmware versions, you can use TunerStudio's tooth logger to check the time between teeth.

See my powerpoint for screenshots.

alijonny · Post by **alijonny** » May 13, 2009 12:41 PM

ok, I will check this tuner studio. I will also post a video for your enjoyment.

alijonny · Post by **alijonny** » May 13, 2009 2:59 PM

I must be magnetic or something, because now my f-ing camcorder isnt syncing with my computer!!!

alijonny · Post by **alijonny** » May 13, 2009 5:12 PM

update: got tunerstudio running, that's very nice. I looked at the tooth logger and it was a huge mess and not even uniform looking like the power point. Anyway, I hooked back up to the stim and notice I cannot take rpm above 1788rpm. HMM! same problem I am having when hooked up to the car.

so, I must have fried something or somehow got corrupted files for the download of MS2extra code.

any new suggestions?

Post by **Brad D.** » May 13, 2009 5:40 PM

I'd start by reflashing your firmware and reloading your .msq.

alijonny · Post by **alijonny** » May 13, 2009 11:17 PM

reflashed the firmware, erased/uninstalled and re-installed ms2extra 2.0.1 to the computer and MS box . I checked the rpm before entering the basic settings on page one and had a very nice and steady rpm thru the range. I installed the settings and checked and everything is now screwed up thru the rpm range. I tried changing wheel settings with positive results on the stim, but I know that isn't going to work on the actual car.

I am about to take a $400 loss in the form of a hammer to MS incident.

Post by **Brad D.** » May 14, 2009 12:09 AM

Keep at it, I had to convince Scott to not use his as a wheel chock.

alijonny · Post by **alijonny** » May 14, 2009 11:59 AM

I sent a message to diyautotune and wonder who else I may bother with this same message.

Hi, my name is...rain man... and I bought a Megasquirt v3.57 complete board within the last few months. I am almost ready to get the car running, however I have a problem with the RPM totally cutting off at 1700-2000rpm with the stim and on the vehicle. I have taken the jumper wire from js10, de-soldered it from q16 and re-soldering it at IGBTIN. I moved jumper jp1 to the 1-2 spot and moved jumper j1 to pins 5-6. I added a BIP373 ignition driver to the q16 spot. The bip373 kit came with a resistor that I was told not to use. I reflashed the firmware to MSextra 2.0.1 and everything seemed to go well. I must have missed something, or I have done something wrong. The car (BMW) runs off of a 60-2 crank wheel with a bosch 3 wire PWM idle valve and I am using the Glen's garage idle board. I have checked and double checked my wiring and various sensors with no ill results from that side. I knew there must be a problem with the MS setup when It would do the same thing on the Jimstimv1.4. I tried adjusting the "trim pots" at r52 and r56 to even out the crank trigger settings, but had no luck changing anything. Please HELP ME! I am almost ready to scrap the whole project!

FirstFives Dictator · Post by **FirstFives Dictator** » May 14, 2009 5:53 PM

alijonny wrote:I sent a message to diyautotune and wonder who else I may bother with this same message.

Hi, my name is Ali Yetgen and I bought a Megasquirt v3.57 complete board within the last few months. I am almost ready to get the car running, however I have a problem with the RPM totally cutting off at 1700-2000rpm with the stim and on the vehicle. I have taken the jumper wire from js10, de-soldered it from q16 and re-soldering it at IGBTIN. I moved jumper jp1 to the 1-2 spot and moved jumper j1 to pins 5-6. I added a BIP373 ignition driver to the q16 spot. The bip373 kit came with a resistor that I was told not to use. I reflashed the firmware to MSextra 2.0.1 and everything seemed to go well. I must have missed something, or I have done something wrong. The car (BMW) runs off of a 60-2 crank wheel with a bosch 3 wire PWM idle valve and I am using the Glen's garage idle board. I have checked and double checked my wiring and various sensors with no ill results from that side. I knew there must be a problem with the MS setup when It would do the same thing on the Jimstimv1.4. I tried adjusting the "trim pots" at r52 and r56 to even out the crank trigger settings, but had no luck changing anything. Please HELP ME! I am almost ready to scrap the whole project!

BTW, the tooth loggers are broken in 2.0.1 which I why I suggested a later version.

alijonny · Post by **alijonny** » May 14, 2009 10:10 PM

care to point me in the right direction?

alijonny · Post by **alijonny** » May 14, 2009 11:15 PM

I found this post on MS forums, however this is someone dealing with a v3.0 board.
http://www.msextra.com/viewtopic.php?f= ... em#p203384

what if I just sell this v3.57 and buy a v3.0? I am almost not concerned about cost at this point as much as function and personal health

seriously.

please discuss.

FirstFives Dictator · Post by **FirstFives Dictator** » May 15, 2009 5:26 AM

alijonny wrote:I found this post on MS forums, however this is someone dealing with a v3.0 board.
http://www.msextra.com/viewtopic.php?f= ... em#p203384

what if I just sell this v3.57 and buy a v3.0? I am almost not concerned about cost at this point as much as function and personal health seriously.

please discuss.

Try loading 2.1.0 release candidate or the April 13 beta. PM me with your email and I'll send you the zip file. At least then you could see the problem on the tooth logger.

I've not been able to verify but the available 3.57 schematics seem to imply that it uses values of components that might make it not work well for 60-2. There has probably been a running change, but I have no updated schemates.

If the board needs to be mod'd, you can send it to me. I build, repair and modfiy MS systems; surface mount is not a problem for me. I do charge for my shop time but I'm sure it's cheaper than starting over.

Did DIY know you're trying to use this on 60-2 wheel? Did Matt have any comment on whether there's any issue with component values?

alijonny · Post by **alijonny** » May 15, 2009 11:49 AM

this is the reply I got from diy I sent them exactly what I had written above:

"Ali,

Sorry to hear about all the trouble that you're having with this one. Lets see about getting you all fixed up.

The RPM cutting out on the car may just mean that it needs a bit more resistance in the tach signal line, which sounds about right, as some BMWs have issues getting a solid RPM reading without something like a 10k resistor mounted inline with the tach input at pin 24 on the MS. I'm not sure what the problem could be on the JimStim though, as that shouldn't need anything like that to work correctly. Could you take a datalog of what its doing here, on both the JimStim and the car, and send it in to us along with your current MSQ file?

Thanks,

Justin Shahan
Technical support
DIYAutoTune.com

FirstFives Dictator · Post by **FirstFives Dictator** » May 15, 2009 2:00 PM

email sent with later firmware

alijonny · Post by **alijonny** » May 17, 2009 7:02 PM

firmware downloaded and installed, I have the tooth logger working, but still have the issue with the RPM cut-off. If it helps any, the fuel pump light on the megasquirt cuts off at the same time the injector pulse lights cut out.

FirstFives Dictator · Post by **FirstFives Dictator** » May 18, 2009 5:53 AM

alijonny wrote:firmware downloaded and installed, I have the tooth logger working, but still have the issue with the RPM cut-off. If it helps any, the fuel pump light on the megasquirt cuts off at the same time the injector pulse lights cut out.

Fuel pump will cut off because the wheel is losing sync

Can you capture the log to a file and email it to me?

alijonny · Post by **alijonny** » May 18, 2009 10:06 AM

I will tonight, what rpm range do you want to see?

FirstFives Dictator · Post by **FirstFives Dictator** » May 18, 2009 11:03 AM

alijonny wrote:I will tonight, what rpm range do you want to see?

from idle until it quits reading rpm

Turn on the noise filter for primary trigger only (cycle power on MS after) and be sure to click the save to file box

alijonny · Post by **alijonny** » May 18, 2009 11:16 AM

well, since I have reflashed 2.0.1 the first time (prior to 2.10), it doesn't really idle anymore and I have not hooked up to the car for fear of major issues. I will try the noise filter on with the stim.

FirstFives Dictator · Post by **FirstFives Dictator** » May 18, 2009 11:52 AM

alijonny wrote:well, since I have reflashed 2.0.1 the first time (prior to 2.10), it doesn't really idle anymore and I have not hooked up to the car for fear of major issues. I will try the noise filter on with the stim.

You can't even get rpm on the stim?

alijonny · Post by **alijonny** » May 18, 2009 1:28 PM

same problem either way on the vehicle or on the stim.

alijonny · Post by **alijonny** » May 18, 2009 8:36 PM

i sent a file....see if that does anything for you.

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E28 Megasquirt FAQ