niner11

datalog: Could all of this be from the crappy wires I have? datalogspike issues.zip

Thanks Dave. I just disconnected the alternator to take it out of the equation. Reflashed the cpu and loaded the new Msq file...the car now starts right up without damaging the injector drives but now I have resets The MS box resets even using the factory 7mm wires...I have magnecor's on the way but they have not been delivered yet. Any ideas? Thanks, Chuck

Thanks, I'll try that once I fix my MSII. The injectors only draw about 2.15 amps per bank and together both banks only draw about 4 amps. I also checked the resistance of each individual injector. They all were identical at 14.7 ohms. Any ideas? Thanks, Chuck

Update. I replaced both Q1 and Q5 on my MSII a few hours ago and checked out everything on the stim board. Both banks of injectors operated normally....until I tried to run the car. I'm using high impedance injectors and the fuses for the injector circuit on the relay board are 5 amps. What I can't figure out is why these injector drivers (Q1, Q5) keep frying. MS should have several layers of protection from an alternator over volt or spike and with 5amp fuses the actual 20amp drivers should not fail. I checked amp draw on the injectors, remade my injector harness, swapped relay boards and relay cables and still have the same problem. Btw, I checked the relay board once it was mounted on the firewall and the case had no shorts. I'm starting to think that it is one of two things. Either the alternator is spiking through a power source or my MS has some un diagnosed problem Before the MsII went back in the car for this go around I ran a bunch of the trouble shooting tests on the entire injector circuits using an LED and per the megamanual. One one hand this is pretty interesting but its frustrating at the same time. I'll get it running eventually but if anyone has any ideas I'm all ears. Thanks, Chuck

Well, I fixed the msII box and then hooked up my new injector harness. After a few minutes of cranking where the car almost ran I put the MS back on the stim and found the same problem. Only one of the two inj lights would blink. I have more parts coming in the next few days so I wil fix the MS again and try some more ideas. PLease...keep any of your thoughts coming. I appreciate the help from everybody so far. Chuck

I'm about half way finished with this new injector harness.... Pretty new to this If you are running high-impedance injectors (greater than 10 Ohms), then set the: PWM Time Threshold to 25.4 msec, and the PWM Current Limit (%) to 100%. (The presence or absence of the active flyback circuit (v3) or flyback board (v2.2) doesn't matter for high impedance injectors.) If you have low impedance injectors (less than 4 Ohms), set the: PWM Time Threshold to 1.0 msec, and PWM Current Limit to 30% in most cases (all V3 main board with active flyback installed, and all V2.2 main board with flyback daughter board installed). Looks like with high impedance injectors I should be good regardless. As soon as I finish this harness i'm going to check the resistance of each injector circuit and go from there per Matt at DIY. Hopefully something is obvious then.

Thanks for the replies.....It is a MSII ver3 board. I just went through the injector harness and found no shorts. Also individually grounded each injector on one side and 12v on the other. They all seem to operate fine. To rule one thing out I'm remaking the injector harness since I have been unable to find the problem so far.

High impedance injectors. I was sure it was a bad injector but they all check out fine.

I have an MSII setup that mirrors the DIYautotune and Moby install on an 82 280zxt. I'm using hall effect via the factory 82 dizzy to trigger the ignition and it seems to be working since my timing light flashes when I crank the car. The problem seems to be with the injector circuit. After trying to run the car just a few seconds it appears that Q1 or Q5 fries itself. Matt from DIY suggested that it may be a shorted injector causing the problem so I checked them and all were almost exactly the same....about 14.7 ohms. Also checked the injector harness for a short and they dont have continuity....so okay there. I built the box myself so who knows what other variables there are regarding what is wrong but it checks out on the stim. My msq is borrowed from an almost identical setup from Cygnus (Dave). The timing is very close so I'm wondering if there is anything else I may have overlooked? I'm changing out my relay cord and double checking the relay board but other than that I'm not sure. Any ideas would be great, thanks. Chuck BTW.. the signal is inverted per the write up. Also, I had to ditch the TAYLOR wires since it was causing resets.

Nice work. Will there need to be a TPS of some sort when its finally installed in the car.

thanks.

Nice install and thanks for posting your MSII msq. Wondering about the bosch idle valve. Is it possible that until the valve powers closed (after warmup) that it vents boost pressure. From stock pics that I have looked at I think it was plumbed back into the J pipe. Just wondering because I would like to do the same thing you have by venting the valve to atmosphere. Thanks

That looks pretty good. I have working A/C too and I will run the pipes under the car before I wil pull the A/C out! Do you have more pics that you could post? Thanks

I remember reading somewhere that the oil drain on the turbo housing needs to be nearly at the 6 o'clock position. I couldnt find any good pics and just wanted to confirm that the oval port is the oil drain and the larger NPT threads are for water cooling. Also, if there any issure with clocking both the hot and cold sides of this turbo (t3/t04e)

Hey, did that turbo ever go back together?

I was just searching the archives but it seems that there are a bunch of different combinations out there when it comes to turbo setups. I have a stock T3 that just started to blow a ton of oil so I'm going to replace it with a hybrid T3/t4. I'm running an 83 l6 turbo with MSII and 35lb injectors and was wondering if this turbo would be good to grow into: Garrett T3/TO4E 60 trim w/ .63 a/r and opinions about this for a setup?.....It's my understanding that the turbine side still uses the same housing but I'm not sure. I have a custom downpipe that bolts up to the current stock T3 housing so I'd like to keep that. Thanks, Chuck

Hey congrats Z_Dust. I just saw the video and I'm a little jealous right now. Still have a bunch of fuel plumbing to do but at least my turbo motor is in the car now. My setup should be very similar so if you wouldn't mind sending me a copy of you settings I'd appreciated it.

Any updates?

Very nice car and the paints looks great in the new pics. I remember reading about the pissed off guy a while back and I think his screen name is Alpha 1 or alpha one. You should do a search and find this guy to make things right.

Thanks, I needed to know what it was so I can configure the MSII correctly.

Thanks guys for the info. Just so I know how to configure my MSII, are the cas sensor dizzys(82/83 models) "Hall Effect" sensors? It looks like MSII can run my spark without an external 7 or 8 pin HEI but I'm not sure yet. Chuck

Been searching a lot but not sure if the 82/82 distributor is completely self contained. I have seen pics of the earlier (81) model and it has external teeth on the crank pulley and a sensor. Trying to confirm if the later dizzy can be stand alone. I'll probably be wiring my set up like Moby so it will have the hei module but other than that I need more info on 82/83 dizzys Thanks, Chuck

Gavin, help me a little and describe what is in the pic. I have been researching megasquirt for a few days now and I'm aware of the low resistance problem with nissan injectors but not sure if a flyback board or 6ohm 25 watt resistors are the solution. Thanks, Chuck

Can you show us a pic of the resistors for the stock injectors installed on your car. I'm guessing that it doesnt matter which of the two injector wires it is installed on since the other one will just be a ground. Thanks, Chuck

I had the same problem with my 87 300 a few years ago and a junkyard MAS solved the problem. I think it cost in the neighborhood of 35 to 55 dollars but it was for a NA