taylor76zharris Posted July 11, 2012 Share Posted July 11, 2012 Iv been doing a lot of reading about MS and have talked a little to the guys at DIYautotune.com. I was just wondering just how had it really is to install. Ive got an 78 280 with a l28et swap. Alos how many of the stock sensors from the motor can i use with megasquirt. Thanks, Taylor. Link to comment Share on other sites More sharing options...
SleeperZ Posted July 11, 2012 Share Posted July 11, 2012 Install is fairly easy; troubleshooting and tuning is where I have spent my time. You shouldn't use any of the stock sensors unless you feel like calibrating them -- it's much easier to buy the GM sensors and use them, the only one that fits in the stock location is the coolant sensor anyway, and the intake air temperature is not present in the stock L28ET. You need to adapt a different throttle position sensor, tap the manifold for the air temperature, tap the thermostat housing for water temperature, wire the L28ET distributor, and make sure you have an O2 bung downstream of your exhaust downpipe. Link to comment Share on other sites More sharing options...
taylor76zharris Posted July 11, 2012 Author Share Posted July 11, 2012 Well wont the tps off like a 95 240sx work? One other thing.. when you say "wire the distributor" you mean wire it to the megasquirt ecu, right? I was also thinking of using the distributor with the CAS with the megasquirt. right now i have the 81 style with the trigger wheel and external CAS. Link to comment Share on other sites More sharing options...
SleeperZ Posted July 11, 2012 Share Posted July 11, 2012 Well wont the tps off like a 95 240sx work? One other thing.. when you say "wire the distributor" you mean wire it to the megasquirt ecu, right? I was also thinking of using the distributor with the CAS with the megasquirt. right now i have the 81 style with the trigger wheel and external CAS. Yes, I think the 240SX TPS units will work. I used one off a Hyundai. I don't think there is any support in MS firmware for the '81 CAS. And I had trouble resolving the Z31 wheel in my '82 distributor, so I don't think the 280ZXT wheel will work well either because of the extremely narrow slots. The custom wheel from DIYAutotune is very good though. Link to comment Share on other sites More sharing options...
duragg Posted July 11, 2012 Share Posted July 11, 2012 I am on the same track. Reading and studying. At some point you just dive in and keep fixing till it works. I think it will be self teaching at some point. I have the software downloaded and playing with that, but again it is just masturbating until the real parts are there. Link to comment Share on other sites More sharing options...
taylor76zharris Posted July 12, 2012 Author Share Posted July 12, 2012 haha duragg! So If the stock CAS on the 81 wont work and the internal CAS distributor on the 82, 83 wont work, what should i use for the CAS? I keep reading about everyone useing GM sensors but i just dont even know where to start. Link to comment Share on other sites More sharing options...
taylor76zharris Posted July 12, 2012 Author Share Posted July 12, 2012 I suppose i could use one from DIYautotune? The cas that is. Link to comment Share on other sites More sharing options...
loy Posted July 12, 2012 Share Posted July 12, 2012 The 82-83 turbo distributor will work. The 81 cas will work with some modification such as grinding every 2 out of three teeth, and using a hall effect sensor. http://forums.hybridz.org/index.php/topic/77233-30-1-tooth-wheel-with-cherry-hall-effect-sensor/ Link to comment Share on other sites More sharing options...
akeboshi Posted July 12, 2012 Share Posted July 12, 2012 The easiest way is to use the 82-83 distributor with the diyautotune cas. The car is much easier to start up the first time with it as the ignition timing can be pretty far off and still start. I had ALOT of first start problems with my locked out dizzy but it runs well with that also. As for the sensors use the stock coolant sensor, get the gm open element air sensor from diyautotune.com and get a new tps from autozone for 25 dollars. It would be from an automatic 240sx. MS2 would be good enough for you to learn on. What I would have you do is email matt from diy and ask him what he would recommend for your setup and then google the s-word out of all the items he lists. This is definitely a read and study and learn type of project. Link to comment Share on other sites More sharing options...
letitsnow Posted July 12, 2012 Share Posted July 12, 2012 Wait, does the 240sx tps bolt onto the zxt throttle body? That would make my life so much simpler, I thought you had to swap the 240sx tb on and modify linkage. Link to comment Share on other sites More sharing options...
kaito Posted July 13, 2012 Share Posted July 13, 2012 What I did for my 240sx tps was, I cut off the old mounting ears from the old l28 tps and drilled holes more holes in the ears, then I bolted the ears to the 240sx tps and then mounted that on the stock l28 throttle body. The sx tps is narrower at the mounting points. Link to comment Share on other sites More sharing options...
loy Posted July 13, 2012 Share Posted July 13, 2012 What I did was bolt the tps to a bracket then bolted that to the throttle body. Link to comment Share on other sites More sharing options...
dexter72 Posted July 13, 2012 Share Posted July 13, 2012 And you can use the stock z coolant sensor, The calibration data numbers are in the megasquirt forum. Takes less than a minute to put the numbers in Megatune. Link to comment Share on other sites More sharing options...
taylor76zharris Posted July 13, 2012 Author Share Posted July 13, 2012 this is what i ordered after talking to the guys at DIY. i thinks its a pretty basic setup but sould get me started. MS2357-C $444 Assembled Megasquirt-II with V3.57 PCB MOD_2357IGN1: Single Ignition Output through BIP373 coil driver $20 MSStim22-C $69 Assembled Stimulator MSHarness $67 8' wiring harness IATwPiggy $22.25 Intake Air Temperature Sensor 38NPT-Bung_A $9 Aluminum bung for IAT sensor (Also available in stainless steel) TuneCable $5.50 6' DB9 tuning cable USB-2920 $22.50 (Only needed if your laptop doesn’t have a true DB9 port) MTX-L digital gauge system $199 Anything else i might need? Thanks, Taylor. Link to comment Share on other sites More sharing options...
SleeperZ Posted July 13, 2012 Share Posted July 13, 2012 Wideband O2? Link to comment Share on other sites More sharing options...
Zmanco Posted July 14, 2012 Share Posted July 14, 2012 (edited) Mod to control eFan via MS? (Forget what DIY calls it). GM coolant sensor 2nd Baro sensor is good too, but if I recall from my high school geography classes, Oklahoma is pretty flat so maybe not necessary. Edited July 14, 2012 by Zmanco Link to comment Share on other sites More sharing options...
taylor76zharris Posted July 14, 2012 Author Share Posted July 14, 2012 Yes i went for the wide band o2 (MTX-L digital gauge system), not complety neede but i read it makes tunning much much eaiser. Your right, this place is pretty flat. Can i not use the stock coolant sensor? I canat wait to get this started, this is a great forum. Link to comment Share on other sites More sharing options...
Zmanco Posted July 14, 2012 Share Posted July 14, 2012 If you use the stock coolant sensor, you can't use it for the dashboard gauge. Link to comment Share on other sites More sharing options...
dexter72 Posted July 14, 2012 Share Posted July 14, 2012 I think the calibration data numbers to use the cylinder head temp sensor, as the coolant temp is in the Megasquirt forum also. Might be the same cal data as the coolant temp sensor. Link to comment Share on other sites More sharing options...
taylor76zharris Posted July 15, 2012 Author Share Posted July 15, 2012 Is there a certain GM coolant sensor i should get, like one that will thread into the stock spot? Or will i have to tap my own? Link to comment Share on other sites More sharing options...
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