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  1. T

    1970s 40, 350/TH350 on Megasquirt 1 PCB3.0

    What's funny is almost 10 years ago I bought a CPI 4.3 to replace the 4.3 in a boat I had (spun a bearing) - and up until about 1 year ago I had that spider injector kicking around because the pintles/tubes were all in such good condition.
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    1970s 40, 350/TH350 on Megasquirt 1 PCB3.0

    I haven't pulled it apart, supposedly if you pull the intake top half off you can see it. I'm guessing it's a simple butterfly valve that opens/closes to allow additional air in. I have no reason to crack open the intake manifold, so for now I'm not going to. After looking at this, I...
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    1970s 40, 350/TH350 on Megasquirt 1 PCB3.0

    Putting this here as a note to myself.... 95 vortec CPI motors have an "Intake tuning valve" - which is an open or closed valve that allows additional airflow around 2700 rpm. Sounds like TVIS, and I believe that would be an easy workaround with MS to control...
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    1970s 40, 350/TH350 on Megasquirt 1 PCB3.0

    It's a tent trailer, the ad seems legitimate but not getting any responses from the seller. They have an address listed phone, and email - I tried email and phone. As for the engine - I just rummaged around.... I have a spare connector for the injector. TPS is the same as the 350. I can...
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    1970s 40, 350/TH350 on Megasquirt 1 PCB3.0

    I'm actually eyeing a trailer in Woodinville, just waiting to see if the sellers respond. Hoping it's a real ad....
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    1970s 40, 350/TH350 on Megasquirt 1 PCB3.0

    Ehh, I'm not sure it's worth it to go so far as check angles. It's going to be a quick stab-in of thicker gaskets and if it works, awesome - if it doesn't, slotting the 4.3L to go in. Mentioned previously, I have a 4.3L CPI vortec V6 that has less than 4k miles, has a new spider injector, and...
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    1970s 40, 350/TH350 on Megasquirt 1 PCB3.0

    I ordered a set of (reasonably priced) thickest intake manifold gaskets I could find - a set of Felpro race gaskets.... just to hopefully get more material between the heads and the intake. Hoping I can disconnect as little as possible to do the job. We'll see about that. That, and checking...
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    1970s 40, 350/TH350 on Megasquirt 1 PCB3.0

    I agree. The engine I bought from a friend ~5 years ago. It came from a running/driving truck that seemed fine. However I've had constant running issues with it. As the story goes it has a cam and "had a bunch of work done to it" - back in the late 80s. When I resealed the engine - tearing...
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    1970s 40, 350/TH350 on Megasquirt 1 PCB3.0

    Playing with the 40 this weekend and it isn't looking good. I'm on the verge of yanking the 350 (and MS) and throwing in the 4.3L with complete harness and a new pump in. Megasquirt isn't the problem - it's doing exactly what it should. It's tuning as expected. If I lean the curves out, the...
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    1970s 40, 350/TH350 on Megasquirt 1 PCB3.0

    Haven't had much time lately to dedicate towards the 40 (septic issues, and I'm literally digging 1/4 our yard up, newborn, puppy, work).... Took it on a short trip to the store - it ran horribly. Realized almost as I got there it was out of fuel. Pro-tip - autotuning your VE maps when out...
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    1970s 40, 350/TH350 on Megasquirt 1 PCB3.0

    it was noisy because it has over-fender headers made of thin metal, leaking collectors, at least 1 of the gaskets at the head was broken, and the mufflers were crappy "turbo sonic" from the late 70s. I wasn't saying the engine was noisy from a bad tune/timing. The bad revving is probably...
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    1970s 40, 350/TH350 on Megasquirt 1 PCB3.0

    So an update..... Things have been busy around here (we bought a 100 series, been doing some work with that, we got a GSD puppy, and wife is 9 months pregnant - literally past her due date as I type this) so the 40 has taken a backseat. One of the "issues" is that the vehicle is too loud for...
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    1970s 40, 350/TH350 on Megasquirt 1 PCB3.0

    Photo....
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    1970s 40, 350/TH350 on Megasquirt 1 PCB3.0

    Ignore the mods that were displayed above, and if you do anything like this yourself - ignore the HEI upgrade kit. I don't understand (at all) how it's supposed to work - and for me, it didn't. Not even remotely. Now.... on to what was actually done. As I mentioned previously, the HEI...
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    1970s 40, 350/TH350 on Megasquirt 1 PCB3.0

    Super hardcore tip for the hardcore section..... sometimes coils need a good ground, and your coil wires need to have a good connection. Spent nearly an hour trying to figure out why it would crank and run with the starter, playing with timing, but wouldn't stay running. Clipped the ends of...
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    1970s 40, 350/TH350 on Megasquirt 1 PCB3.0

    So progress! Not happy with the 'promise' that comes with the DIYAututune HEI kit of it being easy. The instructions just don't make sense. For instance - they have you wire the 5V v-ref to pin 6 (as I mentioned above). Well if you go back a few pages in this thread, you'll see that I...
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    1970s 40, 350/TH350 on Megasquirt 1 PCB3.0

    For anyone following, I'm now sort of "typing out loud" and curious on your thoughts, while I impatiently wait for a response from diyautotune. The instructions for the Hall/Opto and the triggering off the coil negative seem very different when you initially read them. That's why I went with...
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    1970s 40, 350/TH350 on Megasquirt 1 PCB3.0

    Finally got some more time to work on it, a little bit. The modifications to the ECU don't seem to be working - it isn't getting any kind of signal from the distributor. I know it, and the new coil, are wired properly as it's sending spark and the tach (gauge in the car) is registering while...
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    1970s 40, 350/TH350 on Megasquirt 1 PCB3.0

    Well..... technically the chain cover and oil pan are re-installed. The Felpro Permadry one piece oil pan gasket set is a nightmare to install... at least in this vehicle. It comes with plastic studs which are supposed to be screwed into the 4 corner bolts of the oil pan - then push the gasket...
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    1970s 40, 350/TH350 on Megasquirt 1 PCB3.0

    Back to the project (have had some delays with life happening).... I got the diyautotune kit - the instructions I found were a bit vague - did some research and just went for it. We'll see how it goes. I originally had the pins and wires on the bottom of the board but the case didn't clear...
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