MSefi.com read only forum (Jan.15,2018)

I would suggest wiring your injector banks 1-4-6-7 and 2-3-5-8 as Ford, and 1-4-6-7 and 2-3-5-8 as most GM and Mopar did with obviously good success. Note that the layout is the same for all the engines when you take cylinder numbering into account.

David

I think your wheel dimensions will be okay. You need to determine where the failure is - MS or EDIS or the wiring. I would disconnect the SAW wire to let EDIS run on its own default timing and try. While trying and if you get no activity from MS, probe the PIP wire to see if EDIS is sending a signal ...

I appreciate your thoughts David.
However, the valves by design are metal to metal seal. Any slight leakage could be compensated for by the Megasquirt ECU - in fact, I think some of these valve designs are intended to not 100% seal as they just don't need to. It may be the wrong valve design for ...

I understand your thinking and your concern as you have an untested system, however, I have two thoughts. A) You shouldn't have the leaking valve. If you do, it's like any other car - fix the leak. B) If piped after the turbo it can't flow enough to sustain manifold pressure and hold the turbo in ...

2) A simple way of making the TPS non-linear (more effect at low openings) is to add a resistor between 5v and the wiper. ... That certainly is simple, and a "Why didn't I think of that?" solution. Awesome! And thanks for reporting back with what you found so others can benefit.
http://i37.tinypic ...

For that you'll need a small sensor that can read small teeth. The ATS617 would be an example and is available through Digi-Key here . This sensor can be mounted by any imaginable method (right on a convenient surface with epoxy for example) and wired to MS using standard Hall sensor setup. Many ...

Sounds interesting, but more operational spec's would be nice. Just as a note, it is commonly thought that Hall sensors need shutters or flying magnets, but that is only the non-biased type. Most of the ones used by MSers are the biased digital type and I much prefer them over other sensor types ...

You got it. You may find that 8 injections/cycle will limit your RPM under load more than you think and 4 may be where you have to stay. This happened to me, but I did a work-around by bumping the fuel pressure to reduce the DC. Test it. Also, I found most GM TBI injectors seem to like .8-.9 ...

... I've talked to a couple of GM mechanics that confirm that the IAC should home by CLOSING at key-on, and have confirmed this on my current 4.3 engine. This seems the more logical operation to my mind, by having the Idle Air bypass wide open, wouldn't the engine immediately jump in RPM when first ...

Both systems are reliable. The crank-triggered setup will be slightly more accurate due to less mechanical tolerance (slop), but more than adequate for most purposes, if your parts are not worn excessively. Personally, I would plug-in the dizzy and get it running well, and save the extra EDIS work ...

I see. Although I have tuned an ITB car, I did not have the issues you are experiencing. Then it would seem your solution has potential (no pun intended :D ). Alternatives would be a progressive (recessive?) TPS linkage creating the same effect, installing MAF in the air box inlet, or stepping to ...

Just that it doesn't include sensors, TB, etc., and you can't just 'plug it in' to your GM and crank it up. Other cost considerations are that, while it is primarily spearheaded by a couple brains on the east coast, much of the development, debugging, coding, testing, and application knowledge comes ...

MS can do that for you using your existing setup. Although different emissions guidelines applied, I 'squirted a GM TBI truck and gained substantial fuel mileage and noticeable power increase, due to the crappy factory tune to meet those emissions requirements. No hardware changes - just spliced-in ...

Sounds like you're following a path well beaten. Do searches for MS on bikes. Myk777 is currently running a really nice quad we saw at the Seattle MegaMeet with features and info you may be able to use. Search his posts and look for others, as most of the info you need is already here, and on some ...

litebulblsc wrote:Would I be able to Make my motor run like I want just using the megasquirt system for ignition and fuel injection, or do I need to piggyback it?

What do you mean by "run like I want"?

David

Sure, there are many ways to do the TPS and use old carbs. This was much more common years ago with the early EFI conversions. Here is a page with one example of a Holley stripped for a throttle body. Actually, all the stripping is not necessary either, and my first MS conversion was with an intact ...

Hook it up to take advantage of MAP change and maintain pressure differential. While you can tune around a non-referenced regulator, you rapidly see potential issues from low fuel pressure and flow under boost, to large VE compensation numbers. Two questions - Does the other ECU require a referenced ...

I'm not sure what you mean - but I am assuming 'messy' means it's too sensitive? If so, you should be able to tune around it with larger TPSdot numbers, if they are appropriate. In effect, a small throttle change makes a rapid change in air flow, and so there should also be a rapid change in AE ...

...FWIW, I already had a length of nice 2-conductor 20AWG braided shield wire I'm going to use. But - I noted (before I found what I already had!) this is very difficult to find, let alone in less than 100ft. coils. Yes, Aircraft Spruce has helped a lot. For shielded wires in shorter lengths ...

Awesome info, and many thanks to Al, Bruce and Lance for everything. I can see why you guys are so excited about much of this! I already have several projects planned that will use the info presented Saturday. 8) It was also great poking around some of the MS projects that were there. The Quad was ...