I have a boost referenced Kirban AFPR on it and it's rock solid. I also have an electric fuel pressure gauge. It's turned up to 41psi with the vacuum unhooked...Jedrik wrote:My consern with the stock computer running the fuel pump was because a typical (old school I guess) setup has a fuel presure regulator that senses manifold vacume. This way the fuel rail gets less pressure at idle.
This alows the injector open time to be larger at idle for better control.
If your stock computer has no way of knowing engine load it may be running full pressure all the time giving you trouble.. or even some random pressure if the MAF signal is getting noise.
You could probably still work around this though. I also encourage you to contemplate the injector open time more...
MegaScott wrote:Hey Jedrick, I find you and I have somthing in common, I too have black wiper blades.
Anyway, The stock Ford ECU does not control the fuel pressure on that model. I suspect the Stock computer is not geting the proper signals to be able to control the idle air properly, whether it be the air temp sensor or the Mass air sensor, or the PIP signal, or the VSS signal. The 95 Cobra has a pretty sophisticated idle scheme in a feeble attempt to remedy years of idle stability problems on the Ford. My prognosis is that due to outsourcing, the factory really has no control over the code, and since the firmware vendor is not responsible for the problems, the code never gets fixed and the car never really idles properly. Sadly this is a systemic problem, not only at Ford but at virtually all the Manufactureres where the firmware is outsourced to (seemingly) save a few bucks.
On my very first Megasquirt install, I too thought as Cuda6pak, "do a piggyback, It can't be that hard?" as I got into it I found the more things I had control over with the Megasquirt the better, The stock EEC goes off and does it's own thing, and often there is no rhyme or reason, it just does it that way. With Megasquirt the idle can be precisely controlled using the PWM output. Now with Megasquirt controlling the idle you have just one more wire to run, to the fuel pump relay control, and now you can unplug your stock EEC forever.
Ouch, my head hurts when I read that, hey at least it still runs?cuda6pak wrote:Small update (not good):
I wired the fuel pump into the MS and off the stock ECU. And now the car runs like "crap". There is a horrible miss/rich spot kind of between idle and part throttle like when I'm shifting gears.
Also, I can't floor the car at all now, it starts missing/bucking really bad when I go full throttle with it, no matter what the RPM's.
I know this can't possibly be because I switched the fuel pump to MS........I'm thinking maybe the plugs are all fouled, not too sure. Because literally 24 hours before that I drove around in it and it was running fantastic. Full throttle, part throttle were all smooth and crisp with no hiccups.
I also tried playing with the injector open time to no avail. Put it down to .9ms and no noticeable difference at all.
I also noticed my coolant temp was not reading on the MS. But that shouldn't affect anything since I don't have warmup enrichments, right?
I also tried setting up AFR tables. I went to the "settings.ini" file of car1 and unset the narrowband and set the Innovate LC1. Now, when I change the fuel tables to read the Target AFR table. Right when I go iinto the Target AFR table and click on the first box it locks up. I tried over and over and over and it locks up every time.
MegaScott wrote:Ouch, my head hurts when I read that, hey at least it still runs?cuda6pak wrote:Small update (not good):
I wired the fuel pump into the MS and off the stock ECU. And now the car runs like "crap". There is a horrible miss/rich spot kind of between idle and part throttle like when I'm shifting gears.
Also, I can't floor the car at all now, it starts missing/bucking really bad when I go full throttle with it, no matter what the RPM's.
I know this can't possibly be because I switched the fuel pump to MS........I'm thinking maybe the plugs are all fouled, not too sure. Because literally 24 hours before that I drove around in it and it was running fantastic. Full throttle, part throttle were all smooth and crisp with no hiccups.
I also tried playing with the injector open time to no avail. Put it down to .9ms and no noticeable difference at all.
I also noticed my coolant temp was not reading on the MS. But that shouldn't affect anything since I don't have warmup enrichments, right?
I also tried setting up AFR tables. I went to the "settings.ini" file of car1 and unset the narrowband and set the Innovate LC1. Now, when I change the fuel tables to read the Target AFR table. Right when I go iinto the Target AFR table and click on the first box it locks up. I tried over and over and over and it locks up every time.
Did you do anything else? like load in new firmware, or accisentally change a spark setting? I like to go through the "Review mode" when something like this happens, and usually I find the culprit.
Do you all of a sudden have no coolant temp, or have you been running without one all along? No coolant temp and the temp value goes to max right? There's lots of stuff that rely on that sensor to work properly in order for Megasquirt to work right.
Are you using Megatune 2.25 Beta, or final?
Don't scold me too bad, but I don't know how to datalog. I have yet to do oneJedrik wrote:That is curious.
Could you post a datalog?
With MSII at least, coolant temp also effects the timing and the accel enrichment (as well as the warmup enrichment and start PW)
