So as the starter is now cranking the motor, the ECU now counts how many ignition strokes the motor is turning and then starts reducing the Corrected Primer Pulse. There are 2 other compensations still to go! So we have the Primer Pulse * RPM Correction Factor = Corrected Primer Pulse. In a future chrome ROM, I might make use of this for an alcohol switchable map. The coolant temp switch value between these two tables is -4 degF so again. As you can see, both tables are the same so coolant temp is irrelevant. There are two tables and coolant temp determines which tables is used. First one is a multiplier which is looked up based on how fast your starter is cranking the motor. As you can see, the cooler the coolant temps, the longer the injectors are held open.Īfter this primer pulse is setup, there are various corrections which are applied to it. The value comes from from a table which I've dubbed "Cranking IPW " and then there is an Adder value applied, then this Primer pulse sent to the injectors. Once the engine first starts rotating from the starter, there is a single injector pulse that is calculated. The ECU simply calculates an IPW based on a few factors. As it turns out the fuel table, injector size and latency tables are completely ignored during this time. I believe the answer to the issue with "hot starts" on some cars can be fixed in here. Turns out, there's quite a bit going on when you turn the key. To start viewing messages, select the forum that you want to visit from the selection below.ĩ0% of you probably won't ever need to modify these tables but I was curious how the start up routine worked in the ECU.
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#Injector cranking primer enrichment evom mods#
The 3000GT / Stealth / GTO Mods and Tech support Some of the finest minds in the community use our forum and post here. The 3000GT / Stealth / GTO Classifieds The perfect place to find that part you need or sell the part you no longer need. The 3000GT / Stealth / GTO Garage Members Cars from across the world If you feel something is missing or have a suggestion that you think will help, please don't hesitate to send me a PM or post a comment in the suggestion forum. We should have all of the features you'd expect and maybe a few new things to use. If you are coming from another forum many things will seem similar many things will be different. I believe that a site with the members and the community as the focus can do the job better in the long run. The 3000GT / Stealth / GTO community needs a site that's focus is the support of the community and not to make money. While they may provide a stable platform if you look closely you'll see that the decisions they make are designed to make them money and keep you on the forum. These sites fail because they are not focused on serving the community they are focused on making money for their owners. Some of the major 3000GT / Stealth / GTO sites despite their size do not do a good job servicing the community. Welcome to, The enthusists site for the the Dodge Stealth, the Mitsubishi 300GT and the Mitsubishi GTO.Tuning, Engine electronics and ECU discussions.There may also be a second pipe off probably number 3 TB this is for a variable fuel pressure relief valve, which again you'll need to block off (even if you're using a variable PRV like Powerboost as the fluctuations are too high in a typical car conversion). Blank this off if you're not using a MAP sensor. Next, the pipes.there is one pipe that goes to all four TB's. Somewhere around 4-6 deg btdc isn't uncommon on idle. Also you may find to avoid a potential flat spot just off idle you may need to set the idle a bit high so the butterflies are open more and then bring the idle down again by retarding the ignition. As you say the butterflies are hardly open on idle, so it's important to check the balance once you get it running as any imbalance will show as very rough running. It's largely for this reason that most ECU's in this type of setup run from a TPS for their load sensor and not MAP.
#Injector cranking primer enrichment evom crack#
GSXR TB's have some quirks around idle due to the rapid change in MAP when the throttles crack open. you might find some stuff on my website that's useful, just click on the link below and head for the Westfield stuff.
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