![]() ![]() There are two negative effects to this: 1) Fuel in the exhaust drastically increases hydrocarbon emissions. Popcorn is named after the sound that late combustion / misfires that dump fuel into the exhaust make (like you're popping popcorn in the exhaust). If the CSL you guys were showing was active, your Torque Source (not Torque Airlimit or DD Limit) would be Combustion Stability Limit. ![]() In this case, its not the Combustion Stability Limit you guys were discussing though, but the cold combustion stability limit. You guys are somewhat in the wrong area, but pretty close.įirst off, when Torque Airlimit Source becomes Popcorn, DD Limit will always be Combustion Stability Limit. I have got my TIP error lower and the Turbo FMEM Limit I was experiencing has gone away - for now. I hate to work on eliminating them, not knowing why they are there in the first place.įYI, as of now I think my Turbo FMEM limit was a result of underboost. Comb Stability & Popcorn in particular) and what control actions are taken when they are reached. I really wish someone could explain what causes these limits (i.e. I still have the Popcorn Limit, maybe I have to get it worked out before the Comb Stab can be addressed. Why have a minimum then a maximum?Īnyway, according to my log/s Comb Stab Limiting comes into play before these min/max TQ levels and max MAP are met. TQ before Comb Stab Limiting, yet scalar 50295 is the max. According to the status bar help, table 4217 is the min. I really don't get the parameters offered. Turbo ACTTable 4217 was introduced, for my OS, in a recent VCM Suite update, though I still have not been able to get around the Comb. It looks like that table is 3630 - Turbo Airflow vs. I only have the pressure ratio table, so I may need to ask to have the airflow table added. I don't have it in my calibration so I can not personally verify this. Engine Speed available in your OS? I have seen several threads now that point to raising those as a way to help or eliminate the combustion stability limiter. See attached log file.ĭo you have 4217 - Combustion Stability Min Brake Torque vs. ![]() Ford really did a good job to be able to deal with them and maintain excellent performance.Īny help/ideas will be much appreciated. My performance is much improved over stock, even with these limits occurring. I probably will not change these too much cause in an effort to have turbo longevity. I?m thinking the turbo protection parameters, are at the root this. The Turbo FMEM Limit is new to me (my latest tune) and I haven?t gone hunting to attempt to find the cause. I?m not sure if the firmware/OS will accept a parameter above/below the max/min specified in the editor, without some strange result.Ĭan anyone help with how the Combustion Stability and Popcorn Limiting works? Knowing how it works and what actions the PCM take when these limits are reached/exceeded would be helpful. If this is absolute (?), when the boost is approx. tuners) exceeding the parameter range allowed in the editor to get past some limits? For example the Max MAP before Combustion Stability Limiting is 65 inHg for my strategy. I have raised, maxed, lowered all of the Combustion Stability and Load Limiting parameters, and still cannot get past these limits.Īre you guys (i.e. Limit? and ?Turbo FMEM? limits under the Driver Demand Limit Source AND ?5 Popcorn? and ?2 Turbo FMEM? under the Torque Airlimit Source.Įven with the latest verson of HPTuners, I still cannot figure out how to prevent/raise the Combustion Stability Limit and/or Popcorn. Thought maybe it?s time to ask for some help. Contact Support for more information.Well I?ve been tinkering with this for a while now on a 2015 2.7L F150. Also, we may be able to transfer credits in the case of a lost or stolen device. However, if you are upgrading a device by exchanging the old one, we will transfer the credits to the new interface. Recovering Creditsĭue to security concerns, we cannot transfer credits from one interface to another. Those credits are still valid and will be accepted if they have not been used. Older MPVI units used brand-specific credits. Universal credits can be used for any vehicle we support, regardless of year, make, and model. Most vehicles require between 2 and 6 credits to license. How to purchase credits?Īfter you register your device at you'll be able to purchase credits. Unlicensed vehicles cannot be tuned with an HP Tuners interface. A license is tied to a vehicle's VIN, Serial number of the controller and Operating System on the controller and allows the interface device to write your modified tune files back to the licensed vehicle. What are credits?Ĭredits are the currency HP Tuners uses to sell licenses for specific vehicles for tuning. Licenses are purchased with HP Tuners Universal Credits. In addition to an HP Tuners interface device (such as MPVI2, 2+, or 3), you will need to purchase a license for each vehicle you want to tune. ![]()
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