Deceleration fuel cut off hp tuners software

Rpm limits the vcm has a number of rpm limits that disable fuel if exceeded. Hp tuners offers a number of enhanced operating systems for various applications. Youll need a separate fuel system to feed them, i think this water tank could work real nice. Dcel return is when it begins to put fuel back in the system under deceleration. The deceleration fuel cutoff dfco technology applied in the chevrolet cruze increases the cars fuel economy by up to 2%, depending upon specific driving conditions and behavior, gm said. Disabling dfco deceleration fuel cut off will help to not skew your results when logging. Here is a quick down and dirty how to for those of you who like a little more noise from their srt4 during deceleration. Hp tuners, the home of vcm suite and the mpvi since 2003. Now enhancing these to new heights with a new feature rich vcm editor and vcm scanner, coupled together with the latest generation mpvi2, this is only tuning and diagnostic solution youll ever need for your modern obdii vehicle. I had some weirdness with the decel fuel cut on one bike. Hp tuners video guides ls1tech camaro and firebird forum. My primary interest at the moment is to disable the decel fuel cut off i really.

However, he can control it with his software he could flash the ecu and. To cut a very long and complicated algorithm down into its bare bones, you should have the following basic functionality in your transient fuel cals. For example, gm has claimed 2% increase in fuel economy on their cruz. Nov 29, 2018 to reduce it may not totally go away popping on deceleration first make sure that you do not have any intake or exhaust leaks. That way, if the changes you made had a negative effect, you can just revert back to the previous one. My onboard fuel economy gauge, went to 84 during these long down hill runs.

This video will show you how to use your hp tuners scanner to get rid of partial throttle knock. Trying to learn the terminology, the interface, specially the scanner and how to get errors from there and use them to correct the actual program. In this video i explain the how to disable or turn off the. They tend to have much more sophisticated controls for decel fuel cut and fuel cut recovery. Setting up power enrichment pe fueling tables pe enable delay rpm pe mode will be delayed until the rpm is met. For example, during a deceleration fuel cut, no fuel will flow out of the fuel rail because the injectors are disabled. Fuel cut can cause harsh on off on throttle transitions that upset the bike especially while full lean in a corner. So by eliminating the deceleration fuel cut off, were going to be having fuel and air pass through the combustion chamber and some of that is likely to end up popping in the exhaust. What im trying to say is that everywhere else in the hptuner software where an actual degree angle for throttle blade is referenced, the range is 0 to 90 degrees which is understandable 0 deg being fully shut 90 being fully open upper limit is 84 deg.

Jdm ecus will still need to use the original demon unit for fitment. At its most basic levels, this allows for changes to fuel, spark, and air. I tried disable deceleration fuel cut, didnt much care for it in my application. Im guessing people who have been remote tuned have always been advised by their tuner to use an aem gauge that has. The ecm is a simple computer that runs software programs. How to fix partial throttle knock using hp tuners 3. Range technology active fuel management disable device blue.

Turn off dfco and cot i need to clean up my maf table a bit and need to know how to make sure dfco and cot wont jack with my fuel trims. You probably wont get a whole lot of data above 10,000 hz or below 2000 hz, but get as much as you can. If excessive rpm limiter activity is detected then resume limits will switch to these values. However, the deceleration area of the base fuel table can be tuned leaned to alleviate this condition. The best way to handle this problem is to increase the engine displacement setting constant. Hp tuners disable dodafm chevy silverado and tahoe. When you coast down a hill, you engine actually cuts fuel. Go do enough driving to log a variety of maf frequencies. Using a value of 0 turns the feature off, and a value of 1 turns on this option. Jun 03, 2015 this video will define a ton of high performance tuning terms. Cot dumps extra fuel in to cool off your catalytic converters. How a pcm calculates and corrects the fueling 3800pro forums.

In this webinar well be using the hp tuners software coupled with a ls2 6. Make sure you log dynamic airflow vs maf frequency hz in hp tuners it is measured in lbmin so we will have to convert this later for the maf table gsec. Im ready to buy a tbi system and there are a couple features im not sure the sniper efi supports. Learning from tuning software training to custom tunes hp tuners dealer vcm suite free 2hr training session with purchase, credits and. There is not, as far as i know, a way to cut off more fuel, or control the actual afr that dfco commands when enabled. On the left, you can see where we shut off the dtc codes and set our maf to. A friend did a custom bin files with deceleration fuel cut disabled for me and my other friend.

Disabling cot catalyst overtemp will do the same as disabling dfco except it will pollute your data with rich readings, note. Look for more tuning videos on the srt4 and hptuners in the near future. This is the multiplier that the ecu uses to determine the base fuel schedule bfs. Double check that you are sure your car will not shut off, and that the. Table 12073, the torque limit table, is basically the floor that the torque will drop to when the limiter first hits. This video will define a ton of high performance tuning terms. Sep 22, 2011 dfco deceleration fuel cut off tables while tuning, you want to disable dfco so your scanner does not pick up skewed data. I have ls3 with dying idle condition, but only on very long deceleration. Id just like some guidance or ideas on what everyone does to make the dfco more effective, or how to go about making some changes in that area. It also can cause popping on deceleration when off of the throttle. Ford engine fuel control fuel cutoff, dfco hp tuners. The usb device manager must report hp tuners mpvi channel a and hp tuners mpvi channel b and hp tuners mpvi usb drivers should be in your addremove.

I am not going to put the stupid disclaimer up that says do this at your own risk. For example, with your right foot you want to control the acceleration of the vehicle, you. Your browser does not currently recognize any of the video formats available. Read about the latest tuning technology, tuning techniques, motorsport wiring methods, engine building information. Maybe this will be corrected in the next software release. If you are using a pciii then go into the 0% column of the software and alter the fuel curve from 17505500rpm. Additionally, we have the signal from our wideband and fuel. The pcm shuts off fuel completely if the deceleration is very rapid, or for long periods such as long closed throttle coastdown. I assumed this was done to save fuel but in further reading, i have found that this is only somewhat of a fuel economy feature. Dfco deceleration fuel cut off tables while tuning, you want to disable dfco so your scanner does not pick up skewed data. I am aware and understand that a wide band reading would help me tune a lot better and accurately. This produces engine braking, which is where the vehicle slows down solely from the engine slowing down, rather than having to use the vehicle brakes.

Afr conditions under deceleration high performance academy. Nissan tuning guide uprev performance tuning software. Stored in the main memory chip prom is the software values programmed by gm or your custom tuner that tell the computer, among other things, how much fuel and spark to deliver to the engine for a given set of operating conditions. Disable o2 sensor fi code, o2 disconnected disable exhaust valve servo motor, removed disable pair valve, removed block off plate.

I want fuel to continue on deceleration to promote pops and bangs out the exhaust, as well as between shifts. I wanted just the opposite and had my tuner shut off deceleration timing or something. Check out turbo tim on our youtube going in depth step by step on. And then right before the car somes to a stop it seems like the engine braking goes away. Vehicles that range from stock form to your serious performance enthusiast can benefit from digitally tweaking and tuning one of the most important parts in the vehicle, its computer. Ive looked at the rpm areas but dont quite understand how that works. I dont understand what you mean by setting dfco more aggressively. In gm lingo its called deceleration fuel cut off and this helps both emissions and fuel economy as well as preventing that. It does what it suggest, cuts off fuel during deceleration.

And, concerning the fuel cut off, i happen to agree with the above post. So cruiseing along or letting up on the accelerator would mess with the timing whether one is idling or not. The basic formula is current maf value times k value bfs. You dont want to be compensating for poor fuel or air control with transient fuel. With a stock exhaust system, there is a degree of back.

This enhancement is a 1bar speed density enhancement for naturally aspirated applications only. I even went as far as disabling dfco deceleration fuel cut off in my 2012 tune because i hated the way it acted in certain situations like exiting the highway all to save such a small amount of fuel that i dont even notice the difference without it. With dfco, while the vehicle is decelerating or slowing down, fuel is automatically shut off to the cruzes ecotec engine. Jun 18, 2007 turning off dfco in hptuners tuning forum. Starlite diesel offers you the hp tuners vcm suite, the only tuning tool youll ever need for your newer gm, ford and dodge car or truck. Deceleration fuel cut off informational dodge challenger. Fuel sys, system, speedo and the tab containing all parameters for that key word will come up.

Theyre generally just cutting all cylinders based on pedalthrottle position thresholds, and recovering from fuel cut based on rpms. Aem series 2 part 10 takes a look at setting up and tuning acceleration enrichment and deceleration fuel cut off feature in the aem tuner software. Any suggestions on how i can handle a temporary rich deceleration situation. Hpt engine fuel control fuel cutoff deceleration fuel cut off enable temperature. Erm performance tuning interactive learning from tuning software training to custom tunes hp tuners dealer vcm suite free 2hr training session with purchase, credits and new version 2. After all, it is an oxygen sensor, not a fuel sensor. Oct 17, 2018 part 11 of the the hondata flashpro training course walks you through the drivebywire throttle control programming, as well as the deceleration fuel cut off. I would really like to be able to dial in the fuel map via computer efi software, but i dont see this feature supported in any of the literature.

I have retrofitted k8 electronics to my k1 and the throttle response is now really smooth. This is based off the pcm file from my 2000 pontiac formula. Uprev llc uprev nissan tuning guide page 4 of 14 k fuel multiplier. File open open an hpt or bin file close close the current hpt or bin file save saves over current file saveas will prompt you to save the file under a new name. I see that we still dont have tuneability of deceleration fuel cut off. When you are decelerating and the ecu cuts off the injectors to save fuel, why not keep the throttle fully open to also alleviate pumping losses. Click here to visit our frequently asked questions about html5. My friend has k6 600 and no more herky jerky either. The reason is because the computer will lean fueling during. Hp tuners latest generation of hardware and software offers the fastest. You do this by using scanning software and a program such as ls1 edit, etc. It is the name for those healthy gurgles and pops that you hear when shifting or decelerating.

Etv map set to open slower at beginning, engine braking adjusted. Hp tuned from pcmforless and bryan was able to eliminate alot of it through timing changes and cutting fuel from deacceleration. When making changes, always change the name of the file. Deceleration mode when the driver releases the accelerator pedal, airflow into the engine is reduced. Also, try temporarily disabling the decel fuel cutoff in fuel modifiers fuel control to determine if its at fault. Deceleration fuel cut off dfco why dont all cars fully.

Dfco deceleration fuel cut off, the purpose is to let some gas flow through the exhaust to keep the cats from overheating. Im sure this has been covered, but cant seem to find any info on it searching around. Fuel cut control dcel cut map is when the fitech cuts the fuel off under deceleration. I bought a 84 corvette back in 85, it had the crossram tbi it also had a dfco and when it engaged, the brake lights should have cut on, the thing acted like a jakebrake on a diesel.

Deceleration fuel cut off is a factory feature on many vehiclespcms. Hp tuners sd virtual ve setup and tuning chevrolet. Base fuel schedule is the theoretical pulse width that the ecu would have to run in order to maintain a 14. Deceleration fuel cut off dfco why dont all cars fully open the throttle valve under dfco. Tuning for this can be a little time consuming, and you should have a working knowledge of your car, tuning, hp tuners hardware software, etc before even attempting to do this. The fuel cut off during deceleration is of the adapted type. When i let off the throttle, the afr momentarily dips as low as 9. For example, if your motorcycle does not currently pop on deceleration, it is not. It will make huge lean spikes show up in the incumbent cells. The reason i ask is cause back when i had an srt4, the exhaust just sounded so badass with the loud rumble, popping, and gurggles when slowing down or letting off the accelerator. This program will be you basis for where, when and how much to change on the ve table. Originally posted by striker so what your saying is when the engine goes into dfco its actually cutting off the injectors totally.

Dfco, when it engages, do you just feel it, or do ya get a. So by eliminating the deceleration fuel cut off, were going to be having fuel and air pass through the combustion chamber and. When calibrating the ve tables, occasionally the table values will max out. Fuel map set with auto tune, ignition map adjusted for the lower rpms. The pcm looks at the corresponding changes in throttle position, manifold air pressure and mass airflow. When decelerating in gear, the map is very low, which means the fuel pulsewidths are very small. This article explains the core functions of the ecm. This package includes one demon unit pictured above and one software license for the neptune rtp software. It is also assumed that the reader is an experienced tuner.

In such a case, the fcv solenoid can be left deenergized and the rail pressure will remain at its previous set point without the fuel pump adding any additional fuel, thus saving pumping work. Deceleration fuel cut off will help to not skew your results when logging. Raise these values and the limiter will hit with less throttle and fuel cut drop. Gm engine fuel control fuel cutoff, dfco hp tuners. There is another step that should be added to this process to get accurate data and that is disabling deceleration fuel cut off or dcfo, reason being is that while driving the moment you let off the gas the chart will show you as being lean cause your afr drops to 19. Just click on the tabs within to locate the needed parameter. For the most part, this will work for just about every ls based engine vehicle. Download for windows now, xp through windows 10 download for mac os x now, up to 10. With up to 6 ignition outputs and up to 12 fuel outputs the omem710 is suitable for up to 12 cylinder engines. It is then up to the tuner to correct the calibration while on the engine. If the vehicle speed sensor is bad then this rpm limit. Deceleration fuel cutoff dfco dfco can be broken down into 5 main modes of operation. Once tuning is complete, put these settings back to stock, or modify them to your liking or needs.

This is a graphical tool used to record the ltft, stft process as it happens live. I tried the decel fuel cutoff, adjust the timing cells a bit on the table, nothing changed. I ended up reflashing the stock bin, and then copying tables over from the modified bin. Hp tuners interface rental remote tuning how to zzperformance. Coefficient used to filter engine acceleration, lower. Say i downshift into first and the deceleration of the motor starts at 4000 rpms. Inside youll find your tuning laptop, hptuners mp vi2, packing slip. I can hear the idle get a little erratic, until closed loop kicks in and brings it back to 14. Deceleration fuel cutoff and the herky jerky throttle. Buy range technology active fuel management disable device. Ensure the vcm editoreditenginefuel controlfuel cutoff, dfcorpm limitspn cutoff rpm is. Hp tuners starlite diesel custom tuning cummins, duramax.

Power enrichment table to the airfuel ratio you wish to command for your particular application. Causes and cures for popping on deceleration fix my hog. The reason is because the computer will lean fueling during deceleration with your foot off the throttle you dont want this normal behavior during logging because it will throw off the data values logged. If all that checks out then you can alter the fuel curve at closed throttle to help this problem. Lower the values and it will dump throttle lower and fuel cut more cylinders when the limiter first hits. The decel fuel cut option is the on off switch for the decel fuel features.

When snapping the throttle blades shut, the wbo2 sensor will read rich. I called holley tech support and they said no, id have to go one model up, to the terminator to get that. Gm says deceleration fuel cutoff in cruze increases fuel. I tried disable deceleration fuel cut, didnt much care for it. Tuning turbocharged engines tends to scare off a lot of novice tuners. Once dfco is enabled, obviously fuel is cut off and afr is what it is without any interaction of closed loop activities. Just pondering if there is anyway to disable fuel cut under deceleration as in no fuel cut on decel, just letting the remaining unburnt fuel exit out the back.