I just bought hp tuners pro for gm and ford, and i wanted to tune my. Sensor adjustments for altering fuel, ignition, and pwm duty cycle based on an analog input. The pcm therefore needs to close the loop and use the idle rpm error as a. There are many base calibrations provided with the software.
This is high due to the fact that the car isnt simply tuned for wide open throttle and sent off. Over the years, fellow tuners have made files to help others setup tables in hp tuners and they can be difficult to find. Download and open this hpt idle configuration in the vcm scanner. The vcm editoreditengineidlebase running airflowidle airflow vs. Gm tech 2 compare efi live and hp tuner auto diagnosis. Open the vcm scanner, do not worry about resetting the fuel trims they should. Download and open the a9l2 base calibration from the. The starting idle is linked to the ve tables as long as the front o2 sensors are not in use. It hunts from a deceleration, or whenever the car is in neutral and is moving. Ect table is like a software choke that is used to control. In closed loop, the main ways to affect fueling at idle are by using the ve tables for speed density and maf sensor tables. Sorry if this has been covered before but i could not find exactly what im looking for in a search. From there, you simply fire up the car or engine on a dyno and allow it to idle. How to addsubtract fuel for wide open throttle how to remove torque management how to remove c.
Disable closed loop at idle and part throttle by setting pe tps vs. How to setup and tune holleys dominator efi system part 1. Open loop is used when the o2 sensors are not warmed up, failed, or when an enrichment mode such as power enrichment is active. Open loop is the area of driving when the car is first started, and its length will depend on coolant temperature and elapsed time after startup. He could not for the life of god get my idle to stop hunting. When you go wot, the fueling scheme changes somewhat, and becomes a kind of mix between the closed loop and open loop modes. A wideband o2 sensor is required for the tuning described in these procedures. Set closed loop proportional o2 error to left to right. Hp tuners sd virtual ve setup and tuning chevrolet.
Speed density tuning using wideband o2 input hp tuners. With scanner open, command closed loop, disable ltft, and reset ltft trims, then go. Running in open loop will affect gas mileage and emissions. I hope this article is helpful to anyone interested. The computer will go back into open loop under a variety of conditions. Fuel trim download can be obtained atfuel trim download can be obtained at atechtraining com. Hp tuners, the home of vcm suite and the mpvi since 2003. You will also need to set the pe table to your desired open loop lambda targets so you can correctly tune the ve table.
Its my understanding that during open loop operation allow closed looplearning box not checked, the ecu fuels the system based on the base fuel flow rate table. Transcript hey guys its andre from high performance academy, welcome along to another one of our weekly webinars. Check for anything funky loping idle, explosions, kitten sounds, etc. Now go to the primary or secondary, if the pcm has it, ve table and drop about 36 counts off the idle area. Not too sure if this will fix my cold start but my idle is much cleaner and i no longer have a tip in issue by changing the b4006 min injector pulse width from 3. If they were modified in any way, download a stock tune for your car from, and use. Idle tuning the following is a collection of idle tuning notes, tips n tricks and how2s for idle tuning a big cam or any cam for that matter that i used when dialing in my 248254. Closeloop activationdeactivation settings and pid gains.
File connect this will ping the vehicle youve connected your cable to to attempt to. He said that he may have to tune the idle for open loop,rpms 1200 and below, because of the cam. 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. By disabling these sensors, or by increasing the closed loop enable coolant temp to 90. So we can see that as the rpm increases, were going to switch into power enrichment sooner. Unlike gen 3 idle tuning, start with a warmed up engine. Fuel trim download can be obtained atfuel trim download can be. When that tp is reached, and the car goes open loop, and richens up. The dominator determines the best idle airfuel ratio in a matter of a few seconds. Ive installed a stg 4 turbo cam from zzp, with 6 springs, bigger valves, pnp heads. Running pure open loop with around a 16 afr at idle on my wideband the car will come to a stop and idle perfectly. If you choose to follow any of these how2s, please do so at your own risk. Tuning 101 tuning for dummies plus krambos idle tuning tips.
Since fuel injector clinic had also provided us with the option of using their smaller 1,650 ccmin injectors for our evo x, we opted to stick with those. The beauty of driving at stoich, in close loop operation, protected by those fuel trims that are now super close to zero if theyre not, time to be less scared, and start doing what you should, since you have the tool in your hands then all sudden, the rush to put the pedal to the metal, engine operating mode change to open loop, maf gets. We take a step by step approach introducing more concepts and techniques with each video to illustrate not only how the gm ecu works, but how to read live data and make accurate changes. This is another useful feature for professional tuners or people that tune more than one vehicle. Ect table is like a software choke that is used to control the mixture at idle when the engine is in open loop. It allows specific parameters tables, settings, curves, etc. If you are a beginner just stick with hp tuner, its simple and straight forward. Thundermax ecm with autotune closed loop system mozaic. There are parameters in the computer that determine what the tp is for open loop, and other things. Open and closed loop the vcm fueling generally operates in one of three modes. Force open loop just at idle what id like to do is keep the vehicle in open loop at idle say to about 1,200 rpm, then closed loop above that rpm. There are two main things to adjust for closedloop idle.
A description of each config file can be seen in the notes field by single clicking on the icon 5. It controls afr by opening or closing the throttle blade slightly to meet. It allows you to connect to the ecu through the obd diagnostic port underneath your steering wheel and edit the values and tables inside your ecu also more commonly called a vcm by the hpt crew, and basically tune your car to the mods that you have. Speed density tuning using wideband o2 input by william henn, foff667 speed density tuning using wideband o2 input. Open loop fuel system statusopen loop fuel system status due to fault status with all the. Dec 12, 2012 open loop and closed loop are two terms used to describe the fueling mode the computer is in. Welcome to efi tuning with hp tuners tutorial introduction gm. Finally well look at the hardware module itself and how to connect your wideband o2 sensor to the hptuners module.
To rectify this, enter closed loop parameters and set the enable rpm to enter closed loop high enough to ignore this condition. I know i had, and still have lots of trouble going through my tunes and getting the car to do exactly what i want it to do because i was not 100%. I want to make a data base available for people to read about regarding what everything means in hp tuners while you are tuning. Open loop vs closed loop holley performance products. Head pipes must be modified to accept 18mm sensors if they dont already. Guys, here is the procedure i have been following when idle tuning an ls2 car with cam or whatever upgrades that warrant having to fix the idle. The ecm is a simple computer that runs software programs.
And i cant seem to get my commanded afr to stay at 14. Regarding the open loopclose loop differences during operation. Set up open loop speed density ve tables can be tricky to setup from the start but a general guideline would be on a mild bolt on car leave it stock to start out. Welcome to efi tuning with hp tuners tutorial introduction. First and foremost, download your stock or whatever calibration you have and back it up.
Gen iii speed density ve table and maf tuning instructions with a wideband o2 sensor create by 69lt1bird jeff anderson 4 connect your vehicle to hp tuners. Id like however to run open loop with stfts except in the 4001,200 rpm range where i want it to be open loop without trims. If you are a little more comfortable with lots of open windows and plenty of alterations then go with the efilive. The vcm fueling generally operates in one of three modes. And basically, theres a bit of information here but the two key aspects were interested in is weve got this table here that defines the throttle position versus rpm, where the engine control module will switch from closed loop to open loop operation.
For example at 800 rpm and 30 kpa idle what afr do you want. Youll find a decent cam will reduce ve in the idle region up to perhaps 25003000 rpm. I think that this would only resolve your issue in open loop correct. Idle tuningreally only need to do this if you have installed a cam.
What id like to do is keep the vehicle in open loop at idle say to about 1,200 rpm, then closed loop above that rpm. How to fix gm open loop fuel system fault using hp tuners 4. This course will teach you a stepbystep tuning process for ford gas vehicles with the following. Increase base spark in idle cells doesnt mean to entire table to at least 25 35, for big cams, for small cams, add 35 to entire idle spark table. Hp tuners gm gen iv training course evans performance. Find at what kpa and rpm your engine idles and correlate those values to the nearest cells in the ve table for example, a stock m6 engine will be 30kpa and 800rpm.
As expected, the 2,150 ccmin injectors were far too large for our 2. Finally, plug the hp tuners cable back up to the obdii port and flash in the custom tune. Is there anyway to trick it into open loop at idle. If you performed steps properly and your engine is able to idle smoothly, goose the throttle while at idle and note what your engine does. Nov 28, 2008 idle tuning the following is a collection of idle tuning notes, tips n tricks and how2s for idle tuning a big cam or any cam for that matter that i used when dialing in my 248254. To work out what pulse width gives you what engine rpm requires testing to find out. Hp tuners gm gen iv training course starts with the basics of downloading and installing the software. You are able to edit fueling, timing, power enrichment pe, idle, closed loop, speed and rev limiters, transmission settings, and dtc settings and parameters. This will eliminate all torque management within the pcm. Idle adjustments for idle speed, idle speed vs ect, and idle ignition corrections. 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.
The most comprehensive hp tuners guide ive ever seen. Idle idle rpm idle airflow airflow general airflow dynamic airflow. How to do a complete open loop ve tune using hptuners part 2. How to download gen iiiiv config files for hp tuners 3. When engine loads are highest, the mixture density inside the combustion chamber is also greatest.
This article will give you a quick overview on how to set it up and what you can do with it. To get access to the beta you should email hp tuners tech support email and they will add it to your customer area so that you can download it. Hp tuners gm gen iv training course evans performance academy. The thundermax ecm with autotune module mounts conveniently in place of the factory ecm and plugs in to the existing harness. This a very basic guide where youll learn how to adjust your idlepart throttle fueling. The engine revs up and then decelerates toward idle smoothly and steadily and returns to the target idle without overshooting or undershooting the target idle. Whereas with the 1,650 ccmin being a smaller unit, they can be ran in closed loop and with the pulse width adder table set up properly they even behave similar to injectors half their. Without the allow learn box being checked, the wbo2 sensor feedback is not figured into the equation and the afr is not adjusted by the ecu.
Wideopen throttle spark conditions are especially prone to misfire. Hp tuners is one of the most powerful tuning platforms available for gm vehicles. When you stomp on the gas, most of you know the pcm commands wot, or wide open throttle, operation. Thundermax ecm with autotune closed loop system mozaic racing. This condition is governed by throttle position and varies based on rpm. The first step in tuning your own mustang with hp tuners is to make sure you have downloaded and installed the latest beta release of the software. Fuel delivery in the wot tuning process remains consistent with the model used at medium and low loads. It utilizes wideband o2 sensors and works as a closedloop control system to continuously selfadjust and properly tune the motorcycles air. Special thanks goes out to ws7 on idle limiters go to edit engine idle idle rpm target idle speed vs ect idle speed. Ford gas tuning hp tuners level 1 beginnerintermediate course. He said that he is puzzled as he never had this problem, even tuning larger cams. During misfire, the spark event simply never sets off the chain reaction that creates power. 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. Go to flash read entire and copy your stock tune and save t a different folder than you work in so the file does not get overwritten.
Its abandoning the o2 sensors, abandoning the maf and abandoning any sort of feedback that the cars relied on so far. The airflow model must now be adjusted in the upper range to match actual mass flow through the engine. By increasing the values in this table, less fuel will be used before closed loop o2 sensor feedback is entered. Guys, i had my car tuned by a very good local tuner. I have posted them here, on my site, and i will add more as they become available for you to use for free. Tuning high flowing injectors for low pulse width operation. Thundermax requires the use of an exhaust system with 18mm sensor bungs.
We also include processes for injector data entry, idle, maf tuning, part. Open loop fuel system statusopen loop fuel system status. If youre using hptuners the default histogram setup is fine and will give you all of the data logging. There are other tables that can be edited, but this list is just to give you an idea. Now this week were going to be looking at the topic of speed density tuning on the gm platform, were going to be using hp tuners for our demonstration today. To rectify this, enter closed loop parameters and set the enable rpm to enter closed loop. Professional romraider tuner directory open source ecu tools. Its time to set everything manually because thats how you get the stability and control that you could never hope to achieve using closed loop. Gen iii speed density ve table and maf tuning instructions with a wideband o2 sensor create by 69lt1bird jeff anderson 1 these instructions are written for the beginner and intermediate user of hp tuners software. Do you know if this procedure would work for vortec idle tuning.
The car is first set up on the street, all idle and closed loop areas tuned, then wot on the dyno, then back to the streets to varify wot and do any final touch ups, such as fuel economy, closed loop, tipin, etc. Hp tuners help asap on quickest way to tune fuel trims. Fire up the vcm scanner and datalog to ensure everything looks good. Under idle, idle airflow, base running airflow, zero out the entire airflow final minimum table.
How to tune your mustang using hp tuners modular fords. So it makes it really easy for the tuning because when were in closed loop mode. To start off the settings that dictate when closeloop. This article explains the core functions of the ecm. In a follow up article i will explain in detail how to use the vcm scanner to datalog and make changes to the tune based on the logs. Gen iii speed density ve table and maf tuning instructions. How to do advanced open loop tuning using hptuners. How to do advanced openloop tuning using hptuners axleaddict. Openloop should be set up so that the lower the coolant temperature the higher the idle. I am working with a 99 astro van with a 99 suburban 350 tune and a ht383e replacement.
137 1675 1502 397 660 773 1586 58 1093 417 1150 937 824 440 1447 782 473 1220 1509 1176 346 156 176 1493 513 626 124 1441 1484 877 1136 825