how to turn off throttlestop

 

Throttles and Setting Up ITB Mode

This is Abdul from how efi works calm and today I'd like to righting about Elsa in tuning ITB or independent auto bodies in ITB mode setup this is a typical ITB setup which stands for independent throttle bodies you can see the ITB s at the bottom just below the orange couplers at the very bottom of your screen is the air filter in this case is probably a foam air filter independent throttle bodies are very Popular in the motorcycles from from Japan Kawasaki Honda's Yamahas they are virtually always used for these high-performance motors and we will get into why this is this is a side view from a different motor just as this being mocked up to go into a race car chassis you can see the air filters on the left the ITB throttle bodies in the middle with the fuel rail coming in from the top the home-built intake manifold is on the Right you can see where I took a stock intake manifold cut it off in the Bridgeport and weld it in four aluminum tubes to mount the ITB s notice that the ITBS are rubber mounted and we'll get into later why I do this this is a typical ITB setup off of a motorcycle this happens to be the engine side at the top you see the fuel rails and the four brown injectors the hose across the front it's about a quarter inch hose Maybe that is where the map signal is sampled by the ECU you can see that we bridge all for independence rattle bodies to get one map signal back to the ECU this is the other side of the ITV's you will see a second set of throttles very commonly in the motorcycle world what it is is a set of throttles used to limit horsepower in the lower gears often used for traction control or wheelie control on the left you see the actuator motor Or the stepper motor that controls those this is the in view of the same set of ITV's notice that there's actually two sets of injectors the brown ones that are used for low power on the right side or the gray set that's used for full throttle their upstream of the throttle bodies that controls the traction control on the right side right here is the throttle position sensor used for the secondary throttles and this is the TPS or throttle position sensor used for The main set of throttles to control the motor most of the time at the top you'll see the two fuel rails one for the primary injectors one for the secondary injectors so this is our standard engine what I've got in yellow or the primary sensors used for ITB tuning they are the Baro sensor on the lower left the TPS used for high-power tuning the map sensor or manifold air pressure manifold absolute pressure and the manifold air temperature sensor at the bottom is the Crankshaft position sensor and in the center of your screen is the coolant sensor used for warm up notice in the top right I've got a note speed density is used below about 90 kPa and alpha n tuning is used above 90 kPa speed density is using the manifold air pressure and manifold air temperature to basically calculate the density of the air in the intake and alpha in tuning is when you use the throttle position sensor and the engine rpm to estimate The fueling requirements of the motor so what I've done now is zoomed in and notice the red arrow in the middle of the intake manifold what it is is the tuned length of the intake when the motor is running at very low throttle what's going on here is a motor is essentially a pipe organ and if you look in the internet Google pipe organ theory and what you find out is there's closed in pipe organs in open end pipe organs when the motor is it's low throttle the Resonant length of the intake is essentially from the backside of the throttle plates to the bottom of the intake valve now let's look at the tuned link when the throttle plates are fully open we are now working as an opening pipe organ this is the primary reason why an ATV motor behaves very differently than any other motor if I open mega log viewer HD and I go to calculated fields optional fields of the first screen is map times rpm if you Turn that on and you will get a pop-up that it wants to reload the software go ahead and do that what we get if we open in histogram view of a normal motor you will notice on the right side right in this area how you get a very gradual change from blue low volumetric efficiencies up to about 110 biometric efficiency with a very gradual change in colors this is very typical of a motor that wants to be tuned in speed density ITB tuning is Just not required in this sort of motor this motor would be just like 99% of the motors out there if we open up the same motor in Skinner plot view would you'll see is I've got plotted along the bottom rpm manifold air pressure up the left side and volumetric efficiency out in the field in color and that same motor you can see a very gradual gradient fry our change in colors from Blues in the lower left up to a bright orange or red in the top-right corner on the right Side I've plotted map times rpm first duty cycle and volumetric efficiency in the color notice the color is the same on both sides and on the right plot you have a relatively straight line where any given map times rpm gives you a very distinct duty cycle in the center we have something going on here which is this intake manifold has some sort of resonance going on that means we have a change in fueling over a short period of Time but for the most part any given rpm and map will give you a duty cycle now what I've done is taken a motor that is an ADB motor this motor has a huge variation as you come up through the manifold air pressure this is again histogram view which is done with mega log of your HD it does take the registered version but if you notice we're running sixty percent duty cycles all the way up the right side and then all of a sudden we get to these huge Numbers look through the meat of the the tune its 6,500 rpm we get that same effect we have a relatively gradual rise in volumetric efficiency and then all of a sudden we get this cliff of volumetric efficiency a motor like that will be very difficult to tune in speed density and is going to take I TB mode or TPS based tuning to turn it in if we look in Skinner plot view it even becomes more apparent notice how I have a fairly gradual change in color and then all of A sudden at the full throttle area I get a huge jump in volumetric efficiency if I plot map times rpm first duty cycle and volumetric efficiency again the colors are the same on both sides look how I get a huge increase I no longer have that straight line function that I had on the other motor you get a huge increase in the amount of fuel this motor once as the throttle position comes greater and greater this is the signature of an ITB motor and when you Try to tune it in speed density it gets almost impossible to do a great tune on it so now I'm going to give an example of how to set all this up called ITB mode in the mega sort world if you go to basic load settings and then hit general settings the next thing that pops up is a screen that normally in the top right corner you would be set to speed density I'm going to hit the the tag down box and come down to ITB once you do that a new option comes up under basic load Settings it's no longer grayed out called ITB load settings the first thing we need to notice is down at the bottom right corner notes 1 2 3 & 4 they are very important what I want to do is validate that the throttle position sensor map sensor and Baro sensor reads correctly for your setup number 2 and you have to set these in this order is set the percent Baro switch point that is the 90 on the left configure the left curve from data logs and we'll show you That in a minute and on the right side by default leave that plot alone I can show you later what that's doing so now let's set up this graph on the upper left corner notice that we're actually percent barrel I'm going to make the assumptions that you're somewhere near sea level and percent barrel 90 means 90 kPa what I want to do is go into open mega log viewer and what need is a very big log coming off your motor not somebody else's off of your Motor that we can write a filter against I'm going to do is create by going to new data filter and type in Barrow switch curve this one's already been set up so I'm in edit mode at this point and I'm going to write the formula open brackets map close square bracket is greater than 92 or map is less than 88 basically what it does is throws out all data where the manifold air pressure is greater than 92 and the map is less than 88 so all we get are the numbers around 90 kPa I also want to throw out in the mega skort world engine greater than 1 basically the motor is running relatively steady state so if I apply that filter and open up the histogram view what I get is at 2000 rpm it takes about now 12% throttle notice by the way that I have a very tight pattern on TPS opening up to a hundred percent throttle notice how these are spread fairly wide I'm jumping by 15% throttle settings in the upper left and at the bottom I'm Jumping by one in two percent trottle in the field what we're looking at is the average of the data that came up after we applied our filter and you can see that it relatively high rpm 6000 and above it takes about 30% throttle to get to 90 kPa in the mid-range say 4000rpm it takes around 20% throttle and a 2000 rpm you can get 290 kPa at 15% throttle supply this to our plot on the upper left what I've done you can't get to this Screenshot normally with your computer what I did is cut paste but I have my curve that we developed at the bottom on the upper left corner I've set a fairly smooth curve that's using the same numbers if you look up around 5,000 rpm I've got it set right here to about 35 do your best to get the two curves to essentially be the same on the right side I've left that plot has the default if you notice it's set to 50% across the board That what this means is that this rpm about 50% of your toon sells in tuner studio will be dedicated to speed density on the bottom and about 50% of yourselves above the switch point will be dedicated to alpha n mode this happens to be the setup I use on my motor my motor is a dedicated race car so what I do is at low rpm in this area of the plot I'm using about 80% of my cells to tune speed density but once I get on track I use about 80% of my cells To tune the alpha end section note that if you do this trick it will become a little difficult to get a smooth transition from speed density up into ITB mode so we normally advise to not take this option what I want to point out this is our air filter side of the ITV's and notice how the factory has made this a very solid assembly from left to right it's all bolted together in aluminum ITBS are very critical to thinking of all four throttles coming Open at the same time what are the problems I see in ITB setups is on the v8 installs what happens is you have this big aluminum intake manifold sitting on a motor that this thing wants to essentially change size as the aluminum expands with heat the throttle assembly has difficulty having exactly the same angle as the motor warms up what we end up with is extreme tunability issues you just can't get all eight throttles to be at exactly The same manifold air pressure at very slight throttle positions as the motor comes up on the power the difference between 80% throttle and 85% throttle is just not that sensitive but boy at the bottom end it is a fight to get these motors you can get it to idle fairly well and run fairly well when the motor is cold but things just changes the motor warms up but it is an absolutely beautiful setup you'll also notice on the bottom right corner this really is a Early Corvette barn-find still running a generator the EFI is all hidden underneath this thing so it still looks vintage but it is running an MS 3 I would like to thank my friends at tuner studio.com that the developers of mega log viewer HD that we're using to generate all these plots and the guys the right to nurse to do the software we use to tune these motors the guy is a DIY auto tune the supply all the parts and pieces we use to wear these cars Plus the amp EFI series of ECU's and m/s extra calm thank you for reading