size should be very close to correct.
you plan on turbocharging a motor; it is really an intake tract //--> All of these vehicles are covered in the tech, maintenance and repair articles found above. HP estimate shown. Calculate air flow, smaller turbo size, and larger turbo size. Below are just a few of the articles found here on enginebasics.com. Learn more about Engine Air Amount Calculator "); Do not quote these values to your Now that we have talked a little about the pro’s and con’s of each let’s talk about why picking the smallest turbo for our power goals isn’t necessarily the end all advice to turbocharger sizing. Since we need a specific example to talk about let’s go with a mid size turbo and a mid size motor like a 3.0 Liter Toyota Supra motor (2jz). If we say our goal is say 650 wheel horsepower, then we would be looking for a turbo that can flow upwards of 60 lbs/min of air. Strong choices would be a Garrett GT35R or GTX35R, or a Precision 6262, or a Borg Warner S362. We go to the dyno and continue turning up the boost pressure till we hit our 650 HP goal. We eventually do meet our goal of 650whp but we had to run such high boost pressure to reach that goal, that race gas was required. Now this power can only be had if the owner is willing to grab his wallet for $9 dollar a gallon race gas in the tank. A bonus though of running such high boost and hitting high boost low in the RPM band was we made tons of torque too. We made 650 HP and 650 Torque. How exciting, but then our engine builder told us that making that much torque will most likely bend our stock rods and beat on our bearings a lot more. To fix this we need to be grabbing for our wallet once again and have the motor fully built with forged parts. Well the owner empties his wallet and hits the street. 1st gear the owner stabs the throttle and the turbo lights right up and so does the tires, so they shift to 2nd but the torque comes on so rapidly with the little turbo and so low in the rpm band that again the tires light right up again. They now back out of the peddle so the torque drops and traction can be found right around 5000 rpm where they are able to get back into the go peddle but are then unsatisfied as they can feel the engine torque falling off as the small turbo’s turbine wheel is too much of a restriction at high engine RPM. Also they think to themselves that if they wanted to wait till 5000 RPM to get into the go peddle they would have just bought a larger turbo. This is really not a "turbo" calculator, although it does have features that allow you to select a properly sized compressor if you plan on turbocharging a motor; it is really an intake tract simulator, performing thermodynamic analysis of the intake flow and approximating how much torque can be expected given some numbers that characterize the other efficiencies of the motor. ±20% or more. See you even inject small quantities on a very humid day). look at the difference in HP values. value correctly to compensate). Boost Adviser. In 1st gear the turbo is lazy so not much boost pressure is made, but the car is still very quick since traction is maintained and a 3.0L naturally aspirated motor is still very peppy. 2nd gear comes and the larger turbo spools a lot more linear and comes up much later in the RPM with less torque so that again, traction is maintained pretty well. engine configurations and important parameters. Thanks to Nate Stuart and Marc Swanson for integrating as the Y-axis (vertical) coordinate on a pressure map. simulator, performing thermodynamic analysis of the intake flow This helps you select the right size turbo. you do have an intercooler the injector should be last; guessing at the VE, SFC, AFR and cetera, so unless you should record the setting only when you have a maximum Match a Turbocharger to suit your engine.
Usually maintain torque all the way to redline. maximum injector duty cycle values that you enter.
(With a little bit of thought you will see why when you The compressor map calculation can be used to fine-tune the turbocharger sizing recommendation. injector size you should use. The water injection system modeled here allows you to or save it and come back to that same configuration later. LBM is much more accurate because it takes into account your browser. You need to make educated guesses on three significant you attempt to inject large quantities of liquid (or if IC parameters to zero. Any boosted or non-boosted motor can have an intercooler Peace” Jay R. Copyright 2010 EngineBasics.com: Engine Basics. Torque falls in the upper RPM of the power band. You can often shorten the link line up by deleting parameters Physically larger, therefor can be harder to install in a given space. select the location for the injector: before the compressor Info from every other site I looked at, only said how to do it using costly special tools.
We do the math and sort the turbochargers to only those turbos that most closely meet your needs. Laggy. Meaning the time till the second boosted torque curve over the N/A torque curve takes time to obtain. pressure drop across the intercooler. Water dropping well below the ambient temperature, then you are size is estimated for the displayed configuration, so you
have no intercooler, the injector should be first; when features that allow you to select a properly sized compressor if Let us be the class 101 for your automotive learning. on your own faulty data! document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); So you have decided to turbocharge your car or upgrade your existing turbo, but are stuck on what size of turbo would be right for you. It would be nice if turbocharging was like many other decisions where bigger is better, but not so. While 90% of the internet would tell you to pick the smallest turbocharger that meets your horsepower goals I would like to offer a different point of view after we go over the pro’s and con’s of each. How Engine Air Amount Calculator works. Large turbine wheels allow good flow for better volumetric efficiency and less exhaust gas reversion, which helps in avoiding cylinder detonation and pre-ignition.
Free Software: Contact Us. in no cases does it make sense to inject between the turbo MotorGeeks. need larger injectors than these tables show! the field names in the input form are links to the appropriate Note that injector numbers that characterize the other efficiencies of the motor. ignored (it is assumed that you will tune the SFC Introduction: The purpose of this little paper is to show the reader how to calculate the volume and mass of air moving through his engine, and how to size a turbochargers' compressor to move that quantity of air. that are not useful, or have default values. google_ad_width = 160; **TO SUBMIT AN ARTICLE TO ENGINE BASICS PLEASE CLICK: CONTACT US! All Rights Reserved, For the latest Automotive news and stories visit the websites below. So which set-up is better? Well if money was infinite and traction was infinite than the smallest turbo to reach your HP goal wins hands down.  Better response, more torque, and with infinite traction it would put car lengths on the larger turbo car till the larger turbo cars boost came in, and also would be much more responsive and fun to drive. BUT, in the real world where money matters, and traction is a big problem, which one is better? TF Electronics: AutoSim: AstroTel. Turbocharger Facts : Picture Of Workshop. "https://ssl." Now let’s do the same scenario with a large turbo. The owner has the same goal of 650hp, but chooses to go with a larger turbo like a Garrett GTX40/88r or 6766 or Borg Warner S366. These turbo’s are all rated at 80+ lbs/min of airflow and will flow enough to make 800+ wheel HP. With the same goal of 650 whp the owner hits the dyno and is able to make 650 whp on pump gas do to the fact that not much boost pressure is required to get the large compressor and turbine wheel to flow enough air to make 650 HP. The owner is excited that he can make this power with cheap pump gas and enjoy that power daily. The dyno operator than says that power is 650 whp, but because they didn’t turn up the boost pressure very high and because the turbo didn’t spool up till later in the RPM where the motors volumetric efficiency was decreasing, the engine only made 575 ft/lbs of torque, but it was able to hold this torque almost all the way out to redline. The owner would have liked to make more torque, since more is better, but then the engine builder lets the owner know that since the motor didn’t make more than 600 ft/lbs or torque he would likely be fine running the stock rods and pistons, and that a built motor is not required. With this news the owner celebrates and leaves his wallet in his back pocket. Next the car takes to the street. in driving the compressor, but are otherwise the same. considered here; all combustion-related effects are It is not always easy to know the best size turbo to use for a new application. Injection Thermodynamics for the gory details. Turbocharged Cars. Some tables show injector a higher SFC than turbo motors due to parasitic losses google_ad_slot = "8559594271"; the turbo map plotter into the calculator, this really is Injector size is computed directly from the SFC, AFR and Calculate air flow, smaller turbo size, and larger turbo size.   The owner shifts to 3rd and traction is all there and so is the turbo. What is nice is the larger turbo pulls hard all the way to redline. quantities, then the estimated results will be correspondingly Speed-Wiz can provide a ballpark estimate for turbo sizing. If you see the post-injection temperature ("Temp out WI") Note that only the thermodynamic effects they are not real numbers. ?â¦â¦there is no right answer. See the glossary for more Note also that this is the actual (horizontal) coordinate, but some use the CFM flow value. Remember that you are merely numbers for this calculator: If you have grossly bad values for any of these three detailed descriptions of various parameters (notice that most of For an NA motor, just set the boost to zero and set the Other values such as turbo and IC efficiency are not /* 160 x 600 for right column */
Since we need a specific example to talk about let’s go with a mid size turbo and a mid size motor like a 3.0 Liter Toyota Supra motor (2jz). a huge leap forward in functionality for this thing.
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