![]() ![]() By fitting a larger turbo we will lose some low down torque but we will get it back at higher RPM, which give us more power, without necessarily increasing stress on the engine. On a test drive they may feel fast but when you get used to the low down torque, exploring the upper reaches of the rpm range will reveal there is nothing less to give, the engine is being choked due to the small turbo. Vd engine displacement in cubic inches (convert liters to CI by multiplying 61.02. Generally turbos supplied by the car manufacturer are hopelessly undersized. These days turbochargers aren’t just for boosting horsepower. ![]() As many as 20 of the gasoline and 23 of the diesel engines on the road use a turbocharger. Find out which turbocharger is best with this calculator. Garrett has an excellent resource on their website detailing the technical aspects of a modern turbocharger OE Turbos Matching the right turbocharger to your engine means understanding the horsepower to airflow ratio. ![]() Video can’t be loaded because JavaScript is disabled: Turbo Size Calculator – How It Works () Too big an AR ratio will feel sluggish, too small engine can be difficult to drive smoothly. This is usually a trial and error process. This line absolutely lie to the right of the surge line on the compressor map.Ī steep surge line on a compressor map shows that a turbo will produce high boost pressure at low CFM flow rates.Ī shallow surge line on a compressor maps shows that a turbo will not produce high boost at low CFM flow rates. Then draw a line from this point down to Pressure Ratio of 1 and a CFM of 20% of the maximum. Plot the CFM number onto the compressor map graph. Surge LineĬhoose the RPM where you want to achieve full boost. Generally speaking erring on the larger size of turbo is better than smaller. We are looking for the line to be in the highest efficiency areas of the map for as long as possible. Plot multiple points to see where the turbo performs versus your requirements. Compressor Chartsīolt the pressure ratio number and the CFM (or lbs/min) number into a compressor map graph for various RPMs. When we obtain the pressure ratio and CFM and lbs/min numbers we can now look at turbo compressor maps to see which turbo will be most suitable for our application and goals. So, the number we chose is 1200.Turbo Size Calculator – Using the numbers Displacement (Liters) (122.04 CID) Ambient Air Temp (deg F) Altitude (ft above sea level) (14.502 psi barometric pressure) Fuel Type. But, since squirrel weight varies by season, and sometimes we see some really fat squirrels, and to come up with something a little easier to compute, we chose to round down to the nearest 100 squirrels. This gives us 1217 squirrels per horsepower. The Formula: Turbo Output Starting HP x ( (PSI/14. We could always use body mass to equivalate them, in which case 1hp ~= 1100sqp.īecause our completely different methods for computing Squirrelpower came up with surprisingly similar results, we decided to take our numbers and choose the average of the two. I don’t imagine many people have bothered to measure this. I don’t think we’re going to be able to generate an accurate squirrelpower figure :( Basically, I’ve not been able to find any data to indicate how much weight a squirrel can lift, pull, or carry. The 2021 Porsche Panamera Turbo S E-Hybrid is powered by a 4.0L Gasoline Engine, 8 Cylinder 32 Valve Gasoline Hybrid version engine and produces 563 hp and. So, based on body mass alone, Mark determined that: Unfortunately, he didn’t find the information I found about squirrels. So if we can figure out a meaningful measurement of weight over distance per unit time with a squirrel, we can totally translate it up. That’s 33,000 pounds times feet per minute, originating in the arrangement where horses were used with ropes and pulleys to lift rocks out of mine shafts – 330 lbs lifted 100 feet in one minute, or theorhetically feet or 3300 lbs 10 feet – you get the idea. We all know that 1hp = 746 watts, but the definition that’s going to be more useful for this conversion is 1hp = 33,000ft-lb/min. Here’s part of an email I got from him about squirrelpower: ![]() For those of you who don’t know Mark, he’s a geek. ![]()
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