![]() ![]() I'm trying to size the right turbro for a conversion (never been turbo'd) for a straight 6, 12 cyl SOHC, with 3.5L. I wonder if the VNT or vanes part of it just doesn't last or needs constant work etc. Kits to rebuild it exist on ebay cheap enough, except for the VNT part and maybe getting the actuator to work wth it, I'm not sure. They seemed to work great from what I can gather is the problem durability? I have access to a rebuilt one and desperately want to know what the deal with 'em is. Was introduced for 1989 Shellby and seemed awesome, but then less than 3000 were made. Not only was turbolag basically eliminated, a wastegate is no longer necessary. Why no info or even mention of the Garrett GT25 VNT - stands for Variable Nozzle Tehcnology? Instead of a single injector, it has 12 vanes that go from 0-100% open. The best oil for any turbocharged bike or car is a fully synthetic oil 5w50 or similar, remember a turbocharger get very hot and needs a good oil to last. They are small and compact and are built good enough to last a long time on a turbo bike. These electric pumps can normally pump 8-12 liter/min water / Diesel and have been tested to work very well with oil for turbocharged bikes. You will find that these are more common use in boats and marine environments. If you can't find an aftermarket 12v oil pump you can get yourself an 12 volt electric water / Diesel pump to drain the oil. The easiest way to solve this is to get an 12 volt electric oil pump. Normally because of clearence issues (front wheel, fairings, radiator, intercooler, oil cooler and turbocharger along with pipes and hoses all need to fit in a very tight space) the oil outlet will often have to be mounted lower than the engine sump / oil pan and this will cause problems for the oil to return to the engine. The hard part is getting the turbocharger mounted high enough. Leo getting oil to the turbocharger on a motorcycle is the easy part and the oilflow and 4-5 bar pressure from the stock oilpump is enough. They will be of great help when looking at compressor maps Use the conversion tools And you will be able to calculate airflow, pressure and HP figures for the turbocharger you are interested in. I also have more technical pages for you that will come in handy. Also note that this formula only works one way. Because there are many factors that come into play. Now this will only give you an idea about the possible power you can get. ![]() This formula will calculate and give you the theoretical horsepower from the given turbo inducer size. Map sensors (Mainfold Absolute Pressure) usually use kPa so this formula show you how much it is in BAR ![]() Pressure Ratio (ATM+Boost) to Boost Pressure (PSI) Pressure Ratio (ATM+Boost) to Boost Pressure (BAR) The following formulas will calculate you're theoretical horsepower on the wheels (WHP) on E85 fuel for any given airflow. Lb/min to theoretical WHP on (Europe 98 Pump Gas)ĬFM to theoretical WHP on (Europe 98 Pump Gas) The following formulas will calculate you're theoretical horsepower on the wheels (WHP) on European 98 pump gas for any given airflow. Lb/min to theoretical WHP on (US 93 Pump Gas)ĬFM to theoretical WHP on (US 93 Pump Gas) The following formulas will calculate you're theoretical horsepower on the wheels (WHP) on ordinary 93 pump gas for any given airflow. These two formulas will give you an estimate of the theoretical engine HP you can expect from the given airflow. Keep in mind that some of these formulas are to give you estimates of what is theoretically possible to obtain. So these formulas will be of great help when reading turbocharger compressor maps. And also some custom made equations that calculate Airflow to HP and turbo inducer mm to HP and much more. I have made conversion tools for pressure ratio, that will come in handy if you are reading compressor maps. Type in 20 the PSI box and click with the mouse on the BAR box and you will get the value in BAR. Put in the value you want converted, like 20 PSI. But over the weeks I kept adding equations that are usefull. That's why I made this conversion table here for you. When dealing with turbochargers you always come accross alot of different units of measurement. ![]()
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