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Welcome To Mopar1973Man.Com LLC
We are privately owned, with access to a professional Diesel Mechanic, who can provide additional support for Dodge Ram Cummins Diesel vehicles. Many detailed information is FREE and available to read. However, in order to interact directly with our Diesel Mechanic, Michael, by phone, via zoom, or as the web-based option, Subscription Plans are offered that will enable these and other features. Go to the Subscription Page and Select a desired plan. At any time you wish to cancel the Subscription, click Subscription Page, select the 'Cancel' button, and it will be canceled. For your convenience, all subscriptions are on auto-renewal.
I got this formula off another site, but figured I'd toss it out here in case anyone else was looking at tuning either single turbos, or compounds...it's really more for balancing pressure ratios between compounds... Pressure Ratio is (atmospheric pressure + gauge pressure)\atmospheric pressureSo an example would be as follows (and I'm using my current setup as the example)Right now, my overall boost is maxing at about 55 psi, and the primary (atmospheric turbo) is maxing at 20 psi. Pressure Ratio is (atmospheric pressure + gauge pressure)\atmospheric pressure, then my two pressure ratios are as follows:(14.7+55)\14.7=4.74 overall Pressure Ratio(14.7+20)\14.7=2.36 Primary Pressure Ratio (PR)Then to reverse engineer the pressure ratio and boost of the secondary:overall PR\Primary PR=Secondary PR4.74/2.36=2.01 Secondary PR.then, reverse the original formula, so 2.01*14.7-14.7= 15 psi at the secondary. What this tells me is that with my current setup, my atmospheric (primary) charger is working harder than the secondary, which means I need my secondary to hold the wastegate closed longer, in order to get the secondary to spool more. Also you can see, the pressure ratios aren't quite matched up, which also shows the imbalance between the two, and the fact that my secondary is acting more as an airflow blockage, than anything else. (I really need to get my drive pressure gauge hooked up!)I just figured I'd toss this out there, for you guys to play with, in case anyone was curious. The atmospheric pressure is going to be different according to your location and elevation, so make sure you look it up where you do most of your driving, to get the most accurate numbers!