When Richard Holdener does testing you can always count on lots of info, lots of laughs, and big numbers. After all, he runs more engines than anyone on the dyno, and he’s not afraid to test stuff to get real data. So what about the cheap EBay turbos that you can get? Do you need one or two? Well some of that depends on what engine you are putting them on, but in this particular case he’s using a big block Chevrolet to show how both setups work and what some of the difference are that you should care about. We all talk about boost, but what about back pressure? They have more in common than just psi, so this is something you are going to want to pay attention to.
We find the correlation between the two to be pretty interesting data and also how the engine itself responds because of it. This is a test that will give you real food for though when considering what combination is right for your engine. They can both make power, and one isn’t more right than the other, but in this application there is a clear winner and a clear reason. Watch the video below to understand what the differences really are and why you should care.