installed bosch 044 inline pump, now problems
Many people are running well into the 30's and 40's on boost pressure. Now add in the fact that EVO stock base fuel pressure is 43.5psi and you have all but 90psi rail pressure. Add in the fact that Ted and I saw that a stockish line will add ~10-13psi pressure to move that amount through the lines and you get ~100psi at the pumps. It is also MUCH easier and cheaper to run a series pump setup and will not lose flow at higher pressures. It also ALLOWS higher pressures which will allow you to use smaller injectors which can help if you are close to maxxing the injector and dont want to jump up a size and deal with driveability issues. Dual wallys are a good solution. So is a series setup depending on the setup. Some people have to run higher pressures because they dont have a flow optimized setup but still want to make good power so high boost it is.
Flawed logic is assuming that one way is the only way and other options are stupid.
Flawed logic is assuming that one way is the only way and other options are stupid.
You are regurgitating flawed logic that I have already addressed by using an extreme example to validate the norm.
1. It's useless to look at line fuel pressure at 95psi and compare the performance of a fuel pump there to another. Why? The VAST MAJORITY of EVO/DSM owners never operate at 95psi line fuel pressure....including you. 34psi(boost) + 45psi(base) = 79psi. You are within the bell curve of most EVO gear heads and duals would outperform the series setup...even for you. That is my point!
2. Fuel pumps flow more at lower pressure so it's redundant to overtax your fuel system by using sky high base fuel pressure to compensate for what is the real problem....undersized injectors.
Like I said, in an optimum fuel line pressure operating range, no series setup will outperform dual parallel walbros. That's why it's the most popular setup for people who need more volume. This is using unmodified intank 255's too. Modified ones or external 392's will perform even much better. There is data to support these assertions.
1. It's useless to look at line fuel pressure at 95psi and compare the performance of a fuel pump there to another. Why? The VAST MAJORITY of EVO/DSM owners never operate at 95psi line fuel pressure....including you. 34psi(boost) + 45psi(base) = 79psi. You are within the bell curve of most EVO gear heads and duals would outperform the series setup...even for you. That is my point!
2. Fuel pumps flow more at lower pressure so it's redundant to overtax your fuel system by using sky high base fuel pressure to compensate for what is the real problem....undersized injectors.
Like I said, in an optimum fuel line pressure operating range, no series setup will outperform dual parallel walbros. That's why it's the most popular setup for people who need more volume. This is using unmodified intank 255's too. Modified ones or external 392's will perform even much better. There is data to support these assertions.
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