OM606 compound small turbo size
OM606 compound small turbo size
I wanna run around 3bar boost, maybe a little more with as little epg as possible. Problem on compound setups seem to be egp. The balance of pr between hp und lp turbo will have to be chosen properly so that egp stays low.
reason for compounding is to stay in the efficient area of the comp map. It's difficult to find a large turbo providing over 60lb/min at 3bar boost with high efficiency. Second, this turbo will have some huge lag. The pressure ratios of the turbos are multiplied in a compound setup. In a real compound setup it's not neccessary to bypass the hp turbo. If u would do this, the smapper hp turbo would only be kind of boost assistance but the problem of working in an inefficient area of the lp compressor will stay... Let's say you build up about 1bar boost with the lp, it must have a pressure ratio of about 2.0. Then you will let the hp turbo also work in a pr of 2.0. PRs will be multiplicated and so u got pr 4.0 which means around 3bar boost, depending on some losses and compressor efficiency. There are many diesel compound calculators around. Just calculate the air demand of u'r engine and find a proper LP turbo. Then calculate the needed flow of the hp turbo. The pr of it do u know from the desired boost level u wanna run. After that find the right hp compressor whichs works efficient around this pr and flow.
I wanna run around 3bar boost, maybe a little more with as little epg as possible. Problem on compound setups seem to be egp. The balance of pr between hp und lp turbo will have to be chosen properly so that egp stays low.
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