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In regards to ratios, I havnt seen a turbo that can spool reasonably for a street car not have higher Bp than map.
The only cars I've seen with anything close to a 1:1 are designed to make power high in the rpms and are very laggy otherwise.
Makes complete sense - the boring, universal law of reciprocity, as in impossible to get a stubborn donkey to move along without kicking it in the back.
Originally Posted by blown 944
I had the same thing with larger ts pipes. The back pressure was through the roof. It was foot to a point then took off...
Given that the turbine inlet area will always be smaller than the total area of all exhaust ports on the head, I could understand odd back pressure readings if the area of each scroll of a TS set up doesn't follow the same profile/rule of area reduction as designed for the stock cross pipe.
I ignore how you and Rod's set ups were dimensioned, but it sounds like you both increased scroll area while retaining the same turbine?
My large crossover pipes were the same size as the headers, there is no expansion area like on the stock set up.Even the large pipes drove a lot better than stock.
07-26-2012, 05:44 AM
