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Awhile back, I came across a '94 NA Saab 9000. This year had the very long intake runners with ports which exactly match those of the '94 and newer 9000 2.3s turbos. I picked up the intake, intake cam, AIC valve,support struts, oil level tube, throttle body, and associated fasteners. I am a fan of Kevin Yankton's 9000 build and I was interested in somewhat duplicating his effort. There has been some discussion about problems associated with the long runners and the associated pulses which increases boost pressure at the intake in the 4000 RPM range. Evidently Kevin was able to get around this problem with tuning. Others have reported tuning for pulse problems and there is little evidence to support large horsepower gains. If one uses stock fasteners, its a pain working around this monster in the engine compartment. Having said that, I think it looks cool as hell. Its a visual impact thing. Personally, I think for those of us who enjoy mechanical things, building a hot-rod is something everyone should do once in a lifetime. This would be my attempt at a visually pleasing,different, performance specific car build although, for me, performance is not/should not be just horsepower. Lets say overall "goodness". Anyway to the question: Rather than approach the pulse problem with tuning using the plenum pressure value (possibly not correct for all RPMs) one treats the problem like an individual throttle body set up with pressure measured off the end of the individual intake runners. I was thinking about a small tube fitting at the end of each intake with hoses attached to a "vacuum" block so that the MAP value the sensor sees is the actual pressure value at that RPM. Then tuning for estimated pulsation effect is not required. Anyone here have experience or ideas about how to best pull together a clean pressure value with multiple intake pressures plumbed to a vacuum block or smaller plenum? Should I include the main plenum pressure input as part of the value?
->Posting last edited on Wed, 26 Aug 2015 02:47:59.
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