no no, air moves left to right through the IC, but right to left through the intake manifold.

 

Wouldn't this depend on whether one was sitting in the car or facing the engine?

 

haha yeh, sorry about that. That's if i'm facing the engine.

 

Conventional boost gauges, such as the Autometer electrical, may not give you the sort of accuracy you would like. When I switched from the Autometer boost gauge to the Defi Link System, I noticed that the Defi was about 1 psi lower than the Autometer. Furthermore, in my experience, there seemed to be more concordance between data from actual logging (beta Bim-Com) and the Defi when compared to the Autometer. I'd be interested to know the experience of others...

IMO, the pressure reading via the OBDII port might give a better and more accurate reflection of the actual boost at the manifold level. In addition, you'd be able to log lots of other important info, e.g., MAF and IAT, thus providing the opportunity for more careful, and presumably more meaningful, data analysis. Eyeballing a boost gauge in a rapidly accelerating car doesn't seem to be the best way to gather the type of data with the most meaning...

 

I totally agree..... this was not meant to be "clinical" but the bump from 16.5 to 18.5 was very noticeable to the eye even in a "RAC".....and curious....that is why I started the thread......not to present "scientific data." My car is almost a "mule" and like most mules it can be ornery, cantankerous, hard to get a long with ...... this is just part of that. At some point I plan to add some precision to my instruments (Sid and I are talking) thanks for your info...