Originally Posted by
blackpepper
I used the boost gauge also on torque now the boost i am weary about but a boost gauge was install and remove and the both torque and the boost gauge was very close 19.5 on gauge 19.7/20 on torque on a 30 degree night 19.1 on a 70 degree day,and this is with a 17lb pulley which appears odd.I do after the nw manifold dcai and high flow filters.
Yes I'm stock 74/155 - supposedly 14.5psi MAP out of the box 12 years and 80k miles ago (when new).
After seeing the previous graph I posted, I don't have a problem with the TorquePro MAP readings - 14.5psi at 5,861rpm WOT. A Little surprising after all those years of use.
They are after all, readings coming from the ECU, whereas an aftermarket boost gauge is another entity all together. As long as the MAP instrument itself is okay - readings should be okay - me thinks.
I'm happy.
Aside - the swings in Mani psi observed also lends question to the Accordion Effect provided by the coolant systems expansion/contraction and it's implied stress on the walls of the intercooler. The unavoidable mani pressure swings shown here are as large, if not larger than those, and much more frequent.