My 04 has the stock Eaton with a 2.8 pulley, CAI, magnaflow cat-back, and Bama tune. I have a Speed Hut boost gauge with recal and my max boost has been 13.5 psi. Which according to the pulley advertisement is right were I should be, it claims a 4-6 psi increase. The only change since that max boost is a Magnaflow X pipe with race cats. Had the car out today and made a solid third gear pull. When I got home and checked max boost it was 16 psi. Did I gain 2.5 psi with the x pipe or are these gauges not so reliable or is something else going on?
Sudden boost increase?
- Thread starter ILLBEBK04
- Start date
Never used that gauge before but if you really did go up in boost means that for what ever reason your engine isn't breathing as well as it was.
ok, this is my first forced induction car. I assuming with an increase in boost I'm pushing more air into the cylinders. Or, are you saying the increase in boost is a result of more back pressure in the exhaust system?
Did you buy the x pipe new? If not the cats could be clogged
Bought it new. The car doesn't feel any slower. If anything it feels like it revs quicker when in neutral.
Is the car driven daily?
No, once or twice a week but a lot less lately due to the weather.
was just curious since you could be seeing more boost due to the cold/dense air, but 2.5psi seems to be quite a bit of an increase just due to the cold/dense air.
Agreed. At that boost level, a 1-1.5 psi swing is more likely due to varying air density, assuming no great change in elevation.
Ive seen a 2psi swing between the heat of summer and the cold of winter. Where in Pa are you located OP?
About 35 minutes north of Philly in Montgomery county. So it was probably the difference in temperature between the runs. It was way colder on the 16 psi run.
Id say so. This 5deg BS is BS. :rolling:
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