I just bought a Greddy boost controller and I would like to know What is the stock PSI on EVo's

 

on the 05's...anywhere from 20-21 tapering to 18

 

Thanks, and whats tapering?

 

when I installed the boost guage it was more like 19 with a tapper to 16. your boost will hit 19psi and then tapper to 16 and hold there.

 

So is the top boost 19 or 20-21 stock?

 

when the boost maxes out at a certain rpm, then the boost falls slightly to a sustained boost pressure. my '03 maxed at 19.5, then tapered to 16ish, before my reflash. now it stays at 22psi.

 

20 was the most i ever saw stock. Most of the time I would only do 19.

 

I thank you all for helping me.

 

I believe by the book the 2005's hit around 19.1 PSI and then drop off to around 16-16.5 at redline.

 

At what rpm does the boost hit 19 psi?

 

19 PSI on most stock evos

 

its like 20.13 stock, tapering to 17 i believe

 

My 05 boosts to 20.5 and tapers to 17 and has consistently since I bought it in March.

/ancker

 

All 05's that I have owned (MR and GSR) boosted to just a hair over 19PSI and tapered down to around the 16'ish range.

The factory gauge pack is not completely accurate as say a DEFI D-Series gauge.

 

Stock boost comes in at 19psi then drops to 17psi. Before you go cranking up the boost make sure you're using high enough octane fuel or else you move slower, even with a higher boost reading. It's been said in the forum that 20-21 psi should be the highest you should boost on pump gas. Do a search of past treads on this subject.