Hey guys, whats going on? I recently purchased my evo from a dealer and got a pretty good deal on it. The car has a Full 3" HKS Exhaust (Test Pipe), HKS Filter, and a manual boost controller, other than that it is bone stock (boost gauge). The boost was turned down fairly low so I went ahead and turned the boost up to around the stock level of 19-20psi or so i thought... I was driving along in 3rd gear and I hit right below 20psi on the gauge... Perfect I thought... Later in the day I tried out the boost in 1st and 2nd gear... got about 15psi.... So I tried 2nd from a roll... only about 15 psi... when I shifted to third out of second though boost immediately held steady at about 19 or 20 psi...

Does anyone know what the problem could be? I thought it might have something to do with the boost controller... But usually the problems with those are that they aren't holding boost correct? It makes no sense to me why i'd be getting 15 in 1st and 2nd and 20psi in 3rd and up... Can anyone tell me what I should look at under the hood or what it may be? Thanks in advance.

 

your fine man..The higher the gear, the more load you have on the engine. You will always boost lower in lower gears.

 

Thats good to hear... My main question now is... Can I get the car to hold 20 psi in first and second without it leaking (could something be connected wrong??) when I shift to third or is this a loosing battle??

 

Well, not "always" but generally, yes. And boost and load go hand in hand.

 

yes, get an avcr

 

will the apexi avcr really make that much of a difference? i have always heard that a manual boost controller should do the job fine.... Also.. If I have no interest in turning the boost up... could I uninstall the boost controller and then just let the car run stock boost.... Would it then be running 19-20 in the first two gears or do you believe it would stay like it is right now???

 

Was your car cold mine usually boost kinda low until it get to normal operating temps. Then is good to go. But in 1st and 2nd hits the factory levels with stock Ecu controlling boost.
One more thing check your air scoop sometimes if your missing the snaps it can suck up to the underside of the hood causing some boost problems.
Best of Luck!

 

If i take off the boost controller and run the lines back to stock config then reset the ecu.... Should I / Will I be hitting 19 or so psi in all gears?? or would taking off the boost controller not do this??

 

My car brand new from the dealer ran a little lower boost in 1st and 2nd. With a mbc, it is basically doing the same thing. 15-17 psi in 1st and 2nd and 19-20 psi in the rest of the gears. The mbc helps in that you can turn up the boost over 20 once you get the supporting mods and it should eliminate the boost taper in the upper rpms.

 

Thats how much i'm running stock. Does your car taper?

 

No, thats why it's surprising me.. in fact it's even slightly spiked at a few points... But yea I get around 15 or so in 1st and 2nd until redline.. and then in 3rd and up I'm getting right around 20psi right up until redline.... Very strange to me that the car isn't producing full boost in 2nd gear especially??? But you all are saying that other people have this issue as well and that's it's not something thats going to kill my power???.. Basically.. im not the only one with this issue??

 

I get Full boost( 21psi tapering to 20-19.5 psi) in 1,2,3,4 and 5th gear ? I have a Hallman mbc , hopes this helps

 

I have a Perrin mbc so maybe I need to switch to the Hallman to get to 20psi in 1st and 2nd.

 

would taking off the boost controller and returning lines to stock form possibly make me hit 19-20 in all gears?

 

Returning it to stock will possibly give you some boost taper and won't really raise your boost in the lower gears. I'm boosting around the same area you are and I don't even have a boost controller. I think its just the mbc, maybe you should try another one.