I hear that a IX should hit 20.3 3500rpm and tapers to 17psi by 6500rpm. My MR is still stock and I been the only owner but i have never been close to 1.4 bar (20.3 PSI). Now that its getting colder i mite hit 1.28 bar (18.5 PSI)and taper to 1.13-1.18 bar (16.3-17.1 PSI). In the summer months 1.21-1.23 bar (17.5-17.8 PSI)is closer to my peak. Is a 20.3 PSI peak just under optimal conditions? in other words is a 2 lb drop normal? I'm obvisously ignorant wen it comes to boost, i know the ecu electronically compensates but could it be that far off and thats the closest it can get or can it be physical issue, leak for example? thanks in advance

 

A stock Mr will never hit 1.4 bars 1.1 and spike a little over you need an mbc to make it boost more.

Evo Rs 333 Hp 322tq.

 

http://www.evogarage.net/index.php/F..._have_stock.3F

 

My stock IX was spiking at 20psi,then tapering down toabout 16psi. After i tuned it with Accessport it will spike 21-22,then taper to about 18-19.

 

Is there a difference in the boost map for an MR versus an RS?

 

mitsu: you need MBC, it is normal that after 6000rpms it will drop to 16.5psi. Check for boost leak, Usually it leaks around BOV, try to tight both clamps.

 

That's what I saw on my stock IXs. As you suspect, the max boost quote applies to max load and optimum conditions. If you get tuned and install a MBC, all that will change.

 

Thanx i'll def check the clamps. My main concern was more about my peak boost, im picking up an HKS electronic boost controller from a friend but a MBC would make me feel more comfortable.

 

Sweet deal so i guess MBC is the way to go. Im waiting to get some upper & lower intercooler pipes along wit exhaust before the tune though. would a change from the stock airbox to a cone filter affect boost negatively without the tune?

 

The change can make your car run worse. IIRC, Buschur sells a cone filter kit that can be used safely without a tune. This said, why not get a tune?

 

The word "worse" can be used loosely as it depends on the car and set-up used. I put the Injen set-up on my car and noticed no negative affects, but still knew there was more power waiting to be unleashed after the tune. The sucking in of huge amounts of air followed by the loud whoosh of the DV make it appear that you are going warp speed, and after the tune you will be. Idle quality might change, boost response might change, drivability throughout the RPM range, etc. That being said, everything is dependent on the tune so make sure that is in the near future to optimize your performance.

 

Agreed. That's why I said "can" instead of "will."

Out of sheer curiosity, have you logged your car?

 

Ok so maybe someone here can point me in the right direction. I just bought a 05 MR and all looked stock but after poking around i found that the brackets that hold stock airbox were both gone. Like someone had a after market intake on it and when they got ride of it they threw the stocker back on but didnt have the brackets. Anyways I see 1.4 bars regularly if I stomp the pedal, but still tapers off around 6000-6500 exhibiting similar behavior as RAZOREXPRESS. So could this mean previous owner had veh tuned?

 

I have a IX RS and I spike at 25 psi and quickly move down to 18-19 psi. My mods are cams, tbe, ic pipes, and 3-port bc solenoid. The spiking problem started when I added the tbe, which was before the cams, ic pipes or the 3-port. I'm going to be doing ECU based boost control soon, but I'm wondering if I'm going to be covering up an underlying problem.

 

hey guys?!!?i think i have a problem with my boost if anyone can help me please?so anyways i have a evo 9 mr with downpipe,exhaust,intake and BOV.i was pushin about 1.3 kpa on the boost.then i added a invidia exhaust manifold and my car seems to have lost torque and the boost on first gear didn't kick in till about 4 to 4,500 rpm .then at a higher gear i would punch the gas and see the needle point at 1.4-.5 then drop down to 1.2-.1.does anyone know what might be the problem.