hey guys

i have a IX with the following mods:

3" Cat-delete
3" Catback
and a Defi Blackface elect. boost gauge.

my boost is not stable...especialy in lower gears. it spikes to about 20.5 psi and then settles at 19 then spikes back up to 21 and goes back to ~18/19 towards the top of the rpm range.
i am just wondering if this is normal?

i am not tuned yet..i am just waiting for the rest of my mods to get it so that i could get a custom tune towards the end of the month
i am running 98 octane fuel and the car is running smoother than stock..

thanks in advance for the input


Respect
Moose

 

get a boost controller

 

i have that on order...just waiting to recieve it..

however...is "unstable boost" something normal?

 

Not sure but...you are going to love your car with mods once your tuned. The sooner the better.

 

Trust me...i CAN NOT wait!!

thanks anyways...

anymore takers?

 

^ dude that's normal, I thought when you were talking about spiking I was gonna read about you SPIKING to like 25 or 26 lbs. It's alright, your fine.

 

yes it's normal, what you're seeing is the stock boost control solenoid over-reacting when it's opening the wastegate, and then correcting. the fluctuations you describe are well within the "safe relm" and nothing to worry about.

 

Are you keeping your foot on the pedal? Or are you running over small bumps and will bounce your foot off the pedal? My first mod was a Defi Elec Boost Gauge, second was a test pipe and downpipe. Boost was fine and didn't do anything weird like how yours is doing.

 

that's not weird at all, read the posts above. His boost is fine

 

alright!!

thanks alot guys...

now i gotta start another thread asking what to get..a MBC or an EBC or do you guys wanna answer me here and save some server memory ?!!

and trust me i've done my homework and searched but still couldnt set my mind.

just for reference the parts that are on order are:
3" Downpipe
Injen intake w/ UICP
and a custom tune (Using Unichip Q+ piggyback ECU)

 

the IX's respond really well to ebc, but a good cheap and reliable alternative is an mbc

 

Well it's weird to me since I didn't get the same reactions he got and they posted when I was typing so I didn't get to read it before putting in my Info. I have a IX also and I didn't get boost reactions like that....I'm just replying to the original poster with my experience. Thank you come again!

 

trust me...my foot on the pedal was glued to the metal...i fealt that if i pushed a little more..i couldve caused a dent in the firewall..lol

 

a more stock car will see less boost fluctuation that a car with a freed up exhaust and intake. he has a downpipe, (presumably a turboback exhaust), intake and intercooler pipes. His turbo will spool quicker than the stock ecu is accustomed to reponding, thus leading to a less stable boost curve when contolled by the stock BCS.

 

Any specific EBC you guys recommend??

my tuner suggested he could control boost via stock ecu's solenoid...hmmm