i know this is prob the 1 millionth thread on this topic but i searched and it doesn't seem that anyone has a boost pattern like mine. primary 8 psi, transition 10 psi and secondary back to 8 psi? will a boost controler fix my problem or is this something more serious? i have gotten 2 boost spikes in the past 2 weeks also.. somewhere around 13-14 psi, luckily i was watching and let off the gas.... i am driving my car carfully, seems to run fine other than the boost pattern. my mods are greddy intake, dp, apexi n1 full exhaust, w/ stock ecu. if anyone can help me or point me in the right direction thanks in advace. thanks guys
-kevin

 

Sounds like you gave a vaccuum hose issue... especially if it's running well. I'm not that familiar with the diagram, but since normal is 10-8-10 then it sounds like 8-10-8 means your prespool and your wastegate are talking backwards to eachother.... but like I said I know that a "Hose Job" will most likely fix that, but I'm not sure what's supposed to be hooked up to what... I'm most likely going to do one soon, but If I do, it'll just be remove this one, replace, remove replace etc..... since my hoses are plumbed correctly...

-DC

 

I do have a whole silicone vacume hose and tie done about a year ago and haven't touched them since so i don't belive that the hoses were put on wrong but maybe one poped off? could that explain any of this? i will try and check my hoses tonight. thanks dcrosby, anyone else have suggestions? opinions? thanks
-kevin

 

IMO, looks like your primary and secondary are low with a spike during transition (most likely due to the cold weather).

What mods are on the car currently?

 

(greddy intake, dp, apexi full exhaust, stock ecu, silcone hose and tie..... those are all the mods that would matter in this situation.. i have others like brakes ect but no point listing them all

 

Are you using any boost control (manual or electronic)?

 

no... i would like to get a manual boost control soon, the dual (black&red) ones... but no i do not have a boost control as of now

 

Ok, seems like there is some restiction somewhere on the exhaust side (since you are spiking it wouldn't necessarily be on the intake side).

You stated "full exhaust" earlier. Are you running a midpipe or just the stock main cat with a downpipe and Apexi catback?

If you still have the main cat, it might be failing causing some restriction.

 

ya i def still have the main cat.. i heard running a mid pipe w/ stock ecu is a big no no..... so ya, could it be a clogged main cat?

 

Possibly, have someone check the backpressure, or rig up a boost gauge to a hollowed out O2 Sensor... if the amount of pressure exceeds 6 PSI, you've got serious backpressure issues...

 

anyone else have opinions what it might be? or does a clogged cat sound right?

 

Mahjik's right on. It seems you either have a clogged cat or a small boost leak. I would be careful. Once you find the cause of your low boost, you are going to need a boost controller. As always, I strongly recommend a Profec B (old one, not the new Spec II).

 

ok, thanks for all ur help guys

 

i'm running a 6-8-6 boost pattern...or around there. I know the wastegate, unregulated by any solenoids, will only hold 5-6 psi, so i'm thinking that I have a lazy solenoid somewhere....anybody....anybody?