People with 2.5" or greater catbacks.

[QuA]

When you have your catback installed will this increase the amount of boost you have? Im a little worried that my intial peak is gonna be too high after my catback install. I got my 2.5" brullen DP still.

QuA

[Flanders]

Re: People with 2.5" or greater catbacks.

when I put my 2.5" with stock chip and stock downpipe, I got about 1 psi increase everywhere.

I've since added a 2.5" dp, and then removed my 2.5" cat-back...I've lost 1 or 2 peak psi...

[R_Ethug]

Re: People with 2.5" or greater catbacks.

okay this would explain why spike to 14 in 5th then hey..

[Kor]

Re: People with 2.5" or greater catbacks.

It has to do with backpressure. Less backpressure is going to mean your wastegate opens with less resistance. Some 2.5" systems reduce backpressure more than others, but the overall goal of any exhaust is low backpressure so you will see some effect.

Less resistance on your wastegate does not really mean increased boost (although you may see higher boost levels at some times). What it really means is that you have less control over the boost, since the factory system assumes that the wastegate spring is adequate and matched to the ECU and N75 capabilities. The end result may be surging, increased spiking or slower spool up due to wastegate creep.

[QuA]

Re: People with 2.5" or greater catbacks.

Yikes,

Im kinda worried about my boost levels when I get that catback put on. Thanks for the info!

QuA

It has to do with backpressure. Less backpressure is going to mean your wastegate opens with less resistance. Some 2.5" systems reduce backpressure more than others, but the overall goal of any exhaust is low backpressure so you will see some effect.

Less resistance on your wastegate does not really mean increased boost (although you may see higher boost levels at some times). What it really means is that you have less control over the boost, since the factory system assumes that the wastegate spring is adequate and matched to the ECU and N75 capabilities. The end result may be surging, increased spiking or slower spool up due to wastegate creep.

[QuA]

Re: People with 2.5" or greater catbacks.

I'm itching for my 2.5" catback. Im most likely going custom... 2 weeks and its on!!!!!!

[R_Ethug]

Re: People with 2.5" or greater catbacks.

hey qua if you wait until summer i'll sell you my brullen.. well if C1 gets apr cuz i'm going to get a APR TB i think

[QuA]

Re: People with 2.5" or greater catbacks.

hmmm...... lets talk business.

hey qua if you wait until summer i'll sell you my brullen.. well if C1 gets apr cuz i'm going to get a APR TB i think