Ok so my car has a K&N intake and UICP....getting an exhaust put on this coming thursday...how soon should I get the car tuned???
Also don't have alot of money to blow seeing as I'm getting married in a year
AND I have over boosted once before but with jus intake and uicp actually made me really mad hahaha!!!
Any suggestions on how soon I should get this tuned?? And is my gas Milage guna suck after this exhaust??? Because I have to drove to LA this weekend and thats about a 350 mile drive from me n don't want to spend $200 on gas!!!!
Thanx!!!

 

If your tune is good, then your gas mileage won't be affected much by the exhaust. Maybe a few MPG (1-2).

 

If you overboosted with just an intake and uicp, i would recommend getting it tuned, especially if you are getting a tp or hfc.

 

If you can't afford to do it right, don't do it at all.

 

My guess is that a fresh tune is cheaper then a wasted turbo from over boost or a motor from the same--. Just a thought.

 

can someone [in a nutshell] explain overboosting?

is it an effect cause by some not-stock modifications that causes more boost to be built up than normal/safe?

 

overboosting is anytime you run more boost than your tune(r) intends..

overboosting will ALWAYS occur, its really how much your overboosting is considered a problem.

ie if your tuned for 25psi, and you sometimes hit 26psi then thats ok..

however if your tuned for 25psi, and you hit 28psi then thats bad...

overboosting USUALLY occurs (for me/my tunes) when you shift - this is because at the shift rpm (4000+) the turbo spools so quickly the wastegate often doesn't react quick enough.

one way to mitigate it is to run lower WGDC and let the boost error correction take over.

in regards to the OP's original question - yes you should really get a tune after doing your exhaust... a less restrictive exhaust will have two affects:
1) leaner because of the increased airflow through the system
2) more boost because the same WGDC produces more boost on a less restrictive exhaust...

 

My experience was the opposite. The less restrictive exhaust on the stock tune put me in a higher range of load cells making the car run super rich ~10.0:1 at WOT. Yuck. Made the car not fun to drive. If you're going to stick with the stock tune stick the stock exhaust (and cat) or get just a catback if you really want. In my experience, driving with a TBE on the stock tune was LESS fun than when I had the stock exhaust.

 

yeh... that could happen as well.

either way it needs to be tuned

 

If you cant afford a tune then why would you pay to have someone else install the exhaust for you?