I have 04 coupe AT with cold air intake, plenum spacer, MREV lower collector, borla headers and exhaust.

Im wondering if this may make it run too lean. Im looking for more horses without replacing internals. Would i get this with new fuel injectors or new fuel rails?

I don't know much about these things and I don't want to mess my motor up.
If anyone has ANY insight on the subject please help!

 

If you are worried, reset the ECU and call it a day. I have all that except the headers and I have been running it for four years like that. Don't get me wrong, a tune would def get you more HP out of what you have. Is it worth it? Only you can decide.

 

Get a ECU tune for the VQ and you'll be using more of the potential that is possible from those parts. If you don't go that route, no need to worry too much about that because your ECU should get accustomed to the change in air available and adjust the duty cycle of the injectors. Note that its not a huge difference, and you might even be loosing power depending on the size of your exhaust system and collector.

Spacer/collector upgrades are better for FI setups.

 

Well every little bit of info is more than i had so thanks.

Do you think getting bigger injectors would help get more out of it or should that be left for the FI club?

 

you're fine with stock injectors.

 

Get a dyno with a/f reading... if you are running lean you can add fuel with a tune (ecu flash)... you don't need any hardware as it relates to fuel.

 

Keep stock injectors buddy, yeah... thats for the FI side of the spectrum. Or guys with built N/A motors running high compression.

 

Word. thanks

Any other mod suggestions without going FI or to internals or have i pretty much reached the limit?

 

After an ECU flash, your next mods could go towards weight reduction and suspension.

 

yeah thats what i thought. my buddy is trying to get me to buy a turbo kit with boost 10lbs or lower so i wont have to pull the motor appart.

 

whartline1110 you should really think about re-enforcing your motor if you want it to last. Its true that the VQ has a strong bottom end and can handle those pressures... but the VQ was naturally made to rev. It has a lighter components that were designed towards a N/A motor (obviously). So I would suggest doing some internal work before the turbo or else your gonna run into the typical inevitable problems that most if not all people who boost get.

Just a heads up man. Its not as easy as some boost crazy fool might have told you.

 

yeah i know ive since done a lot of reading on the forum and it sounds like the overall consensus is "dont do it". i think im going to take the route of your first suggestion and go to work on the suspension.

Thanks for all the advice its been helpful

 

Geeez people sure like to give out advise even if they have no idea what they're talking about.
If you have an intake, MREV, spacer, headers and full exhaust I can almost guarantee that your car is running lean. Nissan says that the plugs are good till 100K miles, but I've seem many cars that needed new plugs at 20-30K miles due to this.
Contrary to what some people think, the ECU will NOT "relearn" to your mods, the way our ecu's work is they adjust to get as close as possible to pre-set values, which unless you get the ecu tuned are going to be the ones set at the factory for a stock car.

Look into an Osiris ecu tune by uprev, it will optimize the air/fuel ratio and timing and make sure that your car is running as well as possible.

FI is a completely different game, do the bolt-on's first and see how that treats you before you spend $15,000 and possibly blow up your motor.

The stock 290cc injectors and fuel rails are more than adequate for bolt on power, don't even mess with it.

 

^^^you just said what most of us in the thread said days ago... who are you referring to?

 

Good point on the lean a/f ratio.
btw, I know it won't reprogram itself completely, what I meant is that it would try a little bit. Which is why I mentioned a ECU tune.