I have a 2008 350z, and I put on a takeda intake system and a megan drift spec exhaust. It is pretty jerky in low gears, and when I if I let off the gas, I'll get a popping noise from the exhaust which I thought was backfire. I recently read somewhere this is because Im running lean? Am I too paranoid? I have this obd port scanner and have no codes.


Ive driven about a 1000 miles since I put on the exhaust and intake and Im afraid that i hurt my new z... thanks

 

you are running lean but it will not do much harm unless you ride around like that for a long time.. finish doing all your bolt ons you want to do, then get an uprev tune.

 

Alright. How long is a long time? and im not sure what else to do for an hr thats worth besides a lighter pulley or like cams which im going to skip. Is the uprev tune a kind of thing where you can send in your ecu and they send it back to you?

 

Test pipes or HFCs are definitely one of the best bang for the buck mods.. I'd do those. google uprev tune and you can read about it lol.

 

the megan drift spec is already catless. And im going to take it to a local shop and have it tuned on the dyno. You dont think I did any permanent damage though right?

 

Wait wouldnt I get some kid of lean code if I was running lean?

 

Cats are before the y-pipe, and as far as I know, the Megan drift spec is not a header-back exhaust system.. I have test pipes, megan hr y-pipe, and Megan drift spec, couldn't drive my car at all with that setup un-tuned. Got a base tune from RT Tuning with the UpRev software, fixed everything. I reccomend getting a tune ASAP. You never know how lean you are running, every motor is different. But, with stock cats, I'm fairly certain you aren't in any danger of being too lean. The stock ECU does a good job of keeping things from getting too out of hand IIRC.

 

That is true ^ the HR ecu adapts to mods a lot better than the DE ecu does.

 

Alright I have a tune scheduled for next saturday. but if i got a y pipe, i wouldnt be able to drive it to the shop? its probably half an hour away from me

 

are you asking if a y pipe will fit inside your car to drive to the shop? if so, then yes it will..

 

if i can fit two golf bags in the trunk then i can probably fit a y pipe lol. What I meant was if I installed the y-pipe the night before, could I drive it to the shop the next day?

 

yes

 

I'd replace the stock cats while your at it... make the most of your tune that way. It's a pain in the *** on the HR, but it can be done with multiple extensions, (make sure they are 1/2 though, not that ***** 3/8 shizz) on jack stands, along witha 5 foot jack handle lol.. otherwise figuring on paying the shop a few hours worth of labor.

 

How much of a power gain would I get with the y pipe? I'm tempted to buy them but this is my daily, and Im not sure if I want it any louder than it already is with the singe pipe. But on the other hand, flames are cool

 

It'll be a small amount, it's more of a sound mod IMO. Maybe 1-2hp? Idk exactly. Stock cats are restrictive, so youll see a better gain getting rid of those.

Edit: Didnt read that carefully enough... haah

test pipes will yeild a more signigicant gain, depending on the tune possible 10+ idk exactly though. I'm thinking I'm in the high 290's with my setup.

 

297/262

 

I appreciate the help guys, but one thing still bugs me. If I was really running lean, wouldnt I get an ecu code saying that Im running lean?

 

no.

you're running lean and need to get tuned. no other way around it.

pay to play.

 

I have art pipes jwt pop charger and tdx2 and uprev tune. And I still have the popping sound... Is that normal?

 

what you describe sounds like run on... does it do it when you let off the gas?