Fast Intentions exhaust is here!

Speedy · 04-05-2012, 02:57 PM

Quote:

Originally Posted by PaulZ370

I just contacted Nissan regarding this, having just upgraded my HFC/CBE and have a K&N Typhoon Intake. I told the Service Manager whom I trust that I just upgraded my exhaust, but its nothing more than what a NISMO would ordinarily be. He stated emphatically that there is no need for a Tune. Again the pharse is " NO NEED " for a tune. You won't burn a valve or damage your engine simply because of a simple Intake and exhaust upgrade. Unless you go Turbo, Supercharger, Nitrous or anything beyond of what a VQ37VHR is asked to do by the factory, the car should be fine. If you track the car and push it to it's limits, then it's a whole different ball game, and you may want to tune because you are looking at optimal power, not just a fun ride.... You can still tune it if you want regardless, but herein lies the risk. You tune it, something happens, Nissan can claim you tampered with the programming on the computer and hence your warranty is void.

Now it's up to each individual to make up his/her mind what they want to do. Upgrade hell? Here it is... Decision making time...

I'd say your service manager is correct. These cars are MAF based, which reads air flow and adds fueling to what it sees from those readings. I doubt mild bolt ons like a CBE and CAI will flow enough air over stock to get the MAF out of the range of adjustment it can command from the PCM.

Has anyone actually ran AFR numbers on a car before and after to see how much the AFR changed with a CBE, CAI, or combination of the two? Surely someone has. On my Challenger, exhaust and intake didn't change the AFR at all, and it's MAP based and has no way to adjust for anything on it's own like a MAF car will.

I'd wager maybe even test pipes wouldn't need a tune either. Maybe adding LT headers would finally get to a point it'd be necessary....I'd need to see some data from the other bolt ons to speak to that.

My 4Runner is MAF based, and it adjusted just fine with no tune when I slapped a supercharger on it AFR wise at 7psi of boost. However, I did have to add a piggy back controller to manipulate timing, then I upped the boost to 10psi and then had to tune it, which I did myself.

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