My 04 cobra is currently chipped but has the stock intake. Will installing a CAI that says no tune is required mess up my current tune. Will it make it lean out with out updating the tune? Trying to keep current tune. Thanks guys
Christian,
Just to clarify:
Are you planning on installing a cold-air intake (CAI) or a ram-air intake (RAI)?
Quite often, the CAI will add a few bends and change the length of the charge tube. This will affect how the air flows over the hot-wire used in your MAF-based control strategy. Your fueling and load (used as one of the inputs in the ignition timing calculations) are calculated based on your MAF counts. Any MAF count errors will be carried over into both your cylinder fueling and final spark advance values. Factory footprint RAI systems are less likely to raise concern.
As procharger and me32 commented, using a popular setup that does not significantly change the air path shouldn't cause much trouble.
As long as your current "tune" is not some sort of max-effort value file, you should be alright.
Also, it is good practice to always clock your MAF in the same orientation when disassembling and reassembling the intake (paint markers do the trick).
I meant RAI and thank you guys for all the great info.Christian,
Just to clarify:
Are you planning on installing a cold-air intake (CAI) or a ram-air intake (RAI)?
Quite often, the CAI will add a few bends and change the length of the charge tube. This will affect how the air flows over the hot-wire used in your MAF-based control strategy. Your fueling and load (used as one of the inputs in the ignition timing calculations) are calculated based on your MAF counts. Any MAF count errors will be carried over into both your cylinder fueling and final spark advance values. Factory footprint RAI systems are less likely to raise concern.
As procharger and me32 commented, using a popular setup that does not significantly change the air path shouldn't cause much trouble.
As long as your current "tune" is not some sort of max-effort value file, you should be alright.
Also, it is good practice to always clock your MAF in the same orientation when disassembling and reassembling the intake (paint markers do the trick).
The MAF sensor is very important. When changing CAI be sure you don't change tube diameter right by the MAF if you're on a slot sensor. If you introduce bends or curves in the intake in front of the MAF it'll likely cause you some minor drivability issues. Sometimes just clocking the MAF around in different orientations will get you by, sometimes a minor revision of the tune is required.
As always, check your A/F with a wideband when changing up parts like this.
Don't assume anything. As I said above, check your A/F with a wide band. That's the only way you're going to know if you're running richer (or leaner), requiring a re-tune.Would I require a tune with CAI, intake and pro chamber (no cats) with borla catback? Just reading around on the forum here that my car could run rich and may be in need of a tune.
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