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Originally Posted by Account Attempt No. 4
Hey all, so I have the Perrin 2.5" CAI on my car right now. I bought it for the sound really, knew there wasn't much power increase on it. I'm thinking about switching to a 3" big MAF intake (or a comparable) but Perrins website says that with it the car must be tuned, in fact they say its "REQUIRED".
I have a bit of an understanding about running rich/lean, but I don't understand why it would be a REQUIREMENT. I get that it would need tuned to yield the maximum power out of it, but would the engine have some failure or increased wear if its not tuned specifically to the 3"?
Also, I have an OFT which has the pre-loaded stage 1 & 2 tuned to the stock intake, or comparable, like the Perrin 2.5" CAI.. So would this be good enough for the 3" big MAF as well? Would it still need a specific tune for the larger diameter CAI?
....or would it just be a waste of money upgrading the CAI if I have to get a custom tune (not a discussion about the various prices of them lol) for the 5-10hp increase that the 3" claims to give???  |
The OFT stages are not tuned for "comparable" intakes. They are tuned around the stock intake with a cut and widened front air scoop and with or without a drop in filter. Not sure where you got the idea that running an intake would be fine without tuning since the OFT release notes specifically say stock intake.
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OTS Map Requirements:
Stage 1- For vehicles equipped with original header. Other exhaust modifications also compatible. Stock airbox (with or without aftermarket drop-in panel filter) also recommend. Premium grade fuel only.
Stage 2- For vehicles equipped with aftermarket cat-less headers. Other exhaust modifications also compatible. Stock airbox (with or without aftermarket drop-in panel filter) also recommend. Premium grade fuel only.
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The reason why its not a good idea to run an intake without tuning is because anytime you increase the diameter of the intake track or move the MAF sensor from its stock location, you change what the MAF is reading. This is especially true when you increase the diameter of the intake because the MAF scaling is drastically different than stock.
Will you be "fine" running the perrin 2.5" cold air intake without a tune? Probably. But you are also ideally making exactly the same HP as stock ideally and probably making less without tuning for the intake.
Running the 3" Big MAF perrin intake without tuning would be a recipe for disaster since the engine will not know exactly how much air is coming into the engine and that affects the fueling.
As for HP gains from intakes. I'm highly skeptical of any HP claims on intakes from dyno charts that are provided by the manufacture. Its been proven time and time again that the vast majority of intakes made for this car don't make any power and most actually lose power or are unsafe. Any gains shown on a chart are most likely there by leaning out (unsafely mind you) the engine, which gets corrected after several miles of driving by adjusting LTFT's. Once you get your car tuned to operate safely with the intake, the majority (if not all) of the gains come from the tune and not the intake. My advice would be to sell the intake you have and go back to stock.