I did some research a while back on how our stock MAFS gets its readings, and why most aftermarket Intakes
cause lagging and sometimes CELs. What I came up with is that the MAFS needs to be placed in a specific housing to get accurate readings, which requires two things:
1. 2.5" Piping: Most aftermarket Intakes
use 2.75" piping, which actually slows down aiflow past the MAFS, since the engine can only suck up so much air at one time. This makes the engine think it's getting less air, since less is going by the MAFS at any given time. This results in the ECU reducing the amount of fuel used, making the engine run leaner than stock. This may not cause a CEL or bogging by itself, but the MAFS needs one other part to operate correctly (which NO aftermarket Intakes
have had until now):
2. 6 MAFS "Fins": The bars that sit right in from of the MAFS in the stock airbox. These direct air through the hole in the bottom of the MAFS. This in turn helps pull air through the top of the MAFS. The air enters the front of the MAFS, goes up through the top with the two little spring wires, then comes out the back, and gets accelerated by the air going through the bottom. Thee intersecting fins on either side of the MAFS help concentrate the airflow around the bottom hole, increasing the airflow through the MAFS even more. These fins are just as important to achieving the correct air speed through the MAFS as the right size piping is, which is why the 2.5" RMM Short Ram
with no fins still causes bogging, even though it has the right piping size.
TPR MAFS fins layed over the stock airbox tube with its own fins:The TPR CAI and SRI has both of the above qualities, so when installed correctly and used with a clean, properly working MAFS, you will NEVER get a lean CEL!
Basically, the TPR Intakes
are comparable to running with a stock airbox with the restriction almost eliminated. The fuel curves are much better than with any Intake
, so you will never run lean and bog or get a lean CEL (P0171). In the end, if you didn't get a CEL or bogging/hesitation problems running with the stock airbox, you won't get any running with these Intakes
I originally came up with the idea of modding the stock airbox to achieve the same thing (codename: Perfect CAI
), and it has worked flawlessly for everyone who has tried it, on CAIs and SRIs. I'd link to the posts with the info and reviews, but the site they're on has been mysteriously blocked here for some reason
(if anyone wants the links for proof, email me at email@example.com
). This same idea was used in the TPR Intakes
for those of us who wanted a show quality appearance instead of a DIY job. The TPR CAI
does have a different power curve than the ebay/AEM CAI
and stock airbox combo, but it still competitive and/or superior to any other CAI
out there (including AEM
Gen 1 and 2, Injen
, K&N , etc).
Of course, if you have a Power FC or any other aftermarket ECU or piggyback ECU, you can tune the MAFS to read any Intake
properly, since the MAFS and ECU won't be limited to the stock detection range. But for cars with the stock ECU, the TPR Intakes
are the best and safest Intakes
on the market.
I've attached pics of the Perfect CAI
stock airbox mod I mentioned above (email me for info on how to do it, since I can't link to that "other" site
). All this mod is is cutting out the tube part of the stock airbox, smoothing the surface, and attaching it to any aftermarket Intake
. It may not look that great, but that's what the TPR Intakes
are for. These pictures are NOT of the TPR Intakes