After reading a few threads on here about needing(not) a tune after installing a CAI I wondered why that would be. I figured the MAF sensor should adjust for it so you should be fine. Now I'm not saying that sensor will adjust if you put a turbo back exhaust, boost pill and CAI rather just for a CAI. So the past Sunday I installed my Injen CAI (http://www.injen.com/Galleries/ProductPress/SP1837P.jpg ), EVO X I/C and EVO X I/C Piping. Lastnight was the first chance I had to test my A/F ratio using an older verion of this inovative ( http://www.innovatemotorsports.com/products/lm2.php ) wideband. The results are as follows:

Idle: No reading - I plugged the exhaust pipe the sensor wasn't in and saw 21.9 to 14.5. Unplugged the pipe and there was nothing

Approx 1/2 throttle 3rd gear (man. mode) from 2k to 6k: 12.5 to 11.8 - Blocking one of the pipes made no difference here.

Full throttle 3rd gear (man. mode) 2k to 6k: 11.6 to 11.0 - Tried to block one on the pipes but my rag wouldn't stay. Reguardless if both pipes were open this should be a good reading.

This test was done by myself so the A/F numbers are an approx reading. I was trying to watch the road, look for cops, watch the meter and watch my boost gauge. Now I can agree on a tune to lean out the full throttle fatness but I'm not sure I will. Running a little fat is safer, to me anyways.

2009 WW Ralliart
Injen CAI
Evo X I/C
Evo X I/C piping
No tune
~52deg
~2700ft elevation in Meridian, ID

 

Good to know. Thanks for posting your results!

 

I would say that NO tune is required, just like the product suggests.

 

and i would say a tune IS required for ultimate safety and reliability.

 

wow .. this seems like an ongoing debate for the rest of RA's lifetime..
I guess I wont put in my AEM intake + Evo MAF tube yet then...

 

as you read in the other thread about hte evo maf tube and cone filter you will be fine with no tune, this has been proven already.

 

yeah i read about that already .. what i mean is I should do more research before putting it. I just feel safer when I know more facts about what I'm putting in my car..

 

Would you eleborate on this??

 

CAI = increase in air flow + density (due to cooler air)
Ralliart fueling = rich from factory (install a straight through test pipe, and you will smell it)
CAI + Ralliart overfueling = perfectly fine

 

while rotor glow seems to think he knows what an intakes hes never seen will do, i have seen 2 installed near me, both showed lousy air fuel.

At wot both were in the mid to high 12's 12.7-12.9 which isnt in the 13's but also isnt safe. Its always safest to let someone make the parts work for you.

 

In case a 5yr old wrote your response, let me understand you're saying. You tested a RA with just an cold air intake of some brand and at WOT your a/f numbers were high 12's? If thats the case then yeah a tune would be a good idea. However based on the information i've provided you're telling me my figures are unsafe?

 

You see he never mentions the fact that those intakes were NOT Injen products. Do not trust those other products out there, they WILL cause your ratios to be that high. All you have to do is read http://www.injen.com/Galleries/ProductPress/SP1837P.jpg and find out yourself that...

"MR Technology (tunes intakes to factory air/fuel ratios) patented"

That says it all. Injen is the ONLY safe one out there, and they hold the patent so that NO ONE else can copy them.

INJEN IS SAFE TO USE, bottom line.

 

lol

no if you could read, then you would have seen where i said there have been 2 ralliarts in my area, whom have purchased the Injen intake system and had their car dynoed and tuned. Prior to the tune, the A/F was logged on the dyno by the tuner, both showing high 12's for afr.

 

fail wrong, but i bet you like house hippos, seeing how you believe everything you see.

 

Wait wait wait, your argument is that because Injen says their intake is safe and the best, it's safe and the best? Am I hearing that right? Personally I don't like the idea of an intake that intentionally allows unmetered air by in order to lean out the tune thus making power.