I was playing around with my Stock Filter Box and a friend wanted a stock style CAI no tune needed but could not afford the K&N Aircharger. so I made one for him in ten min. Noticable power increase and mileage.

Only Item he needed to purchase was a Spectre universal filter for 29.95 at Pep boys.

 

Pretty cool for someone on a budget or someone that likes the factory inlet tube.

 

not bad at all! looks pretty sharp. can't beat the price, that is for sure.

what heat shield is that? that isnt the jlt one is it? did you just cut up the stock air box bottom? in any case, good job!

 

Looks nice.
What is the A/F ratio now?

 

This weekend he is going to his brothers shop in Tazwell, Va he has a portable dyno on loan and he will check it, I would susspect that since the MAF meter and Sensor are stock there should be little change there.

It's a JLT Shield, I have the JLT II and I was testing the intake before he came over for install. a friend gave him an older version of the JLT heat shield. We were very suprised with the overall power and throttle response gains from this.

 

I'm curious to know if changing the intake tube on that setup would be worth any additional gains.

 

i think it would, but then i think you might have to get a tune.

 

you would not need a tune, because the MAF Meter and sensor will only monitor the amount of air that would enter the MAF in a second. so even if you doubled the size of the tube the MAF meter will only allow a certain amount to enter at any given time, I would think you could be creating some lag and reduced throttle responce by increasing the intake tube with out replacing the MAF Meter.

 

Sheer genius if you ask me - nice work

 

so can you run this setup without a tune, gain horsepower, and not throw codes?

if so, i may do this....

keep us updated

 

+1 on the keep us updated!!

 

Ok here is the update.
My friend had the car dynoed at his brothers shop today in southern Virginia and he used the stock air box first and got
263hp 281tq A/F 11.4 then he intalled my home made unit. 269hp 288tq A/F 12.1

Not big gains but not bad for 30 bucks, His car is an 06 GT Auto

He says the car feels stronger, while running down interstate 81, the trottle response was quicker, He Loves it,

As far as trowing codes, no way you are using the Stock MAF Meter, the computer adjust for the increased air flow, but other than that, it is 100% safe

 

Thanks Dave,
Wait till you see my next project..
A Functional Roush / Ford Hood Scoop.

 

If you change the diameter of the intake pipe, you will need a tune. The MAF is calibrated to read airspeed, and if you change the diameter of the pipe, the airspeed will change. The MAF does not read volume, it reads airspeed...and then calculates volume based on the known diameter of the stock pipe.

 

+1
In addition, the MAF has a max signal that it sends to the ECU. If that signal is exceeded(Read => install an overly large diameter MAF tube), then the ECU will not increase the fuel feed any further, the A/F ratio will get too lean, a CEL will light up, and the engine can sustain damage.

 

I must respectfully disagree Steve. The Airaid CAI uses a 98mm. intake pipe, which is much larger than the stock 80mm intake tube. However, with it's venturi insert placed in the MAF housing ? it reduces the MAF to the stock 80mm size, in which a tune is not required. As long as the diameter before the MAF, doesn't change ? the airspeed passing through the MAF sensor, remains the same. In addition, C&L now also includes a non-tune insert, in their street intake as well.

 

Well, basically you are saying the same thing. As long as the diameter of the pipe at the MAF doesn't change, no tune needed.

 

its gonna be hard for people to agree on if this is safe or not....

we have dyno proven hp gain, now about the test of time...

if in 2 weeks or a month there are no codes... i may do this.
looks good to me and has proven to be functional so far.

 

No not true, the engine is sucking in air, and it can only take as much as it can get through the MAF opening,
try drilling a hole in the cap and the bottom on a coke bottle the size of a straw and blow into one end of the bottle, you will only get a specific amount of air out of the other end. the same amount of air that you would get through a straw. just because the bottles volume has increased, the same amount of air entering will exit.

This Is what I was saying...

Anyway, The MAF and Intake tube are stock so why would the volume of air change, All I am doing here is adding a highflow filter to the otherwise stock intake, this setup will not create a lean condition or triger a CEL. Just allowing the intake to breath eaiser

Coming up this wednesday Track Testing. Any ideas on how I can measure acurate engine temps and intake temps before each run. we are doing one with Stock Box, then Modified Stock Intake. So, Since heat soak can effect times I need Ideas for a fair test.

 

Yes, that's exactly what I said..However, you didn't mention anything in your statement concerning the MAF diameter ? you clearly stated.. if you change the diameter of the intake pipe ? you will then need a tune, which is incorrect. Therefore I assumed, you were referring to the entire pipe diameter, even after the MAF ? and not before or just at the MAF itself ! With that being said, you really didn't provide very much info. to go by.. as changing the diameter of the intake pipe ? can be interpreted as meaning just about anything