typhoon or airaid intake

[ptgtcb]

I think all that would be needed is a straight tube from the stock air box to the turbo. Personally I do not believe that the engine would need any more air than what the stock air box can flow.
I also don't think any of the available aftermarket intakes even look that good. To me they just do not look like they belong in the engine compartment. It just does not look right with the filter element flopping around in the engine compartment, sticks out like a turd in a punch bowl. Just my 2 cents.

[Mean Green]

quote:Originally posted by ptgtcb

sticks out like a turd in a punch bowl.

Now that's funny.

[macster]

quote:Originally posted by ptgtcb

I think all that would be needed is a straight tube from the stock air box to the turbo. Personally I do not believe that the engine would need any more air than what the stock air box can flow.

Actually, you are not getting the maximum from the stock airbox, because it has the restrictors in it. Thats why IAN-PT and others have noticed improvements when they take the restrictors out. Today, I'm going to the dyno and will do the first pull with the stock airbox and the second pull with the K&N Typhoon, and a third pull with an open ended cone on the K&N. The results should be interesting.

macster

[Jason_L]

It would seem to me that the CFM in an "opened up" system would be limited by the turbo inlet and the filter.. if your inlet is 2.5" (just a number out of the air, I have no clue what the correct one is), then it wouldn't seem to matter if you had a 2.5" or a 6" pipe between it and the filter. But, throw those curves in the pipe and it might change things some. Does a straight pipe have a higher cfm then one with a few decent mendrel bends in it? if so, then a 3" with the bends would seem to let you bring the pipe's cfm back in line with the 2.5 inlet.
But then again, maybe the filter is the true limiter here? depending on the flow of the filter, everything else could be moot.

LoL - I have no answers When the UPS man delivers my OBD scanner/logger/dyno maybe I will be able to test all this.

[ptgtcb]

I appologise for getting off topic, but......
All the so called restrictors are straight through and just muffle the sounds, yes they are narrower but with any CAI you are not going to see much benefit unless the engine is tuned to the CAI which means reprogramming the PCM to account and benefit from the additional flow! Who is going to do that?
However, I am looking forward to macsters data which will be great info and set us/me straight!

[Cal Cruzer]

The engine has wide parameters programmed into the computer to compensate for additonal air flow. Remember that the computer is reading all of it's sensors to try to achieve a perfect AF ratio, mainly for smog purposes, but an incidental side benefit is that and efficient engine is also producing good power. Sticking anything int he path of the airflow will restrict it, even though it is just a silecer. take a straw and suck though it. Then stick a pipe cleaner in it and suck again. You will feel the difference. Then replace the straw with a larger straw. You will get more air. Pretty basic there. It would be an interesting exercise to acutally measure CFM demanded by the turbo at different RMP's and see how much the various solutions acutally deliver. Then you get into porting intake manifolds and heads but as a general rule the things manufaturers do to just the air delivery systems to keep them quite will restrict flow and rob horsepower. Those silencers are obstructions in the smooth delivery of air.