I think you meant to say
"Hotter" there, but yes, I agree. It's about the ability to use denser air that will combust in the proper A/F range. Leaner = hotter. When a MAF IAT sensor detects overly hot air, the timing maps are rolled back along with performance. Cooler is always better..:tup:

just to clarify, cooler air (denser) will make the A/F go leaner, and hotter air will make the car run richer.

Yeah, sorry..That is correct, but the 02 sensors downstream are always correcting for that. It's the timing that imposes the performance hit..

Yes, the ECU gets a hot Intake temperature it cuts fuel to keep the A/F ration in place, which robs performance.

With cooler Intake temperatures it doesn't do that.

Ever notice your car running good on a cold day...its the ECU giving more fuel to burn with the denser air.

Well....Close but......

Fuel is always being adjusted no matter what the temperature. This is handled downstream by the 02 sensors which are constantly making minor corrections to A/F based on Measured data from both sampling, and the MAF flow information. They don't care what the Intake temps are, they are just concerned with keeping things in line. There are Short term trims (imediate minor changes happening all the time), and long term trims, (that build up a reference map based on the overall conditions). Heat and IAT temps largely affect timing maps in most modern ECU's...They dial back timing as a protective measure.. The performance loss you experience is largely this adjustment. Fuel continues to be held at or around stochiometric (14.7:1 A/F) as long as you're in Closed loop mode (not WOT Open loop which uses pre-built Fuel maps and ignores 02 input). Here's an IAT and timing adjustment chart from an '08 Corvette. Notice how, at temps, over a mere 86 degrees, a timing retard starts being implemented...As a reference, it is not unusual to see the IAT's on the Z exceed 150 degrees when sitting in traffic. On the Vette chart, that's an average -6 to -8 degree timing pullback

http://images38.fotki.com/v1212/phot...586/iat-vi.jpg

Looks good Steve. Perhaps I can check out your latest creation this weekend.

Yup! Lets get together!

Nice work...maybe you can become a manufacturer of high-performance parts a la Stillen, HKS, etc.

Modshack,

I installed your cai ventilation system last night and all went smoothly. I do have a one question. Does a 2.5" tube allow enough air to enter the filter area - I noticed after my installation that you trimmed the aluminum flanges. Was that to allow more air in off the sides or just to make it fit? Also, were you able to route the tubes so they can't be seen from the front - haven't been able to do that yet. Thanks.

Where did you get the hose and the circular parts?

Follow thr link in my Sig to the photo album. It's all there..

Cool!

The front flanges were trimmed to fit better (bring the bottom of the flange up flush with the Fang opening) , the back flanges were ones I had leftover from another project and were already cut. You should be able to get plenty of air through there regardless..

On the tubes, I got the drivers side out of sight. The Passenger side still shows a little, but I went in from the top with a long Zip tie and snugged it toward the top a bit. You really need to look for it now to see it..

It doesn't say where you got the hose from just the alum piece.

Ummm...Everything was listed at the top of the album page:

(4) 2.5" aluminum flanges P/N 10350-10
(6) foot Aeroduct hose P/N 05-29810
(4) Stainless clamps

From: Http://www.aircraftspruce.com

Thanks for the info. I'll be doing this this week.

Any pictures from further away, just to see if it looks completely silly or not :P