CAI issues (again...sorry..)

Tee x2 · 10-14-2003, 11:30 PM

Sorry to bring it up again, cos I don't understand all the fuss about CAI vs. Warm AI(WAI) vs. Hot AI(HAI) even..
I thought whatever the temperature of the air that goes into your air intake will get heated up by the compression of the turbo (to some high turbo temp?) and cooled by the intercooler so how does sucking in warm air vs cold air differ for a cone intake?? TIA

gesTTalt · 10-15-2003, 01:20 AM

cooling needs to take place post turbo, hence the fmic/smic. This is some data points of ambient temps vs. manifold/intake temps. I requested more data from others, but no one really responded. Oh well. Btw, I got 245 g/s max on my custom open intake. The only reason I switched to the BMC is because someone gave it to me for free.

The design of the air element is more important to allow MORE air in, vs. if it were enclosed or not.

Here's a little write up of my thoughts

Tee x2 · 10-15-2003, 01:38 AM

and the reason why I have a HAI instead of CAI is cos it rains here often and I don't want the car to suck in water...

ITALSKIER · 10-15-2003, 04:21 AM

Tee x2 · 10-15-2003, 04:35 AM

TTQR03 · 10-15-2003, 10:27 AM

..The cooler the incoming air, the denser the "fuel charge" into the engine will be- A few degrees difference can make as much as a 7% difference in the power output- At this altitude (Denver) with a relatively "small" 1.8 litre engine, cold air makes a HELLUVA difference...

Lightweight-USPowah · 10-16-2003, 08:00 AM

10-14-2003, 11:30 PM	#1
Tee x2 New Member Account #: 60978 Join Date: Aug 2003 Posts: 361	CAI issues (again...sorry..) Sorry to bring it up again, cos I don't understand all the fuss about CAI vs. Warm AI(WAI) vs. Hot AI(HAI) even.. I thought whatever the temperature of the air that goes into your air intake will get heated up by the compression of the turbo (to some high turbo temp?) and cooled by the intercooler so how does sucking in warm air vs cold air differ for a cone intake?? TIA

10-15-2003, 01:20 AM	#2
gesTTalt Senior Member Account #: 24538 Join Date: Aug 2001 Posts: 5,284	My position is as you hypothesized...it's the volume of air that matters pre-turbo.. cooling needs to take place post turbo, hence the fmic/smic. This is some data points of ambient temps vs. manifold/intake temps. I requested more data from others, but no one really responded. Oh well. Btw, I got 245 g/s max on my custom open intake. The only reason I switched to the BMC is because someone gave it to me for free. The design of the air element is more important to allow MORE air in, vs. if it were enclosed or not. Here's a little write up of my thoughts __________________ Current: 2007 Daytona Gray RS4 Past cars: 2001 DB 225 TTC 2005 SC'd Honda S2000 2007 BMW 328i 2004 Nissan Frontier 2001 Lexus IS300 1993 Honda Prelude 1989 Isuzu Amigo

10-15-2003, 01:38 AM	#3
Tee x2 New Member Account #: 60978 Join Date: Aug 2003 Posts: 361	Thanks! Was just wondering that when I was putting in an aluminium panel for the intake... and the reason why I have a HAI instead of CAI is cos it rains here often and I don't want the car to suck in water...

10-15-2003, 04:21 AM	#4
ITALSKIER Member Account #: 43750 Join Date: Sep 2002 Posts: 13,650	See Steve Schwing....he,ll talk to ya... __________________ 2001 225 TTCQ MODS: /H&R SP.Springs/Bilstein Sp/Bailey DV/RH Cuprad Wheels18x8.5&18x10/25mm H&Rspacers(adapters)F>R/Ziex-Z 912 Falken's on:235/40/18-265/35/18/WINTER WEAR:225.45.17Nokian WR's on Stock 17 5 Spokes /Schwing's TTDA/GIAC-X Chip/Escort8500/Neuspeed Short Shift kit/Rear Red painted Calipers,Audi Rings/Bird Automotive Armrest/19mmRear Neuspeed Swaybar/Rear Harness Bar/1/2 KMAC for rear/Forge Hi-Flow Exhaust/Raffi Knob(Race -2)/Samco Intake Hose/IK-22 Densos/Descreened,Devaned/Mantis,with 2VDO Gauges Oil Temp and Volt/Dogbones/Defi D Boost Gauge.Pillar Pod/3.2 Rear Valence(modified)/4Bar FPR,MOFO/Telson(FG)3.2 Spoiler/Wilwood 13"BBK,Red 4 Piston Forged Calipers/Dr. SchwingsBoost Machine/Hella Horns/Quattro Sport Gl.Box Emblem/ECS tuning Poly Control Arm Bushings/EVO Phenolic Intake Manifold Gasket/Optima Redtop/Revo 93 on an xtra ECU/passenger side EURO Mirror/Mark 1 Arms/Rear cross drilled Zimmermans/Street Concepts 3 Piece Front Splitter w CF center/Riso Carbon Fiber Door handles/42DD Dwn Pipe/MT-90 TrannyOil/22mm Nuespeed front swaybar/Alcantara E Brake handle/Tyrolsport UG SMIC's(2)/http://us.fotolia.com/p/51995?order=nb_downloads&offset=96

10-15-2003, 04:35 AM	#5
Tee x2 New Member Account #: 60978 Join Date: Aug 2003 Posts: 361	Yeah, he's very helpful. He helped me out many times already :D

10-15-2003, 10:27 AM	#6
TTQR03 New Member Account #: 57401 Join Date: Jun 2003 Posts: 312	It's all about the "fuel/air" density of the incoming charge- ..The cooler the incoming air, the denser the "fuel charge" into the engine will be- A few degrees difference can make as much as a 7% difference in the power output- At this altitude (Denver) with a relatively "small" 1.8 litre engine, cold air makes a HELLUVA difference... __________________ img src="http://pictureposter.audiworld.com/57401/ttw061s.jpg"

10-16-2003, 08:00 AM	#7
Lightweight-USPowah AudiWorld Super User Account #: 25882 Join Date: Sep 2001 Location: Manhattan, NY Posts: 11,261	Yeah.. I feel the same way.. __________________ 5.7 Liters of Forced American Muscle: 2 + 8 = 715 6.0 Liters of American AWDrivin Muscle & 599ccs of Japanese Track Samurai (ninja style) http://public.fotki.com/johnjacobjingleheimer/

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