Date: Fri, 03 Nov 2006 02:23:49 GMT From: - Bob - <uctraingnospamanet.com> Subject: Re: Cold Air Intake
On Thu, 02 Nov 2006 21:45:28 +0000, Colin Stamp <col.dustbinnospamp.plus.com> wrote: >I have to say, I disagree a bit here too. Like you say, the boost >*pressure* won't change, but if the air is cooler, then the mass will >be greater for the same pressure. Yes... exactly. I have some semi-scientific testing done. I use an MBC on my engine. Using an MBC eliminates the computer's ability to adjust boost (the very intent). However, the computer still maintains final authority and if it detects "too much" boost, it will cut the fuel, a rather radical, but effective way, to prevent overboost as set by the factory. I have the MBC set up to run well in the Summer. It boosts very nicely into the red and holds there - but never hits fuel cut. Recently temps dropped around here, by about 30 degrees average over Summer. First, I do notice a substantial increase in power, both seat of the pants as well as watching the boost gauge. In addition, I managed to hit boost cut accidentally the other day. I was not running WOT, just accelerating hard. Still, I hit it. So, how much of an effective boost increase do I get? One lb? Two? I don't know... but I know it's there, no question about it, and it's reliably detectable with the temperature change from the seasons. >I agree though, that any increase in >peak power due to just fitting a CAI will be pretty marginal. Yep, still agree.
