do hot days hurt your car's power alot?
7/5/11, 09:33 AM
#21
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Join Date: July 15, 2010
Location: Greenville NC
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Here's an example of real temps from my old Turbo'd Audi TT with a few Cooling mods in the intake tract (insulated air box, Big Front Mount intercooler, Manifold insualtors). As you can see you can minimize the effects of heat even on a turbo car with the right approach. The Mustang air intake is so good, my IAT's run right at ambient even with a Steeda open element filter..
From my Audi:
Last edited by Modshack; 7/5/11 at 09:35 AM.
7/5/11, 10:15 AM
#22
A Man Just Needs Some....
PCM controls air/fuel ratio to 14.7:1. A rich or lean mixture will damage the catalytic converters. PCM's first priority is to protect the cats. Hot air is less condensed and so it contains less oxygen. Causing a need for less fuel to maintain 14.7:1. Leads to less power. WOT+ hot air= less oxygen> less fuel> less power. Simplest way I can put it.
7/5/11, 10:29 AM
#23
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Only during Closed Loop (partial throttle) operation where A/F is controlled by the MAF and the 02 sensors. When you go WOT, the car goes into "Open Loop" where A/F is no longer controlled by the sensors, but rather by built in Fuel maps. The Mix will richen to about a 12-12.5:1 ratio which is better suited for High RPM, High load operation and develops maximum safe power there...
7/5/11, 10:32 AM
#24
A Man Just Needs Some....
Originally Posted by Modshack
Only during Closed Loop (partial throttle) operation where A/F is controlled by the MAF and the 02 sensors. When you go WOT, the car goes into "Open Loop" where A/F is no longer controlled by the sensors, but rather by built in Fuel maps. The Mix will richen to about a 12-12.5:1 ratio which is better suited for High RPM, High load operation and develops maximum safe power there...
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