Analysis: A good case for Cold Air Intakes

I have been writing a series for the website covering street tuning of ignition maps. I believe I have come up with a dyno-free method that may or may not work; you’ll have to wait to find out.

The process requires a series of 3rd gear pulls at Wide Open Throttle (WOT) with varying offsets of ignition advance. I was expecting to see a strong correlation between power and ignition angle, with more advance giving more power; as the map that is currently in there is highly conservative.

The baseline was repeated to check consistency, but ultimately the consistency was poor. After a crawl through the data it became very obvious that the variation in engine inlet temperature had a great effect on engine power. See below.

Air Temperature Effect - 1.6 Pinto on a DGAV Carburetor , K&N Filter

Air Temperature Effect – 1.6 Pinto on a DGAV Carburetor , K&N Filter

I think this is a good argument for using a cold air feed! Which I had completely neglected. As the engine is now switching over to fuel injection I’m going to repeat the tests and hopefully yield a better result

A cold air feed will be present and accounted for; watch this space.