Quote:
Originally Posted by Nurburgring
That is not the EGR system. Itīs the air pump, most likely.
The air that is pumped by the air pump goes into the EXHAUST manifold to help complete the combustion of unburned gases during the warm up phase. This improves catalytic converter efficiency at a time when exhaust gases are quite rich. After the engine has done its initial warm up, the secondary air injection system stops working. Since it's part of the emissions system of the engine, it is monitored by the ECU.
Thanks for that pic fax0815 and Tyandriel. I hope the chassis braces are production-based and not just part of the cage used for the VLN race. It could mean they actually took chassis rigidity seriously.
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good explanation however, the FA20 is going to have D-4S. for cold start they most likely will follow the 2GR-FSE and use a modified stratified charge. on the 2GR, they use port injection on the intake stroke, and direct injection on the latter part of the compression stroke. not true stratified charge, but the effect is the same where the A/F mix is richer by the spark plug and leaner everywhere else. in short, i dont think such an air pump is necessary.
so what is it? i have a theory... look at this:
http://blogs.insideline.com/roadtest...-required.html
(Sorry for the giant pics)
look familiar? its from the 5.0 Mustang. it "pumps" certain frequencies into the cabin to get that great engine sound. what car also uses this? LF-A... who tuned the sound of the LF-A? yamaha. what other car did yamaha "tune"? FT...
anybody have a better explanation?
for reference this is the FB20:
