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RedDevil · 10-20-2013, 04:25 PM

Welcome!
You actually do not need to cover the headlights. Just seal all the holes around the headlights so no air can flow through. The stagnant air has the same effect as a clear cover; the raised pressure causes the air ahead to flow aside and over.

Also look at blocking part of the lower grill (I run a full lower grill block on my Insight all year round).
If you reduce the amount of air that flows in there, that will lower the under hood pressure just like plugging the holes between the lamps does.
I believe my lower grill block improves my economy by 5 to 10% during winter.

Need to add:
Monitor your air intake temperature if you block a substantial part of the front.
I bought a cheap in/out thermometer and put the outer sensor in the air intake nozzle.
Only once did I see the temperature raise to alarming levels (@ 40°C while stuck in a traffic jam during a heat wave), and I could then reduce it by switching off the A/C for a while.

10-20-2013, 04:25 PM	#2 (permalink)
RedDevil Master EcoWalker Join Date: Dec 2012 Location: Nieuwegein, the Netherlands Posts: 3,999 Red Devil - '11 Honda Insight Elegance Team Honda 90 day: 54.9 mpg (US) Thanks: 1,714 Thanked 2,247 Times in 1,455 Posts	Welcome! You actually do not need to cover the headlights. Just seal all the holes around the headlights so no air can flow through. The stagnant air has the same effect as a clear cover; the raised pressure causes the air ahead to flow aside and over. Also look at blocking part of the lower grill (I run a full lower grill block on my Insight all year round). If you reduce the amount of air that flows in there, that will lower the under hood pressure just like plugging the holes between the lamps does. I believe my lower grill block improves my economy by 5 to 10% during winter. Need to add: Monitor your air intake temperature if you block a substantial part of the front. I bought a cheap in/out thermometer and put the outer sensor in the air intake nozzle. Only once did I see the temperature raise to alarming levels (@ 40°C while stuck in a traffic jam during a heat wave), and I could then reduce it by switching off the A/C for a while. __________________ 2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut. lifetime FE over 0.2 Gigameter or 0.13 Megamile. For confirmation go to people just like you. For education go to people unlike yourself. Last edited by RedDevil; 10-20-2013 at 04:34 PM..