Lean burn Honda Civic sedan: 93 Civic d15z1 swap into LX 4 door (VLX)

[California98Civic]

Originally Posted by slownugly

Nice gauge. I'm not familiar with it, but I looked it up online. Are you going to tune lean burn or just monitor it?

Originally Posted by slownugly

I have a very very slick idea for the intake do stay tuned.

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[slownugly]

I'm just going to monitor it. In the future I can use this to data log if I want to try my hand at chipping. It even comes with a software program for a laptop and output plugs.

When lean burn kicks in the afr should jump to 18:1 or more. Lean burn is kinda hard to feel in this car.

[slownugly]

O2 sensor bung welded in. Also got the warm air intake pipe welded in. I need a 45 or 90 degree pipe yet to point it towards the air box










As you can see in the last pic hot exhaust gases will engulf that pipe in the converter and heat the air up in the pipe. Which will then be sucked into the air box via flex tubing. The finishing touches for that are to come as well as the afr gauge install

[Jakins]

That's incredible!!!

[slownugly]

Thanks haha. The welds could've been nicer around the pipe but I had to fill some gaps. She seals though. I had to throw an old o2 sensor in to plug up the bung. The pipe is out of the way inside the converter so it doesn't block any flow or loose power. Also I drove it for 15 min and stopped to get some food the pipe had plenty of warm air inside of it. Also the inner hole of the tube is facing the block so it will suck hot air off of that after its warm.

[MetroMPG]

Neat! You make another passage and run coolant through it to heat up the engine faster. Toyota does this with its latest Prius.

(PS: at this point I will also officially register my wish that people would leave cats functional. Not intending to start an argument - we know the points on both sides.)

[slownugly]

To be honest I would have left it functional but I got it used. It was completely plugged with carbon. I decided to ream it out instead of buying a 200 dollar converter. I'm all for functioning cats especially with a Vx. Otherwise it's a joke in my opinion. A civic hx that gets 40+ mpg fails emissions for a 420 cat code but a suburban that gets 10 mpg passes fine. Like my late grandfather said in regards to vehicle emissions" when you can stand in a garage wih a running vehicle and not get carbon monoxide poisoning THEN you are doing something"

The heater hose is a great idea too. Only thing I'd be worried about is getting a leak in it

[slownugly]

Almost done. I ran out of time. I have to make a hole in the lower airbox for the pipe yet. Hoping it will be done at lunch tomorrow

[slownugly]

Warm air intake is done. On the initial run I noticed the engine heated up quickly. I also noticed a slight loss in power but that's to be expected. When I got home from my 65 mile commute I felt the pipe and it was warm. Not sure about mileage yet or intake air temps.

[2000neon]

Is the plastic tube that runs from the filter box to the throttle body as warm as the one you made? If it isn't getting as warm as your first intake tube, it might be worth insulating it as well to try and keep the air warm all the way to the throttle body. You might even be able to slip the factory inlet tube inside some of the metal ducting you used. If the plastic factory inlet tube does get warm though, well then just ignore me, Lol.

Looks good though, great idea.