Quote:
Originally Posted by DarkneSS
Lol heres a pic
Plastic should work fine because cold air will still shoot in from where the stock airbox grabs it. This will keep the plastic heat shield from getting too hot and creating head soak. The main problem is the warm air that sneaks in from behind the washer bottle area and filter.
I mean, the stock exhaust manifold is RIGHT there, a mere foot or so away so its going to create a lot of warm air that needs to be sealed off. If you notice all the intakes that have proven themselves on the dyno, roto fab, cai, etc all have a heat shield.
In reality the stock air box isnt that bad, its really just the filter that restricts. The tubing is 3 inch. |
Eeepp..... I'm sorry, but it doesn't overly suprise me that that intake slowed you down a bit. That heat shield isn't sealed to anything and the piping is all black plastic/rubber. Just one big heat soak. I realize the stock one is black plastic, but if you're looking to improve performance you need material that either reflects heat or doesn't absorb it well. The heat shield around the filter needs to completely enclose it and draw air from a cool source. And you have to be careful with where you locate the MAF sensor, too close to either the filter or a bend can change the reading and throw off your fuel trims. Also going to a larger diameter pipe you can move the sensor off center and not be getting a realistic pipe flow reading because velocity is highest at the center, and the MAF takes an average. I.e. flow is slower closer to the pipe wall, MAF thinks you have less air coming in so it trims fuel down to keep the ratio correct, boom lean condition.
Direct injection has nothing to do with wether you run rich or lean. that is strictly a delivery method for the fuel, which is administered by the computer, so if the computer is being tricked it can easily run rich or lean depending on the conditions.
anyway, this may be what's happening with the dual cone as well. The airflow characteristics inside the tube may be changed by the Y-fitting so it's essentially tricking the MAF readings and adjusting your fuel trims lean. Hence you're hardly using any.
There is ALOT more that goes into an efficient air intake design than just making a tube with a filter on it.