SlowCar

iTrader: (4)

Graphs made from data obtained from utec log.

stock air box = the graph is pretty smooth
cone filter = the graph is so "saw-tooth"

This is real convincing evidence that the stock air box with stock paper filter allows the motor to pull as much air as a k&n cone w/o the fluctuation. Everytime there is a disturbance, the ecu will pull timing! My car feels much smoother, no more surging, going back from cone to the stock box/paper filter.

nadzerin

OK could you clarify what exactly is on the Y-Axis? It says hertz which means a frequency. But frequency of what exactly? Engine noise? Thanks.

Warrtalon

iTrader: (6)

That's Karman, which is air flow.

F&I-EVO

what about the stock box with K&N drop in?

SlowCar

iTrader: (4)

The stock box minimises turbulance that cause the anomalies. So you are good.

EvoTech

iTrader: (25)

I did this same test with the UTEC with the same results. Stock air box is the way to go for best performance.

edwin

iTrader: (65)

cool abner!

Warrtalon

iTrader: (6)

It reads the same as the stock box with stock filter but with a few more ponies.

SlowCar

iTrader: (4)

2 graphs showing maf affecting ecu timing

KILTERMAN

iTrader: (9)

Bump For Good Thread.

Evol_VIII

iTrader: (1)

Thanks for posting good info. The only mod on my '05 is an injen intake and upper IC pipe. I am thinking this is one of the reasons it is running ****ty. Going to put the stock stuff back on soon and try another route.

EvoTech

iTrader: (25)

Good idea. I put my stock airbox back and intake back on and made 370 hp on stock turbo. There is no restriction in the stock airbox for the stock turbo PERIOD!

mike1023

iTrader: (11)

yes but now what if you have the small batter kit which cant use the stock air box and also have burshur uicp. haha

SlowCar

iTrader: (4)

EvoTech

iTrader: (25)

Move the battery to the trunk and put the stock airbox bracket back. Better weight distribution and more room in the engine bay.