anyone cut up a stock airbox?

[Mike1331]

The stock air flow is pretty restrictive I want to cut at least one side of the airbox off will this cause any problems. I have an 87 4.0. There seems to be a sensor at the initial intake opening is this a maf sensor or can I take it off and cut the whole side out?

 

[rockwerks]

The stock air flow is pretty restrictive I want to cut at least one side of the airbox off will this cause any problems. I have an 87 4.0. There seems to be a sensor at the initial intake opening is this a maf sensor or can I take it off and cut the whole side out?

yues you can but why?

 

[Mike1331]

More power.

 

[ErikL]

i have done this on a few other cars.... i cut the box everywhere except where the clamps hold it together, and where it bolts down..... there was alot more flow, but its all hot air..... i dont know how much it helped, but it made the other cars sound cool

 

[Mike1331]

can I just cut the whole initial inlet off w/ the sensor on it. Or should that stay.

 

[Mike1331]

I was just going to cut off the two sides facing away from the engine. For a little less hot air and insulate the whole system.

 

[ErikL]

leave the sensor alone ,it will run like garbage and get horrible mileage..... if it runs at all.... i would leave the top part of the box alone, just cut off the sides of the air box

 

[Mike1331]

Okay im off to it thanx.

 

[ErikL]

let me know what kind of difference you find..... before and after pics would kick ass too.... its something cheap and easy we can all do

 

[Mike1331]

Ok I just went and looked at it and the "sensor" I was talking about seems to be the opener for the inlet that lets in the hot air from the exhaust manifold is this really necessary?

 

[ErikL]

hmmmm could you take a picture and put it up? i cant think off hand what that would be

 

[The Stampede]

that inlet is there to aid in heating the engine quicker in cold weather... will not effect anything other than getting up to opperating temp within a certain amount of time

 

[Mike1331]

Well I took pics of before and after but cant seem to find my photo loader/charger for the digi. I'll look some more and post em tomorrow. I drove around for a couple hours and in stop and go it runs 10 degrees hotter but seems to run 5-10 degrees cooler at speeds above 45 As far a performance I notice a slight increase in power from 1st-3rd gear range. I'd say w/ a k&n you'd get 3.5 horsepower maybey 4.5 if you insulated everything.

 

[Mike1331]

Well I took pics of before and after but cant seem to find my photo loader/charger for the digi. I'll look some more and post em tomorrow. I drove around for a couple hours and in stop and go it runs 10 degrees hotter but seems to run 5-10 degrees cooler at speeds above 45 Must be from taking out the hose from exhaust manifold. As far a performance I notice a slight increase in power from 1st-3rd gear range. I'd say w/ a k&n you'd get 3.5 horsepower maybey 4.5 if you insulated everything.

 

[ErikL]

sweet.... thats something that can always be added to also..... good job being the test dummy for us all

 

[Dr. Dyno]

Read this. You'll find all you could possibly want to know about how to modify your airbox for performance.

http://www.jeep4.0performance.4mg.com/ramair.html

 

[Mike1331]

Thanx dr. dyno ive been checken up on your site for the past year now but wanted more than 50% more flow than stock and it has made a noticable difference. You put out great work and thurough write-ups thanx for all your contributions to the xj community. I'm at work now but will post airbox pics when im off.