V6 GV airbox into a 4 Cyl GV

[TheOtherLeft]

Does anyone have a pic of the V6 GV (around 2002 body shape) airbox?

I'm looking into changing the airbox in my J20A engine to a V6 one and am wondering if it will fit as it will increase airflow. I don't have ABS so there's quite a bot of room aft of the factory airbox.

Will having a larger airbox cause problems, i.e. will it lean out the mixture or will the ECU adjust for it?

I heard somewhere that it's illegal to use larger airboxes as it changes something - lean's out the mixture or something???

Cheers,
Ben

[cj]

Ben,

They use the same air filter. Have you measured the pressure drop across your airbox to know if it causing a mjor restriction?

[TheOtherLeft]

Ben,

They use the same air filter.

Double Doh!!!! And here I was thinking about a quick and easy mod.

So does that mean the V6 is being restricted by a smaller air filter?

[joeblow]

last year i put a 2.7 v6 in a four banger vit, air piping was the same diameter, and the box almost identical dimensions.

[TheOtherLeft]

Yeah I just had a squiz at the Ryco website. The GVs from 98-2005 use the same air filter

[fordy1]

I fitted a snorkel to a 05 XL7 and found the pipe into the airbox was bigger by 5mm radius compared to all other GVs

[TheOtherLeft]

I fitted a snorkel to a 05 XL7 and found the pipe into the airbox was bigger by 5mm radius compared to all other GVs

But is the air filter the same size? I thought it was.

The air filter size would be the biggest restriction hence trying to find a bigger one.

[fordy1]

the filter was the same...

[cj]

Have you measured the pressure drop across your airbox to know if it causing a major restriction?

Well?

It seems to me that you are making an assumption that the airbox/filter is a major restriction but I still want to know if you have measured the pressure drop to prove this.

[Gwagensteve]

Or flowbenched the housing to figure out what it can flow?

My guess is you cna put the the worlds biggest filter on that motor and there won't be a measureable performance change.

Steve.

[murcod]

There are at least two different types of air filters for the V6 GV's. I know because the local dealer took a guess and supplied the wrong size/ shape for my 2.7l XL-7.

One is square at both ends and the other has one end more rounded (<- mine.)

So, chances are there is a larger airbox out there, or at least there's something different! It might be the post 2003 update XL-7's that are different, mine's a 2004??