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V6 GV airbox into a 4 Cyl GV
Posted: Fri Jun 06, 2008 11:55 am
by 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
Posted: Fri Jun 06, 2008 12:06 pm
by 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?
Posted: Fri Jun 06, 2008 12:24 pm
by TheOtherLeft
cj wrote: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?
Posted: Fri Jun 06, 2008 1:08 pm
by 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.
Posted: Fri Jun 06, 2008 1:24 pm
by TheOtherLeft
Yeah I just had a squiz at the Ryco website. The GVs from 98-2005 use the same air filter
Posted: Fri Jun 06, 2008 1:55 pm
by 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
Posted: Fri Jun 06, 2008 2:04 pm
by TheOtherLeft
fordy1 wrote: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.
Posted: Fri Jun 06, 2008 3:51 pm
by fordy1
the filter was the same...
Posted: Tue Jun 10, 2008 11:59 am
by cj
cj wrote: 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.
Posted: Tue Jun 10, 2008 1:17 pm
by 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.
Posted: Tue Jun 10, 2008 10:30 pm
by 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??