Parish8
Rhino1

 

8 instead of 7
lets see
pay close attention to what happens right before 8 opens
4 and 3 just got thru opening
Im guessing here but I would say
the direction of the airflow changes pulling some from the very rear
then 8 and 1 open
8 has to overcome the momentum of airflow heading back toward the front
form 4 and 3

now 7 and 2 open
and since 8 was just open the momentum is going more toward the rear
therefore slamming 7 full of air
making it lean making it more apt to burn

I wrote the GM engineers about the truck intake designs
and all I got from them was a grey area response

Basically what they said is.. it wasnt designed for anything other than stock
and I would be better off looking into the aftermarket

cant remember exact words
but thats it in a nutshell


Parish,

all that you said is very interesting
and what you saw with your afr proves it for me

Id also like to see that thread you spoke of
If you run across it, do you mind posting it up?

as far as NA vs FI
seems like a FI setup would be less affected to a certain extent

my reason being, you are filling all voids and air flows to the point of least resistance
where NA you get the full effect and start suffering from low VE and pumping losses

but then on the other hand with extreme setups such as yours
it isnt much comparison

as far as how much its affected
I think it all boils down to airflow demand and percentages

extreme setups being more affected
im still trying to comprehend putting down 1000 through a truck intake


great input guys, thanks

 

Bill I think you should buy the 8 wideband setup with individual injector control

 

I was talking to Kano about the intake and it suddenly dawned on me like a light shot down and I had a revalation.

For the past year and a half I have been plagued by fueling issues and incosistencies with B1 always being leaner than B2. I have rewelded the entire exhaust, swapped/replaced 02's, even gone as far as mashing some welders compound around the bungs and collectors.
ITS THIS ******* #7 I cant believe after all this time I never saw that, I get spuradic kr sometimes at WOT B1 is always reading at least 40-100mv leaner. The real test is when I swap intakes and the problems go away. I know there are others out there with the same problem. **** the truck intake

 

would be some good info...

Maybe one of our sponsors will

 

when i was running the stock 02's with boost my banks were prety close. .03 or so variance.

 

Good point
Ive read quite a few threads with this same issue

 

I think that huge hairdryer you had strapped to the front might have helped push the air more evenly
some have the problem and some dont Ive been looking for a reason Im glad I found it now Im wondering why some have the problem and some dont. I do see it more in NA engines than FI though. Im gonna make a seperate thread.

 

The Vic jr. has shorter runners, which means more power up top and less down low torque. Probably not so noticable in a 408 that makes a bajillion hp, but may be rough in the smaller cube engines.

Nice write up Kano.

 

so would possibly a larger plenum help that out???

like CHarris's h2 t/b elbow??

-erik