TBI air filter housing modification

[mudbuggy]

I have an 89 GMC V1500 suburban, which has a 350 with the 7747 computer to control it. I have been thinking about modifing the housing to allow more air so I can alter the air fuel ratio on the chip (I don't know if I'm using the correct verbage so don't have a cow). I've seen a lot of tbi units modified to allow more air to flow into them, but I don't know if I want to go that way (yet). I do know that I am running lean at times, so I am attempting to think past the next few steps more over further down the road. I've heard about the salad bowl mod, but I'm a fabricator so I'm attempting to get some ideas of what is possible or at least how far I need to go. Once I get the batteries in the back of the truck I can worry about how I'm going to feed the housing, but for now I am attempting to focus on the housing itself.

 

[sweetk30]

tbi mods easy and fast for more cfm of air un restricted.

pod spacer bolt in deal.

mill the lips off the tbi body were the air drops in to the 2 ports. this = less restriction/turbulance.

and salad bowl unit . and open up the air cleaner like i did.

write up here http://coloradok5.com/forums/showthread.php?t=291456

and read up in injection section on lean conditions stock . most = to low psi and volume of fuel pressure. get a good gauge and install it. then run it and watch it. to do a good tune you will need to know 100$ what ya got.

look here for psi gauge http://coloradok5.com/forums/showthread.php?t=291856

 

[ryoken]

the salad bowl mod,

 

[mudbuggy]

Yea that's the crap I'm trying to avoid. I've done the pressure guage deal too. I think I'm a few steps ahead of you on this topic.


There a very large amount of reading material at gearhead diy (btw)

The fuel guage is the first on the right. It's in the blue backlight (matches my radio)


My purpose of this thread was to exponge upon other persons that might have trampelled in my footsteps prior. I really didn't want to or need to (not tha I know it all) find more information about the topic, mearly attempting to inquire about others who have played with different designs or theories.

 

[mudbuggy]

YEA THAT'S THE **** I WANT TO LOOK AT!

I love that shot 'down the throat'!

 

[ryoken]

wouldn't be all that difficult in sheetmetal.... flat sheet wrapped into a cone, yada..... could even weld it up to a stock unit... do the mock up with oaktag templates...

 

[mudbuggy]

funny that you say that!!!

I'm trying to remember the formulas for cones and **** like that

****in math, I hate that ****, but I would be able to do what I do in a day with out it!

I'm trying to figure the rise and run, I think if I figure on a rise of 2.5" then I should fit under the hood, factory height that is. The factory metal is 22 guage, of course that's after its been stretched and heated and cooled for 25 years, guess I can't mig, going to have to tig, double up on my pain meds so I can keep a steady hand just hope I don't fall asleep.

I don't think I'll do the ram air type of thing, I mean what the hell do I do when I drive through a flock of flying frogs??? That could be messy, and **** up my truck.

I really like that fabbin of fibers, what happens when it rains? I know you don't drive the truck in the rain, right? jk no really?

 

[ryoken]

ya mean the filter itself? it's an oiled washable, they stay pretty good with moisture.. plus it'll have a prefilter... but I don't expect to have any issue with driving it in the rain... the hood has an overhang in the back, which will also have a foam prefilter and grill...

 

[mudbuggy]

I spy said the fly. Didn't know if you had the idea from the smokey and the bandit car.

Damn fine fabbin in fiber. Damn fine!!!

Would you happen to remember the dims of the cone on the bottom?

Is that a 14" filter?

I'm assuming that's a 6" tall filter?

 

[ryoken]

yes, it's a 14" x 6"


and I have procharger salad bowl right here in the living room, the opening is 5"

mine is essentially the same... and yes, it's a function of that angle from inside the filter, to the mounting opening and factoring in how much height you want... I actually used a wooden salad bowl for the mold for the fiberglass... and mine does sit a fair bit higher than the procharger...

keep in mind I have a tbi spacer on a stock intake, and that 6" is sitting right below a 4" cowl hood... off the top of my head, to run a 6" under a stock hood, the salad bowl would probably wanna be about as high as the store bought one, but a much wider opening at the top to get over to the filter..

 

[ryoken]

this shot gives a good idea of the height needed for that 4" cowl... even with the 6" filter....

 

[mudbuggy]

Update from my old ass blackberry

5 3/32 I.d. 9 9/16 o.d. 2 1/2" tall. gives me a 60 degree slope. If I get time later I might tig it up, if not then sometime tomorrow.

EDIT- tried to upload pics from my phone, didn't work. First two are what I was going to upload, the rest is well the rest!

Only problem is the thinnest metal that I had on hand was galvanized.

 

[magik235]

Here is a picture of my setup.

 

[mudbuggy]

Got the very basic format together. Ran into a lot of problems tigging the thin as hell 24 guage factory parts to the galvanized 18 guage sheet steel. After a few sessions of welding for 3 minutes and cleaning for 5 minutes I got it where I can use a filler to seal it. This is not the final product, but it will allow me to make patterns and to get some good data for the computer. Least I have a 3 day weekend to drink lots of milk lol. I did get to seal it up before I left.

 

[79rustyk10]

Ryoken are you still planning on making the Chevelle cowl induction flapperwork with your cowl hood?

HiJack off.

I did the mod where you grind the lips off the top around the throttle bores and and smoothed it all out. Its not hard at all, but that truck has been sitting for a couple years since I did that so I can say if it helped.

 

[ryoken]

I wont be doing it for quite awhile, but I am taking it into consideration while doing the current stuff... plus i still need to acquire a couple other parts to make it flap eventually...

it's completely frivolous, so that get's it bumped to #57 on the "list"....

I actually started working on it again today..... first time in 6 months...

 

[shady]

$7

Much simpler, and stainless little bit of vaccum line around the edge for a seal.. done. I'm sure there are better actual salad bowls out at the stores, but this one was perfect and at the first store I walked into