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TBI Bridge Delete; Pictures of how I did it
Topic Started: Jun 10 2014, 11:05 PM (1,919 Views)
perfesser
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Elite Member - Former Metro owner

The TBI bridge delete has been discussed quite a bit as a way to allow the engine to breathe better by removing the restriction of the bridges that hold down the air housing and the filter. Without going into a step-by-step procedure (do a search, it's easy to find) here is what mine looks like now. Lots more open space around the TBI throat.

I used part of the large bridge to make a couple of hold-down clamps for the air filter housing bottom.

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The filter itself is fastened to the top of the housing.

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And from the outside it looks no different from a stock housing. But the air intake into the TBI is less restricted.

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You'd never guess there was anything unusual happening inside, would you?

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snowfish
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Basic GearHead

Nice work, Perfesser! :thumb And you Did use LocTite Blue, right? :news It Is your friend, you know. ^o) Hate to have the engine swallow something it's not supposed to. :die
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perfesser
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Elite Member - Former Metro owner

What you don't see in the pics is the large piece of stiff plastic on the other side of the filter. The hole in it is smaller than the bolt, so it is threaded through it. Before putting it in the housing top, the filter, strap, bolt and plastic form a single assembly. The wingnut actually serves as a sort of locknut to keep things from moving around.

I have a nice Detroit 6V71 supercharger in my classroom. Well, it was nice until someone dropped a nut down it! I'm sensitive to the thought of foreign object damage. As a matter of fact, in one of the TBI delete threads, you'll find me asking about that very thing!

Thanks for your concern! :D :D
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Stiffchezze
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Sir Metrologist

:thumb

:O
Somebody stole your clutch cable! :lol
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Bad Bent
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Facetious Educated Donkey

Looks like they helped themselves to the radiator also! :scared :oshit

:thumb :thumb Beautiful engine.
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perfesser
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Elite Member - Former Metro owner

Stiffchezze
Jun 11 2014, 10:09 PM
:thumb

:O
Somebody stole your clutch cable! :lol


:O :O :O So that's why the pedal felt so light!!!! :O :O :O


Bad Bent
Jun 11 2014, 10:57 PM
Looks like they helped themselves to the radiator also! :scared :oshit

:thumb :thumb Beautiful engine.


Just when my wife has started adding everything up :( :( and complaining about how much it costs, too!! Talk about bad timing!!! :'( :'(

Guess I'll just have to run without 'em! I can always use that HF tire inflator pump to blow air through the cooling jacket. Think of the weight savings for hypermiling!! :D :D :D
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faygoninja


is this really worth doing for mpg's or is it more ascetics?
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Coche Blanco
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Troll Certified

Neither, it's performance related.
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faygoninja


oh so i get more out of my 1.3, next project....wait i have too many :P soon then, very soon....
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perfesser
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Elite Member - Former Metro owner

faygoninja
Jun 11 2014, 11:31 PM
is this really worth doing for mpg's or is it more ascetics?
I don't know, but I was in the area anyway ... :D :D :D

If it's only performance, hey, it's a 3/5!! I'll take any help I can get!!
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Bad Bent
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Facetious Educated Donkey

faygoninja
Jun 11 2014, 11:31 PM
is this really worth doing for mpg's or is it more ascetics?
Coche Blanco is correct.

Question comes in on how much is gained. I recall doing the mod with two or three other things so I can't say I noticed any increase in throttle response. :-/
It has only been a minor inconvenience since my Geo has not had it's air cleaner off in a while. Cleaning the filter is no problem. If you need to get under the housing for the hoses, PCV valve, coolant hoses, alternator, starter or TPS you have to undo the two bolts.

On the other hand for a second before I deleted the bridge I thought about the bridge acting as a "Tornado Air" thing, which "creates a vortex or swirling effect to the engine. The result is improved airflow into the engine combustion chamber, causing a more efficient mixture between air and fuel. ". ...but does not actually work.
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faygoninja


The idea is sound though. Maybe there is a better way to get it to function
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georandy
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faygoninja
Jun 12 2014, 04:32 PM
The idea is sound though. Maybe there is a better way to get it to function
:gp
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perfesser
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snowfish
Jun 11 2014, 12:31 PM
Nice work, Perfesser! :thumb And you Did use LocTite Blue, right? :news It Is your friend, you know. ^o) Hate to have the engine swallow something it's not supposed to. :die
For those of you who expressed concern :shake :shake about the way I put the filter into the housing, I was in there again today and just for the heck of it I changed things a little.

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All y'all happy now?? ^o) ^o)

And yes, I did use a dab of blue on it!
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Hanuman
"The Almighty Grounds Cleaner"

Bad Bent
Jun 12 2014, 03:52 PM
The result is improved airflow into the engine combustion chamber, causing a more efficient mixture between air and fuel. ". ...but does not actually work.
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...but does not actually work.

........works very well on engines with straighter intakes, or intakes that curve in the same direction as the spin of the vortex.

the problem is no two intakes are alike, you need to custom build the vortex generator to match the engine. the direction of the spin must match the intake. also, the "tornado" itself is a poor design, it creates a very very weak vortex.

both of my subaru legacys loved the tornado.
my 1998 pontiac sunfire didnt change much....heated fuel worked better on this car. 36-38 mpg
2001 kia spectra loved it. pulled hard right to 6500 rpm 39 mpg
1997 buick century....no change
1994 eagle talon......no change
1998 toyota corrolla increase in power, no change in FE
.....................................................................................................
1983 honda accord custom made vortex generator, non heated fuel. went from 23 mpg city to 45 city.
1994 turbo subaru legacy, custom vortex generator, super heated fuel, went from 12 city to 24 city......i couldnt over boost that turbo enough to make the engine ping....i could blow the intake hose off the throttle body with over boost!


this is what I experienced while trying it multiple times on multiple cars.
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