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| TBI Bridge Delete; Pictures of how I did it | |
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| Tweet Topic Started: Jun 10 2014, 11:05 PM (1,919 Views) | |
| perfesser | Jun 10 2014, 11:05 PM Post #1 |
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Elite Member - Former Metro owner
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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. ![]() The filter itself is fastened to the top of the housing. ![]() And from the outside it looks no different from a stock housing. But the air intake into the TBI is less restricted. ![]() You'd never guess there was anything unusual happening inside, would you?
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| snowfish | Jun 11 2014, 12:31 PM Post #2 |
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Basic GearHead
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Nice work, Perfesser! And you Did use LocTite Blue, right? It Is your friend, you know. Hate to have the engine swallow something it's not supposed to.
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| perfesser | Jun 11 2014, 04:03 PM Post #3 |
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Elite Member - Former Metro owner
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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!
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| Stiffchezze | Jun 11 2014, 10:09 PM Post #4 |
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Sir Metrologist
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![]() Somebody stole your clutch cable!
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| Bad Bent | Jun 11 2014, 10:57 PM Post #5 |
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Facetious Educated Donkey
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Looks like they helped themselves to the radiator also! Beautiful engine.
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| perfesser | Jun 11 2014, 11:21 PM Post #6 |
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Elite Member - Former Metro owner
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So that's why the pedal felt so light!!!! ![]()
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!!
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| faygoninja | Jun 11 2014, 11:31 PM Post #7 |
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is this really worth doing for mpg's or is it more ascetics? |
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| Coche Blanco | Jun 11 2014, 11:33 PM Post #8 |
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Troll Certified
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Neither, it's performance related. |
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| faygoninja | Jun 11 2014, 11:38 PM Post #9 |
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oh so i get more out of my 1.3, next project....wait i have too many soon then, very soon....
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| perfesser | Jun 12 2014, 12:51 AM Post #10 |
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Elite Member - Former Metro owner
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I don't know, but I was in the area anyway ... ![]() 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 | Jun 12 2014, 03:52 PM Post #11 |
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Facetious Educated Donkey
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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 | Jun 12 2014, 04:32 PM Post #12 |
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The idea is sound though. Maybe there is a better way to get it to function |
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| georandy | Jun 12 2014, 06:58 PM Post #13 |
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| perfesser | Jun 13 2014, 01:57 PM Post #14 |
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Elite Member - Former Metro owner
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For those of you who expressed concern 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.![]() ![]() All y'all happy now?? And yes, I did use a dab of blue on it! |
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| Hanuman | Jun 13 2014, 08:10 PM Post #15 |
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"The Almighty Grounds Cleaner"
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........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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Welcome to the all new Geo Metro Forum. We hope you enjoy your visit.







And you Did use LocTite Blue, right?
It Is your friend, you know.
Hate to have the engine swallow something it's not supposed to.


soon then, very soon....



7:58 PM Jul 10