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Old 07-05-2011, 06:30 PM
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What applications can gm tbi be made to work for?

Is is possible to modify 305 tbi gear to run a big block? Im trying to look up info on tuning but it keeps turning up with more or less toruble shooting stories as opposed to "how to" guides.

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Old 07-05-2011, 06:40 PM
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TBI came on the 454SS which was a Silverado with custom graphics and suspension kits. It used a BB 454 with dirt low compression of around 7.9:1.
The TBI unit on it is somewhat higher flowing than those that came on small blocks, If memory serves the throttle body butterflies are a bit bigger.
To use it on a 454 it would have to be a identical build to what the factory used otherwise it throws the computer off. You can sneak in a few parts here and there to help it along without the computer noticing but not much.
To use it on another big block of different cubic inches you`d likely have to have a custom made computer. TBI really isn`t the hot tip for a performance engine, but they work really well for trucks used for rock climbing and etc since it can be operated to almost any angle. It`s also great for low end torque development. TBI as in injection isn`t real good, as it`s really a carb with a brain. The stock intake was awful as was fuel distribution. Aftermarket TBI intakes tend to help this out greatly. Just about all aftermarket TBI intakes have the plenum divider cut down so each cylinder is pulling off of both sides of the TBI.
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Old 07-05-2011, 06:49 PM
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well i know you may make jest of my 366 swap out but I have it running well and it really works ok for the budget I was on. I was hoping to give it injection to save what remains of fuel I can.. and also cold weather driving. I was hoping where it was a 366...I know...I was hopinf it was a 427,... i sear the last digit looked right...never noticed the huge 6.0 cast in the side. anyway,.... i was thinking where its not a massive amount bigger then a 350 in displacement, if some injectors and a chip would work.
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Old 07-05-2011, 07:28 PM
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TBI chips can burn anything needed, even new maps so larger cams can work ( tho they still have to be 'right for EFI )..

TBI adapter on the manifold will take care of the throttle body, but the TBI uses a special distributor that, I don't think the 366 or TD427 have anything like it. Later years might have somthing, 366 I'm pretty sure was used into the early 90's but, I'm not sure if any were EFI. If they were, that's your setup, but if not, then you may need to lock out an electronic distributor for it, which hopefully exists
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Old 07-05-2011, 07:59 PM
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could it be made to run with vaccum adv dist? or use the one from the 305?
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Old 07-06-2011, 07:58 AM
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To get the full benefit of TBI(mpg, cold start, etc), you need to use the computer controlled distributor. The 366 is a tall deck motor, which means the distributor is taller than a sb or standard deck bb distributor, so your 305 Dist wont fit. Aftermarket sells taller distributors, but Im not sure they sell one that will plug into your TBI harness. You'll have to check with the parts houses or manufacturers. Id atleast get a TB from a 350, if not from a 454. No sense in getting a 305 setup if you have to change the injectors any way, and the larger throttle bores of the BB unit would be better.
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Old 07-06-2011, 08:11 AM
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you can probably build a distributor that would work, the biggest question is- WHY? A well tuned carb can match TBI injection and sometimes even beat it in MPG. TBI sucks. TBI is good for one application though- rock crawling rigs that can go at steep angles where carb floats and circuits don't work properly.
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Old 07-06-2011, 10:23 AM
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tall decks dont.. i repeat do not have a taller distributor.. and a well turned carb will not out perform tbi in a daily driver situation...keep to the facts boys.
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Old 07-06-2011, 10:24 AM
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Sorry if I seem rude... I just grow tired of the 2 cents.

Last edited by Gordo84; 07-06-2011 at 10:38 AM.
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Old 07-06-2011, 10:44 AM
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Tall deck blocks do use a taller distributor. It's a known fact. The block has a taller deck height. As far as TBI with better fuel economy. It's a tossup. TBI works well for what it is, it can add a marginal amount of fuel economy.

You can't use a vac advance distributor without all the advance locked out, because EFI does it's own timing advance
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Old 07-06-2011, 11:41 AM
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Quote:
Originally Posted by matt167
Tall deck blocks do use a taller distributor. It's a known fact. The block has a taller deck height. As far as TBI with better fuel economy. It's a tossup. TBI works well for what it is, it can add a marginal amount of fuel economy.

You can't use a vac advance distributor without all the advance locked out, because EFI does it's own timing advance

You can run seperate fuel and spark control, its really no big deal. And a carb can beat the economy of a TBI system, carburetors can atomize the fuel better and are far more tunable than people think. A TBI system is basically a squirt gun for gasoline.
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Old 07-06-2011, 03:25 PM
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Umm nope/.... tall decks only use long distributors if you use an after market intake.... also im sure there are many previous posts about tbi vs carb fuel mileage... i own both.. dont say things like "carbs are better" a carb it a squirt bottle without a brain.. and by todays standard best suited to a lawn mower.. or a dodge.. now halt such foolish talk before some young buck puts a holley on his truck and has to learn the hard way
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Old 07-06-2011, 03:25 PM
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I figured it would.. my first carb swap (mistake) i used the tbi distributor and it ran fine.
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Old 07-06-2011, 03:38 PM
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oh might I add.. until october.. and then.. tbi went back on..to any whippersnappers out there...oh and it wasnt a stitch faster..and was worse on fuel
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Old 07-06-2011, 04:00 PM
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Quote:
Originally Posted by Gordo84
Umm nope/.... tall decks only use long distributors if you use an after market intake.... also im sure there are many previous posts about tbi vs carb fuel mileage... i own both.. dont say things like "carbs are better" a carb it a squirt bottle without a brain.. and by todays standard best suited to a lawn mower.. or a dodge.. now halt such foolish talk before some young buck puts a holley on his truck and has to learn the hard way
The TD block takes a longer distributor in stock form. Some of the aftermarket intakes available for them ( not many anymore ) are recessed at the distributor so a regular SBC/BBC distributor can be used... Carbs are fine, as is EFI. TBI was Chevy's first step into the EFI realm with the SBC's. They work ok, but it is fuel injected carb, by design, the mixture is wet going into the manifold just like a carb, so it can suffer loss of atomization just like a carb. They are very reliable, but where Port fuel injection shines, the TBI will always fall short
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