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Old 10-12-2002, 11:12 PM   #1 (permalink)
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Holley TBI

Is the holley tbi systems any good? How do they compare to a good 4bbl carb and a multiport setup?
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Old 10-12-2002, 11:37 PM   #2 (permalink)
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Holley TBI

I haven't used one myself because everyone I know that has think they are a POS. Maybe they didn't instal it correctly or the application was wrong but the result was nothing but problems. And this isn't just one person but four different vehicles, although one was the port injection unit. One guy made a 1100 mile trip here for the nationals and had to stop and put the racecar carb on the van to make the last 300 miles. Holley reps worked on it all weekend and he left here with a borrowed carb (off my T-Bird) to get home.
The worse part of his weekend was he kicked a rod on his second time pass and ended up watching from the stands. Oh, by the way its an Oldsmoble.
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Old 10-13-2002, 05:34 AM   #3 (permalink)
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I tried it once, Really didnt like the system. It was hard to tune to a broad RPM range. It'd either idle smooth, or run great at wide open. No middle ground to be had, so I chucked it for a Holley carb and havn't looked back.
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Old 10-13-2002, 03:05 PM   #4 (permalink)
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Holley TBI

The TB is perfectly fine, it's pretty much the same unit used by Chevy for a dozen years on various trucks. The problem is the EFI computer from Holley - it's total crap.

Use a different computer with it, like the MegaSquirt, and you're golden. That's what I'll be doing.
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Old 10-13-2002, 08:43 PM   #5 (permalink)
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Holley TBI

Hey NasalGoat what TBI unit are you going to be using? And are you going to build the megasquirt unit your self? I want to follow your progress as I may want to try my self!
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Old 10-13-2002, 11:46 PM   #6 (permalink)
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Holley TBI

Yes, the Holley Pro-junkion is a sorry excuse for a FI controller. The problem is it is Alpha-N and analog. This is what I have on my '67. Have done a good bit of tuning to get it halfass good running As said the TB is ok, I've got the 900cfm 4V version soon to be controlled by a Megasquirt (waiting on my kit...). Now the newer Holley systems (D, Di, commander 950) did/do use an actual digital controller and are speed density which is better. I would expect they work a bunch better than the old analog system, although I have heard a few people complain about them too. I don't have any personal experience with them, so can't say if it is lack of ability on the part of the tuner or problems with the system.

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Old 10-14-2002, 02:45 AM   #7 (permalink)
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Holley TBI

Some say that TBI is crap compared to port injection due to the fact that the fuel has to travle through the intake manifold. How true is this? I mean a carb does the same thing!

Right now Im leaning towords a good carb setup so I wont have to worry about any electronics.

How much better are the newly designed carbs over the old ones?
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[ This Message was edited by: HitmanKB on 10/14/02 5:42pm ]
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Old 10-14-2002, 06:01 AM   #8 (permalink)
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Holley TBI

I've heard a few horror stories of the holley style injectors hanging open at the worst possible moment. A friend of mine had to buy a carb 750 miles from home so he could get his huntin truck home.
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Old 10-14-2002, 02:11 PM   #9 (permalink)
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Holley TBI

Edelbrock has just recently come out with its TBI setup for small block Fords, and it supposedly has a terrific computer management system. Assuming that you can get the TBI running correctly, I wonder how it compares to the 5.0 style multiport with the plenum? I wonder if the only real advantage to the TBI is the gas mileage, or, does it make it truly crisp and torquey like the multiport does? Any one know about this? The reason I like the TBI is simply because you can pretty much hide everything under a stock air filter and keep the retro look.
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Old 10-14-2002, 02:18 PM   #10 (permalink)
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Holley TBI

I thought the edelbrock setup was a multipoint setup with the injectors neat the ports? Are you talking about that or does the unit bolt on to a 4bbl intake manifold?
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Old 10-14-2002, 02:37 PM   #11 (permalink)
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Holley TBI

You're right. I just checked it out, and they refer to it as multipoint injection. But, it looks like a carb with two fuel rails. I suppose the fuel rails have the injectors that shoot directly into the cylinder. I guess I'm confused then about what is TBI vs. multiport/multipoint. I wonder now what the standard 5.0 type is called?
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Old 10-14-2002, 03:00 PM   #12 (permalink)
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Holley TBI

I think that multipoint and multiport are one in the same, edelbrock just used another name (I may be wrong). As far as I know 5.0 are multiport. TBI uses carb intake manifolds, and the fuel travles through the intake like a carb. I say that this is the closest to bolt on EFI as we will be able to get. I like the idea because carb intake manifolds for small blocks fords are cheaper than the efi versions and look near stock when the air cleaner is on, and if it ever acts up you can throw on your old 4bbl carb.
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Old 10-14-2002, 04:17 PM   #13 (permalink)
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Holley TBI

Edelbrock's looks like the "Carb with a brain", and they refer to to it as multiport or multipoint. It looks like they use their stock intakes, with holes drilled over each cylinder for the injector. The carb looking thingy must only pass air through it, making it a "dry" set up. It looks good to me, but I've got a lot more stuff to do on do on my car.
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Old 10-15-2002, 01:09 PM   #14 (permalink)
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Holley TBI

I picked up one of the newer Projection throttle bodies - the two injector kind - at a swap meet for $300CDN including the digital computer, which I'll sell on ebay to recoup the costs.

Multiport FI is obviously much better than TBI, but this way I don't have to pull my intake off and have injector bosses welded in, nor do I have to source fuel rails, a throttle body, etc etc.

As a starter it's a good place. Anything will be better than the Edelbrock carb I'm running now. Just waiting for my Megasquirt to arrive before I tear the car apart installing it!
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Old 10-15-2002, 01:44 PM   #15 (permalink)
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Holley TBI

I'm looking forward to hearing how the Pro-jection works. It seems real popular for off-road vehicles. Good luck.
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