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Thread: Throttle Body

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  1. #1

    Default Throttle Body

    Hey guys hope everyone is having a great Holiday season. I was wondering, what do you guys think about switching my 85 454 burb over to a throttle body? Will a newer carb swap right in? Are there kits? Is it worth it?

    Thanks!
    Last edited by crane557; 12-15-2010 at 10:33 AM. Reason: mispell
    1985 c20 Suburban "Amtrack"
    7.4 liter project

  2. #2

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    It's currently carb, and you want to go to TBI, right? Well, you may gain some fuel mileage. You'd have to install a computer, the TBI (TPS sensor, 2 injectors, and I think another sensor on the TBI), an oxygen sensor, coolant temp sensor, and possibly a new intake manifold. It's really relatively simple. All the mods are on the intake with the exception of the exhaust. If you can pull a TBI, intake manifold, oxygen sensor, wiring harness, and computer off a truck for cheap, it might be worth it. Otherwise, I'd consider staying with the carb, and possibly switching to a 4-barrel with a light foot on the accelerator if this isn't already the case. TBI vs carb for performance, the 4-barrel carb would win any day because the TBI is only a 2-barrel.
    Christopher

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  3. #3
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    In addition to everything Crawdaddy mentioned, you'll also need a c.c. distributor & a knock sensor, & possibly a half dozen other things we forgot lol. I went the other way & switched my '88 TBI over to 4 bbl carbed with an HEI distributor for the simplicity, & more power & it actually gets better mpg than the TBI did. 11.9 vs. 8.1.. I would stick with what you have. It is easier for you to work on, & the wiring harness alone will make you wish you hadn't ever thought about TBI.
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    One word from me if you want to "Donor" getting a donor truck will make the switch very simple. Oh and stephan the wiring harness on the TBis really isnt to bad in my opinion. (i had to go thru 3 harnesses before i got the right one). But as mentioned for peroformance a 4bbl will beat the TBi becasue the TBi just isnt designed to flow as well.
    I am personally a fan of EFI. I can work on and repair an EFI system way easier than a carb (this is just because of the era that i grew up in) so it all boils down to personal preference.
    Mike

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  5. #5

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    WOW thanks for all the great replies! It sounds like I may have to stick with the current setup for now, besides who doesnt want more horsepower lol.

  6. #6
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    Quote Originally Posted by murdog94 View Post
    One word from me if you want to "Donor" getting a donor truck will make the switch very simple. Oh and stephan the wiring harness on the TBis really isnt to bad in my opinion. (i had to go thru 3 harnesses before i got the right one). But as mentioned for peroformance a 4bbl will beat the TBi becasue the TBi just isnt designed to flow as well.
    Good point Mike, (3 wiring harnesses before you got the right one)<-- This is only one reason I would talk a novice out of doing this swap.
    The donor rig would be a BIG plus..

    BTW Crane, I thought of a few more things you'll need. A new fuel pump 12-15 psi, & new style f.i. fuel filter & fittings, new fuel lines (2) either a "hard" pressure line, or one of the plastic with the woven metal covering circa 1988-up, & a return line to run the extra fuel back to the tank. You'll probably also have to fit a new fuel tank, as the attachment fittings for the top ring (stock tank) won't suit the new pump installation..

  7. #7

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    Oh...Yeah. The common conversion is going from TBI to carb. You almost never see it go the other way around. I totally forgot about the rest of the fuel system.

  8. #8

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    (0.0) wow doesnt spound very simple.

    Thanks

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