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01-26-2020, 05:59 PM | #1 |
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Location: Brooksville Ky
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94 Chevy truck Question
Looking at a 94 chevy C1500, wondering what has been done to gain a little more power from the 5.7 TB motor? Truck runs out great, already has a performance exhaust and also should mention it's a 4x4. The trans even shifts really nice. Wondering if the TB is a limiting factor since I've never done any performance mods to one of these.
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01-26-2020, 10:13 PM | #2 |
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Re: 94 Chevy truck Question
Well if it's a 4x4 then it's a K1500 and not a C1500.
I've got a 1989 and it seems to have plenty of power to me, but it's a five speed.
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Current/past Chevy/GMC trucks: 1958 Chevy C-60; 1965 GMC C-50; 1965 Chevy C-10; 1971 Chevy K-10; 1973 Chevy K-20; 1976 GMC C-20; 1977 Chevy C-10 Suburban; 1980 Chevy K-10; 1989 Chevy K1500; 1991 GMC V1500 Suburban; 2016 Chevy K2500 HD Other vehicles: 1988 Jeep XJ; 2011 Toyota 4Runner |
01-27-2020, 08:37 AM | #3 |
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Re: 94 Chevy truck Question
I always felt the TBI versions also seemed a bit "weaker". I went from a 96 with Vortec 350 to an 83 with a carbed crate 350 to a 94 TBI 350. and like you said it ran great, just seemed to be less powerful. I didn't notice much change on the 94 when we put in a new cat. It wasn't my truck at the time, but it did seem to help. I have not done any "modifying" to a TBI motor, nor do I know any one that has, short of cat back exhaust. All of the above were 2WD trucks with automatics.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
01-27-2020, 12:21 PM | #4 |
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Re: 94 Chevy truck Question
Seems to me like the power on the carb and TBI is about the same, except the TBI is more consistent. There is no "flat spot" at certain RPMs like you sometimes get with a carb.
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Current/past Chevy/GMC trucks: 1958 Chevy C-60; 1965 GMC C-50; 1965 Chevy C-10; 1971 Chevy K-10; 1973 Chevy K-20; 1976 GMC C-20; 1977 Chevy C-10 Suburban; 1980 Chevy K-10; 1989 Chevy K1500; 1991 GMC V1500 Suburban; 2016 Chevy K2500 HD Other vehicles: 1988 Jeep XJ; 2011 Toyota 4Runner |
01-27-2020, 07:43 PM | #5 |
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Re: 94 Chevy truck Question
I was wondering if the TB cfm or injector size would limit a cam change or even if I went with a 383. I'm just interested in torque for some towing.
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01-27-2020, 09:45 PM | #6 |
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Re: 94 Chevy truck Question
I think most of the difference is in the heads. The engine in my 83 was a 70's era 350, and the vortecs is way better flow than the TBI. I am sure you could tune up a TBI, just not sure how much control you have or tweaking that can be done with the factory one.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
01-29-2020, 12:21 PM | #7 |
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Re: 94 Chevy truck Question
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01-29-2020, 02:32 PM | #8 |
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Re: 94 Chevy truck Question
The TBI motor's limitations are the tbi (450 cfm stock), the cam (it's ****), and the heads (also ****). The 450cfm isn't too bad and can handle and upgraded cam to a degree but the computer and manifold vacuum are limiting factors in upgrading the cam much.
the link above for Harris Tuning will give you a wealth of info on the TBI setup and what can be done short of swapping the entire setup.
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01-29-2020, 10:50 PM | #9 |
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Re: 94 Chevy truck Question
Thanks, I found that link, I figured with a RV type cam, headers and a good exhaust it ought to run decent. Of course I'd get a chip done for it, the only thing that would hold it back is the heads but since I'm not concerned about revving the crap out of it they might be ok.
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02-28-2020, 11:45 AM | #10 |
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Re: 94 Chevy truck Question
Im working on building my 350 tbi, its getting vortec heads, and rv spec cam, and a new chip burnt to change the tune. im going for pulling power as I am on 35s with a 6 inch lift.
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1994 k1500, Oldredz71(ext shorty 4x4 6 in lift) 1998 S10ZR2 2005 Silverado 2500hd(tow pig) Made in the USA, just like my trucks |
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