How much power can be made with TBI? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Blue85 · 12-05-2004, 02:40 AM

I got an offer to buy a totaled 91 chevy truck with a 350TBI and a rebuilt 700R4, i was just wondering how much power can the TBI system handle? I would like my truck to have at least 350HP, can the TBI make this much power? Also who would have a wiring harness to make this worK(i can get all of the 91 wiring).

70 shorty · 12-05-2004, 08:42 AM

I dont' know the answer, but I saw on an episode of Horsepower TV where they converted the factory TBI to port Fuel Injection. The factory TBI was modified to only carry air, then fuel rails were installed on the new intake that came with the kit. I believe the kit even came with the necessary in tank fuel pump. I want to say it was an Edelbrock kit, but cant remember for sure.

68C15 · 12-05-2004, 08:43 AM

from past experience with customers rides I see no reason not to be able to get 350HP. since you have the factory TBI harness & ECM I would use that. it will be able to control the trans & would be the easiest in my opinion. just may take a little cleaning up (extra wires). if you need help I can get a diagram of factory & tell you which ones are not needed.
otherwise Painless does have them but I would save the $ for other things. (about $400)

superchevy · 12-05-2004, 10:31 AM

You can get 350hp out of a tbi...just be prepared to spend at least three times as much as you would with a carb motor. For eveything tbi, go to the Camaro/Firebird website www.thirdgen.org ...those Camaro boys have been playing with tbi for a long time. They helped me a lot when I was building my '93 (see sig).
As for me, I got tired of spending so much money for so little horsepower...remember a stock tbi flows basically the same as a 2-barrel carb. I just sold my '93 and bought a '77 Silverado. Thank goodness I'm back working with a carb! No more high dollar injectors, harnesses, chip burning...and on and on....blech.
Just my 2 cents,
SC

neonlarry · 12-05-2004, 12:03 PM

Here is some good reading on TBI:
http://www.goingfaster.com/spo/praisetbi.html

12-05-2004, 02:40 AM	#1
Blue85 Oilfield Trash Join Date: Sep 2003 Location: Raymore, Sk, Canada, Earth Posts: 3,171	How much power can be made with TBI? I got an offer to buy a totaled 91 chevy truck with a 350TBI and a rebuilt 700R4, i was just wondering how much power can the TBI system handle? I would like my truck to have at least 350HP, can the TBI make this much power? Also who would have a wiring harness to make this worK(i can get all of the 91 wiring). __________________ 14 Dodge 3500 Mega Cab 08 Dodge 3500 Mega Cab 87 Chev 3+3 4x4 80 GMC K10 High Sierra bone stock 70 Chevelle 350SS long term project 68 GMC 3ton Grain Truck/Garbage wagon 50 Pontiac 2 Door Coupe Project "I've got a shotgun rifle and a 4 wheel drive and a country boy can survive" Hank Jr. Last edited by Blue85; 12-05-2004 at 02:50 AM. Reason: wanted to add a question

12-05-2004, 08:42 AM	#2
70 shorty Where's my beer? Join Date: Oct 2004 Location: Glen Allen, VA Posts: 1,768	I dont' know the answer, but I saw on an episode of Horsepower TV where they converted the factory TBI to port Fuel Injection. The factory TBI was modified to only carry air, then fuel rails were installed on the new intake that came with the kit. I believe the kit even came with the necessary in tank fuel pump. I want to say it was an Edelbrock kit, but cant remember for sure. __________________ 70 C10, shortstep, .30 over 250,Hurst shifted 3 spd parts hauler. Holley 390, Clifford Intake, Header, ported cylinder head, unknown bigger cam. 79 Corvette L82, 4 spd, black, red interior, headers, flowmasters, and unkown bigger cam. '03 Grand Cherokee Laredo, 4.0 4x4 daily driver. 165K miles, and runs great '08 Tahoe LTZ 4x4 155K

12-05-2004, 08:43 AM	#3
68C15 blood type; Retumbo Join Date: Jan 2004 Location: next to my reloading bench Posts: 10,269	from past experience with customers rides I see no reason not to be able to get 350HP. since you have the factory TBI harness & ECM I would use that. it will be able to control the trans & would be the easiest in my opinion. just may take a little cleaning up (extra wires). if you need help I can get a diagram of factory & tell you which ones are not needed. otherwise Painless does have them but I would save the $ for other things. (about $400) __________________ Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card

12-05-2004, 10:31 AM	#4
superchevy Got big-block? Join Date: Jul 2000 Location: Austin, Texas Posts: 2,453	You can get 350hp out of a tbi...just be prepared to spend at least three times as much as you would with a carb motor. For eveything tbi, go to the Camaro/Firebird website www.thirdgen.org ...those Camaro boys have been playing with tbi for a long time. They helped me a lot when I was building my '93 (see sig). As for me, I got tired of spending so much money for so little horsepower...remember a stock tbi flows basically the same as a 2-barrel carb. I just sold my '93 and bought a '77 Silverado. Thank goodness I'm back working with a carb! No more high dollar injectors, harnesses, chip burning...and on and on....blech. Just my 2 cents, SC __________________ '68 CST SWB factory 396/T400 buddy buckets, a/c, ps, pb '72 Corvette convertible 454/4spd/ac, ps, pb '73 GMC Sierra Grande short wide 454/T400 ps, pb, ac '77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original '78 GMC Sierra Classic short wide 454/T400 ps, pb, ac '72 GMC Sprint SP454. 1 of 38 built. '73 GMC Sprint SP454. 1 of 71 built. '75 GMC Sprint SP454. 1 of 25 built. SOLD! '72 GMC K25 4x4 468/4L80e/NP205 build thread http://67-72chevytrucks.com/vboard/s...23#post4324423 SOLD!'55 Chevy gasser 496/4spd build thread http://67-72chevytrucks.com/vboard/s...96#post4324396

12-05-2004, 12:03 PM	#5
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,746	Here is some good reading on TBI: http://www.goingfaster.com/spo/praisetbi.html __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

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