General Information on TBI in Later 80's Trucks - The 1947 - Present Chevrolet & GMC Truck Message Board Network

burger · 01-19-2008, 01:18 AM

Thanks for answering the questions that I've asked so far. I'm new to these trucks, so what's old hat to you is new to me.

My next question is a general one about the TBI found on later 80's trucks.

Is it any good? What type on injection is it? Is it an "electronic" QJet or is it more modern like the units found on early-90's trucks? Do they provide better mileage and driveability? Does anyone have pictures?

Thanks,
Ed

CLASSIC87' · 01-19-2008, 01:28 AM

I have had very good results with mine... no major problems. The last time I checked mileage i was getting around 17mpg... it will also depend on your running gear; and mine is a 350. I believe they installed the TBI between 87-95'... pic is attached, but kinda dark.

Anthony

TireSmoke420 · 01-21-2008, 07:34 AM

Quote:

Originally Posted by CLASSIC87'

I have had very good results with mine... no major problems. The last time I checked mileage i was getting around 17mpg... it will also depend on your running gear; and mine is a 350. I believe they installed the TBI between 87-95'... pic is attached, but kinda dark.

Anthony

how the heck are you getting 17 mpgs and im only getting 10

BLE 'BURBAN · 01-21-2008, 08:01 AM

Quote:

Originally Posted by TireSmoke420

how the heck are you getting 17 mpgs and im only getting 10

Keep from running with your foot in the floor all the time!!!

**Captkaos** · 01-19-2008, 01:51 AM

The TBI on the 87-91 versions on our bodystyle are the same as what is on a 88-95 trucks. Improved cold cranking, better mileage, better drivability. It is one year only in 1/2tons, 1987, and yes, it is electronic.

burger · 01-19-2008, 03:19 AM

Quote:

Originally Posted by Captkaos

The TBI on the 87-91 versions on our bodystyle are the same as what is on a 88-95 trucks. Improved cold cranking, better mileage, better drivability. It is one year only in 1/2tons, 1987, and yes, it is electronic.

I'm pretty sure I've seen '86 and maybe '85 trucks that claim to have EFI. Is this the same setup or something different?

Thanks,
Ed

Russell · 01-19-2008, 04:32 AM

Those are not EFI. Some of them have EST, which is Electronic Spark Control, and many have computer assisted carbs (CCC carbs), but they are not true fuel injection like the 87s are

**Captkaos** · 01-19-2008, 06:54 AM

There are some LATE year 86 trucks that will have the TBI, but in general, 1987 was the year model that went to TBI.

**Captkaos** · 01-21-2008, 09:41 AM

Mine has the 305, our last trip yeilded 22.5mpg @65.
I checked the city/highway (60/40) mileage and I normally get between 15.5 - 17 depending on how I drive.

rfmaster · 01-22-2008, 02:05 AM

I' m getting 17-18MPG at 65 in my retrofitted '75. Better performance overall. Cold-hot starts are nothing but a ancient memory.

//RF

01-19-2008, 01:18 AM	#1
burger Registered User Join Date: Sep 2005 Location: philly burbs Posts: 160	General Information on TBI in Later 80's Trucks Thanks for answering the questions that I've asked so far. I'm new to these trucks, so what's old hat to you is new to me. My next question is a general one about the TBI found on later 80's trucks. Is it any good? What type on injection is it? Is it an "electronic" QJet or is it more modern like the units found on early-90's trucks? Do they provide better mileage and driveability? Does anyone have pictures? Thanks, Ed

01-19-2008, 01:28 AM	#2
CLASSIC87' OL BLUU Join Date: Mar 2004 Location: WICHITA, KS. Posts: 1,065	Re: General Information on TBI in Later 80's Trucks I have had very good results with mine... no major problems. The last time I checked mileage i was getting around 17mpg... it will also depend on your running gear; and mine is a 350. I believe they installed the TBI between 87-95'... pic is attached, but kinda dark. Anthony Attached Images

01-19-2008, 01:51 AM	#5
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	Re: General Information on TBI in Later 80's Trucks The TBI on the 87-91 versions on our bodystyle are the same as what is on a 88-95 trucks. Improved cold cranking, better mileage, better drivability. It is one year only in 1/2tons, 1987, and yes, it is electronic. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

01-19-2008, 04:32 AM	#7
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	Re: General Information on TBI in Later 80's Trucks Those are not EFI. Some of them have EST, which is Electronic Spark Control, and many have computer assisted carbs (CCC carbs), but they are not true fuel injection like the 87s are __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

01-19-2008, 06:54 AM	#8
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	Re: General Information on TBI in Later 80's Trucks There are some LATE year 86 trucks that will have the TBI, but in general, 1987 was the year model that went to TBI. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

01-21-2008, 09:41 AM	#9
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	Re: General Information on TBI in Later 80's Trucks Mine has the 305, our last trip yeilded 22.5mpg @65. I checked the city/highway (60/40) mileage and I normally get between 15.5 - 17 depending on how I drive. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

01-22-2008, 02:05 AM	#10
rfmaster Registered User Join Date: Oct 2003 Location: OC CA Posts: 1,374	Re: General Information on TBI in Later 80's Trucks I' m getting 17-18MPG at 65 in my retrofitted '75. Better performance overall. Cold-hot starts are nothing but a ancient memory. //RF __________________ "The Beast" 1975 Chevrolet C20 longbed 350/700R4! with 3inch body lift Dual Flowmasters Super 40's! TBI retrofit completed (2007-07-29) New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17)

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