s10 (s15) economy - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 05-03-2007, 05:56 PM   #1
Registered Member
 
Join Date: Apr 2007
Posts: 8
Country: United States
s10 (s15) economy

hi all, i just traded a couple of three wheelers for an 83 gmc s15. the engine (2.8 liter) is bad, but it has a 4 speed and 3.08 gears in the rear.

it is an extremely ugly truck, but that doesn't bother me none.

the previous owner couldn't tell me exact mpg numbers but was pretty sure it was around 18-20.

i was thinking that i could put another engine in, new fluids in it, do a grill block, electric fan (its current fan is solid, not even a clutch) an alignment, recurving the ignition timing while adding a hotter coil, and replacing the rochester POS with a weber Progressive that i have, dual exhaust and maybe eventually an RV cam it it seems like it would be worth it

I would much rather have a 4.3, but i would have to put bearings into an s10 t5 that i have, but i would probably need a different clutch/flywheel and a bellhousing as well.

does anybody know what these usually get for mpg? any guesses as to what i could get it up to?
__________________

__________________
1987 volvo 740 turbo
smokes like a freight train!
~20.68 mpg
gasssaver87 is offline   Reply With Quote
Old 05-03-2007, 06:02 PM   #2
Registered Member
 
rvanengen's Avatar
 
Join Date: Apr 2007
Posts: 230
Country: United States
Quote:
Originally Posted by gasssaver87 View Post
hi all, i just traded a couple of three wheelers for an 83 gmc s15. the engine (2.8 liter) is bad, but it has a 4 speed and 3.08 gears in the rear.

it is an extremely ugly truck, but that doesn't bother me none.

the previous owner couldn't tell me exact mpg numbers but was pretty sure it was around 18-20.

i was thinking that i could put another engine in, new fluids in it, do a grill block, electric fan (its current fan is solid, not even a clutch) an alignment, recurving the ignition timing while adding a hotter coil, and replacing the rochester POS with a weber Progressive that i have, dual exhaust and maybe eventually an RV cam it it seems like it would be worth it

I would much rather have a 4.3, but i would have to put bearings into an s10 t5 that i have, but i would probably need a different clutch/flywheel and a bellhousing as well.

does anybody know what these usually get for mpg? any guesses as to what i could get it up to?
Way back when (late 80's), my father had an 84 S-10 Blazer 2.8 5-speed that seemed to be getting about 22 on the highway.
__________________

__________________
-- Randall


McIntyre's First Law: "Under the right circumstances, anything I tell you may be wrong."

O'Brien's First Corollary to McIntyre's First Law: "I don't know what the right circumstances are, either."



rvanengen is offline   Reply With Quote
Old 05-04-2007, 01:03 AM   #3
Registered Member
 
caprice's Avatar
 
Join Date: Feb 2007
Posts: 114
Country: United States
ouch Bite the bullet Go for an "iron duke" 2.5 4 cylender. very common in other cars besides the s10 (translation: easy to find at the salvage yard). Plus "no one likes them" because it has the "weaker" engine. (translation: costs less to buy.) Save weight and friction, install a S10 manual steering box, if not equiped. You will apreciate narrower front tires though!

With a 5 speed and TBI:
24 City
30 Highway

Better milage than my Daewoo Leganza! haha How sad is that?

I am starting to wish I put a used iron duke in my caprice. The car weighs the same as a s10, and more areo dynamic than a truck. It would would compliment a 6 speed transmission very nice! That definatly would be "out of the box" a 30+ MPG from a oversized car! I never need the power from my 350 anyway.
__________________
David
85 Chevrolet. 30 MPG or bust!
caprice is offline   Reply With Quote
Old 05-04-2007, 06:31 AM   #4
Registered Member
 
Join Date: Mar 2007
Posts: 1,138
Country: United States
I was thinking Iron Duke too. But it sounds like maybe he wants a little more power.

The Caprice came with a V6 in the '80s, I think. Maybe one of those would be an easy swap?
__________________
Bill in Houston is offline   Reply With Quote
Old 05-04-2007, 06:37 AM   #5
Senior Member
 
BumblingB's Avatar
 
Join Date: Feb 2009
Posts: 341
Country: United States
Location: NW Florida
There's always the possibility of a "sloped" bed cover. I keep hearing people rave on about how it netted them huge increase on HWY mpg.
BumblingB is offline   Reply With Quote
Old 05-04-2007, 07:07 AM   #6
Registered Member
 
Join Date: Apr 2007
Posts: 37
Country: United States
I'm working on a belly pan for my and might have it done in a few days. I'll post pics when it's down. I think, and Phil Knox does too, that the belly pan will net better results than a sloped cover. A truck's underside is a aerodynamic engineer's nightmare. There's no attempt to smooth anything. The flatest surface is the gas tank and the rear bumper and frame members looks look as though they probably act like a drag chute for any airflow that makes it that far back. It's a mess and I can't wait to see what this does for my highway mileage.

John David
__________________
jdham137 is offline   Reply With Quote
Old 05-04-2007, 08:17 AM   #7
Registered Member
 
Join Date: Oct 2005
Posts: 1,978
Country: United States
Celebrity Engine?

Quote:
Originally Posted by caprice View Post
ouch Bite the bullet Go for an "iron duke" 2.5 4 cylender. very common in other cars besides the s10 (translation: easy to find at the salvage yard).
Is that the one they put in the Celebrity? If so the Auto-trans is real bugger to repair...

RH77
__________________
rh77 is offline   Reply With Quote
Old 05-04-2007, 08:18 AM   #8
Supporting Member
 
lovemysan's Avatar
 
Join Date: Jun 2006
Posts: 595
Country: United States
I put a good many miles on a 93 s10. 2.8l 5spd It averaged around 24-26mpg hauling tools and misc stuff. Mostly rural small town driving. Its a tough little motor. My favorite of all s10 powerplants. At 200k with the original timing chain and something ticking in the motor it still got a steady 24mpg driven by my 19yr old brother.
__________________
02 Saturn SL
5 speed
for pics click the link below

http://s75.photobucket.com/albums/i3...emysan/saturn/

[SIGPIC][/SIGPIC]
"for best mileage swap in a d15z1"
lovemysan is offline   Reply With Quote
Old 05-04-2007, 08:30 AM   #9
Registered Member
 
Join Date: Mar 2007
Posts: 1,138
Country: United States
Quote:
Originally Posted by rh77 View Post
Is that the one they put in the Celebrity? If so the Auto-trans is real bugger to repair...

RH77
Probably the same one but thankfully the S-10 would be a rear drive. I think that the iron duke was their main (maybe only) 4 cylinder until the Quad4 replaced it.
__________________
Bill in Houston is offline   Reply With Quote
Old 05-04-2007, 05:07 PM   #10
Junior Member
 
Join Date: May 2009
Posts: 28
Country: United States
I had an '85 GMC S-15 for many years, and with the 2.8L 2bbl engine I averaged just under 20 MPG almost invariably. Lots of city, would be around 18-19, lots of highway, 20-21. Most I ever got out of it was just shy of 24, but this was with an auto trans and 4WD. I'll echo the comment on the engine's reliability - it was pretty bulletproof. Very few issues right up to the 280,000 mile mark when I gave it away.
__________________

Maillemann is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Missing Fuelup jmonty Fuelly Web Support and Community News 3 05-27-2009 05:10 AM
fuel-up entry suggestion fugalaya Fuelly Web Support and Community News 3 04-12-2009 09:29 AM
Pulse and Glide? Pete7874 General Fuel Topics 24 02-26-2009 12:11 PM
Individual Fuel Ups Reporting 0.0 Odometer jlmasonwv Fuelly Web Support and Community News 2 09-17-2008 06:27 AM
MID Install SVOboy Experiments, Modifications and DIY 33 06-04-2007 11:27 AM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 05:40 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.