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Tech / General Engine Is your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!

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Old 11-14-2002, 06:37 PM   #1
Senior Member
 
Join Date: Oct 2002
Location: Deerfield, Il. Near chicago( Purdue University for school)
Posts: 265
Car: 1991 Camaro Z-28
Engine: 5.7L TPI
Transmission: 700R4
Axle/Gears: 3.23

Classifieds Rating: (0)
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10 mpg ?! What can i do for more gas milage (Updated)

I recently calculated my gas milage on my 1991 camaro z-28, it gets 10 miles to the gallon. I am still going to school and i dont have the money to keep up a 25 dollar tank of gas twice a month. What can i do or buy for my car to increas my gas milage and some more power would be nice? Thanks for any help.

Ps- are we supposed to get our messages off the message board after a wile or can we just leave them?

For all of you that want to know what exact set up i have i am not totaly sure i do know that i have a 1991 camaro z-28 with the automatic transmition and a filly stock 350 TPI engine. Also someone wanted to know the tire size, what it says on my tire is,
Eagle GT II P245/50R16 (96 T)
any thing else i should post and tell me i will find it out for you i really wont to fix this problem!

I am new to this so geve me a brake for all i now all parts are stock or at least replacements of stock parts. Thanks Again!

Last edited by raptere; 11-15-2002 at 07:17 PM.
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Old 11-14-2002, 10:00 PM   #2
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Join Date: Dec 2001
Location: Blacksburg, VA
Posts: 731
Car: '92 Rally Sport
Engine: LO3
Transmission: 700R4

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THe first things we have to know about here is:

A: Displacement
B: Tranny
C: Rear Gear Ratio (tire size is also helpful)
D: method of fuel metering and induction (aka. TBI, TPI, CARB)
E: Power adders or other mods?
F: Do you have a lead foot? ...Or perhaps a pet elephant that you squeeze in there too like 50 midget clowns in a WV Beetle?
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Old 11-14-2002, 10:00 PM   #3
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Join Date: Dec 2000
Location: California
Posts: 3,811

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Leave them.

If you're only getting 10mpg there is something wrong with your car, and you should find out what that is. Could be a bad coolant temp sensor, bad oxygen sensor, worn engine, or other things. It's likely a combination of many things. Checking for trouble codes could help pinpoint a problem, check the FAQ at the main site to learn how to do that.

If you don't have money for gas, I wouldn't even consider trying to get more power.
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Old 11-14-2002, 10:22 PM   #4
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Join Date: Sep 2001
Location: Ontario, Canada
Posts: 5,823
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction

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Duct tape an egg to the gas pedal.
If it breaks, get another and don't push so hard.

Garanteeed worth 5 mpg.
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Old 11-14-2002, 10:50 PM   #5
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Join Date: May 2002
Location: SE Pennsylvania
Posts: 432
Car: 1986 Trans Am
Engine: 350 W/Plenty of Mods
Transmission: T5

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Hey, well as you can read in my sig, i've got a 350 crate with a 350 trans, and even when I had my 700 trans I still only got about 12 mpg or so. Now with the th350 i'm getting around 8-10.... the main thing I do to compensate for this factor being that I am a pizza delivery guy (don't fret, I make good money... remember to tip good guys) I generally unhook the mechanical secondaries at my carb... it helps a lot, I don't konw exactly how much it helps, but it does, and I actually don't loose that much power at WOT. Even with my old 305 and 700 my mileage was only around i believe 12-15 or so.. and I have two other friends with basically the same setup as myself except 3.73's and T5 and they get about 8-10 as well.
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Old 11-15-2002, 12:06 AM   #6
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Join Date: Jan 2002
Location: Red Deer, Canada
Posts: 812
Car: 89 Shortbox
Engine: 350 Vortec
Transmission: 700r4

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Not sure what your running for fuel induction, but if your efi the mileage is all in your chip.

Ie: My normal "tunned" chip gets 12 mpg
My "hiway chip" gets 22 mpg

Better milage from leaning out to 17 to 1 afr and advancing timing.
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1989 1500 Truck SB, 350 ci, 750 cfm Performer (RIP ported 454 tbi), Comp 222/226 @ .050 with .500 lift 114 deg LSA, 10.7 to 1 CR, Ported Vortecs, Flow Tech Headers, Edelbrock Air-Gap RPM Intake, 1.6 rollers, Custom UVEPROM, Walbro 255 pump, MSD Ignition, Dual 3" Dynomax, 3.73 posi, 700r4, Stage 2 Shift Kit, Vette Servo, cheap 3000 stall.

Shooting for high 13's (mid 13's corrected)

2001 Dodge Cummins 3/4 SLT Leather,Loaded, 39" mudders, 525hp & 1200 ft/lbs.

2001 ZR2 Blazer Loaded, K& N and chip. 31" mudders.

1989 Shortbox
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Old 11-15-2002, 12:52 AM   #7
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Join Date: Dec 2001
Location: Blacksburg, VA
Posts: 731
Car: '92 Rally Sport
Engine: LO3
Transmission: 700R4

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With what I've got (sig) and my 700R4 I get about 18 around town and last time I calculated my HW mileage (most at 70 mph and 2100 RPMs) it was 29.5 mpg. Pretty good considerding the new civic si only gets 24 town and 30 hw and has less than half the displacement! hehe POS cars Makes you wonder how much wear and tear it puts on those little engines to turn 3500 RPMs at 70 mph
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'92 Camaro RS, LO3, 700R4 w/ 126K miles, Ultimate TBI mods, 14x3 open element, MSD Blaster coil, Accell Superstock 8.0mm wires, Accell cap and rotor, Delco plugs @ .040 gap, Jet Hot coated Hooker 2055 headers, and Hooker cat-back, Northern Radiator, B&M Trans cooler.
**In the works: PROM tuning, LCAs, air springs, cowl hood, and paint.**
FOR SALE: 3.23 gears - "take offs" from a 4th gen with less than 5K on them. PM me.
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Old 11-15-2002, 12:52 AM
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