Well, lets get this out in the open for everyone. Some of us suffer from HORRIBLE gas mileage, and I am sure, that throughout this whole community, we can come up with some ways to improve it. This is not meant to start stupid comments, like, "Dont mod it", or anything like that. If you know about TPI's, tell us, or TBI, any fuel system these cars use.

Alright, whos got something to start this thread off strong???

Tris

 

only three ways to reduce the gas consumption of any motor in any significant amount really.

1. Less CID
2. Less RPMs
3. Lower a/f ratio.

you can gain a few % here and there with other stuff resulting in better effieciency..but not much.

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"American made baby. 100% American iron. The muscle among the masses. My hero. Yep, you can take your ergonomically designed, space age, computer controlled, 4 door, cup holding map lighted split double wishbone split fold down retractable cargo covered moon roof piece of transportation and keep it. For I have felt the thunder. And I know the difference!"
JSP Motorsports
ICON Motorsports

 

Freer flowing exhaust (compared to stock) and intake/plenum/TB. Anything that you can do to get air in and out of your engine easier will increase it's VE. That will in return give you more efficient energy (or power). That doesn't mean more air though. A big cam will increase the amount of air, but will also increase the amount of fuel needed.

A lot of what manufactures do to a car is to make it quiet, and emissions legal. Well that lowers it's VE. I don't understand the EPA. If you increase the mileage/gal., then we would burn less fuel. That in itself would reduce toxins & gas prices due to more supply, and less chemicals they add to the gas to make it "burn cleaner."

I think the biggest thing would be to tune it up on a regular basis, and just check the
plugs, wires, rotor, air filter, and fuel filter more often. That in itself would increase the efficiency of the engine. And then there's air pressure in the tires, wheel bearings, axle bearings, front end alignment, gear ratios, aerodynamics, etc. I had a 94 Z28 6-spd and I noticed that if I let off the brake on a slight grade, the car didn't roll.
Later I read that I could buy a kit to increase clearance on the rotors/pads. (I guess GM made it tight on purpose.) They claimed better gas mileage and better et's.
Makes sense to me. Less friction.

 

what they said above and keep your right foot out of it.


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82 camaro--original steering wheel, brake/gas pedals, seats--everything else modified
82camaro

 

A good ignition system.
Light foot.
Less weight.
More air pressure in the tires.
Proper alignment.
Synthetic diff fluid.

 

Invoke Highway Mode in the eprom and tweak it. I get 30 US MPGS with my L98.

 

Glenn i've seen u post a lot about that...how can i do that? I have an 89 L-98 MAF equipped GTA...any info would be GREAT!!

if u could email flysc50@aol.com

Thanks

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Originating member of the SJNEP Crew
Member of the Jersey Fbody Crew(JFA)
Check out MyGTA Nicknamed:The Big Red Machine
***AOL IM RiceEatinGTA***
Moderator at www.transamgta.com
"What does not kill us only makes us stronger"

Tony

 

Simple. Read Tim (Traxion's) "Prom Burning Introduction" article (there is a link on the top of every page on the DIY PROM Board). Then install the ARAP BIN (if you have a MAF car) and disable the cold start injector if your car is pre-1989 (1989s don't have to do squat). Change the Fan switch to "Normal Operation" and alter the AF ratio in the Highway Mode AF Ratio Table to around 17.2 to 16.4 (at higher load values).

For SD, you get your VE tables as close as possible to 128/128 on the BLM/INT and then enable the minium Highway Mode Speed from its value of 255 to around 40-45. Then adjust the Highway Mode AF Ratio vs MAP from 17.2 to 16.4.

That's it for TPI.

 

Oh...and then you "tweak it" to what your engine wants.

 

He has spoken. I was waiting for Glenn to enlighten you.

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1987 GTA L98 MD8 GH3
355 '97 Vortec 4-bolt block, TRW(suck) forged pistons 10:1 CR, TFS 23*, LT4 Hot Cam, Ported plenum and intake, SLP Siam Runners, Edelbrock TES, gutted Cat, Flowmaster, Home-made cold air system w/ K+N cone and AFPR, TB bypass, AirFoil, !AIR, !A/C, 2300 stall.

"Stop Lights timed for 35Mph are also timed for 140Mph"

 

Glenn...i have a stage 2 aftermarket chip(Fastchip) can i do it to that chip or will i run into complications?

 

You can reprogram it as I said above.

The ARAP BIN is probably the best stock F-body bin for a MAF car. If was developed by GM for their test cars.

About the only change guys sometimes make is reducing the spark advance, it's that aggressive. But we I installed it on a buddy's car and hooked it up to a scan tool, it was almost 128/128 perfect as is.

The only things we had to do was "tweak" the AF ratio for the Highway Mode and alter a couple settings to "personal preferences".

 

Glenn... thanks for makeing me feel stupid!

What about use guys with a carb and no computer? Am I doomed to only get 25mpg because I cannot "tweak" a chip?

2.73 gears, more air in tires, skinny tires (like 205 or something), taller tires, lean out engine a/f ratio, stay off the gas, and increase the engine effeciency is about it.

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1984 z28 w/ a 357 cu in. monster engine which is looking like the posterchild for Edelbrock with the exception of the Holley 750vac... all the suspension stuff... 9-bolt posi disk is in...

-=ICON Motorsports=-

[This message has been edited by Biochem (edited June 01, 2001).]

 

Nope.
Lets see if anyone knows why...

 

hmmmat about $1.80 a gallon for premium (93 octane) and maybe $1.60-$1.65 for regular (87 octane) do you think it's cheaper to cut back the timing and run 87 octane??? or keep my timing where it is and keep using 93 octane????

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85 Z28- 350, Comp 262, Edelbrock Performer intake, Edelbrock 600 cfm carb and Edelbrock cat back, Summit headers and vette servo
-JVC, Eclipse, Pioneer, MTX, Phoenix Gold, Planet Audio

 

I use 87...

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1984 z28 w/ a 357 cu in. monster engine which is looking like the posterchild for Edelbrock with the exception of the Holley 750vac... all the suspension stuff... 9-bolt posi disk is in...

-=ICON Motorsports=-

 

OK you are going to think I am nuts but it works. I have a product on my gas lines, air intake and the cooling system. I have improved gas milage, my engine passed emission test with real low numbers and I have a performance increase. The product can be moved from car to car and will last a life time. Miles per gallon improvements for me was from 15mpg to 18mpg. Check at this site for more information or email me www.magnetizer.com



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83Z28, 350,5speed,TTops,Heddman Shorties, mild cam, K&N air filter.

 

Keep the proper air pressure in your tires. Check the alignment-an out of line front end will really kill mileage. Keep your engine tuned. Get your air conditioner fixed and keep the windows up in warm weather.

If you can drive "normally", most any mod to get more air into the engine and more air out will also help your mileage.

Then, when you want to be "abnormal" you can test your mods to see if the power increased since the last time you punched it!

Larger engine size doesn't necessarily mean lower mileage. My '88 GTA gets better mileage under almost all circumstances than my 2.5 liter, 4 cylinder, 1992 GMC Sonoma (except the track, which I haven't tried with my truck-that would be a sight!).

The truck has to "strain" (compared to the GTA) to get anywhere, whereas the GTA easily runs 60 mph at 2000 rpm.

One last tip---wash and wax your car regularly!!! While this is a half-hearted joke, if you tend to take care of the outward appearance of your vehicle, you tend to take care of the parts most people can't see.
jms

 

Run lower fuel pressure.

 

I now get 40+ MPGs, ofcourse the IROC sits, and I drive a H*%da

 

Gee MadMax kinda pesimistic .
Ok carb guys here the deal. The ccc carb setup is supposed to be the most fuel efficent carb "if everthing else is running good". I posted the question in the carb board to see if any one could tell me thier tricks, no real responses just keep your foot out of it, stuff like that. Im not a big fan of computer controlled stuff "I like to tinker" The ccc can be leaned out to improve fuel economy rods jets ect, and the mixture controll screws can be leaned although the computer compenstaes to the point where its like nothing was done at all. So basicly just make sure that everthing is tunned properly also a open eliment filter can improve ecomony but not by much. A non computer controlled qjet can also be tuned with smaler rods/jets ect. Basicly if you drive in the primaries at steady speeds its possible to get excellent fuel economy and when you open all 4 up it changes from mpg to gpm. To start qjets like fresh rebuilds that can account for a healthy gain in fuel economy. The crapy plastic floats like to disitegrate every 10,000 miles, the air tubes like to fall out stuff like that. So start off with a fresh carb drop an open element filter on and you will notice improved ecomomy. Holly 600cfm carbs can give you excellent fuel economy I personaly got 20/25 mpg on a stock 305 with a 700r4 no lockup, the only modes were the holley, action+ manifold and a old hei distributor. Although I had great economy I wanted a fun car so i popped a very well built 350 in and sold the 305 for 800$ Basicly what im getting at is you need to decide if you want a mustang killing ticket loving beast or a grandma car. If you want bolth you need a Fuel injected car.
SSC
I want it all!

 

Is there anything else I can do to improve gas milage? I might get new exhausts system and a cold air intake system with a Granatelli Motorsports Mass Air Flow Sensor just for that purpose.

 

id say the best way to improve it is to leave it parked, sit in it and make reving noises with your mouth. or u could go fancy and burn a CD with engine noises on it and play it

exhaust, MAF, induction, really its all about makeing more power at a lower RPM with smaller amounts of fuel, running smaller injectors, a 305 over a 350, a lower stall converter, 2.73 rear gears, dropping RPMs

 

un fortunatly I'm not sure if I have a 305 or a 350. It's an 88 GTA with T-Tops and from what I read in the searches, if it had a T-Top 95% of the time it's a 305 V8

 

Check your VIN, that'll tell ya really quick. the eighth digit to be exact.

 

Wow!

This one has really been dug up from the grave! Cool!

My two cents; I run a 3.42-ish gear set. Everything else said above is good to go. It's like the guy above said about the S-10 4 cylinder versus the V8. With the V8 the car doesn't work so hard...

 

Holy old thread, Batman! Where did you find this thing????

Step #1 - A fresh tune-up, including filters.

 

3.42 is steep, 2.73s would give him way better cruizing speeds, couple that with a 305 700r4 they got a really low RPM at 60mph, like 1500-1700rpms, i got an 86 TA 305 tpi with 2.73 auto trans and that thing cruzes at 1500 at 60mph.

 

Unlike most n00bs, I believe in the search tab.

 

hmmm, thats exactly what i was going to post...