Bone stock LT1 in 1995

Get's 17/25 mpg

What all can be done to the bone stock engine to increase it's gas mileage.

 

a free flowing exauhst will increase gas mileage a little, if you can keep your foot out of it!

 

exhaust, cai, retune.

perhaps running different tires that reccomend a higher pressure, check the o2 sensors, and a new fuel filter. New plugs, wires, and a coil. EGR valve perhaps as well. Those are some big culprits.

 

I was thinking

Long Tube Headers
High Flow Cats
better flowing muffler
ported intake
slightly bigger throttle body

Will all of those mods help increase gas mileage?
Or will some of them make no effect at all?

 

So, the ONLY reason for getting LT's is gas milage, riiiiiiight. And I'm buying an evo cause its a 4door.

 

My AS&M headers and Borla cost me about 2mpg. Funny thing was it also caused increased wear on the rear tires.

 

When I first got my car I got 300 mile per tank interstate.Then I put a cat back on it and cai and a 4.11 It when to 250 miles per tank. I put TEA heads on it went To 325 per tank. I could not belive it. That it was geting beeter gas milage than stock. Mabe because the heads were more efficiant.

 

Now this may sound real stupid, but all the things that will improve your gas milage, with also make you want to put your right foot further to the floorboards. Which in turns make your fuel economy plummit ...But yes a set of headers, aftercat exhaust, air intake will all increase you fuel economy,

 

I don't see how exhaust or intake mod's would help gas mileage. At cruise, the air flow through the engine is very low since maintaining speed may require as little as 20 hp, so the exhaust and intake tract are plenty big enough.

Increasing gas milage comes from reducing drag and parasitic losses.

Things that make sense:

- Underdrive pullies: reduce drag on the engine. *biggest gain*
- Hotter thermostat: less heat lost to coolant, so more efficiency.
- More tire pressure: less rolling resistance.
- Synthetic fluids: less drag on moving parts.
- More compression: lower BSFC, even at part throttle.

Mike

 

By the way. . .

I've done alot of gas milage logging on my '00 Lightning and found that, to see REAL differences, you have to run at least 3 tanks of gas through it in each test condition.

The milage will vary +/- 2 mpg in the same conditions from one tank to the next.

Another factor is the psychological one. A person buys a Jacobs ignition for his '84 Blazer because they gaurantee .5 second improvement in the quarter mile and +2 mpg. So he goes to the track and it runs the same, so he reduces tire pressure, ices the intake, and heats up the tires more and launches harder to "get the gains that Jacobs promised and give the new ignition a fair chance". Low and behold, it runs better. Now, he wants to test gas milage, so he drives it gingerly and slowly to, again, "give it a fair chance to make improvements". Once again, the ignition comes through with 2 more mpg, when the ignition did nothing.

Mike

 

reducing the weight of the car should help.

 

Well I should have went further into detail of what i'm trying to accomplish.
I looking into buying a 1995 Caprice Wagon for it's space and towing ability for my Courier business.
It has an LT1 in it.
I have a 91 Camaro and a 97 SS with lots of work done to them for racing. So i have no interest in turing this station wagon into a drag car.

I picked up three contracts with three airlines to deliver their lost luggage to their customers. Paying $1.10 a mile. Most truck owners only get .80 cents a mile and those huge trucks burn a lot more gas then a car does.
So YES if long tubes along with a combination of other things can raise the miles per gallon from 16 to 21 or even more then i'll look into getting some installed.
The main goal is to bring operating costs per vehicle as low as possible.

 

Nothing is going to drastically change your MPG.

Just keep in mind how long it would take(miles driven) to make up the cost of any bolt-ons. $500-1000 is a lot of money to make up from the small amount of gas milage that you will gain.

Dan

 

I heard descreaning the MAF helps some because it leans the car out a little more because LT1's come a little rich from the factory.

On my last f-body an 86 Camaro with a 2.8 I went from 18mpg to 28 (I kid you not).

I took out the junk stock ignition and put in platnum plugs, accel wires, accel super coil, replaced the FACTORY fuel filter, synthetic oil, pulled the A/C that had not worked in like 10 years, pulled the steel wheels off and put on Z-28 aluminum wheels that I got for $100.

Right now I get 20mpg City in the Camaro, almost 300 a tank, open airbox, 15W-50 Mobil one, and a 160 t-stat. I know a guy with a 97 T/A 6 speed fully loaded, borla cat back and K&N CAI and he gets worse than me but he gets on it more.

My plans are SLP CAI, flomaster cat back with headers, re-tune, maybe an A/C delete, and pullies, platnum plugs, taylor wires, along with crane 1.6 roller rockers, T/B coolant mod, and shave some weight. I will loose some MPG but gain some at the same time depending on if its the weekend or not LOL.

 

Gears for sure
Install some 2.73 or lower gears and you will make your engine run some rev less in a min at 60 mph. And somes real hard and skinny tires wit 35+ Psi.
Change the air filter Or clean it every engine oil change.
Lower 2" it help in Hw.