Sitting Bull

Since I got my 86 Camaro back a week ago, after having the 700r4 rebuilt and a TransGo shift kit installed, my mpg has skyrocketed!

Before the rebuild I was getting 15.5 mpg around town.

Now I am getting 19.5 mpg around town!!!

All I can say is WOW :hail: :hail: :hail:

My mods are in my sig but this seems to defy logic or rationale. When the LG4 305 was completely stock it got between 17 and 18 mpg in town. Now that I have at least DOUBLED my hp I am getting even better mileage!

Has anyone else found this to be the case with their modified 305s? What kind of mileage around town are you guys and gals getting?

V8Astro Captain

iTrader: (1)

I guess I have no base-line comparison, because I never had a stock 305.

With the 4.3 V6 I used to get 19 mpg hiway. With the stock L05 350 I got 20 mpg hiway, 22 mpg after PROM tuning. With the beast 350 I got 14 mpg....ick. With my new 305 I'm getting 23-24 mpg and it's still breaking in

These are all hiway/city driving conditions...except for the V6. That was measured on the way from St.Louis to Kansas City.

Jstcrzyengh

iTrader: (2)

Thats d*mn good. Gives me hope for my l69

Vader

Was your converter toasted? Clutch packs FUBARed?

azvolfan

I think it could make sense. If you take into accout the ingnition upgrades are meant to make a better more powerful spark and the rebuild and upgrade on the tranny makes more efficient use of the power output from the engine. I think you could pick up a few mpg's over stock.

Vader

Power loss or slippage can also equal higher ETs. You may have to try the "Path" again and add a chapter...

And lo, their might was unleashed upon them of the east, and without mercy, they were caused to suffer upon the Dual Paths of Darkness, and from the very beginning to a measure of cubits no less than 660...

The Book of Todd, 1:12

Sitting Bull

Well, it WAS the converter that fell apart. The hub broke off finally and and that was that.

But the car had been getting 15.5 mpg for ages before the tranny packed it in. So I don't get it. 19.5 mpg is a lot around town for a 300 hp 305, ain't it?

Sitting Bull

I forget verses 2 through 11 What were they again?

Vader

Most of them that I have cannot be posted, in the interests of decorum and political correctness.

If your TC was replaced, do you have any idea what it was replaced with? Stall RPM? A lower stall speed can deliver more MPG, too.

Sitting Bull

It was replaced with a supposedly stock tc. This tc will hold overdrive right down to 1000 rpm, though. It is really quite amazing.

Perhaps the old tc wasn't locking up anymore, I don't know.

But don't you think 19.5 mpg around town for a well built 305 is kind of spooky?

Vader

I'd take it. "Well built" can also mean efficient. If you're extracting all the power you can from every fuel charge, you're going to get better fuel mileage, provided you can resist the temptation and keep your foot on your side of the floor board.

It isn't much different than the older Rochester Quadrajet getting much better mileage than the 2GC/2GV models, since the primaries were much smaller, triple venturied, and metered fuel at part throttle so much better than the larger 2-barrel. "Power" and "efficiency" aren't mutually exclusive terms. My '96 LT1 Impala (all 4,400 pounds of it) can run at 145 from the factory or get an EPA-rated 27 MPG at 55 MPH. Many smaller cars with weenie little V-6s can't even claim that seven years later.