Hi there

[bobc455]

Just to introduce myself.

I have a 1969 Buick that I am trying to push the envelope on both HP and MPG. It's a very fun car, but getting MPG on a big 455 motor isn't easy!

So far I've converted to computerized FI, I have a 2.56 rearend, and a few other tricks. Right now, my next step will be getting a custom camshaft ground to be a good compromise between HP and MPG- my current cam probably has too much intake duration for an efficient burn.

In the past I've gotten over 19 MPG (hwy), and the car runs 11's in the 1/4 mile. Not bad for 4300# car. I consistently to break 20 MPG and hit the 10's, which I think is achievable with a bit more work.

Anyhow, I look forward to learning/talking about MPG.

-Bob Cunningham

[SVOboy]

Hey there, good luck with your build!

Do you drive anything that gets decent mileage for those times you want to be above the teens?

[diamondlarry]

Wewlcome bobc455! HP and FE don't have to be in two completely different cars. Those numbers are respectable for a car that heavy and a motor that big. I'm sure you'll find something here that can help you increase those numbers.

[JanGeo]

I wonder if you can run two completely separate fuel injection systems - one setup for lean burn with smaller more better vaporizing injectors and another setup for power.

[GasSavers_Red]

Hows it going Bob? With your FI system wonder if it would be easier to implement some kind of MSD system

[omgwtfbyobbq]

Depending on what kind of FI you're running, it might be easiest to have something like MS that can switch between fuel maps on the fly. You can run around town lean, and switch to a richer map at the drags, provided you don't do this already.

[onegammyleg]

Originally Posted by bobc455

a 2.56 rearend,
and the car runs 11's in the 1/4 mile.
Not bad for 4300# car.

11,s with a 2.56 ?

[red91sit]

and... he's gone

Maybe he was talking about the 1/8 mile?

I was really hoping I had another land yacht driver on this site, but oh well.

[red91sit]

You must also have a roll cage, new SFI approved pressure plate, flywheel scatter sheild, driveshaft loop, and a multi-point race harness.

Not exactly something I'd want to drive on the streets, considering the roll cage and highly stressed powerplant.

[onegammyleg]

Originally Posted by red91sit

You must also have a roll cage, new SFI approved pressure plate, flywheel scatter sheild, driveshaft loop, and a multi-point race harness.

Bobs cool ride



¨Description : 1969 Buick Special 4-door w/ 455 (7.6 ltr). 4300#, 15 MPG highway. Quiet, and docile enough that my wife and mother will drive it too. Automatic transmission, quiet mufflers, and plenty of other daily-driver necessities.¨

http://www.forum.nitrous-advice.com/...ry&image_id=30