What are best low$ 8.1 perf/gas mile adds?

hellostop · August 29, 2004

I'm wondering about relatively inexpensive: headers, low back pressure mufflers, 3.73's Vs 4.10's, induction pieces, rocker arms ?

for 8.1 2003 4/4 ext cab allison

Is there a consensus on where this truck needs the most help? ie best bang for $ ??

dannyukonxl · August 29, 2004

well basically i try to keep the 8.1 in the garage but do a search on yahoo or this sight and you will find an abundance of information, and dont believe the supercharger guys, you can pick up mpg with intake and exhaust mods and a pcm redo

8100HD · August 29, 2004

The absolute best starting point would be a new tune, whether it be a Nelson's, Wester's, or a handheld programmer....you will notice the most from one....and that comes from a "supercharged" guy!!!

tmf6902 · August 29, 2004

I agree....get a tune specifically made for gas milage. I have gotten my best milage when I drive no faster than 65....or downhill

hellostop · August 30, 2004

Thanks, I'll check out a tune.

What is the difference in driveability of 3.73 Vs 4.10's. I have both sets of axles, but not driven either yet. Waiting for new frame, front end.

AS for blowers, I keep my 94z28 ATI DISC w/ twin i/c's 419rwhp, alcohol coming shoud see 500.

N900WM · August 31, 2004

I have driven a number of 3.73 equipped trucks and own a 4.10 equipped truck. The 3.73's are definatly lazier than the 4.10's.

The 4.10 rear end will offer much better throttle response, ease in towing, a bit better acceleration, and a much nicer burn out (should you find it acceptable).

Theoretically, the 3.73's will get you a bit better milage. Though i have not seen a big spread comparing my milage numbers to the numbers other members have posted here with 3.73's.

I have no drivability issues at all.

My best mod was Wester's Tune. No question.

tbyrne · September 1, 2004

A Westers tune along with a highflow induction and exhaust mods will provide you with increased performance and also show you better mileage by making the motor more efficent.

I've been told that the new aluminum heads for this motor will show a mileage increase also but that is a bigger bolt-on mod I'll report my results after they go on.

Tom