Mods and Tuning for Best Fuel Economy ??
 

How does one TUNE a 12V for the BEST fuel economy ??

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Surely someone knows how to tune for economy on a 12V.... :rolleyes:

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Timing, intake, exhaust. That's all I know. I'd say set the timing around 16-17*, get a scotty 2 intake, and a 4" exhaust.

From looking at your signature, timming is the onlt real improvement that you will see. Some 215 injectors with thin washers help some people as well.

[QUOTE=BigBlue] I'd say set the timing around 16-17*, QUOTE]Roger that.

Does advance the engine timing have the same effect as bumping the ignition timing on a Gasser (by moving the torque up the power band. ) ??

timing
 

Yes katmandu that would be correct on a 12v you will sacrifice a little low end torque with advanced timing but you will like the overall performance better and it will help on mileage. :)

[QUOTE=Katmandu]
With all the torque these motors put out you will hardly notice the low end loss. I could tell when I did mine, but just barely.


Travis

How far is TOO FAR for a truck with the mods my truck has (See Sig) ??

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16.5-17* is probably best for most people with 215 pumps!

I'll probably be setting mine around that if I ever get the thing on the truck;)
Chris

You may want a better intake such as BHAF, or afe filter set-up. Timing will help. Higher tire pressure (dont wear out the middle of your tires though), tail gate UP, speeds around 55-60mph yeild good mpg, dont use engine to slow down-coast, tune afc for minimal smoke, stay out of the fuel pedal! Powerservice in the white bottle helps as well. No long warm-ups or idle times. If you want to go as extreme as full synthetics, they are claimed to help.

I just went through a thread that said the BHAF will lower power. I will try to find it........

Here it is https://www.dieseltruckresource.com/...ad.php?t=91016 read the whole thing.

scotty II helped my mileage, also the #10 palte on a 215 pump without gov springs and slid about 2/3's forward with gov arm adjusted and afc tightened down so that she jsut barely puffed. 16* timing and 285/75 16 tires with 3.54s yeilded 18-20 on long trips including fuel stops the average speed over 14 hours of drigning was 64mph 4"pipe with muffler which means i was running 70+mph regularly.. through nevada up and over the passes

I now have no scotty just an AFE, Lenny stage 4 injectors, twins, 16* timing the #10 plate slid back to about 1/2 maybe a hair under, afc tightened up, can push 50 psi no problem at WOT, a drilled Wastegate on the top turbo same tires and gears. 4" pipe with muffler average 17-19 get 17.4 mpg at 70-75mph get 19.2mpg at 65mph and i know i could do better if i wasnt so temped to romp on it occassionally.

No timing so stock 14.5*, the 215 pump with a #10 in stock location, afc tightened and stock turbo with a K&N filter int he box and straight exhaust
18mpg on the highway at 65mph 16mpg at 70-75 mph

my driving style hasnt changed 1 iota



All in a 98 12v 215hp 6spd equipt QC SB 4x4 with 160k miles You decide