Tachometer installed

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Dec 20, 2014 | 12:26 AM

#11

stev

Record Breaker

Joined: Dec 2005

Posts: 1,412

Likes: 2

From: Nashville

Quote:

Originally Posted by blackvan

5200lbs unloaded weight. 235/75/15 Michelin LTX MS2, same gear ratio, 5.2L (slightly modified), 46re transmission. 1500rpm at 55mph, 1680 - 1750(steep hills) at 72mph. No wonder I am getting better gas milage than average even here in these Kentucky hills: 17.7mpg average. 18.8mpg last run to Marion county.

Its more important to match the tire diameter to the max efficiency point in the engine's torque curve. This number will be based primarily on cam profile vs final drive ratio vs vehicle weight. There is no perfect size tire or differential gear ratio: it all depends.

Oh to be on the lighter frame like your vs. the 1-ton B2500 HD or the extended B3500 8-lug wheels. The best I've done was 19.7mpg using LT225/75R16 Load-E at 80psi. Of course there are other mods like synthetic 75w90 in the rear. 46re with 3.92 as well. The van does about 18hwy now.

Glad to hear your van doing well with the mpg. I only know of one van doing 22mpg hwy like your setup.

Dec 20, 2014 | 01:28 AM

#12

blackvan

All Star

Joined: Mar 2012

Posts: 933

Likes: 1

From: South Kentucky

Quote:

Originally Posted by stev

Yes, I went with the ScangageII that just plugs into the OBDII port.

Nice!

I'm just running a cheap ELM27 bluetooth adapter and using the Torque app on my Galaxy 4. What is cool is that I can setup multiple screens, change dial sizes, use round needle gauges, square "half needle" gauges (my preference) or plain digital. Gauge size and position is fully customizable.

My only regret is not buying one sooner.

http://amzn.com/B005NLQAHS

Too cold outside right now for me to go out and take some actual pics for you guys but these youtube videos explain how to set it up and give you a general overview.