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Old 10-28-2012, 08:30 PM   #11 (permalink)
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Quote:
Originally Posted by steve05ram360 View Post
whats ABA testing?
The A test is the control. Data is gathered before the mod is added to the vehicle.

The B test gathers the data collected after a modification has been performed.

The last A test undoes the modifications and brings the vehicle back to the same condition it was in when doing the control test. This should confirm the original A test data. If it does not, then some condition has changed which should cause the B test to be questioned.

An example of why the second A test could be significantly skewed is changing wind conditions. If the wind changed during testing, then the B data is invalid.

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Old 10-28-2012, 10:38 PM   #12 (permalink)
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yeah that makes sense...
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Old 10-29-2012, 02:16 AM   #13 (permalink)
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Grille block, electric fans, and driving slow were worth the most for me.

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Old 01-03-2013, 01:59 PM   #14 (permalink)
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Update... did the grille block, 2nd air dam, tonneau & tailgate spoiler and got a consistent 20.2 mpg on my test run. Then went to the Smarty UDC for engine control and got that up to 22.2 on that same run and it is repeatable. I expect that with a 22 mpg on tap doing 65 I should be easily able to get the 20 mpg on the hiway I was shooting for.

Truck still has the 3" lift, 34" tires and a 180* t-stat. I may test further with a hotter t-stat once I get a new radiator (mines leaking)

Thanks to everyone for their input! (greatly appreciated)
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Old 01-03-2013, 08:18 PM   #15 (permalink)
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Quote:
Originally Posted by steve05ram360 View Post
whats ABA testing?
Good how-to here: How to properly test modifications (AKA: don't believe every MPG claim you read)

I always thought turbos like large exhausts...

You might want to look at my garage picks for some aero ideas. Check Big Dave's truck also.
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Old 01-03-2013, 09:34 PM   #16 (permalink)
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just read the link you provided, I pretty much did just that. Always the same time of day, out & back on the interstate at a part of the day where traffic would be dropping off, let cruise control handle the throttle over the route as much as possible (95% of the way if not more). Didnt do ABA testing because of the costs involved (unemployed ATM) but I did find that during the testing I was able to get repeatable runs. I picked days that were similar in temps and forecasts and avoided windy rainy days. I also logged each run for various parameters in case I wanted to pick thru the data (using LabView to analyze/pick it apart).

I wish there was a way to give a good measure of the city mpg so I could check out the rest of the tune I modified. Would be sweet to get into the 17's in the city but I wont hold my breath.
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Old 01-04-2013, 01:27 AM   #17 (permalink)
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Turbo diesels love wide open exhausts.

Unlike a N/A gas engine a turbodiesel is trying to put its full displacement or more out the exhaust every 2 crank rotations.

You don't really want a 180'F thermostat in a diesel.
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Old 01-04-2013, 09:05 AM   #18 (permalink)
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Quote:
Originally Posted by oil pan 4 View Post
Turbo diesels love wide open exhausts.

Unlike a N/A gas engine a turbodiesel is trying to put its full displacement or more out the exhaust every 2 crank rotations.

You don't really want a 180'F thermostat in a diesel.
Wide open exhausts are best for competition use in my experience, no restrictions equal great top end power and lower mpg. I have had both an unrestricted intake & exhaust and just the exhaust and both times fe sucked. I have found that anything that reduces part throttle low end torque will reduce mpg...

Since blocking the grille i have seen coolant temps rise approx 5-8*f overall, i tried to get a definite answer thru searching the web & forums to find out if a hotter stat was worth swapping in and could not find anything. Any personal experience with it on a diesel? I have a leaky radiator that i will need to swap out with an all aluminum one soon and plan on fitting the truck with a couple of taurus fans so i can ditch the oem fan. I could probably go experiment with the hotter tstats before i do and get my own answer before i get it done...
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Old 01-04-2013, 03:39 PM   #19 (permalink)
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http://www.dieselsite.com/dieselsite203thermostat.aspx

Here is some info on the themostat. This is for Ford but it gives you an idea of the temp range diesel trucks prefer.
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Old 01-04-2013, 03:59 PM   #20 (permalink)
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Thanks I saw & read that. Researched part numbers and found a 200* stant that should be a drop in. I may go try it sooner rather than later.

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