DPF Delete results and input?? - Page 10 - Chevy and GMC Duramax Diesel Forum
2011+ LML Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 11-18-2012, 08:27 PM   eBay Motors  #91 (permalink)
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Originally Posted by Chevytuff19 View Post
I figured out the amount of miles it would take me to recoup the cost of a DPF delete kit a while back. I can't remember exactly, but it was a little over 200K miles based on $4 diesel and a 3mpg gain. It's not exactly the most cost effective mod...it is mainly just to get more power, sound, and to get rid of regens.
I don't think your math is correct. Assuming a modest 15 percent increase in mileage and driving 12k mi per year that is about 100 gallons of diesel fuel per year or $400. Based on that I figure ~2.5 year to recoup the $1,000 cost.
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Old 11-19-2012, 05:54 AM   eBay Motors  #92 (permalink)
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I am not trying to be critical but in my very humble opinion it would be very difficult to use any additional power from the lml without risking damage to the engine or drive train and almost impossible to keep your foot light enough to see any mileage improvement.

Getting rid of the regens would be nice though.
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Old 11-19-2012, 07:45 AM   eBay Motors  #93 (permalink)
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Originally Posted by Sandman_73 View Post
I don't think your math is correct. Assuming a modest 15 percent increase in mileage and driving 12k mi per year that is about 100 gallons of diesel fuel per year or $400. Based on that I figure ~2.5 year to recoup the $1,000 cost.
You are right...I didn't remember exactly and was way off with what I thought I remembered...guess I should've redone my math before posting.

Here is how I calculated it...I didn't take into account price of DEF or diesel used during regen.

*Assuming a 3 mpg gain*

Before Delete:
$4 per gallon/14 mpg = ~$0.28 per mile driven

After Delete:
$4 per gallon/17 mpg = ~$0.23 per mile driven

This gives me a savings of ~$0.05 per mile driven.

$0.05 * x = $2000 (which is what the shops around here charge for parts and labor)

x = $2000 / $0.05
x = 40,000 miles to recoup the $2000 investment
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Old 11-20-2012, 05:50 PM   eBay Motors  #94 (permalink)
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I am going to install the Banks intake (I was dead set on S&B for price point but Banks was only $40 more )and run some fuel comparisons then I will run the H&S with DPF Delete on Wild. I am very anal about these numbers so I will make sure I'm using the same tank of gas, temperature, winds and air density. Otherwise the comparison is all for nothing. Should be a couple days before they arrive in the mail.
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Old 11-20-2012, 05:59 PM   eBay Motors  #95 (permalink)
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Originally Posted by bss View Post
I am going to install the Banks intake (I was dead set on S&B for price point but Banks was only $40 more )and run some fuel comparisons then I will run the H&S with DPF Delete on Wild. I am very anal about these numbers so I will make sure I'm using the same tank of gas, temperature, winds and air density. Otherwise the comparison is all for nothing. Should be a couple days before they arrive in the mail.
Cool keep us posted. I have always doubted some of the reported intake mileage claims.
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Old 11-21-2012, 10:44 PM   eBay Motors  #96 (permalink)
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I got my Banks CAI in today. Meyers Performance was great. I think I ordered it and it was here the next day. Im going to make a short story long.... Like I said I was going to run some Fuel numbers and this is what I found... I want my money back for the intake. Let me explain.
I ran numerous runs on the same route, with the same route, same speed, same temp, same winds, and same gas tank. I used the DIC to compare differences. I realize It is not accurate but It does tell me if one run is better than another.

35.4 inch tires with uncorrected speedometer. I believe it is 8.9 % off. So these mpg are all uncorrected for tire size.

1st run, I accelerated to 70 then set the cruise control. STOCK results 17.9 mpg
2nd run opposite direction 75 mph, NO cruise control. 15.8 mpg

(I have never gotten numbers this good. I believed it was the diesel fuel I just filled up on today.) I later discard these numbers

Now I went and installed the Banks CAI intake
Results with same conditions except 4 degrees cooler which should result in better performance.
Run 1 W/ Banks at 70 mph cruise control on was 15.8 mpg.... This was worse than my first stock run.
My return route w/ Banks at 75 and no cruise control was 14.9 mpg.... also worse.

Well I was frustrated, so i took the Banks out and re installed the stock intake.
I run multiple runs stock. To save you the confusion I will just post all my numbers.

Stock, first run, I completely discarded but it was 17.9 mpg at 70 and 15.8 mpg at 75.

Banks CAI 70 mph Cruise Control on - 16.9 (second run) (1st run I hit traffic and had to abort)
Banks CAI 75 mph w/ no cruise control - 14.9 (second run)

STOCK 70 mph Cruise Control on - 15.8 (1st run) and 17.3 mpg (second run)
STOCK 75 mph w/ no cruise control 14.8 (1st run) and 14.9 mpg (second run)

Here is my conclusion. I did two runs out and back on each test, Stock and Banks CAI. My second run was slightly better each time. Could be one of two reasons 1) Transmission warmed up or 2) tires warmed up and pressure increased 4 psi.
Regardless, if we compare second runs the stock was 17.3 vs Banks 16.9 at 70 mph and 14.9 with stock compared to 14.9 with Banks at 75 mph. Basically the same!!!

One thing I noticed was the engineers a GM utilized the "ram air" coming up through the fender wheel well better. It looked like, in my opinion, the channeling of air in the stock system was providing more positive air pressure than the Banks. The Banks filter was superior but the air seemed like it would be more disturbed and did not line up with the holes in the wheel well at all. My stock filter has 39000 miles on it.
Not sure what Im going to do at this point but if someone out there makes a higher flowing filter for the stock set up I will probably got that route. Assuming I can return the Banks CAI.
By the way, I think I replaced the system in under 25 minutes the second time. Very easy to install.

UPDATE after I wrote this I was informed the ECM does the fuel calculations on the DIC as opposed to a fuel flow rate attached directly to the fuel line. With that said I have no idea what the DIC is calculation and further calculations will be hand calculated
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MBRP 5' complete exhaust,

Last edited by bss; 11-23-2012 at 10:25 AM. Reason: Research show is was incorrect
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Old 11-21-2012, 10:46 PM   eBay Motors  #97 (permalink)
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Just to clarify this was all stock. I am installing the XT Pro and DPF Delete w/ 5" exhaust this weekend.
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MBRP 5' complete exhaust,
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Old 11-22-2012, 04:20 AM   eBay Motors  #98 (permalink)
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Quote:
Originally Posted by bss View Post
I got my Banks CAI in today. Meyers Performance was great. I think I ordered it and it was here the next day. Im going to make a short story long.... Like I said I was going to run some Fuel numbers and this is what I found... I want my money back for the intake. Let me explain.
I ran numerous runs on the same route, with the same route, same speed, same temp, same winds, and same gas tank. I used the DIC to compare differences. I realize It is not accurate but It does tell me if one run is better than another.

35.4 inch tires with uncorrected speedometer. I believe it is 8.9 % off. So these mpg are all uncorrected for tire size.

1st run, I accelerated to 70 then set the cruise control. STOCK results 17.9 mpg
2nd run opposite direction 75 mph, NO cruise control. 15.8 mpg

(I have never gotten numbers this good. I believed it was the diesel fuel I just filled up on today.) I later discard these numbers

Now I went and installed the Banks CAI intake
Results with same conditions except 4 degrees cooler which should result in better performance.
Run 1 W/ Banks at 70 mph cruise control on was 15.8 mpg.... This was worse than my first stock run.
My return route w/ Banks at 75 and no cruise control was 14.9 mpg.... also worse.

Well I was frustrated, so i took the Banks out and re installed the stock intake.
I run multiple runs stock. To save you the confusion I will just post all my numbers.

Stock, first run, I completely discarded but it was 17.9 mpg at 70 and 15.8 mpg at 75.

Banks CAI 70 mph Cruise Control on - 16.9 (second run) (1st run I hit traffic and had to abort)
Banks CAI 75 mph w/ no cruise control - 14.9 (second run)

STOCK 70 mph Cruise Control on - 15.8 (1st run) and 17.3 mpg (second run)
STOCK 75 mph w/ no cruise control 14.8 (1st run) and 14.9 mpg (second run)

Here is my conclusion. I did two runs out and back on each test, Stock and Banks CAI. My second run was slightly better each time. Could be one of two reasons 1) Transmission warmed up or 2) tires warmed up and pressure increased 4 psi.
Regardless, if we compare second runs the stock was 17.3 vs Banks 16.9 at 70 mph and 14.9 with stock compared to 14.9 with Banks at 75 mph. Basically the same!!!

One thing I noticed was the engineers a GM utilized the "ram air" coming up through the fender wheel well better. It looked like, in my opinion, the channeling of air in the stock system was providing more positive air pressure than the Banks. The Banks filter was superior but the air seemed like it would be more disturbed and did not line up with the holes in the wheel well at all. My stock filter has 39000 miles on it.
Not sure what Im going to do at this point but if someone out there makes a higher flowing filter for the stock set up I will probably got that route. Assuming I can return the Banks CAI.
By the way, I think I replaced the system in under 25 minutes the second time. Very easy to install.
Your system is flawed.. Your truck does not give you instant economy. It does it over the life of the tank. If you reset it and take your foot off the gas it will give you some crazy number. Unless your test road was about 100 miles long, your results are not accurate.
That being said, an air intake will not yield you much economy. The stock set up is pretty darned efficient. Most of us guys with the new style air box change it because we have this darn addiction to changing crap.( my wife says I cannot leave anything alone)
Once you do your deletes and program it your Dic will be useless. They get way off once programmed
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Old 11-22-2012, 05:56 AM   eBay Motors  #99 (permalink)
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I reset the DIC before every run that I did, therefore the AVG MPG is correc, IMO. I have no reference to back this up.
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Old 11-22-2012, 06:32 AM   eBay Motors  #100 (permalink)
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I did the delete and seen a 4 MPG increase (18-22) and the new throttle response was ridiculous. I was passing people on the highway like a race car.
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