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34 mpg!?!?

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Old Apr 18, 2011 | 06:14 PM
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Default 34 mpg!?!?

I recently supercharged my car and rolled off the dyno last Tuesday. The car is bone stock other than the ECS system with the Paxton charger and a Speed Density tune that was sent by ECS and tweeked by G.R.E.A.D tuning out of suthern Indiana. I was very happy with the results even with the 110,000 miles on the car. I set out for my 3.5 to 4 hour trip to Pidgeon Forge TN for the Rod Run car show last Friday and as I was leaving I filled up with gas and reset my fuel milage on the display. I was so happy when I arrived in TN with the 34 mpg. (and fyi, I am 22 years old and yes I wanted to hear the bov several times with a few 6k rpm pulls) I was happy and yet skeptical so I reset it on my way back, taking it easy at first, I went almost 100 miles and was show 37.5 mpg until I ran into a Maserati on the interstate. I was still able to arrive back home with the 34.x mpg on the dash! I didn't get the pen and paper out to verify it this time but on numerous times before the car has been spot on, within 1 or 2 mpg!
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Old Apr 18, 2011 | 07:25 PM
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The larger fuel injectors that came with the supercharger are throwing off our fuel consumption calculations. Get out the pencil and paper
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Old Apr 18, 2011 | 07:56 PM
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Ok Thanks! I meant to put this in the form of a question but I see I didn't lol. I will do that and see what the true numbers are because I thought this was crazy high numbers.
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Old Apr 18, 2011 | 08:34 PM
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You can't rely on the DIC after supercharging. Use the tried and true pen & paper. I had a difference of 5 mpg between actual calculations and the DIC.
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Old Apr 19, 2011 | 12:54 AM
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The only way to know your fuel economy is to divide the # of miles on the tank by the # of gallons. You're not getting anywhere near 37 MPG.
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Old Apr 19, 2011 | 01:31 AM
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injectors over 63.5 pounds will cause the DIC to be off, if below, it will be spot on if the tune is right.

09 and up c6's will be spot on up to 127lbs.

-Carl

Last edited by carlrx7; Apr 19, 2011 at 01:35 AM.
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Old Apr 19, 2011 | 02:16 PM
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Originally Posted by carlrx7
injectors over 63.5 pounds will cause the DIC to be off, if below, it will be spot on if the tune is right.

09 and up c6's will be spot on up to 127lbs.

-Carl

and.... Injectors up to 52 #, for 2006 & 2007 E38 ECMS will read spot of if they don't have a scaled tune from Edelbrock.

2008+ goes to 63.5 #

2009+ go to 127 #


Elmer
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Old Apr 19, 2011 | 03:15 PM
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On a recent 110 mile highway ride to Atlantic City in a Cartek Pro Charged/blower cammed C6 Z06 (not my car) I saw over 30mpg at 70+mph on the DIC but I too assume that it might not have been entirely accurate.
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Old Apr 19, 2011 | 04:24 PM
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Have to check it the old fashion way.
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Old Apr 19, 2011 | 04:27 PM
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I'm running 27-28 on the highway at 75. High teens in the city. So I'd guess a 22-23 average.


Elmer
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Old Apr 19, 2011 | 06:08 PM
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It's amazing how efficient these cars really are. I get 17mpg traveling 75-80mph on the highway. On the gas around town is a whole different story.
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Old Apr 19, 2011 | 06:22 PM
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Originally Posted by aTX427
It's amazing how efficient these cars really are. I get 17mpg traveling 75-80mph on the highway. On the gas around town is a whole different story.
17? Ha! Don't you have two LS somethings stuffed under that hood?
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Old Apr 19, 2011 | 10:58 PM
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17 on a supercharged car isnt to bad....

I used to average about 21 (mixed traffic, back roads and some highway)

not a LOT more happy pedal and down to 17 :P but with 600rwhp
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Old Apr 22, 2011 | 06:03 PM
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Before S/C - 32MPG and spot on (I have pictures of it too.)
After S/C - the DIC reads 3MPG higher than pencil and paper shows it to be (well, actually "calc.exe").
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Old Apr 22, 2011 | 08:52 PM
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im 17 city 22 hwy with e85 previously with 92 it was 22/27
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Old Apr 23, 2011 | 08:31 PM
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Originally Posted by carlrx7
injectors over 63.5 pounds will cause the DIC to be off, if below, it will be spot on if the tune is right.

09 and up c6's will be spot on up to 127lbs.

-Carl
nope even with 60's the DIC is 17 percent over
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Old Apr 23, 2011 | 09:13 PM
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Originally Posted by Rock'n Blue 08
nope even with 60's the DIC is 17 percent over
because the 60#'s are really 72# injectors.
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Old Apr 24, 2011 | 09:47 AM
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Originally Posted by Rock'n Blue 08
nope even with 60's the DIC is 17 percent over
Out of curiosity...


Are you using the E-Force tune or a local tune made from the base tune and adjusted for the SC?


Elmer
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