LS3 CAI MPG loss - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

herkman · 07-16-2009, 12:51 PM

Has anyone experienced this? My M6 2SS got 22 MPG on the first tank of gas. I filled up before my Hennessey cold air kit came in. First of all I was disappointed to find out that if you want the air box shield (check the small print on their add) that it is $100 extra. I have read that a CAI filter needs to be protected from direct engine heat for best performance. Well, I installed the kit without the box and now I am only getting 14.2 MPG! Nothing else is any different other than the CAI addition. My buddy who is a sheet metal fabrication specialist is going to make the shield for me. If that doesn't show any improvement, I'll have a CAI for sale cheap! I have had kits on at least five other vehicles and have always experienced either the same or 1-2 MPG improvement, never a loss.

Baughman · 07-16-2009, 12:54 PM

Hmmm.... very interesting. Let us know how it goes man.

jpsuperman81 · 07-16-2009, 12:54 PM

I might affect mpg but not that much, something else is going on. Have you tried resetting the mpg and dirving another full tank.

Crowley · 07-16-2009, 12:55 PM

Are you stomping on the gas pedal alot more? Any before and after dynos so you can review A/F Ratio?

thanks,
Crowley

thecamaroguy · 07-16-2009, 01:01 PM

Why not put the stock one back on and see if it improves.

Maybe you have something else wrong.

herkman · 07-16-2009, 01:01 PM

I'll let everyone know how it goes, I haven't changed my driving pattern and I did reset my mileage when I filled up. I will also run another tankfull through it.
I don't have my 500 miles on it, so haven't gotten real froggy yet.

Mike P · 07-16-2009, 01:01 PM

Quote:

Originally Posted by herkman

Has anyone experienced this? My M6 2SS got 22 MPG on the first tank of gas. I filled up before my Hennessey cold air kit came in. First of all I was disappointed to find out that if you want the air box shield (check the small print on their add) that it is $100 extra. I have read that a CAI filter needs to be protected from direct engine heat for best performance. Well, I installed the kit without the box and now I am only getting 14.2 MPG! Nothing else is any different other than the CAI addition. My buddy who is a sheet metal fabrication specialist is going to make the shield for me. If that doesn't show any improvement, I'll have a CAI for sale cheap! I have had kits on at least five other vehicles and have always experienced either the same or 1-2 MPG improvement, never a loss.

You might need a ECM/TCM tune to go with that cai. When some G8s do a cai without a tune you can sometimes loose RWHP and 1/4 time.

I'd go with a Vararam, RotoFab, or New Era cai............

....

bobby35ny · 07-16-2009, 01:06 PM

WAIT!!
nvm the mpg loss, They get another 100 for the shield? AMAZING!!

-bobby

SoFlaZ · 07-16-2009, 01:12 PM

Maybe the MAF isn't properly re-connected?

Crowley · 07-16-2009, 01:16 PM

Quote:

Originally Posted by SoFlaZ

Maybe the MAF isn't properly re-connected?

was just going to say something about this? Does the intake remount the MAF? Could there be some issue with the way it is mounted?

Crowley

Sales@Hennessey · 07-16-2009, 01:18 PM

Hey guys... Thanks for the post and the concern... With any performance modifications where you dont have the vehicle tuned, you have to let the car adapt to the upgrades. I usually suggest 50 miles however with a new car under 5,000 miles, it may take slightly longer. You are completely changing the Fuel Trim Adaptives and Volumetric Efficiency of the motor with the addition of Headers or Intake system.

On a side note, we have all added intakes, headers and exhausts to our vehicles and not a single one of us can say we haven't gone out and punched it just to see how the items sound and the seat of the pants performance we can feel! Give it a tank or two of gas. You will see atleast the same MPG if not an increase! Also definitely check that the MAF is installed correctly.

Any additional questions, feel free to call me at the office, 979-885-1300

James

jpsuperman81 · 07-16-2009, 01:19 PM

Quote:

Originally Posted by Sales@Hennessey

Hey guys... Thanks for the post and the concern... With any performance modifications where you dont have the vehicle tuned, you have to let the car adapt to the upgrades. I usually suggest 50 miles however with a new car under 5,000 miles, it may take slightly longer. You are completely changing the Fuel Trim Adaptives and Volumetric Efficiency of the motor with the addition of Headers or Intake system.

On a side note, we have all added intakes, headers and exhausts to our vehicles and not a single one of us can say we haven't gone out and punched it just to see how the items sound and the seat of the pants performance we can feel! Give it a tank or two of gas. You will see atleast the same MPG if not an increase! Also definitely check that the MAF is installed correctly.

Any additional questions, feel free to call me at the office, 979-885-1300

James

JJ#48Racing · 07-16-2009, 01:19 PM

Make sure everything is connected properly. Give your ECM time to adjust to the change (could take up to 200 miles). But most likely, you're just getting on the gas more often than you did with the first tank.

wantsa2ssrs · 07-16-2009, 01:24 PM

Quote:

Originally Posted by Sales@Hennessey

Hey guys... Thanks for the post and the concern... With any performance modifications where you dont have the vehicle tuned, you have to let the car adapt to the upgrades. I usually suggest 50 miles however with a new car under 5,000 miles, it may take slightly longer. You are completely changing the Fuel Trim Adaptives and Volumetric Efficiency of the motor with the addition of Headers or Intake system.

On a side note, we have all added intakes, headers and exhausts to our vehicles and not a single one of us can say we haven't gone out and punched it just to see how the items sound and the seat of the pants performance we can feel! Give it a tank or two of gas. You will see atleast the same MPG if not an increase! Also definitely check that the MAF is installed correctly.

Any additional questions, feel free to call me at the office, 979-885-1300

James

Outta curiosity, you guys gonna make that shield cheaper? $100 is pretty steep for just a heat shield.

07-16-2009, 12:51 PM	#1
herkman Drives: 2010 IOM SS/RS, 69 Camaro Join Date: Nov 2008 Location: Douglasville, Georgia Posts: 563	LS3 CAI MPG loss Has anyone experienced this? My M6 2SS got 22 MPG on the first tank of gas. I filled up before my Hennessey cold air kit came in. First of all I was disappointed to find out that if you want the air box shield (check the small print on their add) that it is $100 extra. I have read that a CAI filter needs to be protected from direct engine heat for best performance. Well, I installed the kit without the box and now I am only getting 14.2 MPG! Nothing else is any different other than the CAI addition. My buddy who is a sheet metal fabrication specialist is going to make the shield for me. If that doesn't show any improvement, I'll have a CAI for sale cheap! I have had kits on at least five other vehicles and have always experienced either the same or 1-2 MPG improvement, never a loss.

07-16-2009, 12:54 PM	#2
Baughman Drives: Black 2SS/RS Join Date: Mar 2009 Location: Fort Worth, Texas Posts: 475	Hmmm.... very interesting. Let us know how it goes man. __________________ Black/Black, 2SS/RS, Manual, and Polished 20's VIN# 28396

07-16-2009, 01:06 PM	#8
bobby35ny Drives: 18 ZL1 A10 Join Date: Nov 2008 Location: South East, FL Posts: 3,024	WAIT!! nvm the mpg loss, They get another 100 for the shield? AMAZING!! -bobby __________________ 2017 ZL1 M6 Bog City, 2013 ZL1 M6, 2010 2SS M6 ZL1::J-E-T-S JETS JETS JETS

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07-16-2009, 12:54 PM	#3
jpsuperman81 Yep I'm back! Drives: 2017 Krypton Green 1SS 1LE Join Date: Mar 2009 Location: Indian Trail, NC Posts: 2,565 View My Garage	I might affect mpg but not that much, something else is going on. Have you tried resetting the mpg and dirving another full tank.

07-16-2009, 12:55 PM	#4
Crowley Okie doke Drives: 2012 GT500 Join Date: Sep 2008 Location: McKinney Texas Posts: 3,568 View My Garage	Are you stomping on the gas pedal alot more? Any before and after dynos so you can review A/F Ratio? thanks, Crowley __________________

07-16-2009, 01:01 PM	#5
thecamaroguy Drives: 2020 ZLE 67 SS350 Join Date: Jul 2008 Location: Kentucky Posts: 537	Why not put the stock one back on and see if it improves. Maybe you have something else wrong.

07-16-2009, 01:12 PM	#9
SoFlaZ Drives: 2013 SS LS3 Join Date: Feb 2007 Location: WPB FL Posts: 947 View My Garage	Maybe the MAF isn't properly re-connected?

07-16-2009, 01:18 PM	#11
Sales@Hennessey Drives: 2010 Camaro Join Date: May 2009 Location: Houston, TX Posts: 599	Hey guys... Thanks for the post and the concern... With any performance modifications where you dont have the vehicle tuned, you have to let the car adapt to the upgrades. I usually suggest 50 miles however with a new car under 5,000 miles, it may take slightly longer. You are completely changing the Fuel Trim Adaptives and Volumetric Efficiency of the motor with the addition of Headers or Intake system. On a side note, we have all added intakes, headers and exhausts to our vehicles and not a single one of us can say we haven't gone out and punched it just to see how the items sound and the seat of the pants performance we can feel! Give it a tank or two of gas. You will see atleast the same MPG if not an increase! Also definitely check that the MAF is installed correctly. Any additional questions, feel free to call me at the office, 979-885-1300 James

07-16-2009, 01:19 PM	#13
JJ#48Racing Drives: 1998 Camaro SS Join Date: Oct 2008 Location: Lancaster, CA Posts: 1,115	Make sure everything is connected properly. Give your ECM time to adjust to the change (could take up to 200 miles). But most likely, you're just getting on the gas more often than you did with the first tank.