changing injectors, how does my dash display calculate fuel economy - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

general23cmp · 11-14-2009, 01:40 PM

I'm going to be changing fuel injectors soon (and the computer's parameters accordingly). I was just wondering how the fuel economy display on my dash calculates its value. Will it be forever wrong after the swap, or will it use the new injector parameters in the ECU?

camaro1 · 11-15-2009, 11:26 AM

not sure if just the inj size/scaling tables will effect the cluster mileage calculation,, i do know that after i tuned my VE table the fuel mileage is no longer even close in the cluster

general23cmp · 11-15-2009, 12:10 PM

Yep....some folks are reporting huge MPG gains when doing forced induction and such, but I fear they are relying on their cluster.

axis · 11-15-2009, 12:18 PM

Quote:

Originally Posted by general23cmp

Yep....some folks are reporting huge MPG gains when doing forced induction and such, but I fear they are relying on their cluster.

It's impossible to get HUGE MPG increases, especially when going FI. The best you can hope for is the same or maybe a tad more from a better tune. Obviously, this is footpedal dependent as your MPG will DROP MASSIVELY when you spool it up. I could damn near watch my gas gauge drop when I was racing my 500whp turbo talon, yet got 26mpg cruising down the highway. That's about what they get in stock form.

Matt TuneTime · 11-21-2009, 02:07 PM

Quote:

Originally Posted by general23cmp

I'm going to be changing fuel injectors soon (and the computer's parameters accordingly). I was just wondering how the fuel economy display on my dash calculates its value. Will it be forever wrong after the swap, or will it use the new injector parameters in the ECU?

This is all base on all of the injector flow data . Make sure it's correct .

Steve@Vectormotorsports · 11-23-2009, 08:49 AM

Quote:

Originally Posted by Matt TuneTime

This is all base on all of the injector flow data . Make sure it's correct .

X2

mtcwby · 11-26-2009, 07:51 PM

I've driven over 2000 miles after the Vortech install and 66# injectors.
I reset the mpg in the DIC before my trip to AZ and kept my gas receipts
for the 1300 mile trip. My actual mpg's were within .2 mpg of the DIC display.
So I'd say that the DIC is not effected by the change.

camaro1 · 11-27-2009, 11:16 AM

if you adj your virtual VE table your dic will not read correct

DallasPerformance · 12-03-2009, 02:35 AM

Quote:

Originally Posted by Matt TuneTime

This is all base on all of the injector flow data . Make sure it's correct .

Not sure how it works on these things. However it doesn't work that way on the vettes. It uses IPW or IDC to calculate mileage depending on year model. No way to alter that to reflect correct values in the display.

Matt TuneTime · 12-03-2009, 08:24 AM

Quote:

Originally Posted by DallasPerformance

Not sure how it works on these things. However it doesn't work that way on the vettes. It uses IPW or IDC to calculate mileage depending on year model. No way to alter that to reflect correct values in the display.

If your Injector Data is off , not just the flow rate. Then your DIC will not read right [ your IPW or IDC will be off also ]. If all of the injector tables are correct for your Injectors [ The company would have had to publish the data AKA ford motorsports ] Then your DIC will be very close, even with a 79 lb injector ...

11-14-2009, 01:40 PM	#1
general23cmp Drives: 2010 RS SS Join Date: Aug 2009 Location: Huntsville, AL Posts: 196	changing injectors, how does my dash display calculate fuel economy I'm going to be changing fuel injectors soon (and the computer's parameters accordingly). I was just wondering how the fuel economy display on my dash calculates its value. Will it be forever wrong after the swap, or will it use the new injector parameters in the ECU?

11-15-2009, 11:26 AM	#2
camaro1 Drives: 550+RWHP 2010 camaro Join Date: Sep 2007 Location: wisconsin Posts: 1,588	not sure if just the inj size/scaling tables will effect the cluster mileage calculation,, i do know that after i tuned my VE table the fuel mileage is no longer even close in the cluster __________________ 415ci stroker, TVS 2300 Magnacharger, cnc heads, cam, yank ss3200 converter, Kooks long tubes, Bwoody true cold air kit, ZL1 Pump, magnaflow 3" cat-back, lowering springs,BMR control arms and tie rod bars, 3.73 gears, diff mounts, RX can, ADM fuel controller

11-26-2009, 07:51 PM	#7
mtcwby High on "The Camaro Life" Drives: 2010 2SS, IOM, LS3, Vortech, LG cam Join Date: May 2009 Location: Big Sandy, MT & Yuma, AZ Posts: 1,028 View My Garage	I've driven over 2000 miles after the Vortech install and 66# injectors. I reset the mpg in the DIC before my trip to AZ and kept my gas receipts for the 1300 mile trip. My actual mpg's were within .2 mpg of the DIC display. So I'd say that the DIC is not effected by the change. __________________ "The democracy will cease to exist when you take away from those who are willing to work and give to those who are not."-Thomas Jefferson------Going Strong at 39,250 miles

11-27-2009, 11:16 AM	#8
camaro1 Drives: 550+RWHP 2010 camaro Join Date: Sep 2007 Location: wisconsin Posts: 1,588	if you adj your virtual VE table your dic will not read correct __________________ 415ci stroker, TVS 2300 Magnacharger, cnc heads, cam, yank ss3200 converter, Kooks long tubes, Bwoody true cold air kit, ZL1 Pump, magnaflow 3" cat-back, lowering springs,BMR control arms and tie rod bars, 3.73 gears, diff mounts, RX can, ADM fuel controller

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11-15-2009, 12:10 PM	#3
general23cmp Drives: 2010 RS SS Join Date: Aug 2009 Location: Huntsville, AL Posts: 196	Yep....some folks are reporting huge MPG gains when doing forced induction and such, but I fear they are relying on their cluster.