Thread: EGR Valve off/on status??'

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  1. #1
    VCA Member
    South Florida

    Join Date
    Dec 2012
    Posts
    66

    Question EGR Valve off/on status??'

    OK, trying to do my first custom tune with SCT + PRP + INNOVATE O2 WB sensors data logger. How do you know EGR is ON/OFF STATUS in order to modify cells?
    As far as I collected info, modify cells USING WIDEBAND AS DATALOGGER in this order:
    1. With engine at idle.
    2. Crusing, light throttle.
    3. Moderate throttle.
    4. WOT, from 1500 to 6000rpms 3rd gear (if AFR above 12.5 stop!).

    So again, How do I know which EGR OFF or ON cells to modify in each of above 4 scenarios?

  2. #2
    Viper Owner
    Join Date
    Sep 2003
    Location
    Cottage Grove, Wi.
    Posts
    1,640

    Default Re: EGR Valve off/on status??'

    The Viper motor does not have an EGR valve.

  3. #3
    VCA Member
    South Florida

    Join Date
    Dec 2012
    Posts
    66

    Default Re: EGR Valve off/on status??'

    I understand EGR OFF/ONN cells are used in SCT Pro Racer software to tune the car.
    Maybe not found as EGR valve under Mopar parts, but it seems this is it:
    http://www.moparpartsoverstock.com/p...4669475AB.html
    i2107415.jpg

    Anyway, there are two map tables (EGR ON/OFF) which are used to change AFR ratio in order to fine tune Vipers.

    Quote Originally Posted by steve911 View Post
    The Viper motor does not have an EGR valve.

  4. #4
    Viper Owner
    Join Date
    Mar 2011
    Location
    Sonoma Cownty
    Posts
    424

    Default Re: EGR Valve off/on status??'

    The duty cycle purge solenoid has nothing to do with Exhaust Gas Recirculation-- it's job is to take fumes from the fuel system that collect in the charcoal cannister and 'purge' the canister of fumes by letting them get drawn into the engine. I suppose the tuning map could compensate for the solenoid on Vs. off state, but it would be a small compensation. Does anyone know what operating conditions open the purge valve?

  5. #5
    VCA Member
    South Florida

    Join Date
    Dec 2012
    Posts
    66

    Default Re: EGR Valve off/on status??'

    This is a SCT PRP software window. There are two tables with cells in order to add or substract fuel: EGR OFF and EGR ON, this pic displays EGR OFF table. After reading Steve as Sonoman posts, there's NO EGR valve. So I am going to do some testing in order to find out which table is the one to consider for tuning my car.
    So my first asumption there was an EGR valve is WRONG.
    Thanks!



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