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Thread: Effect of rich condition on EGT?

  1. #1
    Hybrid booster guyd_15's Avatar
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    Effect of rich condition on EGT?

    Sneaking up on our new tune up. Installed the EGT gauge to complement the Dawes Device.
    I believe I read once that a rich condition can cause elevated EGT readings. And I just wanted to ask you guys what you thought.

    Took the car for a short ride at WOT the Dawes reads blue (rich) while at the same time EGT readings reached about 1650 (ambient temperature about 60 F). Pulled the plugs they look good (a little black) the car does display the symptoms of being rich, spools a little slow and some break up under boost. Boost is at 12lbs on a 15lb cal. Fuel pressure is 55lbs static.

    If you need to know the car set up
    2.2/swirl
    88 TBI cam
    +40's
    TU 3 Bar cal 15lb/29lb switchable
    Super 70/.63 turbine housing
    2 core intercooler
    3" swingvalve
    3" downpipe
    3" cut out

    Thanks,
    Guy

  2. #2
    Heroes never die, they just reload! Turbo Mopar Staff Frank's Avatar
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    Re: Effect of rich condition on EGT?

    Rich means EGT's will go down. However based on what you just said, high EGT but obvious rich condition, you arent running enough timing.


    Frank
    Frank Katzenberger
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  3. #3
    Hybrid booster guyd_15's Avatar
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    Re: Effect of rich condition on EGT?

    Thanks, Frank. Are you talking about ignition or cam timing?
    I forgot to mention the head had the deck cleaned up, when I was at E-Town DBL TRBL checked the timing with me and it was aboth a 1/2 tooth retarded, combined with the round tooth cam switched to square pulley I bet I'm close to 3/4 of a tooth off.
    Guy

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    Heroes never die, they just reload! Turbo Mopar Staff Frank's Avatar
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    Re: Effect of rich condition on EGT?

    I was talking about ignition timing. I dont know about the cam timing if it would cause that.
    Frank Katzenberger
    Squirrel Performance - Home of the best turbo calc!!!
    http://www.squirrelpf.com


    91 Daytona Shelby - It is getting there

    87 Shelby CSX #418 - Near stock is a good thing!

    94 Bronco 302 XLT - Shorty Headers, 3" exhaust, cold air intake, & Soft top



    "... to get the best out of it, you have to go beyond the line. Where bravery becomes insanity. Shall I turn into this hairpin bend at a 100mph? Why not!"



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  5. #5
    Hybrid booster guyd_15's Avatar
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    Re: Effect of rich condition on EGT?

    Thanks, I'll bump it up a couple degrees and see what happens.
    Guy

  6. #6
    Heroes never die, they just reload! Turbo Mopar Staff Frank's Avatar
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    Re: Effect of rich condition on EGT?

    I dont know if that will do it. Base timing wont have enough of an effect for that... its the timing in boost. With the EGT's you are running, do not back down fuel. So what is the scanner reporting for knock on this? It should be pretty dang low. Sounds like you may need a cal update.


    Frank
    Frank Katzenberger
    Squirrel Performance - Home of the best turbo calc!!!
    http://www.squirrelpf.com


    91 Daytona Shelby - It is getting there

    87 Shelby CSX #418 - Near stock is a good thing!

    94 Bronco 302 XLT - Shorty Headers, 3" exhaust, cold air intake, & Soft top



    "... to get the best out of it, you have to go beyond the line. Where bravery becomes insanity. Shall I turn into this hairpin bend at a 100mph? Why not!"



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  7. #7
    Hybrid booster guyd_15's Avatar
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    Re: Effect of rich condition on EGT?

    I'll hook up the OTC 4000 tonight and see what it says before I change the ignition timing.
    Guy

  8. #8
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    Re: Effect of rich condition on EGT?

    I have a similar issue due to running too high compression on a 2.5 with a swirl head. Head was shaved too much.

  9. #9
    Heroes never die, they just reload! Turbo Mopar Staff Frank's Avatar
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    Re: Effect of rich condition on EGT?

    I forgot one thing guy... You could also have to big of a gap on your spark plugs... make them around 24.


    Frank
    Frank Katzenberger
    Squirrel Performance - Home of the best turbo calc!!!
    http://www.squirrelpf.com


    91 Daytona Shelby - It is getting there

    87 Shelby CSX #418 - Near stock is a good thing!

    94 Bronco 302 XLT - Shorty Headers, 3" exhaust, cold air intake, & Soft top



    "... to get the best out of it, you have to go beyond the line. Where bravery becomes insanity. Shall I turn into this hairpin bend at a 100mph? Why not!"



    Visit the new Knowledge Center today!

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  10. #10
    turbo addict
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    Re: Effect of rich condition on EGT?

    Do you think it's possible this is running so rich, that the fuel continues to burn after it leaves the combustion chamber?
    Just a thought, but I agree with ignition timing.

  11. #11
    Super Moderator Turbo Mopar Staff contraption22's Avatar
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    Re: Effect of rich condition on EGT?

    Quote Originally Posted by shadow88 View Post
    Do you think it's possible this is running so rich, that the fuel continues to burn after it leaves the combustion chamber?

    The same could be true for retarded ignition timing.
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  12. #12
    Hybrid booster guyd_15's Avatar
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    Re: Effect of rich condition on EGT?

    Didn't get the scanner hooked up last night, probably have to wait for Wednesday night at the track.
    Thanks for the replys guys. My kid wants to get it right before Cecil.
    Guy

  13. #13
    Hybrid booster
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    Re: Effect of rich condition on EGT?

    I think Shadow88 is on to something.. It my understanding that if the probe is in the manifold runner,rich will lower the EGT's. If the probe is in the down pipe(After the turbo) That EGT's from bein rich will be hotter.

    I'll get that link after a bit...

  14. #14
    Hybrid booster guyd_15's Avatar
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    Re: Effect of rich condition on EGT?

    No more Wednesday night at Cecil, guess I have to wait until tommorow night.
    Guy

  15. #15
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    Re: Effect of rich condition on EGT?

    Quote Originally Posted by shadow88 View Post
    Do you think it's possible this is running so rich, that the fuel continues to burn after it leaves the combustion chamber?
    Just a thought, but I agree with ignition timing.
    If that was the case, the turbo would spool fast due to the energy release of the expanding heat build up by the gas explotions after the cumbustion chamber and before the turbo. Try closing the gap on the plugs like frank said and recheck your ign. timming.

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