EGT's
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EGT's

  1. #1
    BTC cardcarrying member sunkisst's Avatar
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    Default EGT's

    Anyone here been monitoring/tuning by their exhaust gas temps on a boat ? What kind of numbers do you look for, and how do you go about lowering or raising them. I have researched it and I have figures in my mind, I also know my approach at changing temps. I want your input. I purchased a Computech EGT Plus system and just finished the install, which was a piece of cake. Off to gather some data this weekend, thanks for your input, Jack.
    Last edited by sunkisst; 09-11-2013 at 01:24 PM.

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    Senior Member SHAWN DAVIS's Avatar
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    Hard to correlate egts from one application to another, egt probe location and even header material will affect temp readings. On setups where you can tune cylinder to cylinder get a good plug reading and then use the egts as a general baseline.
    I burnt many a piston (when I first got the racepak) With what I thought was a safe temperture reading.
    With My screw blown alky wedge 481x it was around 1150 before it got nasty.
    Only blown gas application I ran one on showed around 1250 under power, low timing brings the temp up as does a lean mixture

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    Ain't Right Racin piston in the wind's Avatar
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    The egt's are just for data to tell if a hole is cooling off down track ect. Timing affects temp as well as a rich condition. Read the plugs get it tuned in then the egt's are worth reading. If one hole is always at say 1200 deg and it's at 800 you know there's a problem in that hole.
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    BTC cardcarrying member sunkisst's Avatar
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    Here's the deal. Natural aspirated, single carb. I intend to get the tune by reading plugs. Then look at EGT's. I intend to spray this engine a little. My builder said to get my EGT's the same as they were before the spray. Thoughts ?

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    Platinum Member BigSteve's Avatar
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    Quote Originally Posted by sunkisst View Post
    Here's the deal. Natural aspirated, single carb. I intend to get the tune by reading plugs. Then look at EGT's. I intend to spray this engine a little. My builder said to get my EGT's the same as they were before the spray. Thoughts ?
    Like what the guys are saying about the plug readings and probe location

    I have used them on O/B motors for years

    It did turn me on to a problem, wide open the plugs and temps looked good

    but, just short of wide open @ a high speed cruise it was going way to lean

    Once you have determined a good safe base line setting and then stepping up to NOS run. It can help alert you to mixture problem
    Last edited by BigSteve; 09-11-2013 at 06:49 PM.

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    Quote Originally Posted by sunkisst View Post
    Anyone here been monitoring/tuning by their exhaust gas temps on a boat ? What kind of numbers do you look for, and how do you go about lowering or raising them. I have researched it and I have figures in my mind, I also know my approach at changing temps. I want your input. I purchased a Computech EGT Plus system and just finished the install, which was a piece of cake. Off to gather some data this weekend, thanks for your input, Jack.
    tune off A/F the EGT's will be where they are, high or low.

    I've read where an engine that have balanced egt's are smoother running ....... but that was a magazine article so who knows

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    Quote Originally Posted by sunkisst View Post
    Here's the deal. Natural aspirated, single carb. I intend to get the tune by reading plugs. Then look at EGT's. I intend to spray this engine a little. My builder said to get my EGT's the same as they were before the spray. Thoughts ?
    Basically I don't think you want to see the Nitrous runs vary greatly from the N/A runs. Not a great amount higher or lower.

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    Quote Originally Posted by Gearhead View Post
    Basically I don't think you want to see the Nitrous runs vary greatly from the N/A runs. Not a great amount higher or lower.
    jetted properly I think they'd be about the same.....

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    steelcomp was here
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    Tuning off EGT's can get you in big trouble if your'e not careful. Like already said...tune off of O2's if you can or plugs and EGT's will be where they are.
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    BTC cardcarrying member sunkisst's Avatar
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    I guess I will stay with my original plan then, tune by plugs then watch temps while on the spray. Thanks for the input.

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    Senior Member stix818's Avatar
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    Quote Originally Posted by steelcomp View Post
    Tuning off EGT's can get you in big trouble if your'e not careful. Like already said...tune off of O2's if you can or plugs and EGT's will be where they are.
    I agree Steel, especially if your going to spray the engine.. When I was running EGTs on my Pontiac I just used them for data and not tuning.. When I started spraying the motor harder and retarding the motor more the EGTs would go up and some of the guys in my pit thought we were lean but that wasn't the case!!! I would prefer O2 readings over EGTs.. But the plugs will tell you almost everything you need..
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    Tuning by EGT is one of the worst ways to check your tune. EGT will be hi when, timing is low, mixture is rich, mixture is lean and EGT will be ok when you are somewhere in the middle. When you move timing you will see EGT get hotter and colder, so when you activate the nitrous and the timing is retarded and the solenoid is pushing more fuel your EGTs will go up. That is normal. My turbo engine last year in Vegas had EGT of 1700 degrees the whole pass, it didn't burn a piston or cause any problems. So it's good data but be careful, A good wideband O2 would get you much farther along.

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