how to tune spark at low-load and EGT tuning
I searched and searched, don't bitch unless you can find the link.
I just got my car back from tuning, and well, I'm a bitch and a little nervous about the turbo and manifold glowing all the time. After I run the car moderately hard, the turbo and manifold will glow for at least 15-minutes (I got tired of waiting in the cold to go further) at idle. There is a ton of exhaust pressure through the pipe at idle, and I can advance spark quite a bit with the car still idling fine and the exhaust turbulence noise and pressure drop significantly. So what should I do aside from installing the Greddy EGT I have in the trunk make sure everything is safe? Is there a general how-to on spark tuning at cruise without EGT? Once I install the EGT, what are my target temps, or do I just look for the EGT drop-off? I really want to log EGT and compare it to spark-angle in megatune...that would be cool. Thanks |
You're manifold is glowing just from driving around out of boost? If that's the case, something is plugged up.
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Originally Posted by m2cupcar
(Post 354229)
You're manifold is glowing just from driving around out of boost? If that's the case, something is plugged up.
I'm about to drive the car from Austin to Houston, to Dallas, then back to Austin, so I'm going to fix this today. |
Originally Posted by hustler
(Post 354230)
I drove the car hard for a while, drove about 3-miles back to the hotel, popped the hood and the turbo was beat red for another 15-minutes until I just turned it off. It was dark out too, so take that into consideration before you scare me. Will the ceramic coating hold heat in, that long or cause more glowing. Regardless of the inference, I know the right answer is to hook-up the EGT.
1) Take it easy on the car until you... 2) Install the EGT Turbos do tend to glow after hard use, but it'd be good to have hard EGT data so you can know that everything is ok. If temps are within reason but you find you want to end the glowing, send the manifold and hot side off to jet hot for some jet hot 2000 coating action. It's probably way cheaper than you think and, especially if you also do the downpipe, the difference in underhood temps will be incredible. |
go to the timing thread and realize you aren't running ~40 degrees of advance at light cruise and then come back and tell us why not.
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Originally Posted by deliverator
(Post 354232)
I suggest:
1) Take it easy on the car until you... 2) Install the EGT Turbos do tend to glow after hard use, but it'd be good to have hard EGT data so you can know that everything is ok. If temps are within reason but you find you want to end the glowing, send the manifold and hot side off to jet hot for some jet hot 2000 coating action. It's probably way cheaper than you think and, especially if you also do the downpipe, the difference in underhood temps will be incredible. http://i36.tinypic.com/aebebn.jpg The heat shielding over the turbine housing was hot but didn't burn my fingers....I wonder if that has anything to do with the glowing. I doubt begi would give it back to me with potential drama like this, but I want to be certain so I can sleep tonight...with lots of women at the same time. |
Originally Posted by y8s
(Post 354237)
go to the timing thread and realize you aren't running ~40 degrees of advance at light cruise and then come back and tell us why not.
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if they built and tuned it, then they had better fix it if it breaks because of a tuning problem. Not saying there is a problem, but it would make me feel better about my car.
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Fail. Post your spark map.
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Originally Posted by patsmx5
(Post 354284)
Fail. Post your spark map.
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edit: my gauge is whacked out and reading incorrectly:
http://i39.tinypic.com/976zqq.jpg perfect AFR from Tim at BEGi (the enchanter?) http://i41.tinypic.com/2hd1c3a.png why would they put afr's at 10.0:1? and here is the spark table after I switched the idle cells from 13 to 17, and there is now much less exhaust pressure: http://i39.tinypic.com/2h848hs.jpg |
That's all weird. You need to figure out if your wideband is right. And why is boost constantly changing? It should be flat. Your spark map is kinda weird. Not optimal. And why only 200hp?
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Originally Posted by patsmx5
(Post 354457)
That's all weird. You need to figure out if your wideband is right. And why is boost constantly changing? It should be flat. Your spark map is kinda weird. Not optimal. And why only 200hp?
I don't know what to do about the MAP signal, I'm already T'd off the FPR vac hose, maybe I need the filter. Please be more specific on the spark map. |
About the glowing manifold, it doesn't take much to make cast iron glow. Here's a chart:
Metal Temperature by Color |
Originally Posted by DammitBeavis
(Post 354471)
About the glowing manifold, it doesn't take much to make cast iron glow. Here's a chart:
Metal Temperature by Color |
It's a new motor and it's breaking in. That's why it's hot and that's why it's not raping the dyno. Give it 5K miles and redyno.
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Originally Posted by patsmx5
(Post 354476)
It's a new motor and it's breaking in. That's why it's hot and that's why it's not raping the dyno. Give it 5K miles and redyno.
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Originally Posted by hustler
(Post 354449)
edit: my gauge is whacked out and reading incorrectly:
http://i39.tinypic.com/976zqq.jpg perfect AFR from Tim at BEGi (the enchanter?) http://i41.tinypic.com/2hd1c3a.png edit: When was the last time you calibrated the LC-1? |
For you EGTs Hustler:
https://www.miataturbo.net/forum/t29678/#post345982 Able to log in megatune, i would sell your gauge and do what savington and i plan to do. You will probably end up with extra money after the sale of the gauge as well. |
Originally Posted by Savington
(Post 354507)
I would take one look at that boost curve and tell the tuner he wasn't done. That's bullshit. It's not a damn Whipple.
edit: When was the last time you calibrated the LC-1? It did really well on the way to Houston last night. It walked a new mustang gt from 80mph to 130mph by a hair, and it pulled a 350z 4-times in 5th gear...the guy asked if it was an automtic, lol. Now I'm done driving like a child and will get this car ready for track pillaging. When do you think the cops will ship? |
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