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Old 04-24-2007, 10:08 PM   #21
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Quote:
Originally Posted by jayc72 View Post
The problem with #4 running how has to do with the coolant routing and not the EGT.
And that it's the last one on the rail and tends to slightly less fuel.

-Mike
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Old 04-24-2007, 10:10 PM   #22
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Originally Posted by grippgoat View Post
And that it's the last one on the rail and tends to slightly less fuel.

-Mike
Thus the reason many people do the DIY dual-feed rail mod.
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Old 04-24-2007, 10:58 PM   #23
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High EGTs can also be due to too little fuel ... so yes, use as many tools as possible.

Try putting the IAT in the manifold for best results .... if not as close as possible to the manifold.
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Old 04-25-2007, 12:24 AM   #24
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Think I might do that. Thinking about taking the upperintake off and putting the IAT in the back wall of the manifold. See anything wrong with that? I like the idea of the ugly GM IAT being hidden back there.
Then again, i also like the idea of drilling and tapping my IC piping instead of my mani. We'll see.
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Old 04-25-2007, 03:20 AM   #25
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I have 4 EGT probes in my N/A engine with 270cc injectors. #1 runs the hottest, with #2-#3-#4 being the runner ups (in that particular order).

Check this thread for more info: http://forum.miata.net/vb/showthread.php?t=217268
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Old 04-25-2007, 01:46 PM   #26
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Quote:
Originally Posted by Reverant View Post
I have 4 EGT probes in my N/A engine with 270cc injectors. #1 runs the hottest, with #2-#3-#4 being the runner ups (in that particular order).

Check this thread for more info: http://forum.miata.net/vb/showthread.php?t=217268
Only applicable to the NB tho, as the NB's fuel rail is fed from the opposite side to the NA's (iirc) hence #4 being the hottest/leanest on NA's
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Old 04-25-2007, 04:20 PM   #27
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Originally Posted by cjernigan View Post
Think I might do that. Thinking about taking the upperintake off and putting the IAT in the back wall of the manifold. See anything wrong with that? I like the idea of the ugly GM IAT being hidden back there.
Then again, i also like the idea of drilling and tapping my IC piping instead of my mani. We'll see.
The intake manifold gets quite heat-soaked, and could badly bias the IAT's toward the hot end. I think intercooler pipe close to the throttle body is the way to go.

-Mike
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Old 04-25-2007, 04:25 PM   #28
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Quote:
Originally Posted by grippgoat View Post
The intake manifold gets quite heat-soaked, and could badly bias the IAT's toward the hot end. I think intercooler pipe close to the throttle body is the way to go.

-Mike
I really like getting advice like that. Hooray for not taking the IM off.
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Old 04-25-2007, 04:35 PM   #29
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Originally Posted by cjernigan View Post
I really like getting advice like that. Hooray for not taking the IM off.
I just hope it's good advice. It's the way I'm planning to do it, and it was recommended to me by some people that get paid to know that sort of thing. And my intake manifold gets HOT to the touch.

-Mike
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Old 04-25-2007, 04:38 PM   #30
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my IAT is in the IC pipe before the TB and it also gets heat soaked.
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Old 04-25-2007, 04:40 PM   #31
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Quote:
Originally Posted by Lex View Post
my IAT is in the IC pipe before the TB and it also gets heat soaked.
I read somwhere that megasquirt disregards the IAT sensor after a while because it knows it gets heat soaked actually. Wonder where I saw that.
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Old 04-25-2007, 04:42 PM   #32
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Nope, it does not, and it will pull fuel and make hot restarts really lean. That is unless you use the CLT calibration.
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