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#15
by
rabbitman
on 17 Oct, 2008 18:17
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If you have 3 cyl running 600 and one running 1200deg it will show up on your EGT as a higher reading than the 600 deg thus the "Combined stream" application.
Good point, so if you got one injector with a bad spray pattern or whatever it "should" show up, then you'd have to guess at which one it is. I'll keep that in mind for when I drill the mani for my vnt-15.
Probably drilling 6inches from the head were they all meet won't affect the reading too much anyhow as the exhaust gasses are moving perdy fast.
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#16
by
79rabbit4dr
on 18 Oct, 2008 17:49
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And tapping one for each cyl would probably be overkill, esp on my stock '81 1.6 NA. and by the time i get to upping the power it'd be better to upgrade to custom/ceramic coated headers anyway, right?
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#17
by
Jet A
on 20 Oct, 2008 09:16
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If you have 3 cyl running 600 and one running 1200deg it will show up on your EGT as a higher reading than the 600 deg thus the "Combined stream" application.
Good point, so if you got one injector with a bad spray pattern or whatever it "should" show up, then you'd have to guess at which one it is. I'll keep that in mind for when I drill the mani for my vnt-15.
Probably drilling 6inches from the head were they all meet won't affect the reading too much anyhow as the exhaust gasses are moving perdy fast.
One bad injector WILL show up as a hole in the piston..... :shock: not on the egt gauge. Especially if you push your egts!
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#18
by
zukgod1
on 20 Oct, 2008 09:54
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If you have 3 cyl running 600 and one running 1200deg it will show up on your EGT as a higher reading than the 600 deg thus the "Combined stream" application.
Good point, so if you got one injector with a bad spray pattern or whatever it "should" show up, then you'd have to guess at which one it is. I'll keep that in mind for when I drill the mani for my vnt-15.
Probably drilling 6inches from the head were they all meet won't affect the reading too much anyhow as the exhaust gasses are moving perdy fast.
One bad injector WILL show up as a hole in the piston..... :shock: not on the egt gauge. Especially if you push your egts!
It WILL show up on the gauge LONG before there is a hole in the piston.
Providing you are starting out with a healthy engine you will have a baseline, using that baseline you will know if there is a problem. Your EGT's will go up even with one bad injector.
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#19
by
8v-of-fury
on 21 Oct, 2008 19:11
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The sender needs to be as close to the head as possible and in the combined exhaust stream.
Why do you say that? Seems to me if you put it too far from the head just to get all four cylinders it would read cooler because of the extra distance from the head.
Yup.. your exactly right..
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#20
by
gldgti
on 21 Oct, 2008 21:44
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ok, apart from diagnosing a bad injector, lets say you have an egt guage to keep a general idea on how your current "tune" is affecting things.
i'm still using the stock k14 turbo on my aaz with stock manifold, which is the 3 bolt type with flange on the end just outside number 4 cylinder for EGR stuff.
now, i will be sticking my egt probe in the junction when i change to t3 and a 4 bolt mani soon, but for now its mounted in a blanking plate where the egr used to be. i see good response on the guage (within the same gear) and so far max EGT i've seen has been 520C (970F) (20psi, accelerating at WOT 4th gear up hill to 70mph).
i figured that since (when it counts) the pressure inside the exhaust manifold must be around 30psi and large flow rate, that the probe, wherever its placed, should give a reasonably good reading, even though its only behind 1 exhaust port.
thoughts?
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#21
by
Jettagli16v
on 29 Oct, 2008 15:47
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This manafold (pictured)
seems to be different than mine.
I have Garrett T3 (OEM)
and I dont think I have a boss where that one was placed.
Can I use the boss for the heat shield mount (Just a little closer to the turbo flange than the one pictured)?
I am installing a spruce thermocouple (Thanks, GTD!)
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#22
by
79rabbit4dr
on 29 Oct, 2008 22:33
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Where is a good place to get these and what brand should I go for?
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#23
by
cyrus #1
on 29 Oct, 2008 22:50
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People seem to like the aircraft spruce thermocouple. It reacts quickly and is reasonably inexpensive.
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#24
by
saurkraut
on 30 Oct, 2008 05:27
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Here's the Aircraftspruce superfast probe:
Link: Aircraftspruce
And here is a VDO EGT gauge:
Link: VDO Vision EGT Gauge
You'll need the lead wire, so you can either buy the gauge with the super slow VDO probe and use the supplied lead wire.
Or contact Libbybapa and see if he is still selling bulk thermocouple lead wire.
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#25
by
rabbitman
on 30 Oct, 2008 19:05
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I have that setup and it works great!
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#26
by
monomer
on 03 Nov, 2008 15:04
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I have the AS probe and gauge just waiting to be mounted and used...
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#27
by
Smokey Eddy
on 05 Nov, 2008 00:42
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#28
by
zukgod1
on 05 Nov, 2008 07:50
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Well it says "Type R" so it must be good..