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Forced Induction Talk about turbo and superchargers.

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Old 04-29-2006, 12:09 AM   #1 (permalink)
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pyrometer probe install location

anyone know a good place for me to mount the EGT gauge probe?
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Old 04-29-2006, 09:00 AM   #2 (permalink)
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As close to the turbo exhaust, or the collector for the rear manifold as possible.
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Old 05-01-2006, 05:02 PM   #3 (permalink)
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He's got a s/c. You should install it in the runners of the headers. You want an accurate reading of the temperature as it comes out of the cylinder. Placing it lower down intot he ocllector would give a more averaged out reading of all 6 cylinders, which isnt usually recommended. I'm not sure specifically if this is true for supercharged setups.
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Old 05-01-2006, 06:42 PM   #4 (permalink)
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I really ment the rear collector of the last 3 cyl. 4,5 and 6 just below the O2. But if he has headers then the dual manifolds are gone.
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Old 05-01-2006, 06:48 PM   #5 (permalink)
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No he doesnt have headers. I used the term very loosely (and wrong) when I said that. Thinkign about the exhaust manifolds I supposed since the stock manifold is short you could place it at the collector of 3 cylinders, but it's still considered averaged out. Try and place it in one of the runners.
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Old 05-01-2006, 07:00 PM   #6 (permalink)
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some say cylinder 1 some say 6. explain why 6 guys?
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Old 05-01-2006, 07:40 PM   #7 (permalink)
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Cylinder 6 has a shorter run to the downpipe. I'd do cylinder 6.
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Old 05-01-2006, 07:43 PM   #8 (permalink)
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Cylinder 6 has a shorter run to the downpipe. I'd do cylinder 6.
I'd agree with this statement about doing cylinder 6.
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Old 05-01-2006, 11:01 PM   #9 (permalink)
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my gauge goes to 1600, i dont think im gonna see temps that high will i? also would it be that bad to run it at the downpipe? im not sure the what the loss will be that far off the head, but will it be small enough that i would be able to confident on it being there?
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Old 05-02-2006, 12:04 AM   #10 (permalink)
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You could very well see temps as high as 1600, ESPECIALLY if you put it in the collectors at the end of your stock exhaust manifolds. Even on a supercharger you'll see 1600 when you run at WOT.

Are you doing a downpipe? Were you planning on upgrading your exhaust manifold into headers which lead into a down pipe? If you do and put the EGT gauge there you'll see a large averaged out rise in temperature.

If you put it in a runner from one of the cylinders you will get an accurate representation of how lean you might be running on that one cylidner. That's teh downside. But the downside of puttign it ina collector liek adownpipe is that you will have 6 runners, adn if one cylinder begins ot run lean you won't see much change in the EGT and thus really defeat the purpose of the EGT.

The reason you will see lower temperature if you put it in a runner instead of the collector is because a runner comes from one cylinder. Obviously we all have four-stroke engines, thus we have one stroke of exhaust release and 3 strokes where the ehxaust valve is closed. So everytime we have one cycle your runner is goign through one pulse of hot exhaust and 3 counts of cool down until the next exhaust stroke.
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Old 05-02-2006, 12:07 AM   #11 (permalink)
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I'm goign to copy my post i just made on bf.c for this topic just as reference to anyone who might find this topic later.

Background: Cameron, another member, stated his tuner told him to put his two EGT probes in his cylinder 1 and cylinder 5 runners to get the best readings.

"I realized why your tuner said runner 5 instead of runners 2, 3, and 4. It's because all our engines are four stroke cycles. So in sequence each cylinder would be at a different stage.

Example at random time:
Cylinder 1: exhaust stroke
Cylinder 2: intake stroke
Cylinder 3: compression stroke
Cylinder 4: combustion stroke
Cylinder 5: exhaust stroke
Cylinder 6: intake stroke

But now we have to consider that Cylinder 1 has the longest runner, correct? Come to think of it since stock exhaust manifolds (Furious has a supercharger) are two manifolds, which runner is the longest and which is the shortest? Cylinder 6 is the shortest in his case right? And Cylinder 1 is the longest?

And in Cameron's case, because he has a top mount turbo and his turbo manifold is reversed, Cylinder 1 is the shortest runner, and cylinder 6 is the longest, so it would be advantageous for Cameron to have his EGT probes in the cylinder 1 runner and his 2nd probe in cylinder 5 since both are on the same stroke.
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Old 05-02-2006, 12:16 AM   #12 (permalink)
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Quote:
Originally Posted by ///M Power
I'm goign to copy my post i just made on bf.c for this topic just as reference to anyone who might find this topic later.

Background: Cameron, another member, stated his tuner told him to put his two EGT probes in his cylinder 1 and cylinder 5 runners to get the best readings.

"I realized why your tuner said runner 5 instead of runners 2, 3, and 4. It's because all our engines are four stroke cycles. So in sequence each cylinder would be at a different stage.

Example at random time:
Cylinder 1: exhaust stroke
Cylinder 2: intake stroke
Cylinder 3: compression stroke
Cylinder 4: combustion stroke
Cylinder 5: exhaust stroke
Cylinder 6: intake stroke

But now we have to consider that Cylinder 1 has the longest runner, correct? Come to think of it since stock exhaust manifolds (Furious has a supercharger) are two manifolds, which runner is the longest and which is the shortest? Cylinder 6 is the shortest in his case right? And Cylinder 1 is the longest?

And in Cameron's case, because he has a top mount turbo and his turbo manifold is reversed, Cylinder 1 is the shortest runner, and cylinder 6 is the longest, so it would be advantageous for Cameron to have his EGT probes in the cylinder 1 runner and his 2nd probe in cylinder 5 since both are on the same stroke.


Just a curious question.... isnt there one cylinder thats going to run hotter than all the others? How much of a temp difference on each cylinder is one going to see? I would probably find the hottest cylinder.( if there is one). I learned that from expirience from my other cars, the #6 cylinder is the hottest due to the fact that the EGR gasses gets re routed into that cylinder. So thats why technically we would do an EGR block off plate. But to this day i dont see any significance in the long run , so i dont know. I dont know, im just speculating, since im curious of what you guys come up with.
Any way i would love to know what Eric and Marvin has come up with, since im curious.
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Old 05-02-2006, 12:36 AM   #13 (permalink)
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Yeah funny you mention that. I could never find out if e36m3's even utilize EGR. I've just never heard the term before associated with e36 m3's. I know it exists in many older bimmers but everytime I asked I never got a response.

I completely forgot about that concept until you posted about it. Up until now I dont know which cylinder gets the extra gases, or even if our engines utilize internal or external EGR. Being a BMW owner who really never hears the term I couldn't even tell you whether one method of EGR is outdated or not.
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Old 05-02-2006, 12:44 AM   #14 (permalink)
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Yeah funny you mention that. I could never find out if e36m3's even utilize EGR. I've just never heard the term before associated with e36 m3's. I know it exists in many older bimmers but everytime I asked I never got a response.

I completely forgot about that concept until you posted about it. Up until now I dont know which cylinder gets the extra gases, or even if our engines utilize internal or external EGR. Being a BMW owner who really never hears the term I couldn't even tell you whether one method of EGR is outdated or not.
Cool, i just thoght since our cars were MY95 , i thought they would have the older way. But i would still like someone to figure out which cylinder is hotter.
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Old 05-02-2006, 12:59 AM   #15 (permalink)
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hmm good read guys so #6 it is, and yes in the future i plan on going to a set of long headers.
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