Boost vs EGT's
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Posting Guru
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From: Grass Valley, CA
Boost vs EGT's
Hey guys,
Maybe i'm just a bit "slow", but it seems to me that the more air you get in the chamber, the lower the EGT's. Is this thought correct? What all are the major factors in EGT's?
Maybe i'm just a bit "slow", but it seems to me that the more air you get in the chamber, the lower the EGT's. Is this thought correct? What all are the major factors in EGT's?
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theoretically, the more air you can pack into the cylinder and the least amount of restriction on the exhaust side, the lower the EGT's.
EGT's are a product of combustion. the less efficient combustion and exhaust flow, the higher the EGT's. the more air you pack into the cylinders, the more fuel you can pack into the cylinders. at a point, i believe lower than 14:1 air:fuel, the air cannot support the full combustion of all of that fuel. at this point you start seeing smoke and you're EGT's rise.
-Brandon
EGT's are a product of combustion. the less efficient combustion and exhaust flow, the higher the EGT's. the more air you pack into the cylinders, the more fuel you can pack into the cylinders. at a point, i believe lower than 14:1 air:fuel, the air cannot support the full combustion of all of that fuel. at this point you start seeing smoke and you're EGT's rise.
-Brandon
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From: Louisville
A simple test I have done that proves the 'more air, lower EGT' theory is pulling a load up a hill and watching the EGTs in OD. As the EGTs get to 1200, turn off the OD - the RPMs go up (moving more air) and the EGTs come down. Fun and easy! Too bad I can almost see the fuel gauge move when I rev it over 2500...
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very well could be. that number just jumped into my head. i think i remember reading somewhere they idle at something like 50:1, normally run around 20:1 and start smoking at 14:1. then again, could be having a brain fart, it is the end of finals week! ill see what i can dig up.
-Brandon
-Brandon
Post Fiend
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From: MICHIGAN
Yep, your EGT's will be at room temp. It will stop running. Either it will starve for fuel or blow the heads right off the block. 
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Logistics Pro
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Oh man not so good haha! 200+ PSI turbo anyone?-Robb
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Posting Guru
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From: Grass Valley, CA
maybe not quite that much air...
Posting Guru
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From: Ohio
A simple test I have done that proves the 'more air, lower EGT' theory is pulling a load up a hill and watching the EGTs in OD. As the EGTs get to 1200, turn off the OD - the RPMs go up (moving more air) and the EGTs come down. Fun and easy! Too bad I can almost see the fuel gauge move when I rev it over 2500...
Only partly true. Your changing the gear ratio as well. Making it easier to pull the load. Lock a block and tackle of sorts. It would be similar to pulling a load with walmart bag mod in place, then removing the bag while in motion, allowing the air to easily penetrate. You can NOT compare shifting as a more air factor.
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From: Louisville
Only partly true. Your changing the gear ratio as well. Making it easier to pull the load. Lock a block and tackle of sorts. It would be similar to pulling a load with walmart bag mod in place, then removing the bag while in motion, allowing the air to easily penetrate. You can NOT compare shifting as a more air factor.
My original example was indeed terrible.
But more importantly what is the WALMART BAG MOD?
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Posting Guru
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From: Grass Valley, CA
that's where you put a plastic wallyworld bag over your intake...
Makes lots-o-smoke...
Jim (or anyone else)
What if you had an amazing turbo setup (50 psi boost with stock injectors(just go with it i know how hard that would be))
and HEAD STUDS...
What do you think the EGT's would be full boost full fuel???
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