Relation between IAT's & AFR
11-22-2010, 04:47 PM
#2
IAT is your air intake temp and has noting to do with AFR. Richer is usually cooler to a point then it will start to get hotter. Lean will usually get hotter also. Its a wierd deal but that is just the way it is. This is only for gasoline power. Diesel power will only get hotter the richer it is and cooler the leaner it is.
11-22-2010, 04:56 PM
#3
IAT is your air intake temp and has noting to do with AFR. Richer is usually cooler to a point then it will start to get hotter. Lean will usually get hotter also. Its a wierd deal but that is just the way it is. This is only for gasoline power. Diesel power will only get hotter the richer it is and cooler the leaner it is.
11-22-2010, 05:00 PM
#4
I told ya too rich or too lean. They both can get hot. I know it doesnt make much sense to me either but Ive seen what too lean did to my piston. Lets just say it wasn't a dished piston anymore.
Last edited by TurboBuick6; 11-22-2010 at 06:14 PM.
11-22-2010, 05:24 PM
#5
Richening will lower EGT to a point, I have seen around 10.6 the fuel mass is too great to burn fully in the chamber and the flame carries over into the port and header, thus raising EGT from that point and drastically so.
Leaning generally raises EGTquickly from 13.0-14.0, then it tapers off quite a bit. When you are going into lean burn for cruise and get over 16.5 it starts to cool alot
11-22-2010, 08:42 PM
#6
then the title of your thread should read "relation of EGT to AFR". Fix it or you will get the same answer
Richening will lower EGT to a point, I have seen around 10.6 the fuel mass is too great to burn fully in the chamber and the flame carries over into the port and header, thus raising EGT from that point and drastically so.
Leaning generally raises EGTquickly from 13.0-14.0, then it tapers off quite a bit. When you are going into lean burn for cruise and get over 16.5 it starts to cool alot
Richening will lower EGT to a point, I have seen around 10.6 the fuel mass is too great to burn fully in the chamber and the flame carries over into the port and header, thus raising EGT from that point and drastically so.
Leaning generally raises EGTquickly from 13.0-14.0, then it tapers off quite a bit. When you are going into lean burn for cruise and get over 16.5 it starts to cool alot
So according to your post I guessed right and I'm in a sense "2 stepping it " down the track, lol. Thanks for the post & the info.
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11-22-2010, 10:39 PM
#8
I'm not looking at water/meth as an option, just not a big fan of that.
11-22-2010, 10:45 PM
#9
IAT and AFR are barely connected. the amount of heat transferred across the turbo is fairly constant and i would doubt a change in AFR would make more than 5* of a difference. Also you are only running 130mph traps, that turbo should still be pretty efficient at that point, depending on your weight of course. Odds are your IC is getting plugged, or there is a leak somewhere on the cold side that is raising your IAT.
11-22-2010, 10:54 PM
#10
IAT and AFR are barely connected. the amount of heat transferred across the turbo is fairly constant and i would doubt a change in AFR would make more than 5* of a difference. Also you are only running 130mph traps, that turbo should still be pretty efficient at that point, depending on your weight of course. Odds are your IC is getting plugged, or there is a leak somewhere on the cold side that is raising your IAT.
Last edited by WS6HUMMER; 11-22-2010 at 10:59 PM.
11-22-2010, 11:05 PM
#11
just like anything else, getting dirt and **** in the front making it less efficient. also turbos will leak a little bit of oil as a part of their nature, and i take IC off yearly and wash it out with alcohol to get the oil film off it. That has been worth about 10* every time i do it.
My cars would always pick up 2-3mph with a good cooldown as well, but would pick up another 2-4mph with cool air in the evening. If you havent for awhile, or ever, rinse out the IC and pipes and see what happens
My cars would always pick up 2-3mph with a good cooldown as well, but would pick up another 2-4mph with cool air in the evening. If you havent for awhile, or ever, rinse out the IC and pipes and see what happens
11-22-2010, 11:06 PM
#12
If you have an ebay cooler you need to get rid of it and get a nice quality intercooler. If all else fails water to air always wins lol.
158* is hottt! I see maybe just over 100 in a pull through 4th gear stock turbo and intercooler on my neon at 15 lbs of boost. Now this is in 60* weather though too.
158* is hottt! I see maybe just over 100 in a pull through 4th gear stock turbo and intercooler on my neon at 15 lbs of boost. Now this is in 60* weather though too.
11-22-2010, 11:22 PM
#13
just like anything else, getting dirt and **** in the front making it less efficient. also turbos will leak a little bit of oil as a part of their nature, and i take IC off yearly and wash it out with alcohol to get the oil film off it. That has been worth about 10* every time i do it.
My cars would always pick up 2-3mph with a good cooldown as well, but would pick up another 2-4mph with cool air in the evening. If you havent for awhile, or ever, rinse out the IC and pipes and see what happens
My cars would always pick up 2-3mph with a good cooldown as well, but would pick up another 2-4mph with cool air in the evening. If you havent for awhile, or ever, rinse out the IC and pipes and see what happens
If you have an ebay cooler you need to get rid of it and get a nice quality intercooler. If all else fails water to air always wins lol.
158* is hottt! I see maybe just over 100 in a pull through 4th gear stock turbo and intercooler on my neon at 15 lbs of boost. Now this is in 60* weather though too.
158* is hottt! I see maybe just over 100 in a pull through 4th gear stock turbo and intercooler on my neon at 15 lbs of boost. Now this is in 60* weather though too.
On your Neon, did you ever log the IAT going down the track? Mine stays below 100 street driving, it only gets really hot when I'm under a lot of boost for a long time.
11-23-2010, 07:29 AM
#15
My IAT's were logged on a WOT run from 70 to 130 MPH on the HWY. About topped out 4th gear.
You either need to spend big money on an intercooler or get a meth kit. If you don't want meth you definitely need an intercooler.
You either need to spend big money on an intercooler or get a meth kit. If you don't want meth you definitely need an intercooler.
11-23-2010, 07:40 AM
#16
Probably gonna shell out some cash for a quality intercooler, I wonder if the AR of my turbo would have anything to do with it super heating the air like Grr posted?
11-23-2010, 09:39 AM
#17
Hey man, havent seen you on here in a while, work keeping you busy?
Yeah I was on a patrol. No communication with the world
Probably gonna shell out some cash for a quality intercooler, I wonder if the AR of my turbo would have anything to do with it super heating the air like Grr posted?
Yeah I was on a patrol. No communication with the world
Probably gonna shell out some cash for a quality intercooler, I wonder if the AR of my turbo would have anything to do with it super heating the air like Grr posted?
