High IAT - Pull Timing or Add Fuel?? Or Both??
Thread Starter
Joined: Oct 2016
Posts: 1,584
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From: Armstrong BC
High IAT - Pull Timing or Add Fuel?? Or Both?? Hey guys what's the consensus with higher IAT temps (150+) in regards to pull timing or add fuel?? Is one better than the other?? Just curious what y'all think cause this has come up a bunch for me the last little while. The internet is drastically different from one to the other. Thanks guys have fun!
Joined: Apr 2006
Posts: 3,891
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From: Grand Rapids, Michigan
Honestly, I'd add fuel over dropping timing. Additional fuel will always have a cooling effect. Timing will kill power, but I don't see it necessarily reducing coolant temps that much. Plus with retarded timing, it puts a lot of heat into the exhaust, which is going to heat up your engine bay and make the high IATs worse. I'm assuming your IAT sensor is before your meth nozzle? I'd be curious what the temps would be like post meth nozzle. Any way to add another IAT sensor for monitoring?
Thread Starter
Joined: Oct 2016
Posts: 1,584
Likes: 374
From: Armstrong BC
Honestly, I'd add fuel over dropping timing. Additional fuel will always have a cooling effect. Timing will kill power, but I don't see it necessarily reducing coolant temps that much. Plus with retarded timing, it puts a lot of heat into the exhaust, which is going to heat up your engine bay and make the high IATs worse. I'm assuming your IAT sensor is before your meth nozzle? I'd be curious what the temps would be like post meth nozzle. Any way to add another IAT sensor for monitoring?
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Joined: Jul 2022
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From: Alaska
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Photo shows a right angle nozzle holder pass side couple inches forward of throttle body. I'd add another spray nozzle further out on opposite side.
My 5.3L @ 190kPa won't take much timing on local best available (90 octane) pump gasoline, 9 degrees from 4000 to 4400 rpm and up to 13 degrees spark above 4800 rpm.
Thread Starter
Joined: Oct 2016
Posts: 1,584
Likes: 374
From: Armstrong BC
.
..
Photo shows a right angle nozzle holder pass side couple inches forward of throttle body. I'd add another spray nozzle further out on opposite side.
My 5.3L @ 190kPa won't take much timing on local best available (90 octane) pump gasoline, 9 degrees from 4000 to 4400 rpm and up to 13 degrees spark above 4800 rpm.
..
Photo shows a right angle nozzle holder pass side couple inches forward of throttle body. I'd add another spray nozzle further out on opposite side.
My 5.3L @ 190kPa won't take much timing on local best available (90 octane) pump gasoline, 9 degrees from 4000 to 4400 rpm and up to 13 degrees spark above 4800 rpm.
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Joined: Oct 2016
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From: Armstrong BC
The intercooler is a 31x12 4" thick Mishimoto R line. I did take the car out yesterday for a rip but wasn't bothering with any logging it was just a cruise with some buddies. In the spring be doing some wiring so I'll get another IAT in there and I've got a pressure sensor for the water meth system I'm gonna send to the Dominator to monitor that as well
Hey guys what's the consensus with higher IAT temps (150+) in regards to pull timing or add fuel?? Is one better than the other?? Just curious what y'all think cause this has come up a bunch for me the last little while. The internet is drastically different from one to the other. Thanks guys have fun!
Thread Starter
Joined: Oct 2016
Posts: 1,584
Likes: 374
From: Armstrong BC
Thread Starter
Joined: Oct 2016
Posts: 1,584
Likes: 374
From: Armstrong BC
Pulling timing as intake air temps rise is the standard way of doing things, the OEMs do it that way and every computer out there has a table to do it that way. Some add fuel if it hits a certain threshold ie intercooler pump failed and temps skyrocket, but primary function is timing retard.