Need help getting IAT under control
Thread Starter
Safety Car
Joined: Jun 2004
Posts: 4,353
Likes: 22
From: Bella Vista Ca
Need help getting IAT under control
I’m having issues keeping my IAT numbers down. At the drag strip my last run I saw IAT go from 100 to 172. I’m running an Alky control kit with 100% meth. I have 3 nozzles, a 3 prior to the super charger, a 15 at the outlet of my intercooler, and a 10 8” from that one. The IAT sensor was just replaced and it is about 14” away from the last nozzle. I logged meth pressure of a little over 100lbs for the entire run. Nothing is clogged (I checked). Meth is set to start at about 3 lbs and max flow is at about 10lbs of boost. I have the gain turned all the way up too.
Engine is a 427 with an A&A YSi kit putting out 20-21lbs of boost. I’m running the standard A&A intercooler.
Anyone with real world experience on how to get the IAT temps down. Should I go to a 50/50 mix with water? Is a bigger intercooler going to make notable improvements?
Engine is a 427 with an A&A YSi kit putting out 20-21lbs of boost. I’m running the standard A&A intercooler.
Anyone with real world experience on how to get the IAT temps down. Should I go to a 50/50 mix with water? Is a bigger intercooler going to make notable improvements?
Thread Starter
Safety Car
Joined: Jun 2004
Posts: 4,353
Likes: 22
From: Bella Vista Ca
The ambient was in the mid 70s.
Timing was being pulled at the end of the run due to the IATs and I did get knock retard at the very end too.
Thread Starter
Safety Car
Joined: Jun 2004
Posts: 4,353
Likes: 22
From: Bella Vista Ca
Melting Slicks
Joined: Feb 2006
Posts: 2,163
Likes: 5
From: Houston
It's just the way it works. I guess the other option is a bigger intercooler. Otherwise you just keep the timing out and take the power loss. Could be worse. It's not a KB...lol
Melting Slicks
Joined: Nov 2007
Posts: 2,144
Likes: 2
From: Conway AR
Mike I would say something is out of wack. I am running same amount of boost and last pass in the quarter iats were below ambient. I have the latest a and a system also. A 15 and 10 nozzle for Meth.
Last edited by Z06wanted; Nov 13, 2011 at 05:30 PM.
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jobberone
Joined: Aug 2003
Posts: 2,062
Likes: 8
From: Kailua Kona HI
I agree with the 15. What were ambient temps? Just how much meth are you using? You should be spraying a good bit. What % meth are you tuned for at WOT? How much fuel are you pulling? Is that temp after one run or are you hot lapping? I know you've looked but make sure the intercooler is clean.
Thread Starter
Safety Car
Joined: Jun 2004
Posts: 4,353
Likes: 22
From: Bella Vista Ca
I agree with the 15. What were ambient temps? Just how much meth are you using? You should be spraying a good bit. What % meth are you tuned for at WOT? How much fuel are you pulling? Is that temp after one run or are you hot lapping? I know you've looked but make sure the intercooler is clean.
The temps I saw were from a single run, just some idling in staging.
I'll take another look at the IAT sensor, I figured changing it with a new one would be good enough. I've heard several people drop below ambient running in the 1/4.
Last edited by Mike04; Nov 13, 2011 at 08:43 PM.
Thread Starter
Safety Car
Joined: Jun 2004
Posts: 4,353
Likes: 22
From: Bella Vista Ca
jobberone
Joined: Aug 2003
Posts: 2,062
Likes: 8
From: Kailua Kona HI
Ambient was in the mid 70s. The tune is with 100% meth (lots of fuel is pulled from the VE table). With the 3, 10, and 15 nozzle that should be close to 18 GPH at 100psi.
The temps I saw were from a single run, just some idling in staging.
I'll take another look at the IAT sensor, I figured changing it with a new one would be good enough. I've heard several people drop below ambient running in the 1/4.
The temps I saw were from a single run, just some idling in staging.
I'll take another look at the IAT sensor, I figured changing it with a new one would be good enough. I've heard several people drop below ambient running in the 1/4.
Thread Starter
Safety Car
Joined: Jun 2004
Posts: 4,353
Likes: 22
From: Bella Vista Ca
Here is my current VE table (scaled about 85%). The meth looks to be flowing a lot. 
I'll look into the sensor at the higher temps. It works great around town and on the dyno I also saw an increase, 80 to 117 on a pull.
I'll look into the sensor at the higher temps. It works great around town and on the dyno I also saw an increase, 80 to 117 on a pull.
Former Vendor
Joined: Jul 2010
Posts: 4,504
Likes: 4
From: Waterloo Ontario
You have your meth set up wrong. If your making 20 lbs, the meth should start spraying at around 6-8 lbs and have it spraying full at 18 lbs.
You'll need to adjust the settings in your pac controller. If your still on a 2 bar map that comes with the meth-upgrade to the 2.5 bar.
You'll need to adjust the settings in your pac controller. If your still on a 2 bar map that comes with the meth-upgrade to the 2.5 bar.
Thread Starter
Safety Car
Joined: Jun 2004
Posts: 4,353
Likes: 22
From: Bella Vista Ca
You have your meth set up wrong. If your making 20 lbs, the meth should start spraying at around 6-8 lbs and have it spraying full at 18 lbs.
You'll need to adjust the settings in your pac controller. If your still on a 2 bar map that comes with the meth-upgrade to the 2.5 bar.
You'll need to adjust the settings in your pac controller. If your still on a 2 bar map that comes with the meth-upgrade to the 2.5 bar.
I'm running the controller off a 3 bar
Tech Contributor
Joined: Apr 2007
Posts: 10,924
Likes: 78
From: Forney Texas
Who installed the methanol kit? I am concerned with the pump not getting a sufficient current supply, causing the voltage to drop. When I install the Alky kits, I run a "soak" test, running them wide open and at variousl levels of input pressures on the MAP to verify stable pressure. I do this for a few minutes to make sure it doesn't fall off for any reason. It just sounds like the meth kit may have a problem.
Thread Starter
Safety Car
Joined: Jun 2004
Posts: 4,353
Likes: 22
From: Bella Vista Ca
Who installed the methanol kit? I am concerned with the pump not getting a sufficient current supply, causing the voltage to drop. When I install the Alky kits, I run a "soak" test, running them wide open and at variousl levels of input pressures on the MAP to verify stable pressure. I do this for a few minutes to make sure it doesn't fall off for any reason. It just sounds like the meth kit may have a problem.
Last year I logged about 135-140 lbs of pressure (didn't have the M3 nozzle installed) and my IAT went from 82 to 158 with about 12.6 voltage. That was with an old IAT sensor
Wish I had a flow meter installed too....
