When are the IATs to high for FI??
Great question.....hard to answer. Need more octane to "help" offset high AIT's. Combo related also....different combos will tolerate different temps. For me 170 was the cutoff, then I went to meth and dropped it down since the turbos were killing the IC's.
Yes great question...
My IAT's jump up a good 70 deg above Amb temps with a good 10 second pull with 15psi of boost from my 3" twin intercoolers from ATI... These things hardly do anything at 700rwhp..
Now I have meth, I know it helps as I get no KR and the car runs smoother. No dyno numbers yet and dont know how much the meth helps with the IAT's as my sensor is before the meth spray..
Hope this help..
Clint
My IAT's jump up a good 70 deg above Amb temps with a good 10 second pull with 15psi of boost from my 3" twin intercoolers from ATI... These things hardly do anything at 700rwhp..
Now I have meth, I know it helps as I get no KR and the car runs smoother. No dyno numbers yet and dont know how much the meth helps with the IAT's as my sensor is before the meth spray..
Hope this help..
Clint
I don't like anything over 150.
Meth fixes that though. I can see an initial temp drop of 60 degrees and always ends up below ambient. The hotter it is the better the meth cools.
Meth fixes that though. I can see an initial temp drop of 60 degrees and always ends up below ambient. The hotter it is the better the meth cools.
Originally Posted by HUGGER ORANGE SS
Yes great question...
My IAT's jump up a good 70 deg above Amb temps with a good 10 second pull with 15psi of boost from my 3" twin intercoolers from ATI... These things hardly do anything at 700rwhp..
Now I have meth, I know it helps as I get no KR and the car runs smoother. No dyno numbers yet and dont know how much the meth helps with the IAT's as my sensor is before the meth spray..
Hope this help..
Clint
My IAT's jump up a good 70 deg above Amb temps with a good 10 second pull with 15psi of boost from my 3" twin intercoolers from ATI... These things hardly do anything at 700rwhp..
Now I have meth, I know it helps as I get no KR and the car runs smoother. No dyno numbers yet and dont know how much the meth helps with the IAT's as my sensor is before the meth spray..
Hope this help..
Clint
From an article that was in a GM Hi Tech magazine. Bob
"Ryan compiled the raw data into these convenient graphs and as you can see there was approximately .5 psi less of boost drop off from the larger intercoolers. In addition the larger intercoolers were 10 percent more effective in cooling the intake air temperature, especially in the upper rpm range.... "
"...At 6500 rpm intake air temperatures were only 62 degrees with the 4.5-inch intercoolers, meanwhile, with the smaller units, intake air was at 71 degrees. As you can see from the graph, as rpm and boost increased so did the disparity between the two intercoolers, proving the potential with higher boost levels."
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on my old turbotech street kit with the intercooler near the radiator my IATs got up to 200* on a 100* day, that bothered me, i would like to see them no higher then 170* on a very hot day, but would prefer the low 150 range at that ambient
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This may sound really stupid put how are you guys measuring your IAT's???
I am doing a 4inch thick OBX intercooler on a Open front Bumper pushing roughly 650-700RWHP on a D1SC (15lbs or so) and I am wondering what my IAT's would be?
I am doing a 4inch thick OBX intercooler on a Open front Bumper pushing roughly 650-700RWHP on a D1SC (15lbs or so) and I am wondering what my IAT's would be?
Logging the IAT sensor is a good start 
Mine will get up to 150 on a 90 degree day at the end of the 1/4 with the 4" OBX and D1SC, thats the highest I have seen. Pretty much it will always rise 40-45 degrees on a pass, if I leave the line at 75 it will go to 115, 110 and it will go up to 150 etc. Thats acceptable to me.
Mine will get up to 150 on a 90 degree day at the end of the 1/4 with the 4" OBX and D1SC, thats the highest I have seen. Pretty much it will always rise 40-45 degrees on a pass, if I leave the line at 75 it will go to 115, 110 and it will go up to 150 etc. Thats acceptable to me.
Originally Posted by ABeasst
At what point should you start to worry about how high the IATs are? What range of IATs do you guys run in??
Originally Posted by Exotic Performance Plus
Clint, you should jump up to the thicker 4.5" intercoolers.
From an article that was in a GM Hi Tech magazine. Bob
"Ryan compiled the raw data into these convenient graphs and as you can see there was approximately .5 psi less of boost drop off from the larger intercoolers. In addition the larger intercoolers were 10 percent more effective in cooling the intake air temperature, especially in the upper rpm range.... "
"...At 6500 rpm intake air temperatures were only 62 degrees with the 4.5-inch intercoolers, meanwhile, with the smaller units, intake air was at 71 degrees. As you can see from the graph, as rpm and boost increased so did the disparity between the two intercoolers, proving the potential with higher boost levels."
From an article that was in a GM Hi Tech magazine. Bob
"Ryan compiled the raw data into these convenient graphs and as you can see there was approximately .5 psi less of boost drop off from the larger intercoolers. In addition the larger intercoolers were 10 percent more effective in cooling the intake air temperature, especially in the upper rpm range.... "
"...At 6500 rpm intake air temperatures were only 62 degrees with the 4.5-inch intercoolers, meanwhile, with the smaller units, intake air was at 71 degrees. As you can see from the graph, as rpm and boost increased so did the disparity between the two intercoolers, proving the potential with higher boost levels."
Thx BOB... Naw I'm planning on just going to a Front Mount... I've seen you're kit, it's very nice, but I'm thinking I would like to to my own with a single inlet/Duel outlet for the intercooler so I can have the piping Y in just brfore the TB. Kinda like Imtimadat8 97 LT1 setup.. I think that would look great under my hood.. + a 10% better difference on the 4.5 intercoolers, just not good enough compared to a front mount..
CLint
Joined: Jun 2004
Posts: 1,501
Likes: 7
From: Ft. Irwin, California (But Virginia is home)
On "stock" tune the PCM will begin pulling timing as low as 100 degrees. I was seeing 130-135 on my STS at 5PSI before adding an intercooler. After the FMIC, the highest I've noted is 105. That was during some non-stop full boost runs over a period of 20 minutes.
I set the parameters on the PCM to aviod retarding timing until 110 degrees. High boost will create more heat, but even so I'd call anything above 130 a bad thing. Just my $0.02
I set the parameters on the PCM to aviod retarding timing until 110 degrees. High boost will create more heat, but even so I'd call anything above 130 a bad thing. Just my $0.02
