IAT what is considered to hot?
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Teching In
Joined: Aug 2021
Posts: 49
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From: Hardee county
IAT what is considered to hot? Hey guys looking to go purchase a procharger set up for my airboat it looks as if I’ll be going with the d1sc procharger my question when is the iat temps to hot I was just going to see about maybe running water meth and not putting a intercooler on it
TECH Fanatic
Joined: Jan 2022
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From: Seattle
You have a boat, and thus infinite cool water at your disposal as coolant for your A2W heat exchanger, why not use what's available? What are your sustained speeds? Maybe that wouldn't work for a freshwater pick up for that particular setup?
Years ago I ran a D1SC on a small block chevy, it was a blow thru setup. I had an A/A intercooler, and wanted to track my IAT's. At 18 lbs boost, I was seeing 330 degrees B4 the IC'er, around 190 after. I tried running w/o the IC'er to see how it would do, I shut it down at the 1/8 as temps were close to 270 degrees. I ran it a long time with the IC'er hooked up, never saw any problems with the 190 degrees. The carb prob helped cool things down, but I know some guys run with IAT's in the 200 range, prob closes the tuning window some, but they run E85. Spray meth would certainly help, but as said, you got a water supply, unless its salt water. If the engine is in the open, you would be getting much cooler intake air, so I would think everything would be cooler than a closed comp.
Your results may vary.
Your results may vary.
Really depends on fuel. E85 doesn't seem to care what the IAT's are. On straight pump, I don't like to see north of 150. Adding windshield washer fluid via a meth kit and I don't pay attention to IAT's anymore.
Seems more and more people are ditching the intercooler, on most setups its an often overpriced and overly heavy contraption to have on the vehicle if you aren't looking for every extra millisecond. On a typical street car I don't miss it at all, does a 1000hp street car really need another 50hp anyways?
Lots of LSA cars see over 150 on straight pump gas every day. I was driving one when IAT's hit well over 200* on 93 because both the IC pump and water meth pump took a ****, she kept on chugging. Was a fairly mild mid 600hp car, still ran 10's at well over 4,000lbs
Seems more and more people are ditching the intercooler, on most setups its an often overpriced and overly heavy contraption to have on the vehicle if you aren't looking for every extra millisecond. On a typical street car I don't miss it at all, does a 1000hp street car really need another 50hp anyways?
Seems more and more people are ditching the intercooler, on most setups its an often overpriced and overly heavy contraption to have on the vehicle if you aren't looking for every extra millisecond. On a typical street car I don't miss it at all, does a 1000hp street car really need another 50hp anyways?
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Verdad Gallardo High IAT's on straight pump are simply asking for knock unless you're neutering timing. There's no magic recipe for running high IAT's on pump gas. You either have stupid low compression, retard timing, or are dumping fuel to keep it alive. The correct answer to if a 1000hp street car needs another 50 hp is yes.....its always yes
He does and he’ll provide the data (hopefully). I’ve seen it and the sensors are nowhere near as quick as me would think they are! Not even the fast acting Rife.
I see 90-130*F after the A2A and I’m injecting wiper fluid 750cc 3ft from the TB, IAT is in the intake behind the TB and that’s at 15psi on a bone stock 150k untouched rings on 93. I would consider anything over 150-180*F high for pump. Wiper fluid will make your 93 act like 100+ and help a lot with any detonation. I see 200+ pre intercooler as I had a dual Air temp gauge for a while. Only time I would ever see 150 is sitting in traffic.
sensors are slow spray and cool as best you can and hope your giving the motor the best chance to survive especially with varying degrees of fuel quality these days.
sensors are slow spray and cool as best you can and hope your giving the motor the best chance to survive especially with varying degrees of fuel quality these days.
That's why chasing IAT blindly doesn't make much sense, especially on decent fuel. Lots of guys are hauling 100+lbs of intercooler, reservoir, pumps, lines, water, ice, etc but still aren't getting 100% traction, traction is worth more than power at that point. A 3000lb car with 1000hp and an IC runs the same MPH as a 2900lb car with 950hp with no intercooler, why so many class cars choose to ditch the intercooler as you can usually improve your short game with the weight savings.
Start low boost wise, watch plugs. Adjust tune up accordingly... then add more boost if you need/want it. No reason not to run water/meth. It's dirt cheap I’d go that route first, no reason not to. See how it does. Even if you end up with an intercooler in the end. Still no reason not to run a little shot of water/meth. IMHO a small A2W with cool water pumped in from the lake would be the most effective (cost vs performance anyway). But if its not necessary to make ya happy power wise, why bother?"
Boats are odd since they are usually wide open for long periods of time. Because of that, superchargers aren't the best choice IMO. LIttle $150 Gt45 turbo would put out the same power with ALOT more adjustability. I'd have a WG control setup like a throttle. That way you could be at high rpm cruising high speeds with little to no boost. Then add/pull boost when needed for acceleration.
Boats are odd since they are usually wide open for long periods of time. Because of that, superchargers aren't the best choice IMO. LIttle $150 Gt45 turbo would put out the same power with ALOT more adjustability. I'd have a WG control setup like a throttle. That way you could be at high rpm cruising high speeds with little to no boost. Then add/pull boost when needed for acceleration.
Its like a proper fuel table vs relying on a big closed loop correction, being ahead of the sensor works better. I meant you can get a good accurate read at "X" distance. Say stabilized at 200*. Pull the sensor away watch how long it takes to read ambient. Then put back in the same spot and see how long it takes to read 200* again. Takes a few Mississippi’s for sure! 
Exactly my point. What most of us see is old news.
True, just depends if you're an IAT weenie or not as to how much you care about it. Also depends on what ECM you are using and its polling cycle, I've seen some completely miss numerous events in the log.