Ambient Temperature Research with Force Induction

COSMO

Actually the VIS carbon hood I bought come ready so you can just move the oem hardware over to the hood and after making a few adjustments it closes nice and tight with No wiggle or play. Like I said in my first post my IAT's were about 10% more than my ambient temps so trimming the 4 inches of plastic on the stock bumper exposing more air to the intercooler and also going with a vented hood Iam down to 0 difference. And yes that is just cruising normally. I will do some more logging of stop and go to see how fast the temps rise and how long it takes for it to go back down next.... Forgot to mention the oil temps seemed to have dropped a few degrees as well with that formulation...

Boosted Performance

I wouldn't be all that concerned about IAT's at cruise, and would pay a lot more attention to them at WOT. If the system is efficient, you should not be seeing IAT's more than 15% over ambient (at about 10psi of boost). Also, my experience shows that turbine housing flow has a lot more to do with IAT's than the size of the intercooler.

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1slow370

Excuse my ignorance here but what does the turbine housing have to do with Intake air temperature, maybe the compressor housing sure i could see some effect there, but that wouldn't make much sense to me either because one would think that so long as the chosen turbo runs through it's best path through the adiabatic efficiency islands when mapped to the flow of the motor, considering that adiabatic efficiency is the percentage of wasted energy due to the act of compressing a gas compared to the ideal amount of energy it takes to compress that gas if you are traveling through the 73% island that means that 27% of the turbo's energy is being converted into friction and heat instead of pumping air so basically what i'm trying to say there is to my understanding it doesn't so much matter what the flow of the housing is so long is the turbo is correctly mapped for the application you will see the lowest possible resulting iat's from the turbo. The next question i would have regarding this is that i would agree with you in that the intercooler size does not particularly matter so long as it is more efficient than any intercooler known at shedding heat, being that we are stuck with aluminum i would say that a larger intercooler is always a better thing because even if your turbo(of course matched to the motor) was belting out charge temps near 500 degrees(i dunno like a pro turbo drag car) if your intercooler has enough surface area and an appropriate temperature delta from the cooling media (be it air in cosmo's case or a very large chest of salty-icewater in the case of our dragster)than it would be entirely possible to reduce the temps solely through intercooling down to almost ambient (or below in the case of a monster chilled turbo[or supercharged] dragster). Also 15% is a common number but there is always improvement, by my math (calculating the density of air with the pressure held constant) for every 10% increase in air temps around the 100degF mark the air will get 3% less dense so going from 15% to 5% could net you a 3% gain in power(or just prevent a 3% loss). And while checking before and after iat temps while cruising won't tell him if his intercooler will keep up at wot it is a perfectly accurate way to check to see if his modifications have had a positive or negligible effect on the efficiency of his intercooler at speed. I would think that he has done some good work and found some valuable information that will help members of the forum out, but again I'm not the expert here and i'm always wiling to learn.

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Boosted Performance

You are focusing too much on the compressor side. Remember, everything that flows out of the compressor goes in to the cobustion chamber, fuel is added and ignited. The volume of exhaust gas going out and through the turbine will be much larger than that of the compressor. If the turbine is too small, you have high back pressures, and efficiency goes down the turbe. As a result IAT's sky rocket.

If I was to use a T3 .82 a/r housing for example on the VQ37 (compressor side stays the same), there is no way any of my customers would be able to get to 500whp due flow restrictions of the turbine, increased heat (IAT's) and back pressure. Instead I use the much larger T4 1.15 a/r housings, and IAT's are never an issue because the system flows so well.

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Chuck33079

I think a lot of the need for hood pins comes from the fact that its a lot easier for the latching hardware to pull out of a fiberglass or CF hood than a metal one.

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phunk

I have had a Seibon vented "TS" hood for about 3 years and probably 40,000 miles. No hood pins, frequently visit 150+ mph. It feels real sturdy when shut, so I havent felt any need for pins.

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elperuano

All you CF hood guys park in a garage I assume right?

theDreamer

Or just paint the hood.

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COSMO

Mines is ALWAYS in the garage...

elperuano

What about getting caught in the rain? Does water get thru?

phunk

water just pours right on through my seibon TS hood vents... a few years of daily driving, and its never caused a problem. when i wash the car, soapy water just runs straight down those vents. <shrug> i see no problem with it. gotta wipe off the engine later if you care about water spots on the pipes and etc. i dont.

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Jordo!

Under these conditions, what really matters is post IC temps -- that will tell you how efficiently your IC is working.

IAT's are good to know too, but the really critical detail is the temps after cooling.

Interesting -- although that may also be due in part to the kinds of coolers being run. Are these air to air or air to water coolers?

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Chuck33079

The only FI setup I've seen here running an air to water intercooler is the Stillen kit.

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COSMO

Iam not too concerned with the rain because the hood has a fiberglass channel under the slots in hood so the water actually stay in the channel until it is diverted to the front lower section of the hood...

7419sundat

The IAT sensor is after the intercooler...