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Was looking at the air intake at the engine bay and wondered why porsche didn't fully seal the inlet manifold that's attached to the rear deck. Thought it would make sense to seal it keep the hot air from the engine bay from getting sucked in.
Not sure I follow. IATs are arguably more important in a turbo car than a NA car. Sucking hot air from the engine compartment is never a good idea.
The turbos compress the air and heat it. It's more imperative to have good intercoolers. I have a round K&N in the bay and see just over 10 degrees over ambient when it's sitting and really hot.
Two days ago, sitting in traffic in NYC through Manhattan, IAT was 67 degress with ambient air of 60. Not too bad. I'm not advocating that the engine still should get the best air possible, just a small temp variance isn't as big a deal on a turbo car as the air gets heated by the turbos and then the intercoolers have to cool it. It's more imperative to have good cooling post turbo IMO.
No it wouldn't. I have logged IAT every way possible including stock box, evo ms, diff filters, etc.
This was also in one of the hottest, most humid areas - South Florida.
We'll have to agree to disagree. Sucking hot air from the engine bay is a bad idea. Logging IATs in anything but a controlled environment would be wildly inaccurate due to the sheer number of variables. The odds of doing that while testing power levels are even lower.
There is a reason that OEMs make extensive design efforts to pull fresh air into the intake tract instead of slapping a cone filter on the front side of the plenum and calling it a day.
Much easier and more effecient to have an air intake system that pulls 10° cooler air pre-compression than intercoolers that provide an additional 10° of temperature reduction...
We'll have to agree to disagree. Sucking hot air from the engine bay is a bad idea. Logging IATs in anything but a controlled environment would be wildly inaccurate due to the sheer number of variables. The odds of doing that while testing power levels are even lower.
There is a reason that OEMs make extensive design efforts to pull fresh air into the intake tract instead of slapping a cone filter on the front side of the plenum and calling it a day.
Most of that reasoning is sound/emissions, NVH stuff. To each their own. But my datalogs are datalogs. There's no refuting the numbers and there's nothing wildly inaccurate. My cars been together a long time, no issues. What works for you is fine, just saying it's not the bible.
Sucking warm air/hot air vs directly from a "cooler" outside ambient source will suck power. The Motronic ECU will cut timing in 3 degree increments once the MAP/TEMP sensor reaches each "limit"
So if you start with a high intake temp you are closer to the limiter vs the cooler delta when drawing cool air. The heat load on your intercoolers will be LESS.. I have tested the flat panel and cone INSIDE engine bay panels which ingest hot air and can log on average 4 to 6 degrees of timing being pulled.
And yes one can install water injection, intercoolers the size of filing cabinets, to overcome the higher temp delta.. But for most "stock" cars having a outside cold RAM air effect will make more power.
Most of that reasoning is sound/emissions, NVH stuff. To each their own. But my datalogs are datalogs. There's no refuting the numbers and there's nothing wildly inaccurate. My cars been together a long time, no issues. What works for you is fine, just saying it's not the bible.
Unfortunately, data loggers (and sensors) can be wrong or improperly calibrated so NO not all "data" is created equally. I do believe the colder the air intake the better. My car runs much better in the cold. This is why I added a 2nd "snorkel" too....although the 2nd 1 is sealed.
Sucking warm air/hot air vs directly from a "cooler" outside ambient source will suck power. The Motronic ECU will cut timing in 3 degree increments once the MAP/TEMP sensor reaches each "limit"
So if you start with a high intake temp you are closer to the limiter vs the cooler delta when drawing cool air. The heat load on your intercoolers will be LESS.. I have tested the flat panel and cone INSIDE engine bay panels which ingest hot air and can log on average 4 to 6 degrees of timing being pulled.
And yes one can install water injection, intercoolers the size of filing cabinets, to overcome the higher temp delta.. But for most "stock" cars having a outside cold RAM air effect will make more power.
I'm not advocating that you should try and take in the hottest air possible, naturally one should try all attempts at getting the best air to the motor. I'm saying it's just not as imperative when you have two blowers compressing and heating the air behind it.
04-22-2019, 01:13 PM
Air inlet seal
