heat shielding the intake system

[solidONE]

Here's a log of IAT vs Ambient temps with a somewhat heat soaked stock airbox. Note this is not the type of heavy heatsoak you'd get after having beaten on you car at a track or canyons or an hour long drive. This was only after having run the engine for a few minutes bringing it up to operating temps.

http://datazap.me/u/solidone/stock-b...=0&data=1-6-10

I may take my time doing this just to get enough data on a stock airbox under more "extreme" conditions than your standard putting and punching the car around town type loads and temperatures.

[Sleepless]

On the race track the IATs stay pretty much within 10F of ambient (tested in a 15min session at a bit over 80F at the Ridge Motorsports Park). Most of the time IATs are within 5F of ambient.

[solidONE]

Originally Posted by Sleepless

On the race track the IATs stay pretty much within 10F of ambient (tested in a 15min session at a bit over 80F at the Ridge Motorsports Park). Most of the time IATs are within 5F of ambient.

That's only when it's wide open, correct? I can prove definitely that the IAT will not drop to as low as it would be when the throttle is wide open while under part throttle.

[rx3]

A higher IAT at partial throttle improves gasmileage (for example: less pumping losses, faster evaporation of gasoline and better mixing with air = faster combustion).
If more power was desired at partial throttle, then the driver can just push the throttle a little more (no need to add extra weight to the engine compartment instead).

A Low IAT is primarily desirable at WOT and this appears to be the case in stock configuration.

[solidONE]

Originally Posted by rx3

A higher IAT at partial throttle improves gasmileage (for example: less pumping losses, faster evaporation of gasoline and better mixing with air = faster combustion).
If more power was desired at partial throttle, then the driver can just push the throttle a little more (no need to add extra weight to the engine compartment instead).

A Low IAT is primarily desirable at WOT and this appears to be the case in stock configuration.

While what you said may be true, it pretty pointless (no offense) in relation to what were doing here. You could easily close the throttle if there was more power being put down than desired.

Although I suppose whether or not getting slightly lower IAT's is worth that few grams of weight increase and that hour of labor (or a couple hours if you're really anal) is subjective.

Another thing I'm trying to show is that while a few of these folks seem to insist that even with the throttle only partial open IAT's will quickly drop to same levels as while throttle wide open, it's not particularly true. Much like a lot of other stuff you see people write on these forums.

Anyhow, here's another log I took just now at about 87* ambient. Again, this is not with a heavily heat soaked box. I just ran it a few minutes before taking the log to bring it up to operating temps.
http://datazap.me/u/solidone/stock-b...mark=2511-4809

Edit: the stock tune has a stupid amount of knock running 91 octane...

[go_a_way1]

What is the point of an aftermarket "cold" air intake if stock works so good at WOT?? (Lets say with just a drop in so they can flow similar) i bet alot of guys on here have aftermarket intakes is it all a waste of money? (And some aftermarket intakes are poorly designed and pull hot air so we will ignores those for argument sakes)

[Ultramaroon]

Originally Posted by go_a_way1

What is the point of an aftermarket "cold" air intake if stock works so good at WOT?? (Lets say with just a drop in so they can flow similar)

Some people like bling and others are happy to sell it.

Originally Posted by go_a_way1

i bet alot of guys on here have aftermarket intakes is it all a waste of money? (And some aftermarket intakes are poorly designed and pull hot air so we will ignores those for argument sakes)

Yes.

[rx3]

Originally Posted by solidONE

Another thing I'm trying to show is that while a few of these folks seem to insist that even with the throttle only partial open IAT's will quickly drop to same levels as while throttle wide open, it's not particularly true.

I wouldn't claim that either.
As I said, I actually prefer the IAT to be higher at partial throttle since this has a positive effect on gas mileage.

Only at WOT I want the IAT to be low and this is already the case in stock configuration. (Due of the high air-flow at WOT there's hardly any heat transfer.)

[stevesnj]

Originally Posted by go_a_way1

What is the point of an aftermarket "cold" air intake if stock works so good at WOT?? (Lets say with just a drop in so they can flow similar) i bet alot of guys on here have aftermarket intakes is it all a waste of money? (And some aftermarket intakes are poorly designed and pull hot air so we will ignores those for argument sakes)

A higher flowing air filter is more effective than a CAI

[go_a_way1]

Well for everyone following this, after my basic tests.... This is a waste of time/money.

If anything it slightly slows the heat soaking but other then that it does nothing (Hot lava looks cool with a gold intake lol!). Temps can still get way up there. I am going to leave it on because racecar, but for anyone thinking about this dont waste your time.

[stevesnj]

Originally Posted by rx3

A higher IAT at partial throttle improves gasmileage (for example: less pumping losses, faster evaporation of gasoline and better mixing with air = faster combustion).
If more power was desired at partial throttle, then the driver can just push the throttle a little more (no need to add extra weight to the engine compartment instead).

A Low IAT is primarily desirable at WOT and this appears to be the case in stock configuration.

The lower the temperature is desirable at all times. Hotter intake charge contains less oxygen than a cooler air charge. The cooler denser the air the more oxygen it can flow to the combustion chamber. Warmer air volume takes up more space in the intake so it can't provide the same amount of oxygen as cooler air. Those tuners with the air horn intakes in the front grill are doing it right, it just looks stupid. Basically the closest to ambient air temp is ideal.

[stugray]

Originally Posted by stevesnj

The lower the temperature is desirable at all times. Hotter intake charge contains less oxygen than a cooler air charge. The cooler denser the air the more oxygen it can flow to the combustion chamber. Warmer air volume takes up more space in the intake so it can't provide the same amount of oxygen as cooler air. Those tuners with the air horn intakes in the front grill are doing it right, it just looks stupid. Basically the closest to ambient air temp is ideal.

The difference in air density at STP between 90 & 100 deg F is ~1.6%.

But since air is only ~20% oxygen, this means you are getting .3% more oxygen.


Or about the same as getting 0.050 PSI of boost.

So driving into a headwind would make a bigger difference in HP.

[Ultramaroon]

Originally Posted by stugray

The difference in air density at STP between 90 & 100 deg F is ~1.6%.

But since air is only ~20% oxygen, this means you are getting .3% more oxygen.


Or about the same as getting 0.050 PSI of boost.

So driving into a headwind would make a bigger difference in HP.

...or a lightweight crank pulley.

[chaoskaze]

I think our car probably has the crown for how many "feel good mod" there is & I'm a victim myself.

Things ppl would do to just squeeze out tiny bit more power...

It's like this meme I came across yesterday.