Are there any HP gain from Evo Intake???
04-17-2003, 05:52 PM
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You're sucking in HOT air from the engine compartment
Unless you route the intake tube down next to the foglights, but let me tell you it's scary when you check your filter and its soaking wet.
Mike
Mike
04-17-2003, 06:01 PM
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Sorry, but I spent months trying to develop one myself, and I know first hand they are a waste
of money.
The evo design is poor because 1) you are screwing with the intake tract and 2) you are sucking in hot air.
The only way I was able to see any gains is by routing the intake down by the foglight. As I pointed out below, this is VERY scary when you reach down and find your filter completely soaked. What I did find was that torque was improved, but HP was roughly the same.
Still, there were no gains from a short air intake. The engine felt slightly more responsive, which is why this is such a heated issue. People <i>feel</i> like it's faster than it actually is. And in many cases the engine will heat soak quicker, or as the people on the B5 forum found out, you'll run rich.
Mike
The evo design is poor because 1) you are screwing with the intake tract and 2) you are sucking in hot air.
The only way I was able to see any gains is by routing the intake down by the foglight. As I pointed out below, this is VERY scary when you reach down and find your filter completely soaked. What I did find was that torque was improved, but HP was roughly the same.
Still, there were no gains from a short air intake. The engine felt slightly more responsive, which is why this is such a heated issue. People <i>feel</i> like it's faster than it actually is. And in many cases the engine will heat soak quicker, or as the people on the B5 forum found out, you'll run rich.
Mike
04-17-2003, 06:06 PM
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Show me a dyno WITH gains and we can talk
An engine is an air compressor. In their two most basic forms, you can increase HP by either allowing more air to flow through the engine, or to increase the density of the air. An intake for a 1.8T will do neither. The stock airbox is very well capable enough as it is also being utilized for the S4 with it's extra liter of displacement. You are also sucking in hot air, unless you go the route I mentioned in the other posts which also has it's limitations.
Sorry, but I think it's odd that the fans of the CAI always ask for dyno plots, ignoring that they don't have one either and completely dismiss airflow data like I showed you, which is VERY important in making HP. As you could see a KN panel filter is flowing more air at higher RPMS.
Mike
Sorry, but I think it's odd that the fans of the CAI always ask for dyno plots, ignoring that they don't have one either and completely dismiss airflow data like I showed you, which is VERY important in making HP. As you could see a KN panel filter is flowing more air at higher RPMS.
Mike
04-17-2003, 06:58 PM
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Because they are naturally aspirated
First off, here is an intake for a 330 from ECIS.
<img src="http://www.ecisbmw.com/product_files/intakes/330_1.jpg">
Now on to the EvoMS.
<img src="http://www.evoms.com/a4%2018t25.jpg">
First thing you'll notice is the sharp bend with the EvoMS intake. Then you can clearly see how much more clearance there is with the 330.
Now to the heating side of the equation. The ECIS intake for the 330 is fully sealed against the hood. The 1.8T has a panel, but obviously allows hot air to enter the intake.
There are a few other reasons why an intake will make a difference with a NA engine but not a FI. A NA engine is more sensitive to air flow because the distance between the filter and head is much shorter than say, a 1.8T. With the 1.8T you have intake plumbing to the IC, then the turbo and finally to the head. Any positive flow will be disrupted far before it reaches the head. An intake will help if you are making more HP than the airbox can handle. The stock airbox should do well up to around 300HP. You will preferably need an intake tuned into the ECU, which unless you go for the PES T28 upgrade, it is not. And as I said before, it will help if you are able to route it to a source of cold air, but then you have issues with water and possible hydrolock.
Mike
<img src="http://www.ecisbmw.com/product_files/intakes/330_1.jpg">
Now on to the EvoMS.
<img src="http://www.evoms.com/a4%2018t25.jpg">
First thing you'll notice is the sharp bend with the EvoMS intake. Then you can clearly see how much more clearance there is with the 330.
Now to the heating side of the equation. The ECIS intake for the 330 is fully sealed against the hood. The 1.8T has a panel, but obviously allows hot air to enter the intake.
There are a few other reasons why an intake will make a difference with a NA engine but not a FI. A NA engine is more sensitive to air flow because the distance between the filter and head is much shorter than say, a 1.8T. With the 1.8T you have intake plumbing to the IC, then the turbo and finally to the head. Any positive flow will be disrupted far before it reaches the head. An intake will help if you are making more HP than the airbox can handle. The stock airbox should do well up to around 300HP. You will preferably need an intake tuned into the ECU, which unless you go for the PES T28 upgrade, it is not. And as I said before, it will help if you are able to route it to a source of cold air, but then you have issues with water and possible hydrolock.
Mike
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