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Discussion Starter · #1 ·
As some may have noticed, I've been pushing the idea that the MS6/3 are dynoing lower than they should b/c people don't make an effort to get cooling air through the TMIC. Most of the time there's just a single big fan out front with the hood open. This is fine for N/A and FMIC engines, but it's just blowing air across the TMIC. Anyway this is an interesting follow up response to a question I posted on Automobilemag.com about their neglecting to send any air through the TMIC:

An update on the TMIC cooling thing...

Mazda contacted us said that they've managed to get repeatable 242 whp and 282lb-ft out of their cars by using a ($1000) 50-mph fan blowing on the front of their cars, and a powerful house fan bungee-tied to the top-mount. Ouch, that's a lot of power!

The product development engineer who gave me those numbers knows his stuff... enough so to admit that the GTI's intercooler also wasn't getting the air-flow that it would at high speeds.

Again, our goal wasn't to get peak numbers, just to look at how differently the cars made their power.

Of course, I'll be curious to see how much MS3 buyers can get their cars to put down when they resort to all the old tricks - icing the intake plumbing, spraying water on the intercooler, etc. But that certainly wasn't our goal here!

Jason


And my response:

Excellent stuff. Thanks for following up with Mazda. And while I appreciate what you're saying about advantages and all, it seems to me that you gave the GTi an advantage since the fan was at least blowing through its IC instead of over it. A $1000 50 mph fan is not crazy expensive or crazy powerful and how powerful could a house fan be? My point is that this is not trickery to get max peak numbers. It's just trying to approximate real-world airflow as much as possible. I'll definitely run my first dyno with a box fan bungeed on the TMIC.

Again, I appreciate your efforts to delve into the totally different ways the GTi, Si, MS3 engines make power. Whenever, I step on the gas in my MS3, I think I made the right choice, but can easily understand how others will find that the GTi or Si do a better job for them.


I'm sure that the Mazda figures represent the absolute maximum possible in ideal conditions. Everyone else will fall short of that, but it shows that we should be using this setup when we do our own dynos. We need to get the shops to use more than just a single fan up front since this will not accurately reflect real world conditions for a TMIC engine.

Flame away, you guys are the experts. I just try to sift through what different experts say and see what shakes out.
 

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huh...this is news? When I got my car dynoed a couple months ago, the dyno operator who deals with primarily evo's and STI's strapped a custom fan he made for STI's to the top mount. Basically it is a huge fan, with a long flexible dryer hose attached to it, with a wide opening that is bungee corded to the top mount. I did get better numbers than most with my dyno at the time too. Of course you need to cool the intercooler on a turbo car, otherwise it heatsoaks very rapidly with no airflow. Here is the link:


http://forum.mazda6club.com/index.php?showtopic=58212
 

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Discussion Starter · #4 ·
huh...this is news? When I got my car dynoed a couple months ago, the dyno operator who deals with primarily evo's and STI's strapped a custom fan he made for STI's to the top mount. Basically it is a huge fan, with a long flexible dryer hose attached to it, with a wide opening that is bungee corded to the top mount. I did get better numbers than most with my dyno at the time too. Of course you need to cool the intercooler on a turbo car, otherwise it heatsoaks very rapidly with no airflow. Here is the link:
http://forum.mazda6club.com/index.php?showtopic=58212
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Surprisingly, this IS news to a lot of people. As you can see Automobile's dyno shop didn't do it, perhaps intentionally to avoid giving an "advantage" to the MS3. And of those couple of people who responded to a poll I posted a month or so ago none had a fan on the TMIC. One guy thought it wouldn't make a difference, anyway. I think it's standard procedure not to. In Australia, it seems they close the hood or use a device like your guy did. You two now make a total of maybe 4 MS6 owners that I can recall who had air going directly to the TMIC.

You're absolutely right! Of course you need to cool the intercooler on a turboed car. DIRECTLY, and not just with a big fan up front blowing air over it.
 
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