[Former_Boosted_IS]

Ok, well I promised this video so here it is. I will go into a lot more detail soon with some dyno runs, but I wanted you to see the effect the Snow Performance water/methanol kit has on IATs (Intake Air Temperatures). What you are looking at the Snow Performance Methanol flow gauge (left in ml/min x10) and the BMS Tuning Gauge (on right & set to show IAT). Notice the incredible drop in IATs once the Snow kit flows. We start at about 80F and drop below ambient through the entire pull. It is wild to see.

Now here is a log from the run. Notice the stock like timing curve on JB3 Race Gas Map 9 while running pump.

[enrita]

amazing, thanks for the video!

[Former_Boosted_IS]

Originally Posted by enrita

amazing, thanks for the video!

No problem. It is one thing to look at a log, it is another to see those IATs drop like a rock to 59F in seconds.

[Big Tom]

Where's the IAT-sensor placed?
Is it possible that the sensor is getting sprayed with the meth?

In that case; Is the IAT-value realistic?

[Former_Boosted_IS]

Originally Posted by Big Tom

Where's the IAT-sensor placed?
Is it possible that the sensor is getting sprayed with the meth?

In that case; Is the IAT-value realistic?

Think about what you are saying. If you spray water/methanol directly on a sensor, then how could it read LOWER than ambient? The fluid is sitting in the trunk, then it goes through a 220 psi fuel pump, and then sprays into the charge. At best, it could only be at ambient temperature since it is impossible for it to be colder. Think about it, leave a cup of water on the table and what will happen to the temperature? It will be ambient temperature. Methanol is a fluid just like any other and will sit at ambient. So, if anything it is probably heated through the pump, so that theory cannot make sense. In addition, it is beyond consistent so this is the real deal. If it was wet and shorting, then there would not be any consistency.

The location on the nozzle(s) is between the DV/BOV and TMAP sensor.

[marconi118]

This effect is exactly why I am looking for a flash that don't drop the boost if IAT is becoming a lot cooler than normal!

But it seems nobody can understand this!

[Big Tom]

Originally Posted by Former_Boosted_IS

Think about what you are saying. If you spray water/methanol directly on a sensor, then how could it read LOWER than ambient? The fluid is sitting in the trunk, then it goes through a 220 psi fuel pump, and then sprays into the charge. At best, it could only be at ambient temperature since it is impossible for it to be colder. Think about it, leave a cup of water on the table and what will happen to the temperature? It will be ambient temperature. Methanol is a fluid just like any other and will sit at ambient. So, if anything it is probably heated through the pump, so that theory cannot make sense. In addition, it is beyond consistent so this is the real deal. If it was wet and shorting, then there would not be any consistency.

The location on the nozzle(s) is between the DV/BOV and TMAP sensor.

So the meth nozzles are placed before the TMAP-sensor?

Sprayed alcohols, like Methanol, evaporates very quick and can actually reach lower temps than ambient.
That's the reason for my question.

[Former_Boosted_IS]

Originally Posted by Big Tom

So the meth nozzles are placed before the TMAP-sensor?

Sprayed alcohols, like Methanol, evaporates very quick and can actually reach a lower temp than ambient.
That's the reason for my question.

You really have to understand what is happening. The nozzles "mist" the fluid and it evaporates very quickly. In the case of methanol, very quickly is an understatement. When a fluid evaporates, it draws heat away from the surrounding air through the latent heat of vaporization. This drop in temperature is the heat being drawn out of the air as the liquid rapidly evaporates.

There are more running kits running nozzles in various locations and they can tell you they are seeing the exact same thing.

[GreenPlease]

Wow! Those IATs are amazing!

[RiXst3r]

Originally Posted by marconi118

This effect is exactly why I am looking for a flash that don't drop the boost if IAT is becoming a lot cooler than normal!

But it seems nobody can understand this!

+1 !!!

And you are right, nobody seems to understand this...

BMW wrote the logic into the DME to lower boost as it gets colder as to maintain consistent output under all conditions... the piggybacks override this with their secondary boost control logic to extract more power out of the cooler temperatures, but the flashes all seem to keep the stock logic in place and drop boost as the temp drops...

[Mike@N54Tuning.com]

Nice video.. Exactly what would be expected, but really nice to see it in action

Mike

[marconi118]

Originally Posted by RiXst3r

+1 !!!

And you are right, nobody seems to understand this...

BMW wrote the logic into the DME to lower boost as it gets colder as to maintain consistent output under all conditions... the piggybacks override this with their secondary boost control logic to extract more power out of the cooler temperatures, but the flashes all seem to keep the stock logic in place and drop boost as the temp drops...

Perhaps there is a "IAT boost compensation table" somewhere in the code, then simply fill it with 1 so that boost stays constant.

Request to have more TQ/HP when IAT is low this is LOGICAL and SAFE for both engine and turbo.
The opposite: increase boost with hot IAT is dangerous, but OEM BMW is doing it to maintain torque constant.

Giac and other tuners don't disable it only because it requires some more work to find where is this "IAT boost compensation table" and change the values.

[Former_Boosted_IS]

Originally Posted by Mike@N54Tuning.com

Nice video.. Exactly what would be expected, but really nice to see it in action

Mike

Mike, thanks. Seeing the gauges next to each other gives a good view of what is really happening.

[Mike@N54Tuning.com]

Originally Posted by Former_Boosted_IS

Mike, thanks. Seeing the gauges next to each other gives a good view of what is really happening.

+1

[Terrance28]

What did you make on the dyno?

[Former_Boosted_IS]

Originally Posted by Terrance28

What did you make on the dyno?

I need to put a post together with all the numbers. I am not the best at teasers. It was a very large delta though.