MAF sensor install on the NSX

Has anyone had any success installing a Mass Air Flow sensor in the NSX?

I'm in the process of tuning my water mist setup. It's already connected to the MAP Sensor to read boost. I'm using a CoolingMist VC2 controller which has the ability to progressively spray from 25%-100% duty cycle from boost and another 0-5v input. The built-in algorithm manages the flow.

Why a MAF you ask? The CTSC provides instant full boost. Therefore the MAP signal for boost doesn't work very well as a progressive input for the spray controller. I need to use them both.

It seems pretty easy to incorporate a 3-wire Nissan or Ford MAF sensor somewhere before the throttle body.


Thoughts?

Here's my Easter morning water/meth spray install

I'm on the fence if to leave the controller in the trunk or in the cabin. Easier to tune in the cabin but it's ugly as sin.



I was hoping to find a more incognito location for the tank but this will have to do for now.

MAF makes sense, what about IAT? higher temps more meth?

I have been monitoring iat but it just seems so slow to be of any use for a progressive controller.

So you're trying to use the MAF as a controller input specifically to control the flow of the water meth? Wouldn't you just need to find the pin out for the MAF, get the pigtail and wire the respective ends of the pigtail to a .5V reference, ground and signal out to the controller? It would make more sense to go off of iAT because you're trying to cool the charge, and keep the temps somewhere within a certain range, so what better sensor to use for reference than the air temperature sensor. Hotter = increase duty, as the charge becomes cooler the duty will decrease. You could get a fast acting sensor to provide a less delayed reading. If you have AEM you could even wire the controller to the EMS, and have the EMS activate the progressive controller to come on based on a parameter setting point.

Tech7042 said:

So you're trying to use the MAF as a controller input specifically to control the flow of the water meth? Wouldn't you just need to find the pin out for the MAF, get the pigtail and wire the respective ends of the pigtail to a .5V reference, ground and signal out to the controller? It would make more sense to go off of iAT because you're trying to cool the charge, and keep the temps somewhere within a certain range, so what better sensor to use for reference than the air temperature sensor. Hotter = increase duty, as the charge becomes cooler the duty will decrease. You could get a fast acting sensor to provide a less delayed reading. If you have AEM you could even wire the controller to the EMS, and have the EMS activate the progressive controller to come on based on a parameter setting point.

Click to expand...

Problem with using temps is that you could end up squirting water at 100% while at idle or low throttle, so too much water, might quench the combustion or such. The idea with water injection it to make it proportional to the amount of air...which MAF sensor actually measures.

Anyway, let's get back to the question. What MAF sensor, where to mount, etc?

^^ What he said.

IAT makes a poor choice. The sensor itself heatsoaks so even having a faster moving sensor won't really matter. IAT may be good as a ON/OFF switch for the system itself. In other words, if say IATs creeps over 145F then the system is activated but that's all i'd use that trigger for. On a turbo car it may be different. CTSCs are a different animal.

Take a look at a snap shot of my data log. This was a 1st, 2nd, 3rd WOT street pull. Look how flat IAT is from 141F to 192F. Ignore the numbers to the right. Focus on the data plots.

To me MAF makes the most sense. Even RPM or TPS is not a great sensor input in my mind.



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I found a MAF that might work. The 80mm Nissan Q45 sensor seems to flow a ton of air. It also has the simple 3 wire setup with a 0-5V output vs. one that gives a frequency output.









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Just spoke to my friend who is helping me tune the HKS F-Con. He said he can build a basic rpm vs load voltage map output from the F-Con. This will help water from not being injected too much at the low rpms. It will all come down to the nozzle size and ramp rate that will give best results. I'm excited. This will be the best way to do it w/o a MAF. I still think a MAF would be a more straightforward way and not have to worry about a ramp rate to adjust.

http://www.snowperformance.net/product_images/product_variation-installation_pdf-9.pdf

Seems the hard part is not hooking it up, but deciding what MAF sendor to buy. Have you tried calling the Snow Performance folks to see what vehicle's MAF sensor they think would likely be good for your application?

latzke said:

http://www.snowperformance.net/product_images/product_variation-installation_pdf-9.pdf

Seems the hard part is not hooking it up, but deciding what MAF sendor to buy. Have you tried calling the Snow Performance folks to see what vehicle's MAF sensor they think would likely be good for your application?

Click to expand...

i have not called them because I'm using coolingmist (a competitor) but I should pick their brain anyway. They should be a standard 0-5v signal.

Like i mentioned in the methanol injection, i personally dislike MAF i see the issues with them daily in Subaru and Maserati's, (failing and flow issues)

I would run a RPM based system that maps the flow/injection to the RPM.
You can then elaborate on that system.

Possibly you could also run a intake vacuum pressure based system.
Rather oldschool low tech solution to the MAF but it would work like a map sensor on behind the throttle body.

Making your water injection system work like a mechanical fuel injection system, or like a vacuum advancing unit.

Do you know of a signal converter that will convert the rpm pulse signal to a 0-5v signal?

I recall that HKS makes a converter, i'd need to look up a part number but can't be more than $40-50 i guess.