Hi there. Wondering if someone out there can help me out with an idea I have about installing a water/meth kit. The standard process is to install the noozle after the MAF because the water/meth will distroy the MAF. This however doesn't read the actual AIT. This is my idea install the noozle after the MAF, disconnect the AIT wires from the MAF and install a another AIT sensor as close to the intake plenum as possible. This way the ECU is reading the air temp after the water/meth spray. I know the the ECU pulls out timing as the ait intake temps go up. I'm using uprev for tuning and I know that you can add timing to the map to compensate but how many other things are being changed by the ECU when it's reading the boosted air charge. If this can be done I think we could get a more precise tune because the ECU would always be reading the actual AIT.

Thoughts or comments?

 

I think there is a few people who use this on their f/I cars and they spray before their fmics to get the best atomization out of it. Read some f/I builds.

 

I'm injecting right before the throttle body with my Vortech setup, but I've heard folks with turbo setups placing it before the impeller (Pre-Turbo) for the best atomization. There are sites that give examples where to place the nozzle along with the pros and cons at each location. Here is one I found that I read.

http://www.alcoholinjectionsystems.c...icle_info.html

 

Thanks for the input. I have looked into doing both. Pro and cons for each. Preintercooler works however possiblity of water collection in the bottom of the intercooler. Pre turbo is really not a good option. Water/meth is hard on the impellers and the majority of the heat being created is from compressing the air. I have looked at the site you provided the link to and before the throttle body seems to be the best option. However, having as far away from the cylinder is also recommended to ensure good atomization. Due to the MAF being so close to the plenum there isn't much distance between them.

My thought for the additional AIT sensor is so timing and fueling are controlled by the ECU. Obviously there still has to be tuning done to compensate for the water/meth but having the ecu read acutal air intake temps I think could be quite beneficial for an overall good and safe tune.

Just throwing out and idea to see what others think.

 

Sub'd

 

You can place an aftermarket sensor in the intake manifold for a more accurate post injection temp reading. The calibration curves are all fairly similar so the stock ecu should process it similarly. I posted the calibration curves for the stock and several other sensors years ago. I believe the HKS sensor is very close to stock and has the advantage of being smaller (1/8" npt), if you can find one.

 

I have never seen any AIT comp tables in Uprev?

Either way, i doubt its very much as the det tables are what kill your timing. The meth will keep you out of the det tables. Plus with meth, you should be dropping the AFR at least 1 point while spraying. There is alot more stuff to worry about before AIT trim.

But remember you need a closed element AIT, if you do wanna go down that path.

 

^ there are none to my knowledge, so if you're going to use aftermarket, better to get one that is close to stock, right?

 

Thanks for the input. I know the det tables ultimately control timing but I was just bouncing some ideas around to see what others thought or for that matter had played around with this kind of thing.

 

How does spraying Pre-Impeller effect the way that the MAF Sensor reads the Air?

 

Same way that spraying it pre maf would. The meth/water will accumulate on the maf regardless of how well atomized it is.


Meth/water will show lower AIT than actual AIT because it likes to collect on the sensor as it passes through.

 

Hey Resmarted,

For the purpose of this topic, lets pretend OP placed his meth nozzle post intercooler. Would the fluid accumulating on the MAF sensor cause detrimental effects causing any damage to it over time?