I have a 2013 GS with an A&A system (V3 Si). It was tuned by A&A out in California. I was reading about the Alky Control kit you sell and how they can offer a little bit of protection against detonation with the only available 91 octane out here and it can also help cool the intake charge.

I read there are a couple of ways to have the system turn on. I had some questions and needed some info.

1 - Replacing the OEM MAP sensor with the LS9 MAP sensor. Does this need to be done?
2 - Does one need to install an IAT Sensor on the charge pipe? I read that doing so it can be tuned if the IAT temps rise, the PCM can start pulling timing.
3 - Having a tune set it to be at 11.8 AFR under full throttle and boost. With all knock sensors functioning and all safeties in place.
4 - Does the supplied MAP sensor have a 3/16 vacuum hose on it. Is that tied into the blow off valve to turn on the meth pump?
5 - Better to run 100% meth or do 50/50 water/meth?

 

Your mainifold air pressure sensor was already changed out, since the oem one , can not read much over 1 atmosphere
Hence best it can read is about 15psi, which is about the most standing air pressure your going to be on in earth, which would will be under see level.
At sea level, standard air pressure is about 14.7 psi and it decrease the higher you get in elevation.

So when adding boost, if at sea level, air is already 14.7psi that MAP is reading,and when you adding boost, then your increasing that pressure, and the New MAP sensor needs to be able to read at least 2 atmospheres if S/C is pushing another 14.7PSI. If SC is pushing over 14.7psi of booster, the Map need to be 3 atmosphere unit to read that amount of pressure..

For meth, run 50/50, since your not pushing enough pressure that it will require straight meth to get the higher octane levels needed instead. Plus with distilled water, will get the air pressure coooling (think swamp cooler), the increase HP from water turning to steam on the ignition downstroke, and the cyclinder cleaning from the steam as well.

Your AIT sensor is part of the MAF sensor. and is already between the S/C and intake manifold (after the intercooler), so your going to spray the meth before the Maf sensor/after intercooler, so the IAT sensor can see the difference in the boosted air temp from the water spray..

As for tune, once you have meth kit in play, then it not just AFR, but the amount of timing you can advance without getting detonation problems to start with, then you get into afrs that are producing the higher amount of Torque and HP instead.

Sncef you are in CA, better come up with a plan that will get you past SMOG to get plates and renew ever year. the minute that your C.A.R.B approved canned tune is changed, will cause you to fail smog. So canned approved tune needs to be in the car to pass smog inspection (and any other mods need to get it work correctly), so will need a way to swap back and forth between tunes (and mods needed back and forth as well)

Also, tie Alky kit back to ecm, since if alky kit has a problems, ecm need to resort back to safe tune when that happens.

 

My opinion: don’t touch timing in the tune and just benefit from the full timing map from not pulling due to iats and octane increase.
Once you start leaning hard on timing, now you are reliant on meth vs just making the car safer and consistent
That 85-100whp bump I quoted on my setup before was without touching timing as I was adimate about not needing to rely on it to avoid more safety nets.

 

I'm actually at 5,000 feet (Arizona) but the car does go do to lower elevations occasionally (1,000 feet). So I already have the LS9 MAP sensor in my car? I can leave the sensor alone?

Okay, I will do the 50/50 mix. Not 100% meth.

Is that the AIT/MAF sensor in the picture? Where should I mount the Meth spray nozzle?





I'm in Arizona (no emissions in my location)

 

I agree. I don't want to push it to the edge and risk leaning it out and detonating. I just want the added benefit of increasing the octane and cooling/cleaning of the cylinder.

I will not mess with the timing in the tune.

Does 100% meth help cool the intake charge or does it just raise the octane rating?

 

Does running 100% meth injection affect the 02 or CATS?

 

No more than any other additive I am sure.
Dont Limit yourself to just alchy control.

 

Better to ask over in the FI section.

100% meth is the norm.

You'll need to discuss with your tuner when installing.

 

What do you mean? As far as the system manufacturer?

 

as a manufacturer. They have a nice kit, but they aren’t the only game in town

 

There are a few others but Alky Control is the most popular for our cars.

Can any of the others handle straight methanol?

 

Most kits can't handle 100% meth. The Holley kit says it can't.

Interesting read on water/meth injection:

https://www.holley.com/blog/post/the...2kwcw7Jh8I0T8g