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Any tips for mapping with water/meth injection

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Any tips for mapping a car with water meth injection , I tuned a car with one of the first aem kits and was very disappointing tbh il have a car to tune on aqutmist soon so any tips and advice would be great thanks

Hi Chris,

I just posted a question related to tuning with water/meth also, I guess I should have checked to see if anyone had asked the same question.

I just started tuning with it yesterday and its amazing how cool my intake manifold is after much spirited driving. Normally it is heat soaked very hot, so much that you cant touch it; now it is actually just barely warm.

The detonation I did have, disappeared and I started adding timing but unfortunately ended up blowing a headgasket that night, Im trying to figure out whether I experienced detonation without hearing it.

Do you have a knock listening device? Are you tuning on a dyno(load holding or only inertia?) or street?

Go to the Aquamist forum. there is a lot of information there.

You need to run much leaner AFR than usual, probably 12.5 or leaner.

You can add quite a bit of timing. It is best done on a dyno with knock listening.

Amount of methanol is also important. Start with a 50/50 mixture of water.

What is the BHP on your engine?

The total amount injected depends on the fuel quantity.

I would suggest starting with 10%.

Engine will be roughly 270hp it's only a 1.3 (4efte) il be tuning on the road , thanks for the advice il check that forum out too

The last car I had on the dyno had an AEM kit fitted, tbh it caused issues and lost power. To be fair it was only being used for safety rather than dialling it in as he was mixing it himself and has got his mixtures wrong in the past.

What I normally do is tune the car without it activated, monitor the IAT's then once your finished activate it and tune again then have the map switch over or compensation activate when the water injection is activated.

What ECU are you running?

Link G4+ atom , last time I set it up so if the low level switch was triggered it switched to safe fuel and timing maps il be doing it this time also

So are you running it all the time until it runs out or do you have conditions for it to activate in the ECU? I've not played with an Atom yet, does it get full use of the G4+ software?

the only G4+ ive used is a atom and its great really really impressive ecu for the money , yeah it will be running all the time on boost tho I might set up a switch for to change the ecu tables and turn the meth off , the kit we will be using comes with a flow gauge etc if theres a 5v out (not sure yet ) I might set up a gp limiter if the flow is not what it should be , should help abit for safety if the driver is not keeping a eye on the flow

the only G4+ ive used is a atom and its great really really impressive ecu for the money , yeah it will be running all the time on boost tho I might set up a switch for to change the ecu tables and turn the meth off , the kit we will be using comes with a flow gauge etc if theres a 5v out (not sure yet ) I might set up a gp limiter if the flow is not what it should be , should help abit for safety if the driver is not keeping a eye on the flow

My personal preference for water/meth is to have it as a safety so I'd only have it activating on IAT's and boost rather than boost alone, you can set this up in the software. I think the only limiting factor is your I/O's on the Atom, do you have enough for the flow sensor to go into the ECU?

the idea y the guys wants to add the meth is to run more boost and timing (not the best idea I know) yeah I have an3 free to add a sensor if I need too , il see how I get on with pump gas with out the meth first as I feel it pretty risky

I think it's a great idea if you have a failsafe setup.

I have my ems output that triggers the meth pump run through a level sensor, as long as the level is good it turns the pump on and sends an input signal to the ecu to switch maps. If fluid level is too low the pump doesn't get turned on and the map doesn't get switched to aggressive timing/afrs. The only thing I would prefer over the level switch is a flow sensor, to ensure I am actually spraying, but that's a risk I'll take for the time being.

What sort of IAT's and boost are you at with your tune just now?

I've not even started tuning this car , theses engine are prone to knock so on pump fuel most of the time ur miles away from mbt, the guy wants to run 1.8 bar

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