4.0T h20/meth pre or post turbos

[RSDAN]

Hi could someone shine some light on the best location to put the h20/meth nozzles on the 4.0T and reasons why that location? there’s been mix controversy over this as I’ve been told to locate before turbos to cool them better on intake? Then told after turbos as it preforms better? Any info or if anyone has some Pics would be great


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[RSDAN]

129549


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[kaploww]

Ideally, at the intake port of each cylinder to ensure even distribution of water/meth to each cylinder.

Anytime you’re spraying pre-port injection, you get manifold wall accumulation.

An intake manifold designed to flow air evenly to each cylinder will not (at least that I have observed)) distribute atomized liquids evenly.

The ports at the back of the intake manifold typically see the largest concentrations of injected fluids, while subsequent ports going forward may see significantly less.

I have not directly observed a 4.0t and how it distributes injected fluids pre-manifold, however, I’d be willing to bet it’s not an evenly flowing piece.

[Chiromikey]

Ideally, at the intake port of each cylinder to ensure even distribution of water/meth to each cylinder.

Anytime you’re spraying pre-port injection, you get manifold wall accumulation.

An intake manifold designed to flow air evenly to each cylinder will not (at least that I have observed)) distribute atomized liquids evenly.

The ports at the back of the intake manifold typically see the largest concentrations of injected fluids, while subsequent ports going forward may see significantly less.

I have not directly observed a 4.0t and how it distributes injected fluids pre-manifold, however, I’d be willing to bet it’s not an evenly flowing piece.

Can you direct me to any articles on this effect in regards to meth/water injection (manifold wall accumulation)?

[RSDAN]

I’ve searched the internet and asked many questions to lots of professional installers of meth kits but nobody can give me a concrete location where to put the injectors on the 4.0T if it’s post turbos how do the turbos benefit from being cooled as the charge cooler pump pressure is not that great after stage 1
even with a bigger charge cooler the Cwa 100 will help but the meth injectors is the key to keeping temp down but WHERE ?? To achieve this


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[Dasquade]

It all has its pro's and con's i'm affraid. Injecting before turbos might help keep the turbos itself cool (one of the biggest sources that raise IAT 's) but might damage the fins at least when the nozzles arent able to atomise the stuff. After turbo (throttlebody) is often done, because it is the most easy place to put them, but i always read spraying water/meth on a cooling element (the charge cooler) is a big nono as it might heat things even more. SRM release spacers you bolt just after the charge cooler unit between the air intake manifold. Think that might still be the best position (same as custom drilled into the manifold). Kaploww might have a point that there might be a difference altough i think it might be minimum unless there is proven evidence of that. Curious aswell...

[Hofahome]

I’ve searched the internet and asked many questions to lots of professional installers of meth kits but nobody can give me a concrete location where to put the injectors on the 4.0T if it’s post turbos how do the turbos benefit from being cooled as the charge cooler pump pressure is not that great after stage 1
even with a bigger charge cooler the Cwa 100 will help but the meth injectors is the key to keeping temp down but WHERE ?? To achieve this


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Although I have never used meth, I have a system that needs to be installed and have read up on placement. Each has it’s pros and cons. Btw, the closer to the cyl, the better effects for fueling (ie. Octane boost). But further from cyl, the better for IAT reduction. You can of course do both but it would get very expensive and time consuming.

On our platform there is no ideal way to install meth IMO. The easiest place is between the turbo and heat exchanger but it is the least ideal place because it will make the heat exchanger way less efficient at cooling the air. You can do pre-turbo injection which really only helps compressor efficiency and thus more possible boost. To inject enough for heat reduction, you will likely cause compressor wheel damage.
For me, I am currently thinking about running 4 nozzles. 2 between turbo outlet and heat exchanger running small nozzles. Then 2 medium nozzles somewhere after the heat exchanger (still undecided on location). I may do something like this though:

https://uploads.tapatalk-cdn.com/20190702/9e5707154a94bdc522f6dbe24add59c2.jpg


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[RSDAN]

Thanks hofahome appreciate the feed back sounds like a plan, nice write up
I’ll keep you updated on my progress I’m in the process of making an alloy half moon tank for the spare wheel before I start ordering the parts needed to take on the task

[RSDAN]

It’s do you keep the turbos cool and maybe kill the compressor wheel or after the throttlebodies, i just rebuilt my turbos with billet alloy compressor wheels so don’t wanna be doing this on a regular basis, I just had a look a SRM kit wow! pricey when you could knock them spacers up on a cnc machine easily the rest of the kit is you could pick up for £399. Thanks for the feedback