I got my meth injection kit mainly for it's octane raising ability so I can run some decent timing since I am running 91 pump.

With that said, if I were to inject pre-turbo would I still get those effects? In addition to the increase of compressor efficiency?

I want to do the pre-turbo injection mostly because it would be much easier to install since I wont have to get a bung welded in. And my tank and pump are going right in that area as well.

Per turbo meth is typically used when your turbo is maxed out and your trying to squeeze every last ounce of power out of it. Also from what I have read pre turbo meth tends to wear down the compressor wheel. People that run preturbo also typically run another nozzle post intercooler.

To answer your question, yes you would still get the octane raising ability no matter where you put it in the piping. Pre turbo meth only won't lower your iat's that much compared to putting it after the intercooler.

I have fully researched pre-turbo injection. The exact opposite of what you stated in relation to nozzle placement will happen.

Pre-turbo injection cools the intake charge at the source of the heat, the compressor. It drastically reduces IAT's and if you inject enough you will no longer even need an intercooler. People have reported their intercoolers FROSTING over injecting pre-turbo.

In addition to the drastic IAT drops, compressor efficiency also jumps. Which will be a positive result whether or not you're maxing a turbo.

I ask about the octane bump because if the pre-turbo injection is working properly the meth will be evaporated long before reaching the throttle body, ideally as it hits the compressor.

I guess it really comes down to whether or not it's better to have the meth evaporate in the compressor, or in the combustion chamber's themselves. In relation to stretching the abilities of pump-gas.

Spot on Zenkei. It comes down to how much, where, and what you are injecting. From my own research, and I am in the last leg of installing my own water injection, you want to run a maximum of 1gph or 70cc/min precompressor for WATER to fully saturate the air and lower IAT without worrying about condensation in the intercooler. For a 50/50-30/70 WM mix, I will be running a 3gph on my 2.3 E316g. For straight alcohol, you an run any size because it all vaporizes @ the ex. tip. So precompressor injection is somewhat limited.

Dual nozzle setup is best with a small nozzle precompressor, and a 2nd nozzle as big as you need located about 6" from the TB. I will be running a 3gph pre and 5gph in my BOV pipe @250psi.
My .02

Oh and the vaporized alcohol still makes it to the chamber via the aircharge, and burns slower aka higher octane. For knock resistance, that is the 2nd nozzles job as the cool aircharge carries water/meth droplets into the CC , absorbingvmore heat and creating a more of a steampowered "push", instead of the usual "bang" on the piston top. Tuning is crucial to gain the most out of the slower burning mix by advancing timing from TDC via safc, GM maft or DSMLINK.

Thanks for the info.

I will most likely be running the -20 degree washer fluid mixed with 3 or 4 bottles of HEET for fluid. Whenever I am at the track I can pick up some pure methanol from there.

The nozzle that came with my kit is rated for 5-6 GPH, which seems like it may be a bit much for pre compressor according to what you're saying.

I keep seeing more and more posts from people that are spraying more and more pre-compressor. And compared to a lot of these set-ups 5-6GPH doesn't sound like much.

I agree with brane, if you want to run pre-turbo injection then I think you should use a small nozzle before the turbo and a larger one after the turbo. A smaller nozzle will have a finer spray which will get agonized much quicker and prevent any pooling in the intercooler and give you higher compressor efficiency. The large nozzle after the turbo will give you more of a water injection effect and will help with knock.

But if meth damages an aluminum turbo wheel by corroding it, why is there no damage done to intercooler pipes or heads?

Also, from what I've read, you will want to stick a solenoid on the line going to the pre tubo nozzle to stop it from dripping and the drops hitting the compressor wheel as seen here: Pre-turbo meth injection - Club DSM Canada

renovatdkitchen said:

But if meth damages an aluminum turbo wheel by corroding it, why is there no damage done to intercooler pipes or heads?

Also, from what I've read, you will want to stick a solenoid on the line going to the pre tubo nozzle to stop it from dripping and the drops hitting the compressor wheel as seen here: Pre-turbo meth injection - Club DSM Canada

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The damage is not about corrosion, it's about particles hitting a fast moving object.

I don't think the oxidation is as big of a problem as some "chemists" make it out to be. If you are that worried about it, start with washer fluid so the blue dye coats everything, and then run the regular stuff.

That's what I mean. The "chemists" out there are confusing people. Hence why our intercooler pipes and heads are fine from meth injection already.

I am going to do pre turbo meth injection, probably pure meth and run the solenoid to stop it from dripping.

My setup does have the solenoid. I'm just gonna install it and see what it does. My compressor wheel is billet, so it should be resilient.

Theres a youtube video where a diesel guy sticks a go-pro cam inside of his air filter pipe, the camera is pointed looking at the compressor wheel, you see the water/meth system turn on, you see the effect the swirling air has (my opinion its bad) pretty interesting to see. Ill try and find it.

Boostdriven, do you have a picture of the "air straightener out blades" inside a air filter pipe? that would be nice to post

I think I've seen those video's. The ones 95gstracer posted somewhere right? He was injecting like 14gph into the turbo which is tons more then anyone would ever recommend.

[ame=http://www.youtube.com/watch?v=F51xymg33-w]Pre-compressor water injection - YouTube[/ame]

Yes, the above video is an awesome setup, but not ideal for the OP. He was injecting a huge amount into a HX35 on a Ford 2.3. That intake is sex. And your having a billet wheel should be no problem for the mist of Zeus ..

So we all agree, small nozzle preturbo and big nozzle near TB. What is your engine setup Zenkei?

Here's my mods copied from my link forum's sig.

Stock engine, Speed Density, Link V3, AEM UEGO, FIC 1000cc's, Billet 20G, FP Race mani, Tial MVS 38mm w/Punishment O2 housing, FP intake, HKS SSQV4 BOV, ETS Street FMIC, Megan DP, 3in catback, Fuel Lab FPR, Walbro 255hp rewired, Dynatek ARC2, ACT Streetlite Flywheel, ACT 2600PP, SB Kevlar Disc, Shep Stg 2 Trans w/ Quiafe, Mishimoto X-line Rad

I guess for now I will see how it does with the pre-turbo injection. Then when I can get a bung welded in get one of those Y fittings and add one to the intercooler piping before the throttle body.

dsmcurse said:

Boostdriven, do you have a picture of the "air straightener out blades" inside a air filter pipe? that would be nice to post

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I don't have any pictures at the moment but I will take a few and post them when I get a chance. You should post few pictures of your intake pipe, its pretty much the same thing that I have.

ZenkaiRacerDsM said:

Here's my mods copied from my link forum's sig.

Stock engine, Speed Density, Link V3, AEM UEGO, FIC 1000cc's, Billet 20G, FP Race mani, Tial MVS 38mm w/Punishment O2 housing, FP intake, HKS SSQV4 BOV, ETS Street FMIC, Megan DP, 3in catback, Fuel Lab FPR, Walbro 255hp rewired, Dynatek ARC2, ACT Streetlite Flywheel, ACT 2600PP, SB Kevlar Disc, Shep Stg 2 Trans w/ Quiafe, Mishimoto X-line Rad

I guess for now I will see how it does with the pre-turbo injection. Then when I can get a bung welded in get one of those Y fittings and add one to the intercooler piping before the throttle body.

Click to expand...

Make sure the solenoid is on the pre-turbo nozzle, and put a solenoid or check valve on the second nozzle.