Who's going to be the first here to try pre-compressor injection? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 12-10-2006, 10:46 AM   #1
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Default Who's going to be the first here to try pre-compressor injection?

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Old 12-10-2006, 11:12 AM   #2
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3whp gain on 610. No thanks. Not worth the damage potential.
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Old 12-10-2006, 11:37 AM   #3
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That's also the first time Aquamist attempted it, too. There are other threads with more recent examples of people getting better gains.
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Old 12-30-2006, 07:24 PM   #4
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WI pre turbo, that's a no-no. It'll erode the heck out of the impeller. A supercharger doesnt' suffer the same since it spins at, what, like 5 times lower rpm.
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Old 12-31-2006, 12:18 AM   #5
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wouldn't it just be easier to run nitrous at that point?
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Old 12-31-2006, 09:03 AM   #6
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Quote:
Originally Posted by braineack View Post
wouldn't it just be easier to run nitrous at that point?
Yes
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Old 01-02-2007, 03:54 PM   #7
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The impeller erosion would be minimized or done away with altogether when using these:

But, yes, the gains are not nearly as impressive as with pre-blower injection on a positive-displacement supercharger.

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Old 01-02-2007, 04:38 PM   #8
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WTF is that. great first post very help full but i don't know what to make of that.
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Old 01-02-2007, 04:39 PM   #9
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I dont know why you would run WI pre compressor, since its just going to compress the air and heat it up all over again.
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Old 01-02-2007, 04:44 PM   #10
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Added mass in the charge? I dunno. The more water you have in the charge, the less room you have for air.
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Old 01-02-2007, 04:48 PM   #11
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yeah not to mention the rust factor as it settles in the crossover pipe or IC.
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Old 01-02-2007, 06:28 PM   #12
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You have another point, water accumulation in the IC. If the turbo were non-IC then maybe, but with an IC in the plumbing, WI pre turbo is just a bad idea. Plus water is not compressible, and a turbo is a compressor, so you are giving up air mass for water. A positive displacement supercharger is not a compressor, it is just an air pump, so the WI is not being compressed. WI with an Eaton blower also helps seal the rotors to the case a little bit. On a turbo, WI should only be injected post IC.
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Old 01-02-2007, 07:14 PM   #13
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Hey, magna, remember that guy, Brian, who went by the handle "bripab007" and started this thread? Well, he and I are one in the same.

My account is busted...don't know how or why, but it no longer works. E-mailed Phil about fixing it or, if not, deleting the old account so I can just use this one with the same e-mail address as before, but haven't heard back yet.

Man, I forgot you can't even send PMs w/o 10 posts! Yeesh...I think I'll kinda miss being instantly recognized as an "old-timer," though, should I move forward with this account :(

So, back on topic, in case you hadn't guessed yet (I guess you didn't open the initial thread hyperlink in Aquamist's forum?), you can see that the gold-colored circular thingy is indeed a bracket for holding a water injection nozzle pre-impeller.
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Old 01-02-2007, 09:15 PM   #14
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Quote:
Originally Posted by magnamx-5 View Post
yeah not to mention the rust factor as it settles in the crossover pipe or IC.
Another reason not to go cheap on intercooler plumbing.
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Old 01-02-2007, 09:23 PM   #15
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I really can't imagine water settling in the crossover pipe...or even intercooler, for that matter. I mean, you're typically not injecting any water until a couple PSI, right?

Surely driving around for a few seconds in vacuum or light boost would be enough suck up any residual water in the crossover pipe, and the vast majority of any stuck in the intercooler.
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Old 01-03-2007, 12:19 AM   #16
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Nothing would settle but you would still get light surface corrosion in mild steel pipes.
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Old 01-03-2007, 08:13 AM   #17
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Yeah, you're right. Didn't think about that.
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