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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Moving to a trunk mount meth kit



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      07-13-2012, 08:05 AM   #1
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Moving to a trunk mount meth kit

I'm moving from the ww procede meth kit to a trunk mount but I'm not sure what gauge wires I need for the power and ground wires. Do you guys know? I've called Vishnu , left a voicemail and sent emails but they are really slow to respond.

Also, is it ok to leave my ground wire where it is in the engine bay and simply run my wire up there?
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      07-13-2012, 09:39 AM   #2
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14-16AWG is fine. I'd go with 14.

Yes you can leave your ground up there. Many people have simply extended the wires from the relay without issue, but thats only the positive terminal. You can ground it in your trunk somewhere just as easy, and without needed to run two wires.
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      07-13-2012, 09:53 AM   #3
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Thanks Tzu, I bought 12Gauge 12ft wires for both, with the same connections to mate up with the relay. Since i was going to route one tube, it would make sense to just route all of the wires and keep it clean. Is there a negative effect of using too big of a wire?
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      07-13-2012, 11:08 AM   #4
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I used 12 guage wire also and so far no issues. Just make sure you put a fuse into the power wire and your good. Smart your going with a trunk mounted tank. It's the best solution
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      07-13-2012, 11:45 AM   #5
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Quote:
Originally Posted by cn555ic
I used 12 guage wire also and so far no issues. Just make sure you put a fuse into the power wire and your good. Smart your going with a trunk mounted tank. It's the best solution
Thanks man, the Vishnu kit came with a fuse to the power already. I'm just essentially extending the wires. I've had it installed for quite a while now in the ww tank and I was just concerned about possible leaks... Just trying to be proactive.

Is it necessary to have a vent in the tank also?
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      07-13-2012, 06:29 PM   #6
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Quote:
Originally Posted by Sloppy View Post
Thanks man, the Vishnu kit came with a fuse to the power already. I'm just essentially extending the wires. I've had it installed for quite a while now in the ww tank and I was just concerned about possible leaks... Just trying to be proactive.

Is it necessary to have a vent in the tank also?
Yes most tank designs require some form of vent.

Mike
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      07-14-2012, 08:53 AM   #7
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Thanks mike, now what fittings should use to drill a vent as my tank didn't come with one. It's the 2.5 gal snow performance tank.
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      07-14-2012, 11:35 AM   #8
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Quote:
Originally Posted by Sloppy View Post
Thanks man, the Vishnu kit came with a fuse to the power already. I'm just essentially extending the wires. I've had it installed for quite a while now in the ww tank and I was just concerned about possible leaks... Just trying to be proactive.

Is it necessary to have a vent in the tank also?
My tank lid doesnt have any holes to vent and so far its fine, but then again my car is always parked indoors so the sun doesnt beat on the trunk to raise the temps of the meth all that much.
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      07-14-2012, 11:39 AM   #9
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Quote:
Originally Posted by cn555ic
Quote:
Originally Posted by Sloppy View Post
Thanks man, the Vishnu kit came with a fuse to the power already. I'm just essentially extending the wires. I've had it installed for quite a while now in the ww tank and I was just concerned about possible leaks... Just trying to be proactive.

Is it necessary to have a vent in the tank also?
My tank lid doesnt have any holes to vent and so far its fine, but then again my car is always parked indoors so the sun doesnt beat on the trunk to raise the temps of the meth all that much.
But I guess it aids in flowing the meth out by replacing the liquid void with air right... Makes sense in that case to allow air in and to let the meth flow easier?
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      07-14-2012, 12:59 PM   #10
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I guess that sounds right but I havent had any issues with my meth flow other than with cheap ass flow sensors from Snow performance
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      07-14-2012, 01:32 PM   #11
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It may not need a vent. It might have a vented cap. See what the internals of the cap look like or if they are solid.
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      07-15-2012, 06:16 PM   #12
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Quote:
Originally Posted by Jeff@topgearsolutions
It may not need a vent. It might have a vented cap. See what the internals of the cap look like or if they are solid.
Hmmm doesn't look like a vented cap does it?





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      07-15-2012, 06:24 PM   #13
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This may sound silly.....but try blowing through it.

Mine has a tiny vent hole about the size of that small circle in the middle of your cap. I can't tell if that circle is open or not from your pics.

It doesn't look like it is, but if it passes air then you are vented.
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      07-15-2012, 06:58 PM   #14
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Quote:
Originally Posted by Ilma
This may sound silly.....but try blowing through it.

Mine has a tiny vent hole about the size of that small circle in the middle of your cap. I can't tell if that circle is open or not from your pics.

It doesn't look like it is, but if it passes air then you are vented.
Yeah I tried, def not vented.
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      07-15-2012, 07:13 PM   #15
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That's the same cap that I have. No issues so far with flow
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      07-15-2012, 07:23 PM   #16
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Quote:
Originally Posted by cn555ic
That's the same cap that I have. No issues so far with flow
Cap looks clearly vented.
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      07-15-2012, 07:24 PM   #17
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Quote:
Originally Posted by Gugs View Post
Cap looks clearly vented.
If the top of the cap u put a pin hole in there, I would agree, but its not clearly vented. There is a hole where you can modify it to vent but it comes from Snow Performance sealed.
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      07-15-2012, 08:05 PM   #18
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I have the Vishnu Pwm kit as well. My cap is the same as yours and I went through ~8 tanks and no issues yet. I also put my ground/power/meth line in a tube for added insurance against rubbing. I called Vishnu and they said 12-14guage wires are good to use. So you're golden
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      07-15-2012, 08:19 PM   #19
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Thanks guys, I'm gonna get this puppy installed soon... I'm going through meth withdraw
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      07-15-2012, 08:35 PM   #20
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Looks vented to me with all the openings on the perimeter. I assume it is a one way vent to allow air into the tank as meth is withdrawn. You wouldn't typically want it to vent out of the tank as the vapor is a potential hazard.

Rather than trying to blow through it, apply a vacuum to it and see if air is entering through those small holes around the perimeter.
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      07-15-2012, 08:47 PM   #21
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Quote:
Originally Posted by Rks2k View Post
Looks vented to me with all the openings on the perimeter. I assume it is a one way vent to allow air into the tank as meth is withdrawn. You wouldn't typically want it to vent out of the tank as the vapor is a potential hazard.

Rather than trying to blow through it, apply a vacuum to it and see if air is entering through those small holes around the perimeter.
I had one cap that it did vent on top of the cap and after a few days I see the top of the cap stained with dry methanol (used snow performance boost juice which has a pink dye) This cap that I have from Snow Performance does not have this vent hole on the center of the cap and I havent seen anything or any trace after I installed this cap
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      07-15-2012, 08:55 PM   #22
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Would be cool if it was a one way valve... In fact I'm thinking of putting a one way valve in just in case. There is no way though this cap can vent anything. The rubber seal is around the rim of the tank so it's all closed up. There are no needle holes on the cap either.
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