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Questions on my direct port meth setup
New New Update
Now making 775BHP with an EFR 8374 turbo using direct port meth on a 2.1ltr 4 cylinder engine - post number 53 has more details, this setup has been in this car for over 4 years with a lot of track use, it's a solid setup with 0 maintenance doneand still running the same engine after all this abuse NEW UPDATE Now making 482WHP with 4 x 0.5mm jets, refer to page 4 post #44 All I can say is - Direct Port Meth FTW!!! Best mod I have ever done in 15 years of modifying cars...... I now run 4 x 0.5mm (but I started with 0.4mm jets) check valved jets in my intake plenum through the Aquamist kit (it's now always running for track as well). For more information is best to pm or email me - robmonckton@gmail.com I'm happy to share all the details. Hi All, I know there is couple of threads on direct port but I just need some help understanding a few things and see what you think of the setup. I'm in the process of fitting an HFS-3 kit to run 50/50 water/meth on my EVO X. The engine is a stroker build with CBRD BorgWarner 7163 turbo kit putting down 430whp @ 1.7 bar boost on a heart breaker mainline dyno. (1,000 cc inj and will run 1.9bar with this meth kit) I only want to use the kit to help control knock and a little more power. I keep reading of many evo's having issues when only putting meth in the I/C pipe due to cyl 1 / 4 not getting equal flow (I had that problem already with the stock engine). So I am putting 4 nozzles into the intake manifold (pic below for location). You can see the drilled holes for the 4 nozzles. I'm going with 4 x 0.4mm jets. Do I need to be worried about under vacuum sucking the meth through the lines? do I need something else to be added with the HFS-3 kit (I read about the check valves but don't quite understand if that is needed fo rmy application)? Thanks in advance Rob Singapore Last edited by robos4; 06-01-2020 at 02:32 PM. |
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Re: Questions on my direct port meth setup
If you use a metering valve like the FAV , you won't need a additional check valve. There is no pressure differential across the jets.
I would even considering installing 0.5mm jets in your case. Disadvantage is yout mapping depends more and more on the WI the more you inject. If you use the car on track, consumption goes up a fair bit as you are on the throttle a lot. |
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Re: Questions on my direct port meth setup
Rotrex, I have a different view on this...
DP jets do require isolation after the FAV unless you are using four FAVs. The pressure/vacuum does fluctuate between ports due to the inlet valve opens and shut at different timing intervals especially after lift off. The fluid inside the tubing will commuting and eventually being emptied. It is important to minimise this effect especially on engines with aggressive cam profile. This can cause pre-ignition or worse still, blowing up the manifold when high concentration of methanol is use. This is the reason when we offer the DP bundle for a one-stop solution.
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Richard L aquamist technical support |
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Re: Questions on my direct port meth setup
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Have you tried to put the nozzle just before the throttle body ? see attachment |
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Re: Questions on my direct port meth setup
A 4mm line with a 2mm ID with a 2mm ID has a volume of about 3ml per meter.
That dribble from 4 nozzles spilling over the course of few seconds won't blow up anything. With aggressive cams you blow way more fuel from the cylinder into the manifold under those conditions. Even fuel cut on overrun will continue to inject fuel for a few hundred milliseconds tapering down to prevent catalytic converter overheat from sudden inrush of excess oxygen. |
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Re: Questions on my direct port meth setup
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Sorry I meant I had problems without meth on the stock engine (when I rebui8lt it), cyl 4 was damaged due to running too lean. It must be a poor design from the intake manifold as it's obviously not getting equal flow. (the injectors were flow tested and came back fine). Putting a jet just before throttle body in my mind wouldn't help me cure my cylinders receiving un even flow still. Rob |
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Re: Questions on my direct port meth setup
Hi!
Is it a good post!, where exactly do you install the nozzles in the intake manifold? In my car, I don"t know where is better... Do you install it where the red marks are you painted? |
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Re: Questions on my direct port meth setup
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You are using stock intake right? Are you saying that Mitsubishi designed a poor design? If that is the case I would consider making a custom one that will provide equal flow to all the cylinders and use one pre throttle body. Water/meth could help but the setup is not right. |
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Re: Questions on my direct port meth setup
Thanks Parmas,
Sorry, so you are saying my meth setup is not right? I would imagine most people chasing bigger power goals would go with nozzles in the IC pipe pre throttle body (and possibly in the manifold too) but I'm primarily going to use it for knock control. Well, it's a fun project and it should all be complete and tuned by next week. - Stock it gets 215whp - Stock engine and bolt on's with HKS 7460 turbo got me 348whp (1.75bar) - HKS stroker, MX1 cams, oversized valves, PNP, CBRD 7163 turbo kit, got me 424whp but I didn't set the IWG properly and wasn't holding boost.. - Now adding external fuel pump, larger intake, meth kit and firmer wastegate tune next week and shooting for 450-460whp. Rob |
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Re: Questions on my direct port meth setup
The ID for a 4mm hose is 2.5mm. Also the volume in the distribution manifold is 2-3cc of fluid and decompression of the pressurised hose. I can see 10cc or more will be seen. Having a inline checkvalve should cut it down by ~80%
The likelihood of an explosion is subject to stoichiometric, not easy to predict the exact amount of air after lift off. It can happen as long as there is fuel left in the manifold. At what phase does the over-lap blow fuel into the manifold? I was referring to the exhaust stroke. I do think the modern multipoint sequential system inject fuel during this period. Also, the delay wmi injection on the next event, cavity has to be refilled before reaching the tip of the jets.
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Richard L aquamist technical support |
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