Ok, so I've been trying to figure this out definitively for days now, and can't get a solid answer. Some people use factory wiring, some make modifications to the S1 fuel pump assembly, some swap out for a S2 assembly with modifications and wire it up to the battery with a relay. It seems like there are 15 different ways to upgrade the fuel pump.

Here's what I'm planning on doing:

I am planning on doing a 325-375 RWHP turbo setup (will be on the higher end if I eventually use meth injection). I'd like to use the factory wiring, S1 fuel pump assembly, make the modifications to the assembly, and drop in a DW200. Trying to keep things as simple as possible.

Will that work? Will that be sufficient? I'm not sure which parts are actually necessary and which aren't. Seems like most of it is still up for debate from what I can tell. I've even seen that someone ran a totally stock fuel pump but with AN6 line to the fuel rail, and they were making 380 RWHP.

 

The various Facebook groups are a spaghetti mess full of tons of misinformation and outright bad information with just a little bit of helpful info. I saw your post over there and it turned into a disaster in the comments section that I didn't want to touch with a 10ft pole.

Skip the DW200 and just go up to the DW300. It can be done with the S1 assembly or the S2 assembly, there are advantages and disadvantages with each respective option. You can modify to go with a different fuel supply setup like the AN6 if you really want to but several individuals do fine without it. Just be weary of suggestions and look for documented builds with proven results. 90% of those who have given their opinions to you on the matter have semi-functioning or non-functioning 8's that have never seen any amount of forced induction.

Typically speaking, Google is primarily to blame for that. The AI driven results of the search engine combined with SO much misinformation on public sites, not to mention all the clickbait stuff with false or misleading information is further exacerbating that problem.

 

Thank you! This is more of the type of response I was hoping to get.

I’ve only been in the RX8 world for a relatively short time, but have a decent amount of experience with cars. It has become very clear 80% of the people in that group have no clue what they’re talking about.

Looking through everything, is it even necessary to make the modifications to the S1 fuel pump assembly? Or is it something where I can just upgrade the wiring (with the DW hardware kit) and drop the DW300 into the assembly?

 

I melted the relief valve and opened the venturi like Brettus does. DW300 pump. Im doing perfectly fine. Might do the AN6 just to eliminate the risks of having old clips of my oem lines to avoid any disasters.

 

Awesome. And you're using the S1 fuel pump assembly?

Also, would I have any problems running this fuel pump on my stock Renesis for a while until I do the turbo installation?

 

S1 assembly, no issues using while naturally aspirated.

 

Awesome--I appreciate the clarification! With all the information going around, things tend to get a little jumbled. Would be nice if someone made a "How to Modify Your RX-8" book.

 

why anyone would want to use an inferior S1 pump module rather than the superior S2 pump module is just like all the other things people here do that make no sense. The S1 fuel filter is not replaceable like on the S2 and in addition to not having to monkey around with the relief valve on the S2, now there’s a higher flowing replaceable aftermarket relief valve available for the S2 module as well.

To summarize; S2 fuel pump module + Deatschworks DW65c pump (255 lph) *or* DW430c (430 lph) + Deatschworks in-tank pressure regulator valve (65 psig @ 440 lph)

https://www.rx8club.com/series-ii-af...thread-261755/

https://www.rx8club.com/series-ii-af...2/#post5003528

https://www.rx8club.com/series-ii-af...5/#post4991666
.

 

I originally got the DW300c for my lift pump on my rew swap and ended up throwing it into my greddy renesis car. The only thing I noticed was I ran out of fuel at 1/8th a tank while testing, which is probably since i had not opened the siphon. Pressure was still at 58psi with key on. The pump quite literally just went in and plugged in to my assembly.

I will say I have had 3x S1 cars and all three times the fuel pump assemblies looked different. So I wouldn't assume your assembly is 100% the same in every way. If you are getting a new assembly I would go the S2 route as others have documented.

 

you can buy a low volume/pressure lift pump from Deatschworks that fits the S1 fuel pump, along with an S1 low pressure ballast resistor to install and wire up on the other side of fuel tank in place of the siphon pickup to always have pumped flow feeding over to the fuel pump side of the tank rather than rely on the siphon. There would be several different ways to add a control scenario if you intend to run the fuel tank down below 1/4 full and are worried about the lift pump running without pumping fuel. A lift pump will tolerate running empty better than a standard pump though for sure.
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My goal for the time being is to start with the most “simple” solution. I’ll keep fuel above 1/4 tank, and if I have issues I’ll revisit. I have the DW300 hardware kit on the way. I’ll get it installed soon and see how everything acts. Good to test as much of this as possible before doing all the bigger changes.

 

Installed everything and took it for a quick 5 minute drive. Got it up to about 7500 RPM and everything seems ok so far. I think I'll try taking it to work tomorrow (60 mile round trip).

 

Following! What did you end up doing in your installation? And are you on a 4 port is that why you only revved to 7500?