That actually happens in the exhaust manifolds too, and there goes your turbo...

better fuel pump setups are an interest to us little bitty 2 rotor track ho's with fuel starvation issues. would this work for us also?
This does circumvent the oem safety features? Right?
OD

he he.

i might have a frankenstein answer for that late tomorrow afternoon.. :)

and as a minimualist i think you will enjoy it..

beers :beer:

moon, my answer got lost in my quick pre-post editing. fyi, about your LIM offer, my answer's an enthusiastic yes. i had no idea of such welding complications, but i didn't plan on using that intake for a long time anyway. there are just other things i need to finish before getting the measurements you need--mostly mounting the engine. but before that, i'd like to finish the wires & ignition stuff because engine is already half-off the car and i received the m&w stuff already. i stopped just because it was way too cold this morning to work in the garage.

about clearance, good news is that my secondary fuel rail will be secured onto the UIM and my primary rail will be secured to the engine block. so even if i build everything with the current LIM, it shouldn't affect any potential clearance issues with the new LIM.

will pm you when the engine's mounted with the measurements & photos.

btw, do you recommend any specific alloy type and thickness for an aluminum plate purchase? i just need it to make misc brackets/tanks and such--for ignition box mounting, e-water pump mounting, radiator overflow tanks, etc.

od, i'm sure you already know, but we were talking about return style system. i think stock rx8 uses return-less system where only fuel vapor comes back, condense on the evap, then returned back to the fuel tank.

this also reminds me. i thought i read somewhere today that rx8 ecu controls the oem rx8 fuel pump to avoid flooding the engine. inline pump that's always on may be a bad idea unless you can reroute the excess fuel somehow. that's probably reason why mazsport upgrade is killing the engine... i don't know any details of how ecu modulates the oem rx8 pump, but unless it's only at the fuel rail pressure, any other replacement pump could slowly flood the engine.

i just setup my return line for my fuel system to today ill pm the details of how i did it to you. as for the fuel pump i havent tried to power everything up yet to see how it works without the stock ecu. im going with a aeromotive inline pump.

wait before you do that, you should read some a1000 reviews on rx7club.com. they all say it's ridiculously loud. i think your goal was a daily driver, so i thought you may be interested to find out.

here's the link:
http://www.rx7club.com/showthread.php?t=369587

will do but im probably going to have it it the trunk bevause thats the only place it will fit. from what ive been told though even though it is big and loud its the best high performance pump for reliability and its rebuild able . the only other pump i have considered is the pump that vortech supplies with its superchargers. but i will try to get you some pics as well of my fuel line setup , im also going to still be using the factory evap tank.

i guess evap tank would be to cool down the fuel little bit?

some pics would be great when you get a chance. i like joel's idea so far. it seems the easiest and it makes sense to me.

All your talk about the fuel pump...don't forget you need to get the fuel from the passenger side of the tank to the drivers side...otherwise you will have only a 1/2 tank in reality......so you either need to keep the OEM venturi system intact...or run a transfer pump to get the fuel over to the tank with the main pump.

You also need to keep the OEM fuel level system intact so you have a working fuel guage

Track driving will mean you want a surge tank setup..or something that will ensure you have fuel in high G turns.....

Like I said before.. Everything in the tank stays the same, only the fuel pump should come out... Everything else stays Intact, so there are no complications at all...

So you are leaving the stock FPR intact....and the in tank pump...and returnless system?

the pump comes out, what used to be the main line will now be the return line. A new pick up will be made and a vuala....been there done that... And It works

what are you using to transfer fuel?

i think everything's been addressed by joel and moon. it's basically a stock system with inline external pump + true return. return line will be one oem line. and the other oem line will be the breather line.

i think the following should sum up joel's guide to true return system conversion for rx8's.

1. take out oem fuel pump
2. mount two bosch 044's (or some big pump) somewhere
3. route hose from plastic oem fuel unit to first 044
4. route another suction tube to the second 044
5. check valve in front of the second 044 to prevent backflow (second one will only come online when there's boost)
6. Y-two lines into one AN-10 line
7. send AN-10 to the rails
8. split with Y
9. connect to two fuel rails
10. aeromotive a1000 fuel pressure regulator
11. return fuel with the oem purge line through the evap
12. oem fuel line will be connected to the intake tube with some catch-can in between.

Im very bad with words man... Ill just take some pics and youll be the judge.. Im struggling here to explain

Sounds good... I do see something I might have to talk to you about, but it can be adressed over later..

i guess joel's guide to one 044 conversion for all 2rotor people would be:
1. take out oem fuel pump
2. mount 044 somewhere (moon recommends directly below the driver-side passenger seat to minimize lines)
3. route hose from plastic oem fuel unit to the pump
4. send ss-braided line to the front
5. connect to oem fuel rail
6. connect the other end of the rail to fuel pressure regulator (FPR)
7. return from FPR using the evap line
8. use the stock fuel line as breather line (connect to the intake pipe behind the filter)

I know that unless you address the fuel transfer issue you will have a problem on the track if you choose to go there. You also have to watch the second pump running dry when the fuel is below 1/4 tank...

If you aren;t going to track the car you will likely be OK

Just want you thinking about this in your design so you don;t have to re-do it later like I did

Just wondering.. What kind of power are you trying to make?? And what injectors are you using?? Sorry if you mentioned all this before, I just scanned thru..

right now, i'd have tears of joy if i can make 10hp :lol:

hopefully after the winter, 500whp at low boost. then i'll increase it gradually until she blows in california. then i may do 3 rotor NA or try out the bigger displacement rotors if they ever become available.

scott was very mysterious about all components, so i have NO clue what injectors i have. even when i posted the gt42r turbo pic with either the serial # or p/n before on the forum, he immediately had asked me to take it down, photoshopped out the label, then had me relist it on the forum. his explanation at the time was that he wanted to keep the component list a "secret". i have no clue why. maybe he stole the turbo from someone and didn't want him to ID it. feel free to check out my turbo pic that was posted on my prev thread. all labels had been blurred out using photoshop.

my retuen system is very simple. i went from the outlet of my fpr and ran a line all the way back to the filler neck routing the lines in the empty clips beisde the stcok lines. i marine texed 1/8" npt nipple to the top of the filler neck right beside the evap line. as for the feed line i have cut my stock line mid car and shot it over the the pass. side then to the fire wall. i was not aware of all the weirdness inside the tank. i was told that you could leave the stock pump in the tank and just hook up a inline pump to the line and i would be ok but i guess thats not the case?im interested to see how angel did his. as for a sending unit if you can get a ohm reading at empty and full you can just run a autometer gauge like im doing. i just dont know what the ohm load is.

scott was very mysterious about all components, so i have NO clue what injectors i have. even when i posted the gt42r turbo pic with either the serial # or p/n before on the forum, he immediately had asked me to take it down, photoshopped out the label, then had me relist it on the forum. his explanation at the time was that he wanted to keep the component list a "secret". i have no clue why. maybe he stole the turbo from someone and didn't want him to ID it. feel free to check out my turbo pic that was posted on my prev thread. all labels had been blurred out using photoshop


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Dude fuck that,,, the best builders on here have no problem sharing thier knowledge and tricks becuase they're confident in thier owns skills enough to know that not too many people can replicate it...

are you going to use a water meth system?--rotorys love a water meth system:)
Also with the angle of the oem radiator etc--we have found using a small secondary radiator mounted off the front bumper support to have significant affect on cooling.
I know you are not using the oem radiator but i though the angle may end up being approx the same.
with the shape of the nose/air cavity and angle of the radiator i have found that a "swirl" affect is happening in the top 1/3 portion of the rad.
even if you fill the front with your intercooler you can still horizontally mount a secondary on the bellypan.
Thanks for the fuel pump info
Dan I think the siphon affect is still there?
Oldragger

I had over heating problems... They where gone by changing my cooling fan.. By the way I do believe you are going to have cooling problems because of your turbo placement...