RB25 Haltech and Fuel System Upgrades

[Darius]

I haven't done anything major to my engine for a couple years and was semi-content with 420 rwhp. Last fall, one of my DW 650cc side feed injectors decided to short itself out and DW no longer carries that injector size. After much debate, my friends convinced me to convert to E85 instead of simply replacing the sidefeeds. I was going there eventually, so why not just go all the way now?

With the fuel system conversion came top feed injectors (DW 1200cc low-impedence), custom top feed rail (by me), -8AN fuel supply line, -6AN return line, PTFE flexible lines and fittings, a SARD FPR, wire the fuel pump with 10GA wiring, Fuelab 41402 fuel pump, Fuelab 75 micron SS sock, and Fuelab 6 micron synthetic fuel filter/check valve assembly. I'm still waiting for the fuel pump to arrive...

This is how my fuel rail is set up:










Removed the dinky fuel supply, return, and EVAP lines. Relocated the rear brake line.








Modifying the stock gas tank cover to accept -10AN and -6AN bulkhead fittings.







Along with the fuel upgrades, I decided to change out the PowerFC for a Haltech Platinum Pro Plug-in EMS and convert the RB25 over to MAP. Currently, it is wired up and I have most of the settings input into my tune.





And don't forget the new intake filter and 4-inch elbow. I'm excited to get rid of the BOV recirc hose!!

[Carl H]

nice, i had noticed you were missing a maf and was like hurm...i dont think he's on blowthru.

[Darius]

Nope, I graduated to big-boy status

[Carl H]

i hear ya, im looking into going to an aftermarket ecu and redoing fuel lines to support e85 as well...mainly for long distance driving.

[Darius]

For my fuel lines I bought 6-foot long, straight sticks from McMaster-Carr for $12 each. SO much cheaper and higher quality than the overpriced crap you can buy rolled up from Earl's or whoever. I bought a RIGID 37* flaring tool and it is kick a$$! It flared the lines to perfection every time!

[Carl H]

gotta love mcmaster, they sell everything.

[Shocker]

Looking good Matt, have you started driving it yet with the Haltech?

[Darius]

I'm still waiting on my fuel pump. It is supposed to arrive next week, so until then I can't do much. My main setup settings are complete, I think. I'm still a little foggy on setting the closed loop boost duty table and how that corresponds to the overboost pressure setting.

[Carl H]

i thought the -an flare was 37* while sae flare is 45* why did you go with 45?

[Darius]

i thought the -an flare was 37* while sae flare is 45* why did you go with 45?

My mistake, it is 37*. Fixed.

[RRRRB]

boost control with haltech is kinda tricky, its got to many damn settings.. but it does work once you figure it out

[RRRRB]

What kinda power are you shooting for with this new setup?

[Darius]

I'm going for 700 whp.

[RRRRB]

when you planning on getting this thing on the dyno?

[Darius]

We don't need dyno's in Iowa hahaha jk I'll get it on one soon enough. I have a lot on my plate right now and the car is taking a lower priority now that it is mobile.

[RRRRB]

Haha, yeah i wish i had E85 here, its around every 50 miles or so, but thats just not enough for me to make the jump, not to mention i cant imagine how bad fuel economy is probably have to carry some with ya... good thing its cheap!

I should have my car on the dyno in the next month or so im hoping for around 700-750whp

[Carl H]

i just realized that you removed the jet valve...how are you planning on getting the tank to fill properly?

[Darius]

i just realized that you removed the jet valve...how are you planning on getting the tank to fill properly?

I have no idea what that thing does. I took it off and drilled it out. How does that affect how the tank fills? I filled it up on E85 without any issue.

[Carl H]

oh you can fill the tank just fine but the problem is that it is needed to get fuel from the other side of the saddle to the pump side.

[240z4u]

I am interested to hear this. Where is the jet valve? Is it for the fuel return?

Thanks Carl!

[Darius]

$hit. So you're saying the return line jet valve serves as a venturi for a fuel suction line on the driver's side of the fuel tank? I was wondering what that thing did. I thought it was related to the fuel tank EVAP system.

[Carl H]

the jet pump is the little 'top' looking thing on the s14 tank hat, and yes you are correct it serves as a venturi pump powered by the return line.
i had no idea what the thing was either until i did some research into fuel pump configurations when i mounted my bosch 044 in tank.
sard makes a device which you may be able to adapt into your setup called the jet pump killer, its about 100$ but is a larger metal version of the stock pump which is supposed to be able to flow more than the stocker could ever hope to.



overhead shot of the tank:


you can see the ventui pickup in the upper left hand corner.

[Darius]

This kept me up last night and I have determined that a venturi is not going to work for my setup. I am looking at installing a small transfer pump to pull from the driver's side. I have an old S14 pump, but I think this is too large for what it needs to be. It really just needs to move a little fuel at a couple psi of pressure. That suction line is about 5/16" ID with 1/2" OD. The real fun begins when I go to transition from rubber hose to teflon hose :\ Stay tuned.

[240z4u]

I am almost sure I left that thing in there, I need to check.

[Darius]

Here's my $20 solution:

It is a little 12V electric pump probably made in China. Search for model number E8016S and there are several manufacturers with the same pump at different price points. Summit had it for $48 (Airtex). Ebay had it under another brand (Herko) for $19. Hopefully this will work. I'm ordering more fittings from anfittingsdirect.com to connect to the teflon line I already have installed in the fuel tank lid. I'll just extend the existing rubber suction line to the pump and go from the pump to the tank with braided teflon.

http://www.ebay.com/itm/160812160373?ss ... 1497.l2648

[Carl H]

looks like a good idea to me, doesnt need to be high pressure as its just moving fluid from one side to the other.

[Darius]

Yeah that thing is a baby. I think it said something like 4 gph. If I need to transfer fuel to the passenger side faster than that, I'll just powerslide left.

[RRRRB]

so do you have this thing street tuned yet? wanna share maps?

[Darius]

I barely have it really street tuned yet. It runs smooth but I need to re-do a bunch of stuff to get it to run right and have the settings setup correctly, not just fudged in there. I just moved to Chicago and have been busy packing and moving for the past few months. I can look at your tune/settings and make comments if you want?? Mine tune is rough and I wouldn't want to screw up yours. Feel free to e-mail it to me though.

[RRRRB]

i was just curious, mine idles drives and runs great, took alot of messing around to get it working right.. im Using and RB26 cylinder with ITB's so our fueling maps would be very different as mine is TPS based with a MAP correction added for boost.

I was more curious on how close our ignition maps were... i can send it to you anyway if you wanna check it out...

PM me your email if you wanna check it out