Does anyone on this forum using Apexi R33 GT-R fuel pump? How do you install it?

Thanks,

Sam

 

Rich (GoodfellaFD3S) uses it. Here:

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/some-fuel-system-ramblings-533171/

 

I am (will be) running the Nismo R34 GTR version and was told by the guys in the Japanese section to just take off the wiring from the OEM pump and connect it to the new one.

 

I've had the BNR32 in my car for a year or so after frying the Nippendenso at 13V constant.

What part of the install do you specifically want to know about? Look at the picture on the middle of this page and see if it answers some questions.

http://ourworld.cs.com/_ht_a/talvendi/id194.htm

The pictures are of the Nippendenso pump with braided line clamped to the pump discharge. The Apexi pump requires slight modification to make the Mazda fuel filter fit it's suction. On the bottom of the BNR pump there is a hole that looks like a relief of some sort so I made a hole in the rubber isolator and drilled a hole in the bottom piece of the braket in case it vents it won't be obstructed. I spliced the + and wires to stock plug and ran the extra ground to the pump bracket. Hose clamps hold the pump to the bracket.

Jack

 

Nevermind, forgot that I actually used the stock harness and attached in to the BNR. No splicing.

Jack

 

Hi Jack,

that's good to know. One of my next projects was to hotwire my supra (nippondenso) pump to the battery, but I have since picked up a BNR32. Based on your post, it doesnt look like hotwiring is the great thing others have made it out to be......

 

Serman2K - As luck would have it, I need to open my fuel tank to check the level sender today. PM me your e-mail and I'll send some pictures.

Rich,

The hot wiring burned up the Nippendenso in a year or so of use (pump had about 28,000 mi. before and lasted another 10,000 mi. or so). Rumor has it that this is common. I don't know if the Apexi pump can handle13V operation better but it moves so much fuel at 13V I know my needs are covered running it through stock wiring. Maybe one of the electrical guru's can give us the equation to predict pump output at reduced voltage based on the 13.2V test from Max.

When I first installed the Apexi, I left it hot wired for 6 months or so. It was loud (loud by in-tank standards) and idle was very rich. I've got a fuel pressure gauge so when I switched Nippendenso to Apexi with hot wire, I had to reduce static fuel pressure about 3 psi. When I removed the hot wire from the Apexi, static fuel pressure stayed the same.

Another interesting comparison test between the two pump was blocking off the return and checking the max fuel pressure per the Factory Workshop Manual (pulse power to pump and max pressure should be 71-106). My RP/Nippendenso went to approx. 110 psi and droped to about 28 psi after 5 minutes. The Apexi jumped to 140 psi and bleed to about 75 psi after 5 minutes.

Something else I noted in looking at this pump. From Max Cooper's test, the Apexi relief opens at 75 psi. When I sent my Nippendenso for flow testing, the report said its relief opens at 50 psi. Based on a base pressure of 38 psi, the Nippendenso will be operating under at full load when boosting 12 psi or more at the motor. With a higher relief pressure, the Apexi won't have to work as hard with all flow going to the motor and none through the relief.

I want to do do Chuck Westbrook's wire mod at some point to provide more power when the pump switches to high speed.

Another interesting mod I saw recently for those aflicted with the I've done every mod, what's to do next, was the BG fuel heat sink http://www.barrygrant.com/news/artic...oduct_005.aspx

Jack

 

jack,

thanks for all the further info. Perhaps post the pics for the install of the apexi pump in this thread for people performing future searches?

Also, do you have a link to chuck's wire mod?

thanks!
Rich

 

Pics to accompany my notes above.

 

My Apexi pump at 14 volts was loud too, but it delivered a ton of fuel. I will be running a nipendenso pump at 14 volts on my V8 conversion, we'll see how long it lasts.

If you are looking for Chuck's pump wiring mod just do a search on his sig, I think he posted it.

 

any other places to get the pump?

 

^ You can get the Nismo version from Japanparts.com or special order from Takakaira but since they charge a money fee and they don't stock it japanparts is best. You could probably get the Apexi version from Dynamic Motorsports in Laguna Hills, CA or XS Engineering in Huntington Beach, CA since they are both Apexi dealers.

 

http://www.autocarparts.com/advanced...4-A011&x=0&y=0

 

thank you mr. glass

 

Man, that's a deal!

 

That is a great price, but do they have it in stock? lots of internet sites will make you wait months while they hold your money and order the parts from their wholesale distributor.