aaronbc

I finally received my fuel pump (TI Automotive/Walbro F90000285) and it's not going to fit in the basket without some major modifications. Before I start hacking it up I have a some questions I was hoping to get answered:

This is for a 2004 model 350z/G35C

1) Is the 525lph the same physical size as the 485lph in which this install guide will apply? https://my350z.com/forum/forced-indu...x-haltech.html

2) Will the stock strainer still work with this longer pump?

3) How large should I drill out the swirl jet port?

4) I have the CJM S1 return fuel system and upgraded wiring and am preparing for a Vortech SC install (Low compression forged internals, 1000cc injectors). This fuel pump is probably more than I'll ever need, should I return it and get a smaller 340lph pump that will fit better in the basket?

Thanks!
Aaron

thatv35guy

iTrader: (1)

1. Yes, the 525's physically the same size as a Walbro 450/485.
2. I used the filter/strainer that came with the 525 install kit.
3. I drilled out the swirl jet to .100” (#38 drill bit).
4. That depends on how much power you want to make and if you're running the car on E85. If you're shooting for 600whp on E85 a 340 pump won't cut it, the 525 probably wont either. I'm using a 525 and a voltage booster (Kenne Bell Boost-A-Pump) to make mid-high 600's on E85.

bealljk

iTrader: (13)

What V35 said...

I couldnt get my fuel strainer to fit and I did not install it but I did install a large filter on the fule line up near the fuel rails in lieu of the strainer.

Yea, .1" is good ... if you have idle'ing issues and you suspect its fuel related than open it up a little more but .1" should be good. Hopefully Conway will chime in and share his experience as he needed to go back and enlarge the hole.

How much power are you looking for?

and by upgraded wiring do you mean the relay kit?

If you need further help post up here we can help ... I've done this 525lph swap twice on my car and a handful of times on other cars

aaronbc

Thanks for the info.

I'm initially going to run the Vortech with the smaller 2.87" pulley. I have low compression pistons 8.8:1, no cam or header upgrades, so wherever that gets me in hp... I'll be happy.if it just doesn't blow up on the dyno

Yes, I added the relay kit with 12 gauge wiring.

Thanks for the help, I guess I'm going to keep this pump and start chopping it up, here goes nothing.

thatv35guy: I'm surprised that the 525lph is not enough for 600whp,

thatv35guy

iTrader: (1)

Above 17 psi on my 6266 turbo my Walbro 485 would drop fuel pressure in boost, the 525 might've held a few more psi than the 485 but it wasn't worth the risk.

OldManZ350

iTrader: (23)

The Walbro HelCat 525 is Rated at 900whp on Gasoline, V35guy was talking about E85 that required about 40-45% more Fuel volume compared to Gasoline.

Also depends on the fuel line size you have. Small fuel lines will restrict flow.

Conway_160

iTrader: (1)

Like Bealljk said, i had to drill out my hole a few different times to get my idle pressure to where I needed it. The gold is to keep the hole as small as possible it help with the venturi effect pulling fuel from the other saddle bag over. I'm not sure where at in my build I had to deal with it sorry.

bealljk

iTrader: (13)

here's my install setup - if you have questions just post them up...plenty of smart and/or intelligent members

I think it's post #625 I started at … enjoy!

0taku

iTrader: (5)

Get a DW440 fuel pump.

They’re tiny, and have their own boost a pump feature.

They also blow away the hellcat pumps. I really wanted to try it, but I already got lucky and have my hands on a CJM twin pump.

One thing you’ll learn is how thirsty a car can get with E85. (Vortech Superchargers makes it worse lol)

I hoping my 450/255 and 2200cc injectors will handle 900hp at the end with nitrous.(dry.... ALL THE FUELS)

I doubt your car will blow unless the tuner is extremely questionable .

aaronbc

Link?

bealljk

iTrader: (13)

ooooppppppssssss….
https://my350z.com/forum/forced-indu...-build-13.html

OldManZ350

iTrader: (23)

Anybody want to give details about the Relay used and how you wired it in.

Conway_160

iTrader: (1)

This is how I wired in my pump. I used a 40 amp relay from auto zone. https://www.autozone.com/electrical-...lay/849395_0_0

Pin 30 gets a 8 or 10 gauge 40 amp fused wire from the battery to the relay.
Pin 86 is the OEM fuel pump power wire.
Pin 85 Is a chassis ground.
Pin 87 goes to the fuel pump this does not have to be as big as the pin 30 wire since it is much shorter, but it wont hurt to be same size as pin 30 wire.

To test that you have done this correctly do the following.
Apply ground to pin 85, and touch pin 86 with a 12V source. You should hear and feel the relay kick.

Next grab a multimeter, and attach one lead to pin 30 and other to pin 87. With no power attached this should read open or "OL"
With power leads still attached to relay, ground out pin 85 and attach 12V to pin 86. This should kick over the relay providing a connection between pin 30 and 87.

The fuel pump also now use a chassis ground instead of the factory harness ground. The shorter the wire the better.

aaronbc

Here's a video that helped me: He does awesome work.

bealljk

iTrader: (13)

It's laid out pretty clear in my post ... if I remember right V35 and WTFMike helped me out quite a bit ...

OldManZ350

iTrader: (23)

I purchased the 525 Helcat Pump, but not Installed.

My biggest concern is that I will run out of Fuel.

The Street is not a problem, it will be very detuned maybe 26psi on pump gas.

At the Drag Strip I'll be Running VP Q16 & it 9.41% Oxygen.

Drag Setup: VQ35DE, 11/1, V7- YSi-Trim, 32, may as much as 36 psi with my front mount 5 inch bell mouth intake.
I'm expecting 800- 850whp min.....

Thought?

bealljk

iTrader: (13)

Run out of fuel or run out of fuel pump capacity?

I think you'll be fine - especially since youre using Q ... You may want to peruse the top 50 FI builds and see what other people are using (for fuel pump capacity) and what HP figures you are making ... I bet you'll see that 800hp to 900hp builds are using the CJM twin pump setups with dual 255 and you'll

am I hearing you correctly?? 26psi on pump gas and 36psi on Q16? Is Q that that that stable? I hope one day I grow the brass ***** you have OMZ - I'm curious to see what your ignition timing values are!

OldManZ350

iTrader: (23)

Yes, you here me Right!........ Remember it a Supercharger and they Suck up Fuel Like Crazy. I'm Concerned the Pump will not pump enough Fuel.

0taku

iTrader: (5)

Them dang thirsty Superchargers.

I think 800-850 is being awful humble for numbers Tim lol. Maybe, just maybe on a mustang dyno.

OldManZ350

iTrader: (23)

Maybe so! But I don't want to predict some crazy Hp Numbers and not reach them.... LOL