Walbro 525 "Hellcat" F90000285 or 535 F90000295. The 535 flows a little more while pulling less Amps but it doesn't have a check valve while the 525 does. Make sure to buy from a reputable place as there are many knock offs that can fail.

 

a single Bosch pump?

That’s about 550 hp max at that boost level on pump gas assuming everything is absolutely perfect. Even with water/alcohol injection, you might be safer playing putin political challenger roulette with a 45 magnum and two bullets …
.

 

what was your system voltage when you were down on Diff FP?

and yes, your pump is a back in the day not up to the job piece. i am surprised you haven't run into fuel starvation on hard acceleration. i had it w 12 gallons onboard in third... i now have a Radium sump. i have a 267 as a lift pump and a 285 as primary. it wasn't able to maintain proper pressure (this was at 77%E) so i now have a 274 to supplement the 285. i have it programmed to come on at 5 psi. i also swapped in a DC Power 320 amp alternator as my V had dropped to 13.9.

it never ends

 

Thanks Mate, yes thinking of the above walbro without the check valve or the bosch 540.

I just need a pump to get me upto 26psi lol

 

There was a slight drop in voltage per the above log, voltage normally holds at 14v but dropped to 13.85v.
Indeed i think from the flow data neit posted the walbro 535 without the check valve looks like what i need.
I use the feed baffle so have avoided fuel starvation but whenever i do draggy runs i'm always running a full tank of fuel to prevent starvation issues. That being said even when i've had less than half a tank to 1/4 tank I've not had any fuel starvation issues.

In fairness the radium setup does look good. Will it work with 2x bosch 540's or Walbro 535?

My fuel injectors are running at 100% duty at 24.4psi boost, so need something bigger to address that as well.

Like you said it never ends!

 

Where is the 320 amp alternator? I thought they only make a 180?

 

WOSP make a 320. Just about to try one on my FD

 

The Radium setup can be ordered to use various brands of pumps even brushless. Mine is setup for Walbros and can run 3 Hellcats (525 or 535) plus the lift pump. Currently I run a Walbro 450 HP F90000274 as lift and a single 525 F90000285 to the engine. Planning or running pump fuel + w/m for 550-600 whp

 

if you are running modeled fuel and your diff fuel pressure is cut 50% your injectors may be be directed to compensate so if you can steady diff fuel pressure you may have enough injector. or not.

what do you have as far as injectors?

you do need more amps if you see anything below 14 V. after i found 13.9 on the dyno i added up my elec draw. the typical 220 amp alt wouldn't quite cut it so 320 was the call. i did some research and decided on DC Power. of course 320 isn't cheap, around $600 as i recall, but i won't have to be concerned about amps going forward. not everyone needs 320 and the 220 amp alternators are significantly less expensive.

as to fuel pumps, i like brushless, which works fine w the Radium, but i already had two Walbros so it was pretty easy (read inexpensive) to just add another smaller Walbro.

 

@Howard Coleman is the 320 amp the exact same casing as there other DC FD alternators? It looks identical to my 180 but sometimes pictures are deceiving. 320 is crazy!

 

The part # on that alternator seems to indicate 180A?

 

Surely that stud and your wiring and engine grounds start to become a serious problem from a heat/resistance perspective at that point?

Would a single brush less pump and modest lift pump not be more sensible?

 

"wiring and engine grounds start to become a serious problem from a heat/resistance perspective at that point?"

as you probably know, an alternator only outputs what is needed. my wiring and grounds were fine running almost everything. given my setup, my guess is i won't need much more than 220 A with everything on but i prefer not to roll the dice. i do agree w you that wiring might be an issue at 320 but i won't ever be there.

as to brushless, if i didn't already own my brushed pumps, yes, i would have gone that route.

"is the 320 amp the exact same casing as there other DC FD alternators?"

i don't know for sure on this... i will say i am very impressed w DC Power...they have quite an operation. Anthony is the guy.

"The part # on that alternator seems to indicate 180A?"

yes, it is 320

 

Howard, i would be interested in a 320amp alternator. Do you know if this part can be shipped to the UK?

Is it plug and play with stock wiring etc?

 

"Is it plug and play with stock wiring"

yes, they give you a 4 inch connector wire w the appropriate plugs.

as to UK shipping, you'd have to inquire but i am pretty sure they ship global.

https://www.dcpowerinc.com/collectio...rt-alternators

sales@dcpowerinc.com

 

If you are in the UK

Buy WOSP , they are local to you and since DC Power screwed me around I have been buying from them, their quality is excellent and their service is outstanding.

Significantly better company to deal with over DCPower

DC Power stuffed me around for 6 months for one alternator and then refunded my money and said to go elsewhere cause I got upset I had waited 6 months while other people are waiting 3-4 weeks to get their unit.

 

Thanks for the heads up Omar. I'll get it from WOSP. Do they do an FD specific one?

 

They sure do FD Specific and they do a 175AMP and a 320AMP.

I have tested both and they are flawless. Full billet units as well.

 

I was going to get the TI duel pump setup, but after finding the new FueLab brushless pump, I think I will go with this and be done with it. Since I do not already have the Radium and multiple pumps, this FueLab seems to cover all bases in 1 complete package. Less wires, gas lines, inputs from ECU. If I am doing my math correctly, if I want to run up to 30 PSI adding to 43.5PSI base pressure is ~75PSI. Need another 30 PSI from the pump to offset the differential fuel pressure so that the injectors at the rail are getting 75PSI, so the pump needs to output 105PSI. This pump looks to be able to provide ~275GPH at 105PSI.

https://fuelab.com/i-285-1100lph-twi...kit-20815.html

 

why would you want such a high base pressure? That's running the fuel pump well out of its efficiency range, this results in HOT fuel in a short period of time.

I have always preferred low base fuel pressure with more injectors.

 

I'm not sure your or my math is mathing?
you want to run 75psi base fuel pressure at idle? or the standard 43.5?
plus max 30 psi boost, right?

This is how I math my fuel pump: 45 base + 30 boost + 15 (lines and filter loss approximation) = 90 psi max and about 300 lph needed in my case which the 285 Hellcat provides with some extra buffer

And on the topic of alternators, I run a 200 A unit from excessiveamperage.com , stock case drop in install. In case 320 is too much for some.

 

While we are on the topic of base fuel pressure, I think i need to reduce my base fuel pressure back down to 45psi, (currently at 63.5psi to gain net fuel delivery but outside pump efficiency) and see if the pump will get me upto 26psi.

Although i suspect i will be out of injectors and need to add bigger injectors as well.

You can see the differential fuel pressure dropping off below.
Analyzing the 6.15-second draggy run reveals some potential for improvement. I'll share my insights for discussion purposes.As always, it's recommended to consult with your tuner and builder.

Upon reviewing the data, it's evident that there's untapped potential, particularly with regards to the fuel system. Addressing the fuel pump and possibly upgrading the injectors could yield hopefully better gains and get me into the 5s 100-200 range which would be amazing with a bloody g35 1050 and a streeport on pump fuel! Quite a modest build imo which any fellow FD owner can copy without breaking the bank.

It looks like this run can be further optimized, leaving room for enhancements. By increasing the boost average by approximately 1.5 psi (i.e. average 24psi across the rev range) and refining the air-fuel ratio (AFR/lambda), maybe just maybe there are some more performance gains to be achieved.

I really want to get the G35 1050 to 25-26psi and see how it goes via the Draggy 100-200..

 

If you have an aluminium intake elbow you may find you can reuse factory rail and injectors by getting someone to weld on and machine a boss to get you where you need to be without redoing the whole system.

 

I should have been more specific. Base pressure of 43.5(or 45) +30 PSI boost with a 1:1 Pressure regulator. After speaking with ID Injector and FueLab, they also added in Differential Fuel pressure. When speaking with them, in order to achieve 75psi rail pressure(45+30psi for boost), you also have to add the same 30PSI on top of the 75 as the differential pressure that the pump outputs or 105PSI pump pressure. Maybe I understood them wrong, but I asked several times to make sure?

Regarding hot fuel, I would agree and assume that as you raise the PSI demand on the pump, it increases heat. I dont necessarily know what the efficiency range of the FueLab pump is directly, but when I spoke to their tech he was not concerned at running the pump at 105PSI. Link to Tech specs below. Show that the pump has a max of 125PSI. This is the same pump that Rob Dahm used in his recent Tii ~700rwp video.

https://fuelab.com/files/attachments...-fuel-pump.pdf

 

interesting! so they recommended 30psi as extra for pump losses it seems, similar to what I approximate at 15psi
I suppose the only sure way to know is to measure pump output pressure and fuel rail pressure and it will vary a lot depending on lines and rails (length and size and #of bends) and fuel filter and accessories like dampener and regulator, etc.