Stahe3- Walbro 450 stock wireing, stock injectors, 5 bar fpr?

[f4m0u5]

Will the 450 be ok on stock wireing if im runing stock injectors at 5bar on a stage 3- tune? My tuner asked for wategates set to 14psi and fpr at 5 bar.

I want to do my fuel pump to be safe for my stage 3- tune coming (my stage 2 tune was pushing my injectors to max and i think it was because of fuel pressure on older pump) but i dont want to go with stock(i plan on full stage 3 on the f21 mix flows at some point), but dont know if the 450 will be too much for now with the full wireing done to it. I heard alot about idlenfuel pressure creep and what not.

[Mocke]

450 draws over 20Amp, Calculate yourself.

It will but you are risking firing up your car.
You need to wire that properlly.

[f4m0u5]

450 draws over 20Amp, Calculate yourself.

It will but you are risking firing up your car.
You need to wire that properlly.

Ok thanks,

Is there gunna be a problem running the 450 with wireing on a stage 3 - with stock injectors? I read online about idle fuel pressure creep and what not

[gmdiluca]

Hard wire it. It's super easy and you can buy a really nice harness from racetronix. The walbro 450 moves a lot of fuel volume for the stock rail. I measured my fuel pressure to be 65psi at idle. When in reality it should be high 30's psi at idle with 20 inhg of mercury, so that's that.


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[julex]

The right pump for your set up would be DW300 or aeromotive stelath 300 model, that's unless you're talking E85. This way you won't have issues with wiring or fuel pressure creep.

[f4m0u5]

I hought i read that about idle pressure... 4bar fpr should push 52psi at idle with -20in/hg not high 30s (unless u have a 3 bar)

Im not talking e85, just looking to make close to 450whp with 93 and water meth injection , Or ms109 race gas.

[vavJETTAw36]

Hard wire it. It's super easy and you can buy a really nice harness from racetronix. The walbro 450 moves a lot of fuel volume for the stock rail. I measured my fuel pressure to be 65psi at idle. When in reality it should be high 30's psi at idle with 20 inhg of mercury, so that's that.


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Huh? At idle it should be the pressure of the fpr rating. 4 bar = 61psi regardless of pump.


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[gmdiluca]

Huh? At idle it should be the pressure of the fpr rating. 4 bar = 61psi regardless of pump.


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Oh sorry I may be incorrect. I thought I was told the fuel pressure should be 4 bar at 0psi .

[gmdiluca]

The right pump for your set up would be DW300 or aeromotive stelath 300 model, that's unless you're talking E85. This way you won't have issues with wiring or fuel pressure creep.

Didn't you post a link in another thread of a FPR with a larger Orpheus on the return side? This helps prevent boost creep yea?

[slow ride]

What have you guys measured for idle fuel pressure on a stock wiring? At 4 Bar the pump pulls ~15A at 12 volts (I ASSume pump voltage to be in this range with the car running on stock wiring) so at idle and light throttle the engine vacuum should reduce pressure even more and draw less current IF the FPR can keep up with a stock wired 450 pump.

[gmdiluca]

What have you guys measured for idle fuel pressure on a stock wiring? At 4 Bar the pump pulls ~15A at 12 volts (I ASSume pump voltage to be in this range with the car running on stock wiring) so at idle and light throttle the engine vacuum should reduce pressure even more and draw less current IF the FPR can keep up with a stock wired 450 pump.

With my pump wired to the battery I got 65psi of fuel pressure just before the rail at idle (20inhg) 4bar is 58 psi

[f4m0u5]

The right pump for your set up would be DW300 or aeromotive stelath 300 model, that's unless you're talking E85. This way you won't have issues with wiring or fuel pressure creep.

So the dw330 can handle 450 the the wheels just not e85 compatible??

Do i just buy it with a universal install kit? Anything else needed to install it besides the o rings to hold it in the stock cage?

[f4m0u5]

With my pump wired to the battery I got 65psi of fuel pressure just before the rail at idle (20inhg) 4bar is 58 psi

At idle with -20 in/hg it should be at 51 not 58 . So ur not just 7psi over your like 14 psi over (or 1 bar)

[CJ_]

At idle with -20 in/hg it should be at 51 not 58 . So ur not just 7psi over your like 14 psi over (or 1 bar)

Yeah I'm in the same boat, 450 pump hardwired with 10 gauge wire, 4 bar fpr, 65psi at the rail with the vacuum line connected or disconnected.. It was stated in another thread that it could be because the stock return lines are too restrictive for the pump

[julex]

Didn't you post a link in another thread of a FPR with a larger Orpheus on the return side? This helps prevent boost creep yea?

yes, the stock FPR has a very small return hole. Thus the pressure must reach a certain level at which this hole is capable to evacuate all the fuel the pump can supply at that pressure. The graph looks kind of like econ 101 supply and demand graph in that respect.

I don't have any pressure creep problems with my hardwired 450 because I have aftermarket FPR which huge orifice (haha!),

[slow ride]

I think the main problem is the small orifice of the stock regulator. FPR overrun is the main reason I did not rewire my pump and the fact I didn't need all the flow of a 450 pump. I'm just curious if I have any overrun as it sits now so I guess I can measure pressure when the car is back together.

[gmdiluca]

yes, the stock FPR has a very small return hole. Thus the pressure must reach a certain level at which this hole is capable to evacuate all the fuel the pump can supply at that pressure. The graph looks kind of like econ 101 supply and demand graph in that respect.

I don't have any pressure creep problems with my hardwired 450 because I have aftermarket FPR which huge orifice (haha!),

Link to this aftermarket FPR

[julex]

Link to this aftermarket FPR

Well, in my case it is custom fuel rail, lines and FPR so link would not really help you any... but it is AEM 25-302BK. Look at 034 fuel rail and their FPR offering, maybe there is something plug-and-play they have since my set up is very one off.

There might be FPRs out there that fit in stock location but I am not aware of any specific products either.

[f4m0u5]

So the dw330 can handle 450 the the wheels just not e85 compatible??

Do i just buy it with a universal install kit? Anything else needed to install it besides the o rings to hold it in the stock cage?