JUST a Walbro ok?

[Biff]

Howdy folks.

Right now I run my GReddy kit at 6.5 psi, properly tuned (I have an E-Manage and a Profec E-01....and a laptop and the E-Manage software).

HOWEVER. I'm still running the stock fuel pump and stock injectors. Now at my set peak boost (6.5), it runs just fine up until about 6800rpm and up, at which point I hear slight hints of detonation. Injector duty cycle is around 70% at this point (monitored through the E-01), so I don't think they're really struggling. Though I reckon the fuel pump is the weak point.

Say I were to buy a Walbro. What else would I need? Is there anything else I need? Or can I just drop it in? Do I have to alter my fuel map if I still want to run just 6.5psi? Will I NEED a FPR? Like, absolutely necessary? Or will just the pump be ok for the time being?

edit: D16Y8.

[jdmhonda98]

i think the stock pump is getting weak at high rpms and cannot deliver i would put the walbro 255 and try it out before tuning cause i think its starving for fuel at topend. You dont have to alter the fuel map because once the fuel rail is full of fuel the rest goes back into the tank.

[b16ahybrid]

oops double post, I tried to edit my post but somehow re-posted, oops..
see below....

[b16ahybrid]

"Howdy folks.

Right now I run my GReddy kit at 6.5 psi, properly tuned (I have an E-Manage and a Profec E-01....and a laptop and the E-Manage software).

HOWEVER. I'm still running the stock fuel pump and stock injectors. Now at my set peak boost (6.5), it runs just fine up until about 6800rpm and up, at which point I hear slight hints of detonation. Injector duty cycle is around 70% at this point (monitored through the E-01), so I don't think they're really struggling. Though I reckon the fuel pump is the weak point.

Say I were to buy a Walbro. What else would I need? Is there anything else I need? Or can I just drop it in? Do I have to alter my fuel map if I still want to run just 6.5psi? Will I NEED a FPR? Like, absolutely necessary? Or will just the pump be ok for the time being?"



Yeah the pump will drop rite in. I would check your afr after the install, since the pump provides more fuel it may be a litle rich throughout the power band. Are you still running stock honda 240cc injectors? or did the kit come with larger ones?

[Biff]

I'm still running the stock 240cc injectors.

Also, the D16Y8 is a terminal fuel system. There is no return line.

Obviously it will supply enough fuel at high rpm, but I'm curious if anything needs to be done for idle. Cuz that pump is gonna be spewing lots of fuel at idle.

[b16ahybrid]

Originally Posted by Biff

I'm still running the stock 240cc injectors.

Also, the D16Y8 is a terminal fuel system. There is no return line.

Obviously it will supply enough fuel at high rpm, but I'm curious if anything needs to be done for idle. Cuz that pump is gonna be spewing lots of fuel at idle.

As long as you get the regular 255lph fuel pump and not the high pressure pump you should be fine. your idle pressure should be close to stock, i've not heard of a regular 255lph pump raising the static fuel pressure. YET

[Biff]

Originally Posted by b16ahybrid

As long as you get the regular 255lph fuel pump and not the high pressure pump you should be fine. your idle pressure should be close to stock, i've not heard of a regular 255lph pump raising the static fuel pressure. YET

Regular 255 and 255 high pressure?

255 liters per hour is 255 liters per hour. How can there be a pump that pumps that one pressure, and another a high pressure? It's the same amount of flow. Unless you're talking about the 190 lph pump.

Also, I've never seen a regular and high pressure 255 lph pump from Walbro. Just the 190 and 255.

Anyone else have any answers?

I just want to know if I can drop the 255 right in without it affecting my idle and everyday driveability, WITHOUT have to retune anything.

[b16ahybrid]

Originally Posted by Biff

Regular 255 and 255 high pressure?

255 liters per hour is 255 liters per hour. How can there be a pump that pumps that one pressure, and another a high pressure? It's the same amount of flow. Unless you're talking about the 190 lph pump.

Also, I've never seen a regular and high pressure 255 lph pump from Walbro. Just the 190 and 255.

Anyone else have any answers?

I just want to know if I can drop the 255 right in without it affecting my idle and everyday driveability, WITHOUT have to retune anything.

There is a 255lph fuel pump and A 255lph "High Pressure" pump designed to work in high pressure condition created by a fmu.
Trust me I have a 255lph "high pressure" pump. it's the same except it flow doesn't drop off as fast as the reg. 255lph. It's all about the amount of flow at higher psi.

A fuel pump will not pump the same flow at 100psi as it will at say 60psi. I believe they flow test pumps @43psi so yeah both pumps will flow 255lph @43psi. once it gets higher say 60+psi thats where the HP flows more while the other pump drops off.....
You can say a 255lph pump is a 255lph pump thats like saying a turbo is a turbo or 10psi is 10psi...there is so much more to it.

[Biff]

Thanks dude.

The 255lph Walbro it is.