Driv200

iTrader: (1)

Hey guys,

I am looking to upgrade the last stock oem parts of my track car....the fuel system. Aside from external surge tank and larger fuel pump, I am on OEM everything for fuel and ignition.

I run a 2.4, FP Red, e85, around 550HP.

curious what works for track cars:
* fuel rail
* duel fuel pumps
* larger diameter fuel lines
* flex fuel program
* upgraded ignition / spark

Balrok

iTrader: (15)

All of that pretty much works as designed. You could likely even use a single Warblo400 if you're pushing that much power on OEM stuff. Kevin can hook you up.

LetsGetThisDone

iTrader: (1)

Your current setup works, why are you changing it?

Driv200

iTrader: (1)

It's not working currently. At my one day COTA event...drove 7hrs....my car crapped out on lap one. Right at boost, it made this weird flubbering noise and the lower left yellow engine message light started flashing. It was some kind of limp mode I guess? Assume my new turbo set up is maxing out the oem fuel system. Probably just a tune issue. Car works great around town, but seems to have issues right before track days. Trying to elimintate all the variables.

LetsGetThisDone

iTrader: (1)

Your fuel system works fine because the car went on the dyno and made the power it made. If you're getting a hiccup now, you need to diagnose the issue and replace what broken, or it's possibly the tune. No need to throw a bunch of parts at it.

EVO8LTW

iTrader: (41)

Have you asked your ECU tuner? If you mess with the fuel system, you’ll need a retune anyhow.

honda-guy

iTrader: (55)

550 whp is a lot for track. you'll probably run into engine heat issues. 550 whp is also going to use a lot of e85, how are you bringing that much to the track. when i had my 2.2 with fp red bb, it was making around 480 whp on pump gas, i only ran on that tune for a few times on track for TT, so just a few laps, not entire 20 minutes session. stock ignition, walbro 250 pump and 1050cc injectors.

when i switched to e85, i went with walbro 450 pump, rewire for dual voltage. ID 1300cc injectors, all stock fuel line.

EVOizmm

iTrader: (10)

single 450 pump and stock ignition will take 550hp. you aren't maxing out either of those yet, your problem is elsewhere.

Kidloco51

iTrader: (32)

I had horrible luck with Walbro 450's. One took a ****. The other unseated under pressure (install fault). Other than that they flow plenty.

Dallas J

iTrader: (1)

Back when I was dealing with Aeromotive pump failure and wanted to get back to the trusty Walbro 255 I researched what caused the biggest head loss in the fuel system. If we reduce head loss, pressure at the pump decreased for a given pressure at the FPR and of course looking at pump curves shows they flow significantly more.

The biggest restriction is at the pump housing and outlets to the main line. Theres a lot of flow direction changes and a direct line fixes a lot of that.

Number two is the combo of flex line and fuel rail. Move to a braided line a better fuel rail helps a lot.

Third, The main line is 5/16 so going to a -6an (3/8" line) is an increase in area of 44%. Though its all straight so their isnt too much headloss in the line alone.

Im at 500hp with a basic walbro 255hp with bypass punched.

Bee-Raddd

Definately get flex fuel. Can save ur engine. and allows for more accurate tuning as it can be adjusted for octane levels.

you want to go to individual coils. i use AEM smart coils. i found i was blowing the spark out at anything above 27psi boost. the coil packs are actually quite weak spark in comparism.

I use a walbro intank to feed my surge tank and then 2 bosch 044s but im on E85 ethanol fuel. I got away with 1 bosch 044 up to 420kw atw which i believe is like 600hp?

I also used 1/2 hardline under the car for fuel lines and teflon braid up to engine and up to fuel sys in boot. much cheaper than using braided lines the whole way. i Teed the twin 044s back into 1 line which is essentially dash 8. then it splits to 2 dash 6 lines to feed either side of the rail to ensure even fuel distribution. u need minimum dash 8 for return

If u do bigger injectors u may aswell do a rail at the same time.

One part uve forgotten is a fuel pressure regulator. which ull need if u go to alternate fuel.

LetsGetThisDone

iTrader: (1)

lolwut?


Stock fuel rail, lines, FPR, etc are fine for his power level. My car makes 500+ with only 1650 injectors and a walbro 450 in tank pump at about 80% idc. So I have fuel for around 600.


I've been around cars that make 800whp with only a drop in Buschur double pumper (2 walbro 255's) and 2000cc injectors, and every other fuel system part is stock. Don't over complicate things.


Regardless, op is having an issue with the car that is either a part failure, or tune issue. It's not because his fuel system isn't up to the task.

Dallas J

iTrader: (1)

Well thats not really true. Certainly have more overhead but it wont scale like that. To get to 600hp you'll need more boost which moves you further on the Flow vs pressure graph. More pressure means less flow means less potential.

More pump is certainly the easy button to overcome the Flow vs pressure and a 450 or double pumper will make anything else needed pointless. But if you want to run a 255, itll take other things to bring that pump pressure down (due to headloss).

LetsGetThisDone

iTrader: (1)

The 450hp doesn't fall off as bad as the 255hp's do. Cars have made over 600 with the setup I have.

RazorLab

iTrader: (8)

Just make sure you get the higher crack pressure 450. F90000274 vs F90000267

F90000267 starts opening at 85psi

I believe F90000274 is 110psi +