neoVVL

Hey guys, I'm looking for some help sorting this fuel system out. Set up is a 02 z06 with v3si 3.8 pulley along with cam and headers. Shooting for low to mid 600whp. The issue is I want to keep running e85 but im afraid my current system isn't up to the task. It was loosing fuel pressure before I added the bap, I'm not sure if it's going to be enough. (340lhp pump and kb bap)

I was hoping there was an easy/good option duel in tank fuel pump set up but I haven't really been able to find any. Do you guys have any set ups you'd suggest? If in have to I'll just go back to gas and re tune until I get it sorted out.

thanks for the help!

chris308

I am literally looking to run the same, mid 600 on my 99. What I plan to do is switch to a return style fuel system, and run Lonnie's double pumper with 2 255lph intank pumps (good for 800hp) through 1200cc injectors.

regorih

you want a twin pump kit look to racetronix for a solution, they have one.

Also heads up on getting tuned for e85. Unless you self tune, you'll need to somewhat get retuned each time you fill up. That because of the differences in ethanol content in the fuel.

I'll give you an example since our cars are not flex fuel sensor happy.

You're FI on a straight (non flex fuel) e85 tune.

Lets say you have pump e85 with an ethanol content of 70% and your get tuned for a WOT AFR of 11.5 (using the gas scale) and everything is happy.

Lets say a month later you pump e85 but now has 40% ethanol content. Without making any changes to the tune your WOT AFR will now be richer, lets say something like 11.0 AFR

The third scenario, you pump e85 with 85% ethanol content. Again without making any changes to the original tune your new WOT AFR will be leaner, maybe like 12.0 AFR.

Just something to consider when going e85 in a non flex fuel car. If the car was flex fuel capable it would see the changes in ethanol % and add or subtract fuel amounts to keep the AFR on target

neoVVL

I appreciate the input but that's really not necessary. I've run e85 for years in prior race cars.

In my area we've got a few stations that actually keep e83+ in the pump year round (been verified and frequently tested). Also once you get the sumer blends if you stick to the same fuel company it's fairly consistent. If you were to tune on the absolute edge of safety margin sure, you'd probably need to adjust the tune frequently but e85 is an easy fuel to tune. You generally find the best afr and timing is well before the limits of the set up. You're right, ideally you'd use a flex sensor and never have to worry, or take my aproach and keep the fuel used consistent enough. I'm not blindly filling up with unknown fuel. But it's good info, a lot of people aren't aware how vast the fluctuations can be with "e85".

Also racetronix doesnt have a solution for the early c5 tanks....

Vette97sc

I get 620hp (E85 fuel) with Walbro 450 pump and KB 40A BAP. I also make new wires to pump and use stock harness only to control relay. My brother make that pump to fit in stock bucket. He also make new power connector to tank plate.
I use 3bar base fuel pressure.

HardcoreABN

I am running an in-tank Walbro 450 for normal driving and a boost-activated Magnafuel 4303 external pump....I am shooting for 1,000 - 1,100 whp on e85.

winters97gt

Build your fuel system for 250hp more than you intend to run. My fuel system will support 750-800 on E, but I won't go there. 1000 on pump or race gas won't be a big deal. It's already been there.

BLOWNBLUEZ06@RKT Performance

Have you already been running your system at 3 bar? If so, what are you doing to manage the fuel transfer circuit because I've never seen one work below about 50psi base pressure with out doing some custom work.

Where did your brother get the power connector? Did he make it from scratch? That's pretty cool. I use a custom steel fitting with O-rings and filled with Teflon that houses 4 silver-tinned, Teflon jacketed 10ga wires.

Also, you may have done something about my next comment, but I wanted to comment to the members about using caution when reusing the factory bucket. The stock pump assembly includes a jet pump that bleeds fuel into the bucket to keep the pump submerged in fuel. The other pumps like the 450 don't include that jet pump strategy, so it's important to take measures to make sure the pump gets plenty of fuel.

Vette97sc

Yes i was driving last summer with 3 bar fuel pressure. Fuel regulator is connected to manifold. Fuel lines to engine bay is stock. I didint find pic about engine bay but in this video can see how lines going. I cant connect fuel rails together in behind. AN connector dont fit. I have now banjo and have to try that. Maybe need to cut fuel rail abit and make longer thread.
My brother make that connector himself. He draw that in CAD and he use machines in work to make it. Fuel bucket is working just like stock, in that pic just missing that bucket. Have to take better pics about bucket when take it out.
We measure how pressure effect.
From pump.........4,2bar.....14V.....5,66 l/min......340 l/h
Before fuel rail....4,2bar.....14V......5 l/min.........300 l/h
From pump.........3,7bar.....14V.....6,1 l/min.......367 l/h
Before fuel rail....3,7bar.....14V.....5,4 l/min.......324 l/h

Echo97vette

Which 340lph pump? AEM? What are you using to regulate your pressure with that system?

romandian

so are you saying you get 25 l/h more by decreasing fp by 0.5 bar and that 40 l/h goes to the jet pump?

Vette97sc

Walbro capacity drop alot in high pressure. I think that 40 l/h go to passeger side tank. Line go to other tank before fuel filter.
14V 5bar 280 l/h
With Kenne bell BAP
5bar 380 l/h
4bar 450 l/h

romandian

and thats why you need a bigger pump if you are boost referenced. where are you from?

Vette97sc

I writing from Finland, thats why english is not so good

Kerviper

Sorry wrong thread grabbed for my response!