Sounds like the injectors are basically wide open and flowing all the fuel the pump can get to them. Last injector inline isn't getting the same as the first No overhead.

 

the way mrfred explained it is as follows:

if the fuel pump is not strong enough to flow enough fuel to the rail, and you start to go lean, it is because all 4 injectors are not seeing enough pressure to spray as they should be. they all spray the same amount, but if you're running out of fuel pressure to the rail, the injectors will just see much less pressure, which in turn will effect how they work and the safety of the fuel system is then compromised.

so in short, make sure the injectors are always seeing around 40psi of pressure at all times if you want a healthy operating fuel system.

i imagine if you get below a certain threshold, you can start effecting how each injector sprays vs another, which is really bad.

 

Tom is about to post the final e85 results after the double Pumper install now.

 

Lukes car was definitely dying for more fuel! after the buschur double pumper install, i had to rescale the rom much leaner (normal), and then richen the map values back to normal, and lean the top end out since the fuel map values were super rich to combat the lean dip on the single walbro.

final e85 results on lukes car (only took 3 pulls):



And here is before & after with the br double pumper install: look how rich it went! lol (AEM cant read richer then 10 AFR - so i suspect in the mid/low 9's based on power droppage)



gotta love the buschur double pumper!

 

That looks much better!

 

ya it actually looks normal now.

 

awesome! tom you will be hearing from me in about a month or so after i get back, pretty stoked! great results as always

 

2nd pump full time or on a hobbs switch?

zenoise now you have to get that car out to one of our Chicago area track days and see how she'll run.

 

Hobbs switch.

I'd love to. Lmk the dates.

 

you have pm

 

5 months + later and car still making over 500whp~ and still as healthy as it was before with tons of abuse.

 

Just ordered my remote tune on Friday from you guys, just waiting to hear back but im so stoked, cant wait, you guys definitely do awesome work !

 

Always love getting updates in this thread I have very similar mods and much lower numbers haha so this thread is always inspiring LOL