MrCain

Have enough voltage on the coils?

Correct => you can use copper parts in youre engine with no problems! EGT stays pretty low! Even with higher AFR. But MAF sensor is a bit out of range full trottle STFT at 40%....no check engine on the dash? Still very curious at the results with the twin pump setup!

Wise decision to keep the line between FPR and rail as short as possible. Weldings are better then mine! Aluminium is pretty f#$"up to weld.... Think that ,with this setup, fuelpressure problems will not be an issue. Hope that the DW300 has enough capacity to feed youre surge tank. Even the engine bay is pretty stuffed now maybe need for a bigger car Keep up the good work and posting youre drawings!

Bigger (or double) lines from surge tank/pumps will make a big difference i think . This is not really simple with AWD i guess....there is not that much space, when i see you’re pictures of the situation under you’re car.... Also bigger regulator is also recommended: good choice! Now its imported to eliminate every restriction in you´re fuel system so you will have full cappacity of you´re new fuel settup! but i think you already know that! BTW: really like you´re avantar!!

Fuelpressure stays more stable now! Only fitted a (bigger?) other fitting on the rail? Good work man!!

Now you're telling it to youre self, but when you standing at the line.....

Now i'm getting it! (finally….) Hmm…..i’m still hanging in the M4.3 trip… Reason why I’m thinking in 2 fuel lines is that then you are sure you get the max out of both pumps. Didn’t know that M4.4 has a separate FPR. Learned something today! You making a good point why you’re using a single line, its keeping it simple and easier to work on. And 10mm ID will be more than enough for a good fuel consumption! I’m curious at your mileage BTW: already dicided where to place this all? In car is maybe the only/easiest option but not the safest solution... AWD has not really much space under the car. Dont know how big the surge tank with pumps is.

.........Seen the photo's when i was home: photo's are blocked on my PC at work..... Iam start to get it now! Surge tank gets the feed of the tank pump? Im not really get the picture at this moment. 10mm ID should be enough I think! Pressure drop when youre (serious big) injectors opens and close should be minimal. Why not both lines directly on youre rail?

If you cant get further then 6", then 6" it is. Pumps are placed inside the fuel tank, no? And there is no posebility to exit the tank with 2 lines.... Never place youre y pice directly after the pumps. And 6" isnt directly after the pumps in my opinion Dont know what the precice length must be....there is no rule for that witch i know, only that the lines must be equal of lenght....Think it would be a trial and error...Therefore i said ; keep youre y pice so far as possible from youre pumps. Edit: most ideal is to mount both lines on youre rail => almost no pressure drop over the (single) line so you have max pressure/capacity of both pumps. Youre rail is big enough to be a sort of buffer and pressure drop cant be a issue then.

I´m sure you will fix it! No doubt about that!! Never seen someone with this perseverance like you!!! Seen a couple 500 pk projects and they all broke down on engine faulure...I dont want to scare you, that is really not my intension, please dont get me wrong. Think that youre have some bold plans and you will get the 500AWHP on some point, there is no doubt about that! I have confidence in youre plans. Please keep up the good work and dont let you down, not even from a crazy negetive dutch man You know me: im always see some problems and always want to understand whats happening. And yes: i have read the thread a few times already.... BTW: keep youre y pice so fare as possible from youre pumps => pressure pulse wont be a problem then, pumps will like that better.

You really want go for 500WHP?? Damn dude…. That’s a ambitious plan you got there! Prepare yourself for a bumpy, hard and uphill journey Hope you manage it and keep it running => Think you already have a good base for this project! I’m very curious to this project and will follow this journey I understand now the choice for the parallel twin pump plan, think you will solve some pressure drop issues when fitting larger fuel lines. Pressure regulator can handle the demand?

When you’re sure that both pumps are running within there curves, its not a problem. But if the pumps are running out of the curves there is still a change of cavitation…even when submerge.. We encounter this problem with some parallel submersible cooling pumps here on site. Just make sure that you’re pumps are running within their curves, and then it will be no problem. I’m trying to say that even submerge pumps can cavitate in some conditions and it will occur sooner with parallel pumps. Single pump did not have the capacity for your fuel demand? Not even with larger fuel lines?

2 pumps parallel can also couse some cavitation...Pumps parallel is not the best way. Is there not a single pump with some high capacity in the retal?