onfire

iTrader: (17)

Very nice system....well thought out.


I'd have your engineers spec a max pressure for 1000rwhp. If someone tries to boost reference Mototron 60's with a base pressure of say 70psi and push 20psi of boost....the 342's will drop off bigtime in flow at 90psi.....actually they drop pretty hard starting around 70psi.....don't ask me how I know

peter@aps

iTrader: (2)

Thanks for those kind words and the extreme fuel system runs at 58 PSI plus boost pressure and our engineers have specified this entire fuel system to support a 1000 rwhp on a twin turbo engine, right down to the size of the fuel rails and twin teflon lined braided stainless steel fuel hose assemblies.

Peter

onfire

iTrader: (17)

Typical 342 on a bench:

50psi 390lb/hr 8.5amps

70psi 335lb/hr 10.9amps

100psi 200lb/hr 15.4amps

peter@aps

iTrader: (2)

Onfire, I will get the Walbro 342 fuel pump test data and post it up for your early next week.

Thanks,

Peter

99Fbody99

The fact that EVERY OEM vehicle manufacturers their fuel system to contain a fuel filter between the pump exit and injector. PERIOD!
This includes the C6 and late C5 FSS fuel systems, you just didn't figure out what it was when you took it apart.

Second, show us some concrete test results, preferably independent for a change and not marketing hype. If you search within this forum you will find a number of people unable to make 1000rwhp with various twin 255s. And the rare few that actually have made it have issues with system degradation with heat. The couple that I know of run a healthy dose of meth to reduce the fuel system burden.

Dave

peter@aps

iTrader: (2)

Dave, I just had a close look at the C6 fuel unit and there is indeed a small filter (non serviable type imo) in the stock C6 fuel sender assembly. I had a good talk to our fuel system engineer and he has no problem with removing that non servicable fillter (as in his opinion, it's highly unlikely that anyone is ever going to remove the fuel tank to replace that filter) as we have twin filters on the walbro 342 fuel pumps.That said, it would be a relatively simple procedure to install a large after market type fuel filter/filters to the fuel C5/C6 system.

Dave, A single 342 Walbro fuel pump will support 500 rwhp, I have run many of these 342 Walbro fuel pumps at that power so it make logical sense that 2 of the exact fuel pumps (each with their own fuel line and fuel reg) will support around 1000 rwhp imho on a twin turbo LSX engine. If you don't agree with that then that's cool, we are all entitled to our own opinion.

Peter

onfire

iTrader: (17)

An independant dual fuel line and FPR per pump will step up the efficiency. I'm using twin Bosch 044 pumps but they feed into a Magnafuel y merge....I've never measured it but I would guess the merge drops the second pump down 20-30 %.

rjw

iTrader: (3)

Peter

You still haven't answered the question as to why no fuel filters with your system. Socks before the pumps are BS ..are we all supposed to hope that we don't clog an injector and lose an engine?

You haven't responded to this over at the other forum either.

peter@aps

iTrader: (2)

Dave, I just had a close look at the C6 fuel unit and there is indeed a small filter (non serviable type imo) in the stock C6 fuel sender assembly. I had a good talk to our fuel system engineer and he has no problem with removing that non servicable fillter (as in his opinion, it's highly unlikely that anyone is ever going to remove the fuel tank to replace that filter) as we have twin filters on the walbro 342 fuel pumps.That said, it would be a relatively simple procedure to install a large after market type fuel filter/filters to the fuel C5/C6 system.

Why? Are you saying that the filters before the pump are unnecessary?

I've never seen a clogged injector due to foreign material coming through the fuel system (EVER and we service plenty of fuel injectors), though if guys are concerned about this issue they can easily fit high quality in line fuel filters at any time.

Peter

black98ws6ta

iTrader: (77)

My car made 920 rwhp on a mustang dyno with twin 225's high pressure with a 42 base pressure, boost referenced. I have noticed that with a base of 60 that they fall off hard and even start bypassing in the tank when boost referenced.

peter@aps

iTrader: (2)

I'd guess that would be around 1000 rwhp on a dyno jet...........what was your fuel pressure at that power level? What model fuel pump and fuel supply line size were you using

Peter

EPP

iTrader: (22)

Anthony, the rubber stuck on our ceiling above the dyno from your slicks is finally coming down... lol Bob

onfire

iTrader: (17)

Anthony can post up the actual test psi, but looking at the pump flow I posted above, I'd guess his max pump pressure boost referenced was 65psi or less.

peter@aps

iTrader: (2)

Here's the Walbro 342 fuel pump performance data prepared by engineering department. As you can clearly see, the 342 fuel pump has sufficient fuel flow for around 600 Hp Flywheel at 11.1 air fuel ratio.

Twin 342 Walbro fuel pumps have sufficient fuel flow for around 1200 HP at 11.1 air fuel ratio as long as the fuel supply line/lines are large enough, APS utilizes twin - 6 teflon lined braided stainless steel fuel lines in our extreme fuel systems.

I estimate the 1200 HP flywheel would be around 1000 rwhp.

Peter

rjw

iTrader: (3)

Ok, I get the picture...1000 hp fuel system and NO filter, even though the factory was wise enough to put one there. But we have the option to put one in on our own?

Got it...

Did that one go over big on the vette forum?

black98ws6ta

iTrader: (77)

The current one I tested has (2) walbro 342's with #6 braided lines in the tank to a y block(block is (2)#6's to (1) #8, then to a #8 single feed. It splits back into 2 near the rails and uses the regulator at the front of the rails. At 67 or so psi at the rails the fuel pumps were opening up there integrated " pop-off " or "pressure relief". I tested this with the pumps sitting in one gallon of fuel and the rest of the fuel system beside me. There arent any huge restrictions or anything in the system eventhough I'm sure the pressure at the pumps is higher then at the rails.


My personal goal was to build a fuel system for a street car that makes right at 1000rwhp. I wanted to see if THAT fuel system was up to task with a base of 58 and rising 1:1 to about 78 psi total. I wanted to run a smaller injector 60/75's as long as I could but it would take a really high pressure pump and big lines and rails to make it work. The conclusions from my redneck test is that the pumps are STRUGGLING AND BYPASSING FUEL at that pressure at the rails. So I will be running 96 lbers with a 42 base and rising 1:1 to keep the flow up with THIS system.

P.S. there was nothing scientific about the above

I am talking about two different fuel systems in my first post. The car that made 920 rwhp had #10 feed and return lines, huge rails, huge regulator. It had a base of 42 psi and a final pressure of 66 max. The fuel system in the info above is for a new car and explains itself.

If you tune the next 1000hp model for free I'll clean the rubber all the way off.

onfire

iTrader: (17)

Peter, If you compare your graph to my chart they are almost identical. Mine was based on 13.2 V at the pump (which is something that needs to be verified for the serious user) and a 0.72 Fluid SpGr...or 6lbs per gallon.

At 50 psi I show 390lb/hr you show 384lb/hr

At 70psi I show 335lb/hr you show 330lb/hr

At 100psi I show 200lb/hr you show 210lb/hr

Looks like you've built a nice system.

peter@aps

iTrader: (2)

Thanks.............we do have many years on fuel system design under our belts (and have one engineer dedicated to that fuel system design role) and I'm sure that the extreme fuel system will meet the need and power goals of the vasy majority of GM performance users, all good.

Peter

2MuchRiceMakesMeSick

Was any pricing ever set on this kit?