1936 LS1

iTrader: (10)

The more I read, the more confused I got, LOL.
This is in a '77 Crew Cab Dually with a 4L80e and about a 2400 stall converter from Hughes. Clearly not built for all out speed! Just a fun tow pig!

LQ4, with a BW S366. 80# Deka injectors. Walbro 450 pump. 2 Bar MAP.
Goals are around 600HP .


Plan was to run the stock truck FPR after reading success stories of guys doing that. Tuner, however, suggested a boost referenced FPR.
I know myself well enough to know that one day I'll want to turn up the boost and/or go to a bigger turbo. No reason to cut corners now that will impede that later but I don't want to waste $$ or needlessly complicate the fuel system either.

Your suggestions, please.

Thank you.

LLLosingit

iTrader: (4)

If you understand what a boost referenced regulator does and why then you'll be able to answer it yourself.
What is does, As boost rises it raises fuel pressure on a 1:1 ratio. 1lb of boost raises the fuel pressure 1lb and 2lbs of boost pressure raises the fuel pressure 2lbs and so on.
Why it's needed, As boost increases the injector has to overcome the increased manifold pressure to keep the amount of fuel delivered the same. In simple words, Your injector is rated to deliver a set amount of fuel at a specific fuel pressure and the ECU uses that information to calculate the fuel needed. This is where boost throws a wrench in that calculation, For example if you're running 50psi of fuel pressure and the injector is trying to inject into a manifold that is already pressurized to 10psi then the amount of fuel pressure the needed to inject the same amount of fuel now needs to be increased to 60psi to compensate.
Tuners can sometimes compensate to make up some of the difference but I prefer to use a good regulator.

LLLosingit

iTrader: (4)

I will also add this, As boost increases the need to have your fueling accurate becomes even more critical. A little lean on a naturally aspirated engine may cause poor performance/ Lean pop and so on but on 10-20 pounds of boost it could cost you an engine.

yenkomike

iTrader: (2)

the stock truck fpr is boost referenced. they might not be 1 to 1 but they work just fine. they are also adjustable I run mine at 55 psi static.

01ssreda4

iTrader: (96)

Yes, your 450 will likely overpower the stocker anyway.

1936 LS1

iTrader: (10)

What fuel pump and what boost levels are you running?

yenkomike

iTrader: (2)

I run the single stocker with a single aem 380 with good results. on e85 and 13 -14 lbs boost it runs 10. 00s . at that point I was out of fuel pump. so I added a second pump and a second left side fuel rail with a second stock regulater. I have a check valve on one pump for street driving and I turn on the second pump at the track. that has worked great to 20 lbs boost and the car runs 9.40s @3510 lbs so I run two 3/8 feed lines and two 5/16 returns and it works like a charm.

yenkomike

iTrader: (2)

if you look close you can see the fuel lines on both rails. I can add fuel to the table and flood it until it pegs the afr guage rich with deka 80s

406chvycamaro

iTrader: (7)

Any recommendations on a good aftermarket regulator?

3 window

iTrader: (1)

Game ova

Aeromotive here, been on the car for years now.

BCNUL8R

iTrader: (2)

I really like Magnafuel stuff and use their MP-9950-B regulator.

JoeNova

Stock truck regulator here boost referenced on a pair of AEM 380s with E85. Zero issues.
Pumps have to be staggered though, kicking the second one on at 8 PSI, otherwise fuel pressure is too high when running them both.