tech@WS6store

iTrader: (2)

No. That is a bad idea. Depends on the boost you are looking at running. If you need a separate fuel pressure regulator then you would get an external adjustable one or use our c5 regulator kit. The stock regualtor has been pushed to quite a bit of power, but you can run into quite a few issues with it not being able to keep up or the plastic housing leaking aa well.

01ssreda4

iTrader: (96)

Going boosted most mount aftermarket regulators under the hood, ditch the stocker, and run the reference line to it.

Familyguy9877

Okay. I'm new to the boost scene. Looking at an on3 single front mount kit.

Crf450r420

iTrader: (1)

If fuel pressure doesn't drop with the vacuum in the intake it's like the injectors get bigger. Only an issue when you make bigger power and you can't open the injector a short enough time to reach your required fueling at idle. If you don't raise your pressure with boost in the intake then it's like your injectors are getting smaller. This would require larger injectors and put you closer to having to much fuel for idle. Vacuum reference regulator is the way to go.

joecar

With boost, tuning will be easier if you install a MAP-referenced FPR because the IFR in the tune only handles vacuum, not boost (it's axis does not extend into boost).

gametech

iTrader: (1)

That is irrelevant. A manifold referenced (for boost/vacuum) FPR will allow that table to be populated with the same number. Ideally this number will be the actual flow rate of your injectors. With the change in fuel pressure equaling the change in manifold pressure, it makes the IFR effectively static.

tech@WS6store

iTrader: (2)

With the 99-02 trucks with the manifold referenced fpr youll see that. Static ifr. The 03 and up with returnless rail are scaled.

joecar

Both your/my point being that a non-static (sloped) IFR table pegs at the zero VAC value during boost.

joecar

And Y-car and F-car are returnless/sloped/scaled also.

tech@WS6store

iTrader: (2)

The 97 vette was return style. Also vacuum referenced.

joecar

Yes, it does have return style, but the FPR is vented to atmosphere (take a closer look at the hose, it goes nowhere) making it un-referenced... and the IFR table is sloped (which can only work if the FPR is un-referenced).

tech@WS6store

iTrader: (2)

The hose goes to the side of the stock air tubing right before the tb so it would be considered ported vacuum at that point.
I did not say it wasnt scaled, i was pointing out the way the ifr table is used and those are the 2 easiest comaprisons then you added in the f and y body, but most forget the 97 was such an awkward step child that it had return and a gameboy for an ecm.

gametech

iTrader: (1)

I was under the impression that once the discussion turned to referenced FPRs that returnless setups were off the table.

tech@WS6store

iTrader: (2)

What i said just shows the difference in stock form and viewable stock programming the difference between the two and why on nearly the same platform.
For quite a few boost setups you dont have to use a referenced fpr and even in those situations that you do most dont use them properly anyway and put a waterhose injector on a 5.3l for example.