legacycentral bbs

Adam from Z-1 said:
"a rising rate fuel pressure regulator (or RRFPR) is the same thing as
a fuel pressure regulator."

Then:
"If you do get to the point with your car that the stock fuel pressure is
higher at idle than factory specs, only replace it with an adjsutable 1:1
regulator...you do not want a 2;1 or higher like a Vortech, etc for a
factory
turbocharged car"

And i'd like to make a comment to further specify what he's talking about,
because the 1st sentence is very misleading.

There is a difference between a standard Fuel Pressure Regulator, an
Adjustable Fuel Pressure Regulator (AFPR), and a Rising Rate Fuel Pressure
Regulator (RRFPR).

True: you're stock fuel pressure regulator is not adjustable and you WILL
need to beef up your fuel system if you're planning on tapping more power.
It is not made to handle the higher flow rates and demands that the
increased fuel pump will provide, and your upgraded injectors will need.

BUT there is a major difference between any sort of RRFPR and a simple AFPR.
Simply put, a RRFPR is not good for true ultimate performance, and can
become quite sloppy fuel delivery in comparison with an AFPR.

After upgrading your fuel pump, your fuel pressure will increase because the
pump is trying to push more thru your system (simple enough). This kills the
OEM pressure regulator. A high quality fuel pressure regulator (like one of
my favorites from Aeromotive) can be used to turn that back down to stock
levels; or higher or lower depending on your fuel injector needs. Then for
every 1 psi of air, it will give you 1 more psi of fuel - as it should be.
an Adjustable Fuel Pressure Regulator can be used as a tuning component.

A vortech (or weapon*R or likewise RRFPR) will increase your PSI of fuel for
every PSI of air, everyone knows that. But if you are running a 2:1 RRFPR,
after your boost hits ~15 PSI; your fuel PSI will be at 30! You cannot
adjust your base fuel pressure with this method. you're fuel pressure may
become TOO high for your injectors, and then boom, no more injectors. The
cylinder would then dry fire or run super lean or super rich; none of which
are good.

To sum up: if you can, PLEASE avoid a rising rate regulator. They are sloppy
management at best.

-Jason Grahn
(and don't get me started on piggyback engine management. grrrrrrr!)

_________________________________________________________________
zQz:
http://photos.msn.com/support/worldwide.aspx


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Thanks alot for the info You guys teach this kid new things every
day! I have to ask thoe. What is your problem with engine manag.
systems like the TEC II? How else could you get the same affect?

--- In BC-BFLegacyWorks@y..., "jason grahn" <jgrahn555@h...> wrote:
> Adam from Z-1 said:
> "a rising rate fuel pressure regulator (or RRFPR) is the same thing
as
> a fuel pressure regulator."
>
> Then:
> "If you do get to the point with your car that the stock fuel
pressure is
> higher at idle than factory specs, only replace it with an
adjsutable 1:1
> regulator...you do not want a 2;1 or higher like a Vortech, etc for
a
> factory
> turbocharged car"
>
> And i'd like to make a comment to further specify what he's talking
about,
> because the 1st sentence is very misleading.
>
> There is a difference between a standard Fuel Pressure Regulator,
an
> Adjustable Fuel Pressure Regulator (AFPR), and a Rising Rate Fuel
Pressure
> Regulator (RRFPR).
>
> True: you're stock fuel pressure regulator is not adjustable and
you WILL
> need to beef up your fuel system if you're planning on tapping more
power.
> It is not made to handle the higher flow rates and demands that the
> increased fuel pump will provide, and your upgraded injectors will
need.
>
> BUT there is a major difference between any sort of RRFPR and a
simple AFPR.
> Simply put, a RRFPR is not good for true ultimate performance, and
can
> become quite sloppy fuel delivery in comparison with an AFPR.
>
> After upgrading your fuel pump, your fuel pressure will increase
because the
> pump is trying to push more thru your system (simple enough). This
kills the
> OEM pressure regulator. A high quality fuel pressure regulator
(like one of
> my favorites from Aeromotive) can be used to turn that back down to
stock
> levels; or higher or lower depending on your fuel injector needs.
Then for
> every 1 psi of air, it will give you 1 more psi of fuel - as it
should be.
> an Adjustable Fuel Pressure Regulator can be used as a tuning
component.
>
> A vortech (or weapon*R or likewise RRFPR) will increase your PSI of
fuel for
> every PSI of air, everyone knows that. But if you are running a 2:1
RRFPR,
> after your boost hits ~15 PSI; your fuel PSI will be at 30! You
cannot
> adjust your base fuel pressure with this method. you're fuel
pressure may
> become TOO high for your injectors, and then boom, no more
injectors. The
> cylinder would then dry fire or run super lean or super rich; none
of which
> are good.
>
> To sum up: if you can, PLEASE avoid a rising rate regulator. They
are sloppy
> management at best.
>
> -Jason Grahn
> (and don't get me started on piggyback engine management. grrrrrrr!)
>
> _________________________________________________________________
> zQz:
> http://photos.msn.com/support/worldwide.aspx


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Jason - thamks for filling in my blanks.

It shouldbe noted though, that the best AFPR's out there, like the Aeromotive that we also use almost exclusively here, do require that you convert to AN fittings, but it does allow you to adjsut base pressure back dow to stock levels, whihc is exactly what you want!

Adam
Z-1 Performance
www.z1auto.com
(631)254-8277
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zZz <http://docs.yahoo.com/info/terms/> .

A a tec2 is not piggyback, it is eitehr parralel or standalone, depending how you hook it up...however, it is used such that there is no involvement any more with the stock in terms of fuel delivery or ignition timing..the stock ecu would only handle those values at cold start (if done in parallel), or these would be left solely up to the programming of the TECII (if done as a stanalone).

What he doesn't like are things like a SAFC, SAFR, VPC, etc. While I agree they are less than ideal, like even the most expensive engine management, it all comes down to who is programming it....if you are not familar with these pieces, they can quickly degrade performance or even kill a a motor....if you know what you are doing and moniter changes carefully as you make them, they are invaluable IMHO

Adam
Z-1 Performance
www.z1auto.com
(631)254-8277
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zZz <http://docs.yahoo.com/info/terms/> .