OEM
Fuel Pump Limits
by:Titan
Every vehicle needs fuel to run and increasing the horsepower of
your car requires more fuel. The saying, "more fuel equals
more power" defiantly holds true especially in turbo applications.
So, how much fuel can the stock pump provide? The answer to this
question is vital to producing a reliable turboed Saturn car. Turbo
cars need a larger amount of fuel than a naturally aspirated car
because the additional fuel provides both more horsepower and a
cooling effect which helps reduce detonation when under boost. Bosh
makes the factory fuel pumps installed in all Saturn cars and information
is presented below.
|
Pump #
|
Type
|
G.P.H.*
|
P.S.I.*
|
Year
|
Volts
|
|
E3951M
|
Turbine
|
35-45
|
70-90
|
98-99
|
12
|
|
E3944M
|
Turbine
|
30-40
|
70-85
|
97
|
12
|
|
E3909M E3910
|
Gerotor
|
30-45
|
65-75
|
91-96
|
12
|
*maximum
Some interesting observations come to mind while looking at this
data. The first is that many people tend to use raising rate fuel
pressure regulators (RRFPR) which is a perfectly acceptable means
of increasing fuel delivery. If you are going to turbo a Saturn
car built between 1991-1996 you must be careful when utilizing a
RRFPR. Here is an example that would be less than ideal.
The stock fuel pressure is 43.5 PSI. Adding 5psi of boost with
a 6:1 RRFPR would net you an increase of 30 additional PSI of fuel
pressure. This added to the stock 43.5PSI gives you 73.5PSI total
fuel pressure under full boost. The maximum fuel pressure for the
91-96 cars is between 65-75PSI putting a big strain on the pump
creating an unreliable fuel system.
Here are some tips that will help provide you with a more reliable
fuel system.
Never go above 60PSI on your stock fuel pump
Remember that when you increase pressure you decrease volume
An aftermarket fuel filter, although pricey, offers less resistance
and more flow through the system
Be sure that you know your cars needs and allow for a margin of
error that will increase the reliability of your car.
|
The turbosaturns.net
forum has become one of the best resources for Saturn performance
on the net. Our members are constantly pushing their cars to new
performance levels. So, log in, share your ideas, and help push
your car’s performance to the next level.
Archived Articles
August 2005 TSN will be holding its first ever meet
in Chardon, Ohio. Some of the fastest Saturns in the country will
be attending. Activities will include drag racing, dyno, tech session,
and BBQ. Look for the latest information in the forums.
Different
Racing
Jeff and his team Different Racing have big plans
on breaking into some really low quarter mile times this year. Last
year he posted a 12.40 on a pretty healthy nitrous shot. This year
he has a new turbo setup and some serious determination. Visit his
website for the latest news and information. I expect we'll be seeing
some low 12's from him by the end of the year.
|
