Adjustable FPR (never used)

Phinx · Post by **Phinx** » Sun Feb 11, 2007 11:16 pm

Good Evening...

I'm selling my adjustable FPR its never been used has attached fuel pressure gauge , Rezone for sale i have found a new unit.

I have attached a Pick .

ChemCool · Post by **ChemCool** » Mon Feb 12, 2007 8:29 am

Price and what type it is?
Is it a rising type or a static? I am interested to buy

Phinx · Post by **Phinx** » Mon Feb 12, 2007 10:00 am

its a Rising rate 1:1 ratio.
Not sure of the make

I bought the unit from Rezlo...

Link : http://shop.rezlo.com/SA/index.php?act= ... ductId=118

R 400

ChemCool · Post by **ChemCool** » Mon Feb 12, 2007 10:22 am

Ok. Give me another moment or two. I have to clear up the rsing type against static issue. We had this as discussion on the forum, but with lots of confusion. May be I give rezlo a tinkle to try and find out. You see some sx ownrs tell you rising type and others tell you to use static. So what now. Price is ok. Will be back to you soon. Moment plse.

ChemCool · Post by **ChemCool** » Mon Feb 12, 2007 10:28 am

Phinx, I have made up my mind and wont take it. This is my reason and seems no body to proof it wrong until. Thanks again for the opportunity:

In answer to your questions, no, the stock FPR isn't a rising rate, and you don't want a rising rate. They use rising rate FPR's on NA cars that have been converted to forced induction (turbo/supercharger). Since our ECU already has all of the info it needs to add the correct amount of fuel based on the input it's receiving from it's various sensors, all you need to do is give the fuel injectors 36psi static pressure and everything should be OK. If you use a rising rate FPR, your AFR's will get horribly rich as boost pressure increases. As for the 90° hardline, yea, you can remove it.

Static fuel pressure is the fuel pressure that is in the rail relative to the vac/pressure in the manifold. The purpose of a fuel pressure regulator is to give the injectors a relatively constant amount of fuel pressure so that the ECU is easier to program. Here is what I mean; under vacuum, with out a fuel pressure regulator, MORE fuel would be injected than normal since the manifold is "sucking" the fuel into the rail. To compensate for this, the FPR drops the pressure in the rail so that not as much fuel is available to be injectors. The opposite happens under boost. The pressure in the manifold pushes back on the fuel trying to come out of the injectors. With out a fuel pressure regulator, you would have to keep the injectors open longer, or use bigger injectors, which can make having a smooth idle difficult. With the FPR installed, when the boost pressure in the manifold increases the regulator increases the pressure in the fuel rail in a linear proportion so that the same relative amount of fuel is injected. AKA, with vac fuel pressure goes down, with boost, fuel pressure goes up.

Phinx · Post by **Phinx** » Mon Feb 12, 2007 10:50 am

Correct thats why it wasn't used

....

Plus I wanted to keep the fuel curve

Gary57 · Post by **Gary57** » Mon Feb 12, 2007 10:57 am

the stock FPR isn't a rising rate

Put a fuel pressure gauge on and go for a drive. The pressure is about 1.8Bar at idle and about 3.8Bar at full throttle and full boost.

veecee · Post by **veecee** » Mon Feb 12, 2007 11:20 am

Gary57 wrote:
the stock FPR isn't a rising rate
Put a fuel pressure gauge on and go for a drive. The pressure is about 1.8Bar at idle and about 3.8Bar at full throttle and full boost.

i agree - and read the manual. there is something in there about fuel pressure changing depending on the level of boost/vacuum in the manifolds!

if the stock fuel pressure regulator is a static one, why is it connected to a boost/vaccum hose and a control solenoid. have a look on the left suspension tower, just below the amplifier unit thingimajicggy, you will find that solenoid!

the level of boost/vacuum in the manifold will affect the level of fuel pressure in the fuel rail!!!

Phinx · Post by **Phinx** » Mon Feb 12, 2007 11:26 am

True that.

Well i'm not sure anymore. All i know is this Adjustable FPR is for sale

ChemCool · Post by **ChemCool** » Mon Feb 12, 2007 11:46 am

There we have it again. No clarification. On the one hand we have this and on the other hand we have that. It sounds like we are economists here.
It let me think of this Head economist of a company asking his recruitement officer to recruite a new economist for the Company. But he asked the recruitement officer to get a person with only one hand. So the recruitement officer ask why? And the Head said to him"Because I am sick and tired of economists saying on the one hand we have this about the economy and on the other hand we have that".

Hennie Marais · Post by **Hennie Marais** » Mon Feb 12, 2007 2:41 pm

most regulators with vacuum/boost reference will be a 1.1 ratio. Stock SX regulator I've tested is a 1:1 ratio with boost reference. Some of the "Smart racing" (Hannes Minnar) regulators had a rising rate ratio of 1.7:1.

debz · Post by **debz** » Mon Apr 23, 2007 9:47 am

is it still for sale

ChemCool · Post by **ChemCool** » Mon Apr 23, 2007 2:43 pm

is it still for sale

Sorry, no it is not any more.

veecee · Post by **veecee** » Mon Apr 23, 2007 3:00 pm

but i have one lying around if you want!!!

debz · Post by **debz** » Mon Apr 23, 2007 3:14 pm

with guage