Like the question states---i will be running no more then 10lbs on my stock block b16 w/ supertech springs and retainers..revving to about 8500. Should I pick up an FPR as part of my build? Is it necessary? Stregths, weaknesses?

LMK
-E

 

I'm running a stock FPR right now.

 

get it

 

get it as in i should get one?


what are the advantages? does it help with tuning? Will I make power with it? Is it for safety of the motor?

what are good FPRs to get and general prices?

 

7.5lbs @80% duty cycle
dsm 450s

having a fpr will be good becuase it will lower the duty cycle as u rasise pressure

being in CA
i do not want to get a FPR
so im sticking with the stock one and either get 550s or stay at the same boost for a while

 

Ok I am running precision 550s for a light setup---I was assuming my duty wouldnt be as high because of their flow capacity? Am i wrong?

 

just get the injectors you need, check out r.c.eng.com or just google rc injectors.

 

so any suggestions about a particular one?

 

what is your hp goal?

 

Here's the info you want... if you use a Walbro 255lph pump with a stock regulator your fuel pressure will be around 60psi at idle.

It will be "safer" to get a regulator to turn the pressure down to a stock level.

So, it can be done with a stock regulator, and alot of people do it, but you are putting a lot of pressure into the injectors.

Another word of wisdom so you dont waste your time, cheaper FPR's like the B&M cannot turn the fuel pressure down low enough with a Walbro 255 fuel pump. So I would reccomend either an Aeromotive, Paxton, or AEM regulator.

Also 550's will be great for your setup.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dunkd &raquo;</TD></TR><TR><TD CLASS="quote">Here's the info you want... if you use a Walbro 255lph pump with a stock regulator your fuel pressure will be around 60psi at idle.


</TD></TR></TABLE>

That's with both the "High pressure" and "standard" 255 pump? or only the high pressure version?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr.speaker &raquo;</TD></TR><TR><TD CLASS="quote">That's with both the "High pressure" and "standard" 255 pump? or only the high pressure version?</TD></TR></TABLE>

thats my observation with the HP pump. I am pretty sure the standard is the same, no first hand experience though.

 

Thanks for the Info. And you mean "pressure on the injectors" being duty cycle?

My power goal is 240-260whp.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by StreetEG &raquo;</TD></TR><TR><TD CLASS="quote">Thanks for the Info. And you mean "pressure on the injectors" being duty cycle?

My power goal is 240-260whp.</TD></TR></TABLE>

"pressure on the injectors" means just that. there is more pressure being forced through the injectors. It is better to use the closest to stock pressure. However, when you are trying to get peak performance out of your fuel system sometimes you have to raise the fuel pressure.

duty cycle is directly related to horewpower level @ a fixed fuel pressure. For example, 550cc injectors will be at about 80% duty cycle (max recommended) at about 375whp at stock fuel pressure. You can raise the fuel pressure 10psi at the same WHP level and it will make the injector duty cycle drop.