Rb20Det Fuel Pressure Reg Question

[AverageA31]

Gday all,

pardon me if its a silly question- Ive googled it but cant find an answer.

1. Why is there a fuel pressure damper thing on the back of my rb20det fuel rail?

2. Currently mine has no vaccum line attached to it and it runs anyway, should it be connected and to what?

3. What are the consequences if it is not connected (a recent dyno run showed it was running lean, could this be a possible cause?

4. Also does anyone know how to check if my stock fpr is working good enough or should I upgrade

(currently running gtr injectors an bosch 040 pump?

Thanks for any help

Jes

Edited February 21, 2012 by AverageA31

[rob82]

Gday all,

pardon me if its a silly question- Ive googled it but cant find an answer.

1. Why is there a fuel pressure damper thing on the back of my rb20det fuel rail?

2. Currently mine has no vaccum line attached to it and it runs anyway, should it be connected and to what?

3. What are the consequences if it is not connected (a recent dyno run showed it was running lean, could this be a possible cause?

4. Also does anyone know how to check if my stock fpr is working good enough or should I upgrade

(currently running gtr injectors an bosch 040 pump?

Thanks for any help

Jes

1. To dampen fuel pressure oscillations.

2. The dampeners don't a vacuum feed but the fpr does.

3. If the fpr is not connected your mixtures will be rich on cruise and lean on boost.

4. No problems with STD regs at all.

[HYBR3D]

Great timing for this post! I was just thinking of purchasing one but am a little confused..

Are the RB20det, RB25det and RB26dett Fuel regs the same? Would one of those universal adaptors that fit sr20s and rb26 etc etc also fit?

And what pressure would a standard regulator usually be set around?

Im trying to find a suitable Nismo one to fit in place or even just use a Sard one with the adaptor plate. But nothing states that they will fit a RB20 only a 25. Kind of frustrating

Thanks guys

[JonnoHR31]

just use a standard reg, aslong as its working its the best reg to use. standard base pressure is 43psi

[Fast_32]

Jonnohr31, how much pressure should I run thru my rb20 r32 with a high flow 25 turbo, running around 12psi? Any recommendation?

[JonnoHR31]

Leave it standard. The only reason to ever use an adjustable reg with basic mods is for squeezing a tiny bit more flow out of standard injectors. But even then its not ideal.