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03-16-2014
This cars fuel rail. The engine came out of a 2004 Chevy Impala SS Indy 500 Edition. My 1999 GTP engines fuel rail doesn't have that little circle thing left of the Boost Bypass Actuator. What is that and what does it do?
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03-16-2014
Just a little fuel reserve thing. Won't make any difference.
03-16-2014
Alright thanks! I was just curious if it would affect the tuning or anything. But if it doesn't change anything, then I am content with that
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03-17-2014
its a pulsation damper and yes it affects tuning since it reduces the fuel pressure pulsationOriginally Posted by tomtom123
GM saw fit to increase the surface area of the dampeners greatly from that design to the L32/26 design but that's due to the worsening of the pulsation effect with the fpr in the tank on a deadhead/returnless system.
the bigger you injectors the more your fp fluctuates as the pop open and closed.
you can see the effects first hand with a mech fp gauge on your damperless rails youll see the needle bounce at idle, its travel will be roughly halved when you do the same test with the dampened rails
consistent fuel pressure means consistent fueling
03-17-2014
Since my car was a 99 and didn't have that, would it be best to swap my fuel rail onto this engine?
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03-17-2014
I would bend over backwards to keep the damper.... get rid of your old rails
03-17-2014
I guess I just don't understand then. It helps with fuel pressure consistency? That's good, right? But the 1999 GTP had 36# injectors and the 04+ had 33# injectors, iirc. So should I keep these fuel rails and put the 36# injectors in these rails? And I'll have to tune my car to this new damper, right?
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03-17-2014
no you will not need to tune specifically for it but the damper will keep fuel pressure fluctuations from affecting fueling which is good
the effect is amplified the bigger the injectors so for big builds dampers can be a great addition
use your injectors with those rails with the damper and you're set
03-17-2014
and that is technically a series 3 l67 only the Grand Prix got the L 32 that had the stainless fuel logs with the largest fuel rail pulsation dampers and gen5
03-17-2014
I get the dampening. But non of us who have purchase modified fuel rail or even billet fuel rails have this. So it's good to have but I've never heard of a push to add this before. Am I missing something.
03-17-2014
these are the pulsation dampers inside the l32 rails. you grind off the weld opposite the brazed end and knock out the plug that remains... they are sized for dash 6 rails id...but I install them in dash 8 dash 10 Fatman rails by modifying them.
03-17-2014
I haven't tried it yet but I'd like to see if you can shove them inside Aeromotive rails
03-17-2014
So the engine I picked up was a L67 with the Series 3 3800 that just has a Gen 3? Which in Grand Prixs is actually the Series 3 3800 with a Gen 5?
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03-17-2014
04+
Originally Posted by Sven The Sexman
03-17-2014
Right. I know what year they switched for Grand Prix's. Just didn't know about the other GM cars, such as the 2004 Impala
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03-17-2014
Engine is 2004 Gen 3 supercharger with return style fuel rails.
GP's only had gen 5. 2004 thru 2007
03-17-2014
Yeah. Too bad this engine didn't come with a Gen V. Hah
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