Kirban AFR.....just checking if I got it right.

drakesdad · Feb 21, 2006

Got home and opened the box. Read the somewhat elusive directions....they say it will take an hour to install......whatever

Let me know if I am not getting this...
Stock one is on fuel rail now......intake is off so it will be easy to switch. All I took off is the hose to the intake..
Switch the two out.....
Make sure it seats good.
put a pressure guage on.......
turn the key on and off a few times
use a allen wrench to tighten clockwise until desired psi, I've been told around 38/39 is good for my set up.....
Once desired psi is reached......tighten the bolt that is over the allen screw and attach the vacuum hose back to the rear of the intake....
Did I miss anything..?

BlackVert · Feb 21, 2006

sounds good to me. 2 notes:

- have a rag ready because there may still be pressure in the fuel lines when you disconnect it.

- i have the car idling when i adjust mine, to make sure the pump is not losing pressure. if nothing else, leave the key in the on position.

Black95GTS · Feb 22, 2006

You want it at least at 39 PSI. There is some debate on the usefulness of AFPRs due to the stock PCM's propensity to regulate fuel pressure back to 39 PSI after it adapts.

A lot of people see increased horse around 42-3 PSI, only to have that slowly go away as the computer will only use 39 after a while.

Then again some people swear by AFPRs... I just don't get it. I resolved a long time ago to tune at 39 PSI and avoid any debate.

Once again, I would make sure you are using at least 39 PSI.

Adam

BlackVert · Feb 22, 2006

Black95GTS said:
You want it at least at 39 PSI. There is some debate on the usefulness of AFPRs due to the stock PCM's propensity to regulate fuel pressure back to 39 PSI after it adapts.

A lot of people see increased horse around 42-3 PSI, only to have that slowly go away as the computer will only use 39 after a while.

Then again some people swear by AFPRs... I just don't get it. I resolved a long time ago to tune at 39 PSI and avoid any debate.

Once again, I would make sure you are using at least 39 PSI.

Adam

just to clarify things a little ...

the computer doesn't really "use" 39 psi, it doesn't change what the pressure is set to, and it doesn't know what the pressure is set to. its purpose is to target specific a/f ratios under the conditions (loads) it has been programmed to expect. to that end, it will adjust the pulsewidths of the injectors based on feedback from the o2 sensors to bring the a/f ratio (under normal operating conditions) to what the pcm has been programmed to target.

it was programmed with the assumption that the fpr kept the psi at 39, and it uses that info to make its guess at how long to open the injectors to get the desired fuel into the cylinders.

increased pressure would richen the a/f ratio, but that would cause the o2 sensors to tell the pcm that the mixture is too rich, which in turn would cause the pcm to shorten the injector pulsewidths to bring the a/f ratio down to what it was programmed for.

so i agree with Black95GTS, the computer will adjust for increased pressure and you will be foiled if you try to use it to richen the a/f ratio.

drakesdad · Feb 22, 2006

So I am safe to set it at 39 psi right off the bat......and the guage can be placed at the shrader valve on the fuel rail correct? for some reason the guy at Summit told me the mechanical guage will connect to the AFR but there is only a vacuum line and a adjuster screw on top....I don't see any mechanism to remove to put the guage into........any comments?

HISSIN50 · Feb 22, 2006

39 PSI (Simulated WOT, which is the pressure reading with the vac line to the regulator removed) is stock. So that is always the recommended place to start. You might find that you end up bumping it up a few PSI, but 39 is where I would start.

My take on the rail mounted gauge: it can be stressful on the gauge as well as the rail. A remotely located gauge would have its own support bracket and there would not be the weight of the gauge on that Schraeder fitting. But plenty of guys do it that way.

If on the cheap, a local high pressure/hydraulic hose warehouse should be able to rig up a high pressure black hose for pretty cheap (braided is too $$ for me personally).

I dont know about the gauge port on the FPR - I thought some of them have that too. But the Kirby should work well - they have an extra O-ring to prevent leaks.

Good luck and bump.

drakesdad · Feb 22, 2006

To be honest....I just want to use the mechanical guage to set it for now. I talked to Joe and will get a electrical one, he states they are a little higher but worth it....I just want to get the intake put back on and see if the 24 injectors, maf and TB are going to work......I can always put another guage in.............You don't have to have it on all the time do you, or is it recommended? I can't find a electical one on Summit.....anyone know where to get one?

BlackVert · Feb 22, 2006

fwiw, i have never seen a gauge mounting point on a fpr. the summit guy probably meant the fuel rail, not the fpr.

if it is just to set the pressure, then definately a rail mounted gauge is fine. i think hissin's comments were for if you are planning have the gauge connected permanently

guys running boost seem to like to set up a fuel pressure gauge permanently, n/a guys typicaly don't see a need for one.

drakesdad · Feb 22, 2006

That's my take, I won't go boost, I just want to set it and finish the supporting mods......If ever one was installed perm. I would go the inside route on a pod....but if it's not needed....

SeventyMach1 · Nov 25, 2006

Back from the dead!

Will, you said you got a Kirban @ Summit. Did they stop selling them or something? (looked & seen nothing but Aeromotive, BBK, & Accel)

HISSIN50 · Nov 25, 2006

Justin, if you want, get with Dave at JD's. He's done very-right by me and had very reasonable shipping. I think his Kirbans are 85 bucks or so if that sounds decent.................

tjh566 · Nov 25, 2006

BlackVert said:
fwiw, i have never seen a gauge mounting point on a fpr. the summit guy probably meant the fuel rail, not the fpr.

if it is just to set the pressure, then definately a rail mounted gauge is fine. i think hissin's comments were for if you are planning have the gauge connected permanently

guys running boost seem to like to set up a fuel pressure gauge permanently, n/a guys typicaly don't see a need for one.

The BBk one has it, my buddy has his gauge on his bbk fpr

drakesdad · Nov 25, 2006

SeventyMach1 said:
Back from the dead!

Will, you said you got a Kirban @ Summit. Did they stop selling them or something? (looked & seen nothing but Aeromotive, BBK, & Accel)

yeah. look through my "serious" posts and find all kind of stuff for TFS...actually the thread is misleading......I bought the guage from summit and the summit guy was telling me I didn't need a adaptor to mount it...........I don't recall where I got the Kirban from, I know it was the only place that had them it stock at the time.....Blue Oval/ CJ pony parts/ and a place out of Virginia is where I've bought parts.......Summit is only 2 hours away so I love dealing with them.

SeventyMach1 · Nov 25, 2006

HISSIN50 said:
Justin, if you want, get with Dave at JD's. He's done very-right by me and had very reasonable shipping. I think his Kirbans are 85 bucks or so if that sounds decent.................

Thanks guys. JT ... I will keep them in mind for this. I already have to get a couple of things from them. I was searching through some vendor posts and I saw Danny mention Arts Performance. They have a Kirban listed for $78. If they're out of stock, I will try JD's.

Kirban AFR.....just checking if I got it right.

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