i am sick and tired of taking apart my TB every time i want to change my FP.

i did a search for en external AFPR, but didn't come up with anything good.

what are the possibilities?

looks like i need to make a block off plate for the existing one, then install the new one on the return line? am i correct?

anyone have any experience, or a website that has some info? any suggestions on which aftermarket AFPR i can use?

thanks...

-brian

 

Yes there is an alternative. Replace your throttle body with a Holley 502-5 for the 305 or the 502-6 for the 350. The AFPR is right between the injectors in the pod in the middle. All you need is an allen wrench to adjust it.

 

If memory serves me right: gut the stock fuel pressure regulator and put and external one on the return fuel line. I'd say serch under Pablos name but he has so many posts it might be impossible to find.

 

i have that thorttle body...it is garbage. well, the injector pod is anyways.

i am using that base with the GM pod with better injectors. i WISH it was that easy with the GM pod.

-brian

 

One of the guys on the Astro/Safari forum made a block off plate and used a Mallory 3 port return-style regulator.

He's got the block off plate where the OEM regulaotr is, and a pipe plug where the OEM return line was coming out of the fuel metering assy.

 

middle of page.............http://www.turbocity.com/TBIPowerMain.htm....

 

yeah, but that is still adjustable from under the throttlw body. i am looking for an in-line type regulator.

-brian

 

you dont have to remove the tbi tho, just your air box then reach your hand under and trun the dial, works for me anyway

 

really???? you can reach that from the back of the TB? sorry man...i didn't think that you could.

hmm maybe i will check that out.

thanks...but ideally i still would like an inliner, so if anyone has ideas, let me know.

-brian

 

I have the Turbo City AFPR (and ported throttle body) on my 92 RS.
It's easily adjusted by just removing the air cleaner and twisting the ****.
-Rich-

 

Try this:

https://www.thirdgen.org/techbb2/sho...highlight=afpr


I can turn it by reaching in with my fingers and only removing the breather.

 

sweet...thanks man.

-brian

 

Why is it garbage? Seems to work great for me. easy 10 to 20 psi with no troubles, just a 4mm allen key. GM injectors on it so no problems with injectors having fits.

 

yeah, yours must be the new style with the GM injectors..mine doesnthave them. it'sare the old style one. the chrysler ones or whatever.

does anyone know when the made the switch? i purchsed mine in june of 2000. it's the 502-6.

does this mean that on the newer ones that you can replace the injectors with any GM style injector? if so, i wonder if i can get just a pod from holley?

if anyone can give me this info it would be greatly appreciated.

-brian

 

Don't you have the 17112560 injectors and the GM vacuum reference regulator? You shouldn't need to adjust the psi other than getting WOT correct. I'd imagine you are with in 2-3psi of having enough fuel.

The HT502 conversion kit made 330 hp with those injectors and regulator.

I guess I'm just curious why you need to adjust FP.

 

i am assuming that you are talking to me...if not then ignore this post

yeah, i have the VAFPR and 80 pound injectors. but, i am learning to make my own chips, which means i dont need the vafpr any more. i can do it all right in the software...and it will be more accurate, and i can make small changes at certain RPMs, etc.

-brian

 

i seem to remember hearing that the vacuum regulator will help in tuning chips. I would keep it, and tune your own chips. Shouldnt hurt anything anyway.

 

I'd use the regulator you've got. It will probably make tuning idle much easier and its already got enough or very close to enough pressure for WOT (18-19psi).

The HT502 kit came with a custom prom also so I tend to think they needed that vac reference regulator.

 

oh ok..i was under the impression that it was better to have a "set" fuel pressure when doing EPROM tuning.

well, while we are on the subject...where is a good vacuum port to get the vacuum signal from for the VAFPR?

-brian

 

i think you want constant manifold vacum, splice off your map?

 

You're half right. You want to splice off the map sensor vac line which is tapped into the back of the throttle body. The constant vacuum source is actually used for stuff like the power brakes and climate controls, not sure about cruise because I don't have it anymore .

 

cruise vacuum is affected by the throttle blades, when closed there is little to no vacuum. vacuum increases as the blades are opened and air rushes by the little slit in the side of the bore.

so definately NOT what you want it tied off of for the vacuum reg or you would have what you want for wide open throttle fuel pressure at idle and idle fuel pressure at wot.

at least this is how the cruise vacuum is on the small block tbi. Wait or am i thinking of the thermac vacuum? Damn, I cant remember, I would have to go look, which i cant do right now.

anyway, listen to jon.

 

haha ok...

what about the spring situation? i know this has all been covered a while ago, but i wonder whatyou guys have to say now. i am assuming that some more experimentation has gone on with the vafpr since that monster thread a few months ago.

-brian

 

IIRC, people were discussing changing the spring because the original spring resulted in too much pressure for their application (ie - less than 330hp).

This shouldn't be an issue for you because your combo of injectors and regulator was used by GM to make 330hp. You will need the full pressure the regulator gives you unless you have some part(s) that restrict the engine (aka stock exhaust, etc).