I am having a bit of trouble finding some concrete info on stock fuel pressure. I would like to install my Aeromotive FPR for tuning next week. My car had a base tune done on the stock FPR, and I would like to run the Aeromotive as close to stock and only have it there if I NEED more pressure.

What should I set it to?

 

it's in the FAQ.

but it's 35-38psi at idle and 48-50psi at atmospheric.

 

So how would that translate to a 1 to 1 rising rate FPR? Just set it at 35 at idle without vaccum and call it a day?

 

Well that would be 45 at idle WITHOUT vacuum or 38ish at idle with it.

Dann

 

alright.

 

I'd set the pressure at idle to be around 48-50psi with no vacuum line attached.

whatever it goes to in vacuum is what it goes to. Then it will still react in a 1:1 increase just like stock. The only thing you can really change is that crossover point.

 

OK so I finished all my lines today and fired er up. If I set it to 48 without vaccum, it only drops to about 44 with vaccum. And then if I set it to 38-40 with the vaccum and pull it off it only jumps to about 44-45.

Which setting procedure would more closely represent what the stock FPR does? I'd like to have it as close as I can for now since I have to do a bit of driving around before dyno time. At the dyno I'm fine bumping it up a bit.

It's an Aeromotive dual feed BTW (one feed is blocked off). Marshall gague in the FPR.


Should I just set it static and like you said what it goes to in vaccum, it goes to? My motor is lower comp, with a lot of headwork and big cams. It dosen't pull much vaccum at idle anyways... when I first fired it up with a basemap that was tuned for a bone stock 1.6L with the same injectors I remeber it idling really rich. Would that have been because a stock motor would have brought the vaccum pressue down a bit?

 

it should drop in vacuum at the same ratio as it increases in boost. it drops to ~35psi from ~45psi or so at idle, because the stock motor is pulling around -10psi of vacuum. If you're pulling less, then you'll have more pressure at idle.

you wanna make sure you have enough up top, you can always shorten the PW at idle...