aeromotive fuel pressure regulator and boost ?

[sweetk30]

https://www.summitracing.com/parts/aei-13101

https://static.summitracing.com/global/images/instructions/aei-13101.pdf

the car has this regulator on it . i read threw the directions and it didnt specify what way to hook up the ref port .

being the engine has a super charger on it should i hook up to boost pressure or vac source ?

 

[Justin V]

In the turbski world, you would reference manifold pressure.

In the supercharger world I would assume the same.

Basically what you are achieving with the rising rate is a counter balance. As manifold pressure increases, the boost tries to push the injectors out of their holes. Now, they shouldn't actually go anywhere, because they ought to bolted down...

But that same action tries to push back against the fuel that is trying to spray when the injector is activated...

With the rising rate regulator, each pound of boost adds a pound of fuel pressure.

It maintains a consistent fuel flow under a variable condition.

For example. WOT on a N/A motor is roughly atmospheric pressure versus fuel pressure.

We'll use 14.7 psi vs. 60 psi.

Add 5 pounds of boost and you have 19.7 psi versus 60 psi WITHOUT a rising rate reg.

This would result in less fuel flow as the pressure differential has decreased.

With the rising rate reg you would maintain the same pressure differential throughout the boost curve.

 

[sweetk30]

 

[Justin V]

Just make sure that the regulator sees boost reference.

Preferably it would see both boost and vacuum reference, however in a roots style application you'll not see much (if any) vacuum under throttle so boost is the main reference it needs.

 

[sweetk30]

o.k.

this blower has ports for both vac side and boost side .

 

[Justin V]

if you got fancy with check valves you could allow the regulator to see both. Run a line from the vac side to a check valve that allows the vac to flow, but closes under boost. Then run a line from the boost side to a check valve that allows the boost to flow, but closes under vac. Then tee them together and run them to the regulator.

 

[sweetk30]

if you got fancy with check valves you could allow the regulator to see both. Run a line from the vac side to a check valve that allows the vac to flow, but closes under boost. Then run a line from the boost side to a check valve that allows the boost to flow, but closes under vac. Then tee them together and run them to the regulator.

not sure if the 1987 mustang computer could deal with that much info . . .

dam good idea tho .

since were on it . . . it has a gm 2bar map swapped in it from a kit years ago . should the map see vac or boost side also ?

 

[Justin V]

Well, if you want to be technical, the 87 mustang computer isn't designed to deal with boost at all.

(Unless we are talking a 2.3 turbo, which we aren't)

Which reminds me that you really need to encourage an upgrade in engine management here. 33 year old electronics in the automotive racing world is akin to still having the brick for a cell phone...

 

[sweetk30]

check valves like these at the bottom of the page ? https://www.mcmaster.com/check-valves/check-valves/check-valves-with-barbed-fittings-9/

 

[sweetk30]

Well, if you want to be technical, the 87 mustang computer isn't designed to deal with boost at all.

(Unless we are talking a 2.3 turbo, which we aren't)

Which reminds me that you really need to encourage an upgrade in engine management here. 33 year old electronics in the automotive racing world is akin to still having the brick for a cell phone...

View attachment 344971

not my car . he said it will be fine . . . i just shook my head . . . . and he said he has a guy that can tune it .

 

[Justin V]

check valves like these at the bottom of the page ? https://www.mcmaster.com/check-valves/check-valves/check-valves-with-barbed-fittings-9/

Those should work. Just need to ensure that the vacuum side would open...

 

[sweetk30]

i am just trying to set this guy up for the least amount of fail possible with the parts he picked .

old combo was a 302 with SVT heads and vortec belt drive blower .

new combo is built 331 stroker motor and this kenne bell flowzilla unit .

so trying to blend old and new in ways they were not setup for before has me a bit stumped .

kenne bell unit has a load bypass valve so it only builds boost under load . and its a 2.1L twin screw unit .

 

[SpeedlabDan]

I have an aeromotive regulator on my chopper and I just ran the reference line to the charge side of the manifold. Dunno if that helps but that's all I did

 

[sweetk30]

dropped a email to they and they got back to me and said since the blower has a bypass valve setup that is a perfect spot to tee or plumb in to for the regulator for this application . he also said since that port / manifold section is both vac when bypassed and boost when closed it will see both and not need a y fitting and check valves .

thanks for all the help guys .