stock FPR

[a2j]

does it need to know the intake manifold pressure? should I leave the vac hose connected? top part of my firewall is pretty clean now...

[x2xtreme360]

Yes, but you don't need the crap solenoid it routes to. That's only used for hot starts. Send the line straight to the font plenum port by the throttle body.

[TUFFTR]

xtreame360 - could you elaborate on any more info you know on this? why does the TT need a solenoid for hot starts but the NA's dont? very strange.

[Ninja Performance]

does it need to know the intake manifold pressure? should I leave the vac hose connected? top part of my firewall is pretty clean now...

Yes, the FPR is a 1:1 rise FPR. For every 1psi manifold pressure the FPR rises 1psi. Without a vac/boost reference your fuel pressure will not rise and you will not have the fuel you need.

-Chris

[x2xtreme360]

xtreame360 - could you elaborate on any more info you know on this? why does the TT need a solenoid for hot starts but the NA's dont? very strange.

The solenoid is supposed to dump fuel or lean it out (can't remember which one) for hot starts. You don't need it though.

[a2j]

Yes, the FPR is a 1:1 rise FPR. For every 1psi manifold pressure the FPR rises 1psi. Without a vac/boost reference your fuel pressure will not rise and you will not have the fuel you need.

-Chris

yes, this sounds familiar, that is why I was asking. does this apply also for the aftermarket AFPR?

[Ninja Performance]

xtreame360 - could you elaborate on any more info you know on this? why does the TT need a solenoid for hot starts but the NA's dont? very strange.

It is actually for warm starts not hot. And you can remove it. I have never seen a negative effect from removing it.

-Chris

[Ninja Performance]

yes, this sounds familiar, that is why I was asking. does this apply also for the aftermarket AFPR?

Yes, and for the same reason.

-Chris

[a2j]

It is actually for warm starts not hot. And you can remove it. I have never seen a negative effect from removing it.

-Chris

so, without it, I should not have problem staring in cold/hot with e85?

[Ninja Performance]

so, without it, I should not have problem staring in cold/hot with e85?

Not in warm, hot weather. However Ethanol does not vaporize down in cold temps like gasoline so it will be harder to start in cold temps. That has nothing to do with the FPR solenoid.

-Chris