Regulated return question

[chris89]

Is anyone using the boost port on the regulator to raise the fuel pressure. Or just leaving it open. My buddy bought the RR kit from DI and said it didnt say anything about it.

 

[Ron's Power Stroke]

most go with out it..i have the DI KIT and do not use it..

 

[chris89]

Have you tried?

 

[Ron's Power Stroke]

never had the need with 100 nozzles..fuel psi would hardly drop...i got bigger sticks going in but at the same time i have a fuellab going in as well..i still dont think ill need to...

 

[chris89]

Alright thank you

 

[Bigsexy]

I wonder if it would really do anything to benefit the truck?

 

[littleredstroker]

Chris thank you for saving me the trouble of making a thread.

sent while trying not to blow PMRs

 

[chris89]

No problem I wanted to ask it a long time ago.

 

[Tree Trimmer]

when your where we are, already at about 62ish psi, it does no good. set it and forget it.

charles had some dyno time he used, and that was one of the things he checked. if a boost reference made any sort of a difference. it made all of zero difference.

if your dropping supply pressure, that you need to increase pressure to keep up with things, you need a better fuel pump/supply system.

 

[littleredstroker]

Sooooo... Why are they on there at all?

sent while trying not to blow PMRs

 

[Ron's Power Stroke]

the regulator was not made just for the power stroke...

 

[Tree Trimmer]

i dont know the actual numbers, so bear with me.

the cummins, for instance, with their mechanical pump, only needs, we'll say 15 psi at low rpm/low demand.

but at high demand/high rpm that 15 psi is not enough to keep the pump full. so if you boost reference it to up pressure "when your on it", the pump stays full and you get all the hp available.

on theirs, you can watch supply pressure fall off. in their instance, you dont need more volume out of the pump, you just need to up the pressure. when their stockish, i suppose i should add.

in our instance, we have the pressure already. when our supply pressure falls off, we need more volume.

 

[littleredstroker]

the regulator was not made just for the power stroke...

Lol gotcha. Duh

sent while trying not to blow PMRs

 

[09stroker]

i dont know the actual numbers, so bear with me.

the cummins, for instance, with their mechanical pump, only needs, we'll say 15 psi at low rpm/low demand.

but at high demand/high rpm that 15 psi is not enough to keep the pump full. so if you boost reference it to up pressure "when your on it", the pump stays full and you get all the hp available.

on theirs, you can watch supply pressure fall off. in their instance, you dont need more volume out of the pump, you just need to up the pressure. when their stockish, i suppose i should add.

in our instance, we have the pressure already. when our supply pressure falls off, we need more volume.

If they are dropping pressure its not from the regulator, the reg will completely close and return no fuel if it has to to maintain its set pressure.

 

[Tree Trimmer]

except if you have a high volume pump, set at a low pressure, in which case, raising the pressure will increase supply.

i might have worded that wrong, i just know it works.

friends truck cannot maintain at 14 psi. up the pressure to 27, only change, and it holds it all day long.

word that how you will.

 

[Beanhead]

Is anyone using the boost port on the regulator to raise the fuel pressure. Or just leaving it open. My buddy bought the RR kit from DI and said it didnt say anything about it.

If the diaphragm blows out in the regulator,the engine could go to WOT.Then you have a run away on RPM's.

 

[Arisley]

If the diaphragm blows out in the regulator,the engine could go to WOT.Then you have a run away on RPM's.

You sure about that?

Seems to me if the diaphram broke, It would never get a reference signal to go to high pressure. Even if the pressure did raise, it would just go to a higher pressure. High pressure doesn't mean runaway. If that was so, if you adjusted the pressure too high, the motor would go into runaway.

I might be missing something, that is why I am asking.

 

[09stroker]

If it broke fuel would leak into your intake through the reference line.

Most boost reference regulators you just set the normal standby pressure (which is what we do) so the reg only increases pressure when there is boost applied. Most in a 1:1 ratio.

This is for boosted gas motors where their injectors (low pressure) have to overcome boost in the manifold to have the same fuel pressure.