2:1 Boost Reference Regulators?
06-22-2010, 11:03 PM
#1
2:1 Boost Reference Regulators? Anyone know of any out there? Looking for at least two inlets, one outlet, and one return, and capable of 1000HP worth of fuel. I don't like the Holley one, plus the details on what it really can do are vague. The 1:1 ones don't really do what I would like.
Also, this is probably a dumb question, but would the pressure remain essentially at the static pressure until boost kicks in (pressure above atmospheric) or will anything above full vacuum start to make it rise? I believe it is only for boost, but want to be sure.
Also, this is probably a dumb question, but would the pressure remain essentially at the static pressure until boost kicks in (pressure above atmospheric) or will anything above full vacuum start to make it rise? I believe it is only for boost, but want to be sure.
06-23-2010, 08:53 AM
#2
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Anyone know of any out there? Looking for at least two inlets, one outlet, and one return, and capable of 1000HP worth of fuel. I don't like the Holley one, plus the details on what it really can do are vague. The 1:1 ones don't really do what I would like.
Also, this is probably a dumb question, but would the pressure remain essentially at the static pressure until boost kicks in (pressure above atmospheric) or will anything above full vacuum start to make it rise? I believe it is only for boost, but want to be sure.
Also, this is probably a dumb question, but would the pressure remain essentially at the static pressure until boost kicks in (pressure above atmospheric) or will anything above full vacuum start to make it rise? I believe it is only for boost, but want to be sure.
06-23-2010, 01:33 PM
#3
If you are planning on 1000rwhp, you probably are expecting some big boost numbers. With that being said, you do not want 2:1 reference as your fuel pressures will then go sky high & most injectors as well as pumps do not like high pressures.
FMU's or high rising rate regulators are generally to make up for too small of an injector.
If you want a properly engineered system for your application, feel free to give me a call.
FMU's or high rising rate regulators are generally to make up for too small of an injector.
If you want a properly engineered system for your application, feel free to give me a call.
06-23-2010, 01:58 PM
#4
Well I had considered 80# injectors, but starting at like 40psi off idle for good manners. Then I could go 2:1 in the FMU.
I'd prefer to use 60# ones since they idle well, but without huge pressure numbers, they might not make the power.
I'm doing a pump gas 408, turbocharged at 15psi. 1000hp might be optimistic.
I'd prefer to use 60# ones since they idle well, but without huge pressure numbers, they might not make the power.
I'm doing a pump gas 408, turbocharged at 15psi. 1000hp might be optimistic.
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06-24-2010, 12:54 PM
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yes high impedence and I believe they were 96lb at 58 psi they might be 96 at 3bar but i dont think so. Im running them a base psi of 60 and with boost i get 76 psi. I Know they still have alot left in them when i was at 800RWHP If you can wait im send them back to be cleaned and flow check up to 100psi after the 4th i can get you pinpoint info then,
06-24-2010, 05:29 PM
#14
yes high impedence and I believe they were 96lb at 58 psi they might be 96 at 3bar but i dont think so. Im running them a base psi of 60 and with boost i get 76 psi. I Know they still have alot left in them when i was at 800RWHP If you can wait im send them back to be cleaned and flow check up to 100psi after the 4th i can get you pinpoint info then,
06-24-2010, 05:48 PM
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Yes you guys did a wonderful job. LOL you should see the stares the car gets down here. Dont worry ill have some thing for you to tune again. just have to finish picking the design and parts im going to go with and get a little more time to work on it .
Last edited by BigRich954RR; 06-24-2010 at 05:57 PM.
06-24-2010, 05:53 PM
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Probably a dumb question, but when you use a boost ref regulator, and the fuel pressure goes from 60 to 76psi, for example, when the boost is at 16psi, do you simply take the injector flowrate at that psi and put it in the injector table for that boost point (kPa), or must you subtract the boost pressure from the fuel pressure and use the flow rate at that value for that kPa point? I guess if the latter is true, then when under boost using a 1:1 boost ref regulator, the values would stay constant for flow rate, since you subtract out what you are adding.
With a 1.1 FPR the injector will flow the amount of fuel of the injector is rated at the base presssure. so yes the it stay a constant flow rate. Im going to round here. 96lb at 60 psi base will flow 96lb 96lb injectors will 10 psi of boost in intake will flow 96lbs with a fuel psi of 70.
06-24-2010, 09:17 PM
#19
Thanks. Makes sense.
So using a 1:1 BRFPR as you sit at idle, the flow is maximized since you re at base fuel pressure and the engine is at vacuum. Then as you open the throttle, fuel rate goes down because the base fuel pressure stays the same, but manifold pressure increases. Then when you are actually at boost, the fuel rate begins to stay constant....right?
So using a 1:1 BRFPR as you sit at idle, the flow is maximized since you re at base fuel pressure and the engine is at vacuum. Then as you open the throttle, fuel rate goes down because the base fuel pressure stays the same, but manifold pressure increases. Then when you are actually at boost, the fuel rate begins to stay constant....right?
