fuel pressure under boost

[AUTOMECH01]

can you guys tell me what the max fuel pressure i will need at 35lbs of boost? i am runing a Tsunami Fuel Pump, P/N 11103 and a A1000-6 Injected Bypass Regulator, P/N 13109 base fuel presure is at 45lbs with hose of i am concerned that the pump puts out a max 65lbs and 450gph at 45lbs

 

[GVR4592]

What injectors are you using and what are using to tune with? The reason I ask is, you can turn the base fuel pressure way down with large injectors and get more flow out of the pump.

 

[AUTOMECH01]

i was using a 225 walbro and 680's and a maft and safc2 on a b16g now i am going to a hx40 and 1000 injectors

 

[GVR4592]

Did you already buy the Tsunami pump?

 

[1fast97gsx]

i am concerned that the pump puts out a max 65lbs and 450gph at 45lbs

I don't understand what you mean by this? How does the pump know how much pressure it's putting out? It may know how much fuel it's moving, but if you are under load X amount of fuel is less pressure than X amount of fuel at idle.

Figure you set your base at 45 psi and you run 35 psi of boost. Generally you have a 1:1 rising rate fpr, meaning for every pound of boost fuel pressure goes up 1 psi. Setting your base at 45 psi and running 35 psi would in theory mean your fuel pressure should be at 80 psi. How would the pump only be able to run a certian psi though?

 

[GVR4592]

He's saying that the pump only flows 65 gallons per hour or 450 lbs per hour at 45 psi.

What I'm trying to find out is if he already bought the pump. It flows less than a Walbro 255 so I'm hoping he didn't.

 

[AUTOMECH01]

here are the specs Flows over 450 lbs. per hour @ 13.5 Volts and 45 PSI and the max presure is 65psi

 

[FORMONTOYA]

If your base FP is 45psi, which is at atmosphere/0psi boost, and you want to run 35psi boost on a 1:1 ratio you would add 45 + 35 = 80psi FP at 35psi boost. Since most Walbro FP max at around 70psi before they start to "crap out" if you will, at 35psi you are more than likely going to need a secondary pump, or just one hell of a pump because in order to do it correctly you should have a pump or pumps that can actually flow about 100psi for a roughly 20% safety factor.

No, your pump setup will not handle the boost you're trying to achieve.

 

[spoolup]

The pump states, MAX BASE PRESSURE is 65 PSI, they do not on the site state a max opeating pressure but you can see from the aeromotive site that the flow has decreased a good bit at 70PSI. http://www.aeromotiveinc.com/pdetail.php?prod=4 Maybe call them and ask what the flow rate is at with a base pressure of 45 and a boost pressure (maintained with one of the regulators) of 35 (80PSI total) since their chart stops 70 PSI.

 

[AUTOMECH01]

i set the pump to run with the engine off and the regulator could only get the pump to 65psi

 

[spoolup]

And that is a BASE setting IE ZERO vacuum, ZERO boost, now take a air pump and pump air into the FPR nipple and see what it can do. It should raise 1:1 but who knows how much it is flowing after 70PSI.

 

[AUTOMECH01]

at 85psi it flows 250lbs per hour

 

[spoolup]

does that meet your requirement? Are you going to use it? Have you ever looked into the dual inline pump configurations I know there was one brought up just a few days ago.

 

[GVR4592]

at 85psi it flows 250lbs per hour

That's less than the walbro 255. Aeromotive pumps don't handle high pressure's very well.

 

[daren_p]

That's less than the walbro 255

Are you sure about that? On RRE's website they list the 255HP flow at 73psi and 14v as 220.8 ltr/hr. Obviously at 85 psi, where his pump is rated at 250 ltr/hr the 255HP pump will flow less then 220. The supra 260 pump is listed at 239.75 for the same test specs.

http://www.roadraceengineering.com/fuelpumpflowrates.htm

 

[GVR4592]

Are you sure about that? On RRE's website they list the 255HP flow at 73psi and 14v as 220.8 ltr/hr. Obviously at 85 psi, where his pump is rated at 250 ltr/hr the 255HP pump will flow less then 220. The supra 260 pump is listed at 239.75 for the same test specs.

http://www.roadraceengineering.com/fuelpumpflowrates.htm

His pump is rated in lbs per hour.

 

[spoolup]

FYI heres a extended chart on flow rates of the walbro pump. http://shopping.lightningmotorsports.com/customer/product.php?productid=23

 

[daren_p]

His pump is rated in lbs per hour.

Maybe next time I should read all the words first, before I reply

 

[GVR4592]

I do the same thing all the time, then I feel like an idiot.

 

[AUTOMECH01]

so 250lph is more flow then 250lbs per hr

 

[AUTOMECH01]

i spoke to aeromotives tech and they told me in short that a 2.0 with 96 lbs injectors 1000cc at 35psi would need to use there 1001 pump and the Tsunami is to small but it flows more then the walbro.

 

[GVR4592]

i spoke to aeromotives tech and they told me in short that a 2.0 with 96 lbs injectors 1000cc at 35psi would need to use there 1001 pump and the Tsunami is to small but it flows more then the walbro.

The Tsunami flows 12 lph more than the Walbro at 45 psi, as soon as the pressure goes up(boost) the Walbro kicks the Tsunami's ass. I would stay away from Aeromotive pumps. Just get the Bosch 044, it will provide the amount of fuel you are looking for and it's more reliable than the Walbro or the Aeromotive.