Fuel pump question?
- Thread starter 101prf
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- Joined
- Aug 1, 2003
307 when its new is a 190 lph pump
thats about 45gph , x 6.5lb = 292lb hr x .6 bsfc= 486 hp
in a 3600 regal thats about 11.4s
with alky figure you can extend that about 15% or to about 550hp
thats 11.00s @ 123
the 340pump @ 13v when healthy is rated 255lph and can deliver 55gph at 70 psi rail pressure 25psi boost ) thats enough to support 600 hp which will carry a 3600lb regal to around 10.7 127mph
the 60s can flow more than a single 340 can deliver ,
at 100% duty 6inj x 60lb =360lb x .6bsfc = 600 hp, some can run leaner at .55 bsfc so injectors may support 650-700 hp on race gas , or 10.3s @ 132, but you'll need more fuel if you're on a single 340
boost the pump voltage to 15v and keep the boost lower and the 340 can supply more fuel... enough to get close to maxing the 60lb injector ..i would be going to bigger injectors once it went to 80% inj duty
if you spray alky (methanol inj ) others have run the single 340 just into the 9s at 137 + adding about 20% more fuel through the twin alky nozzles , but many have come up short as no two engine combos or cars are the same , your results may vary and become quite costly fast!
if low tens are the goal and you have the rest of the build go with duals like reds double pump XPs or an external ,
thats about 45gph , x 6.5lb = 292lb hr x .6 bsfc= 486 hp
in a 3600 regal thats about 11.4s
with alky figure you can extend that about 15% or to about 550hp
thats 11.00s @ 123
the 340pump @ 13v when healthy is rated 255lph and can deliver 55gph at 70 psi rail pressure 25psi boost ) thats enough to support 600 hp which will carry a 3600lb regal to around 10.7 127mph
the 60s can flow more than a single 340 can deliver ,
at 100% duty 6inj x 60lb =360lb x .6bsfc = 600 hp, some can run leaner at .55 bsfc so injectors may support 650-700 hp on race gas , or 10.3s @ 132, but you'll need more fuel if you're on a single 340
boost the pump voltage to 15v and keep the boost lower and the 340 can supply more fuel... enough to get close to maxing the 60lb injector ..i would be going to bigger injectors once it went to 80% inj duty
if you spray alky (methanol inj ) others have run the single 340 just into the 9s at 137 + adding about 20% more fuel through the twin alky nozzles , but many have come up short as no two engine combos or cars are the same , your results may vary and become quite costly fast!
if low tens are the goal and you have the rest of the build go with duals like reds double pump XPs or an external ,
Great info!!! already figured out and all.
Wow, this Info should be a sticky!!!! thanks PACE!! :smile:
Wow, this Info should be a sticky!!!! thanks PACE!! :smile:
Also Razor also went 10.50 on a single 307.
however his tuning skills are up there with the pro's I would say.
I was also told once past 125mph. time for a double pumper.
I also have 60s and Now a single Denso with a BAP. I can get up to 17V if i need to but i keep it around 15V. still sorta on the lean side. I went 127mph @ 10.70 with a single 340 hotwired and 113oct.(single noz Alky on max)and was runnin lean, duty cycle around 95% ,lifted a head. I could have went in the Alky box and turn the gain up but i didnt think i needed to. Live and learn.
Now i have the Boost a pump and a Denso 280. Haven't been to the track yet.Duty cycle still around 90-98% playin around on 93 octane. boost 20psi. Oh yeah single nozzle. (At the Track Next time it will be c-116, Alky on Max with the GAIN bumped up more and still my single nozzle and tune up SLOOOOWLY.):smile: those are the plans anyway.
weight, 3650, @ 24psi boost on those times by the way. So Pace is pretty much dead on. last run was a 10.63.
however his tuning skills are up there with the pro's I would say.
I was also told once past 125mph. time for a double pumper.
I also have 60s and Now a single Denso with a BAP. I can get up to 17V if i need to but i keep it around 15V. still sorta on the lean side. I went 127mph @ 10.70 with a single 340 hotwired and 113oct.(single noz Alky on max)and was runnin lean, duty cycle around 95% ,lifted a head. I could have went in the Alky box and turn the gain up but i didnt think i needed to. Live and learn.
Now i have the Boost a pump and a Denso 280. Haven't been to the track yet.Duty cycle still around 90-98% playin around on 93 octane. boost 20psi. Oh yeah single nozzle. (At the Track Next time it will be c-116, Alky on Max with the GAIN bumped up more and still my single nozzle and tune up SLOOOOWLY.):smile: those are the plans anyway.
weight, 3650, @ 24psi boost on those times by the way. So Pace is pretty much dead on. last run was a 10.63.
Actually the 307 is considered the "255 LPH low-pressure pump". The 340 is the "high-pressure 255 LPH pump". The source is here:
Auto Performance Engineering - Walbro fuel pumps specs
If you look at the chart on the following page,
http://www.turbobuick.com/forums/e85-technical-forum/280408-fuel-pump-injector-flow-graphs.html
you'll see that at 70 psi the most the 307 can deliver is about 50 gph, or enough for 50 # injectors at 100% dc and 25 psi boost. This equates roughly to you running your 60 #'s at about 83% dc.
If you have enough air flowing to accomplish your goals at 20 psi boost, the 307 pump delivers enough at 65 psi for 55 # injectors at 100% dc.
A 340 (or 0169) will net you about 6 gph more at both those points.
Auto Performance Engineering - Walbro fuel pumps specs
If you look at the chart on the following page,
http://www.turbobuick.com/forums/e85-technical-forum/280408-fuel-pump-injector-flow-graphs.html
you'll see that at 70 psi the most the 307 can deliver is about 50 gph, or enough for 50 # injectors at 100% dc and 25 psi boost. This equates roughly to you running your 60 #'s at about 83% dc.
If you have enough air flowing to accomplish your goals at 20 psi boost, the 307 pump delivers enough at 65 psi for 55 # injectors at 100% dc.
A 340 (or 0169) will net you about 6 gph more at both those points.
- Joined
- Aug 1, 2003
the gss307 fell off fast once over 65psi due to the bypass releif spring , red armstrong was cutting into them and shimming the spring in his XP pumps preventing the bypass from opening at 65
with the 307 45gph is a fair estimate of its deliver capabilities at 70psi (25 boost) keep in mind those flow ratings in the charts are free flow at the pump , in real world the pressure at pump is not the pressure at the rail due to the restriction of the stock lines and filter, or just add a volt booster and at 15-17v the pump will flow more, probably close to the 340 at 13v
and id guess razors 307 was a reds and pushing alky as well for that 10.55 , and that was also in sleeker (though not lighter ) TTA
with the 307 45gph is a fair estimate of its deliver capabilities at 70psi (25 boost) keep in mind those flow ratings in the charts are free flow at the pump , in real world the pressure at pump is not the pressure at the rail due to the restriction of the stock lines and filter, or just add a volt booster and at 15-17v the pump will flow more, probably close to the 340 at 13v
and id guess razors 307 was a reds and pushing alky as well for that 10.55 , and that was also in sleeker (though not lighter ) TTA
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