How much HORSEPOWER can a stock fuel pump sustain?
#1
How much HORSEPOWER can a stock fuel pump sustain?
I'm currently tuning my nitrous setup (50 shot Dry NOS) and I was looking at my dyno plot from the weekend. With a 50 shot at about 800 psi (low bottle) I gained 24.8 fwhp and 45.2 tq over baseline. I'm pretty certain that these numbers had to do with 1)low pressure, 2) NOS overrates their jets and 3) drivetrain loss with my auto.
SLTi30t gained 60.9 fwhp 93.1 tq over baseline with a 70 shot Dry NOS in his 5 speed I30. He had about a 2/3 hp:tq ratio and I'm almost there meaning that my nitrous was working but for the above reasons, I was slightly lower than 2/3.
Im wondering what our stock fuel pump can sustain hp wise because most all documentation on this board says "I wouldn't run over a 60 shot" on a stock fuel pump. Well is that "60 shot" or 60 hp?
If it's 60 hp, then technically, couldnt I run about "80 shot" safely on a stock pump?
Any help is appreciated.
thanks
SLTi30t gained 60.9 fwhp 93.1 tq over baseline with a 70 shot Dry NOS in his 5 speed I30. He had about a 2/3 hp:tq ratio and I'm almost there meaning that my nitrous was working but for the above reasons, I was slightly lower than 2/3.
Im wondering what our stock fuel pump can sustain hp wise because most all documentation on this board says "I wouldn't run over a 60 shot" on a stock fuel pump. Well is that "60 shot" or 60 hp?
If it's 60 hp, then technically, couldnt I run about "80 shot" safely on a stock pump?
Any help is appreciated.
thanks
#2
It all depends on the pump, and it's a 60 shot, not 60 HP. Some people can get away with running an 80 shot on a stock pump, some people have problems even running a 50 shot. It's just not worth it to blow your motor over a $100 fuel pump. Just upgrade it, youve already put so much effort into the rest of your car...
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#3
Originally posted by mtrai760
It all depends on the pump, and it's a 60 shot, not 60 HP. Some people can get away with running an 80 shot on a stock pump, some people have problems even running a 50 shot. It's just not worth it to blow your motor over a $100 fuel pump. Just upgrade it, youve already put so much effort into the rest of your car...
It all depends on the pump, and it's a 60 shot, not 60 HP. Some people can get away with running an 80 shot on a stock pump, some people have problems even running a 50 shot. It's just not worth it to blow your motor over a $100 fuel pump. Just upgrade it, youve already put so much effort into the rest of your car...
![Wink](https://maxima.org/forums/images/smilies/wink.gif)
I guess the stock pump relies indepently on fuel psi rather than hp.
thanks
#4
Moderator running more PSI than all the boosted Maximas... combined
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The thing is nobody knows the spec of the OEM fuel pump. Liter per gallon flow at different level of pressure. I doubt the OEM fuel pump is high pressure. The flow rate will dramatcially decrease at anything above 70 psi. The OEM pump wasn't design to flow at such a high fuel pressure. I'm sure Stillen did their research with the SC kit. If the OEM pump was adequate, they wouldn't include that T-Rex external pump.
#5
Moderator who thinks he is better than us with his I30
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Let's say you get the Warlboro fuel pump, how do you keep from running way too rich when your not spraying. If I ever installed a N20 system I would only use it at the track, so I would like to keep a good air fuel ratio while NA. Is that possible with a upgraded fuel punp?
If this is a really stupid question please be kind
If this is a really stupid question please be kind
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#6
Originally posted by I30tMikeD
Let's say you get the Warlboro fuel pump, how do you keep from running way too rich when your not spraying. If I ever installed a N20 system I would only use it at the track, so I would like to keep a good air fuel ratio while NA. Is that possible with a upgraded fuel punp?
If this is a really stupid question please be kind
Let's say you get the Warlboro fuel pump, how do you keep from running way too rich when your not spraying. If I ever installed a N20 system I would only use it at the track, so I would like to keep a good air fuel ratio while NA. Is that possible with a upgraded fuel punp?
If this is a really stupid question please be kind
![Big Grin](https://maxima.org/forums/images/smilies/biggrin.gif)
![Smilie](https://maxima.org/forums/images/smilies/smile.gif)
The only thing I can think of is maybe a SAFC
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-hype
#7
Moderator running more PSI than all the boosted Maximas... combined
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The short answer is YES. Here's the long answer...Dry nitrous system raises fuel pressure via vacuum to the fuel pressure regulator. Most typical SC kit or turbo kit do the same thing for extra fuel. When you are off nitrous, the fuel system behaves normal. It's a known fact that the OEM fuel pressure regualtor can't regulate the pressure because the extra flow of the Walbro pumps. Most people are using aftermarket fuel pressure regulator along with Walbro pump. ie. Sard, AEM, Paxton.
Originally posted by I30tMikeD
Let's say you get the Warlboro fuel pump, how do you keep from running way too rich when your not spraying. If I ever installed a N20 system I would only use it at the track, so I would like to keep a good air fuel ratio while NA. Is that possible with a upgraded fuel punp?
If this is a really stupid question please be kind
Let's say you get the Warlboro fuel pump, how do you keep from running way too rich when your not spraying. If I ever installed a N20 system I would only use it at the track, so I would like to keep a good air fuel ratio while NA. Is that possible with a upgraded fuel punp?
If this is a really stupid question please be kind
![Big Grin](https://maxima.org/forums/images/smilies/biggrin.gif)
#9
Moderator running more PSI than all the boosted Maximas... combined
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No. You don't bypass the OEM FPR. Fuel pump is just a direct replacement. Aftermarket FPR is also a direct replacement except it's too big to fit in the OEM location. You have to remote mount it.
Originally posted by DCmax
When you install an aftermarket pump, do you bypass the stock fpr?
errr....how is an aftermarket fpr installed.
When you install an aftermarket pump, do you bypass the stock fpr?
errr....how is an aftermarket fpr installed.
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