how much fuel for 450+whp...?
#1
how much fuel for 450+whp...?
looking for a fuel system for 450+whp. i have 550/1200s right now and i dont think thats is going to cut it. i have been looking into a 1600 fuel kit. but i heard you get a slight stumble with the transition. also is 550/1600 enough for 450+whp? thanks in advance. btw did some searching and couldnt come up with the answers i was looking for...
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You'll be fine with 550primaries and 1600 secondaries. I had this setup on my red car when I ran 10.7. If you have a good tuner, you won't notice the transition either. Make sure you run a good fuel pump and your good to go. Good luck!
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Originally Posted by smg944
i have the ND fuel pump, same as the supra tt, that should hold it right? btw will 850 primarys help with the stumble if i cant work it out with the 550s? thanks for the imput.
#7
Weird Cat Man
550/1600 will get you there -IF- you can keep the fuel pressure up high enough near redline.
I run 550/1600 with the Supra Nippon Denso pump, and my fuel pressure starts dropping a little bit up near redline. It definitely couldn't do much more than my 406 rwhp before it would be at 100% duty. If I try to bump up the pressure, it might work, but it would probably still fade at redline. I run 36 PSI at 0 manifold pressure now.
If you re-wire the fuel pump (bypass the skinny factory wires) this might keep your current up high enough where you don't experience dropping fuel pressures and that might let you reach 450+ rwhp on the Supra pump.
So 550 or 850 + 1600 secondaries will get you there, but the fuel pump and pressure has to be up to the task too
*edit*
If I was going to be at 400-450, I'd go with 550/1600 ... if I was going for 450-500, I'd lean towards the 850/1600 combo because it leaves more room. Either setup can be tuned to be smooth-driving if you know what you're doing.
I run 550/1600 with the Supra Nippon Denso pump, and my fuel pressure starts dropping a little bit up near redline. It definitely couldn't do much more than my 406 rwhp before it would be at 100% duty. If I try to bump up the pressure, it might work, but it would probably still fade at redline. I run 36 PSI at 0 manifold pressure now.
If you re-wire the fuel pump (bypass the skinny factory wires) this might keep your current up high enough where you don't experience dropping fuel pressures and that might let you reach 450+ rwhp on the Supra pump.
So 550 or 850 + 1600 secondaries will get you there, but the fuel pump and pressure has to be up to the task too
*edit*
If I was going to be at 400-450, I'd go with 550/1600 ... if I was going for 450-500, I'd lean towards the 850/1600 combo because it leaves more room. Either setup can be tuned to be smooth-driving if you know what you're doing.
Last edited by Wargasm; 12-01-05 at 11:14 AM.
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I have a single RP Denso pump. And it’s maxed out at around 430-440, before I started dropping pressure, with a base pressure of 43 psi. (850-1680) I have since wired it to straight battery voltage with a relay triggered by the factory wiring. But I would not recommend pushing a pump this far. In my case if I have left the boost that high I would not have any fuel flow capacity left for cold weather enrichment.
Now I just need to find the time to install 2 walbors I have sitting on my bench
Now I just need to find the time to install 2 walbors I have sitting on my bench
#10
I'm running the 850/1600 combination with two nippon pumps in tank with stock lines. I put down close to 450 and still had some room to grow. Check this out, maybe it will help:
http://rx7.com/cgi-local/3rdgencalc.cgi
http://rx7.com/cgi-local/3rdgencalc.cgi
#11
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i run 850/1600 w a cosmo pump (bought from SR in 99). i haven't been on the dyno but i routinely see 90% duty cycle w the injectors. i digitally log my fuel pressure and there is absolutely no drop off. i run 41 static.
i run stock wiring to the pump, stock lines and a Kenne Bell Boost A Pump set at 20% voltage gain triggered on boost.
howard coleman
i run stock wiring to the pump, stock lines and a Kenne Bell Boost A Pump set at 20% voltage gain triggered on boost.
howard coleman
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Originally Posted by howard coleman
i run 850/1600 w a cosmo pump (bought from SR in 99). i haven't been on the dyno but i routinely see 90% duty cycle w the injectors. i digitally log my fuel pressure and there is absolutely no drop off. i run 41 static.
i run stock wiring to the pump, stock lines and a Kenne Bell Boost A Pump set at 20% voltage gain triggered on boost.
howard coleman
i run stock wiring to the pump, stock lines and a Kenne Bell Boost A Pump set at 20% voltage gain triggered on boost.
howard coleman
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I think 850s and 1200s should be fine! let me know if you want a set of 850ccs that have been cleaned and flow tested not too long ago. Im selling some for 105 shipped. Or i have a set of 850s that need cleaning im letting go for 50 shipped.
#15
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Lupe
the 90% is the very top of my run, and no, i don't like seeing the number. my car is in disassembly for the winter months and i will be going to a 3d water/alcohol setup that will drop my duty cycle approx 10% and allow me to raise the boost and advance the timing. i plan to run an ignition kill switch.
howard coleman
the 90% is the very top of my run, and no, i don't like seeing the number. my car is in disassembly for the winter months and i will be going to a 3d water/alcohol setup that will drop my duty cycle approx 10% and allow me to raise the boost and advance the timing. i plan to run an ignition kill switch.
howard coleman
#19
i already have the rx6 turbo kit. i want to keep it because i love the boost responce. the 450whp would be on c16 and only for occational track use. i plan on running 15psi for street use. i am just wondering if the rx6 turbo will handle 20-22 psi , to make the 450 whp.
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Originally Posted by ErnieT
You'll be fine with 550primaries and 1600 secondaries. I had this setup on my red car when I ran 10.7. If you have a good tuner, you won't notice the transition either. Make sure you run a good fuel pump and your good to go. Good luck!
there's only so much you can tune for. if the pump isn't up to snuff, there's no way you can tune around it, so the setup is every bit as important.
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