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...

 

850 primarys and 1600s will be enough fuel for 450hp+ just get a good fuel pump and fuel pressure reg..

 

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!

 

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.

 

Yes to both.

 

thanks ernie. also i have an apexi rx6a, will it make 450whp at 20 psi. i know it is small but its rated for 25psi or something like that. if not i am thinking of getting a gt35r t4.

 

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 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

 

ive got the "supra pump" with 850 and 1600 and just put down 463 to the wheels with the only problem coming from the restriction in my exhaust

 

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

 

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've seen people post about running 90% safely...... pretty confident about doing that?

 

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.

 

the fuel calculator says that with 850cc primary and 1200cc secondary, at 85% injector duty you are good up to 526 flywheel. HP.

 

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

 

i had 550 &1000 and they maxed out at 420 rwhp at 45 psi fp.
i went to 550 &1600 i have 446 rwhp , same fp , no problems .plenty to go

 

what does the rx6 turbo max out at? i am planning on running 20-22 psi to get 450whp. will that work or will i be over stressing the turbo?

 

20-22lbs of boost would most likely mean c16 fuel. Rx6 apexi turbo is abit expensive, if you want 450hp go with a greddy t78, t88, or something from garret gt series..

 

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.

 

OR pump gas and water or alcohol injection

 

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.