hey guys just wanted to see what people are making on the stock fuel set up, of cause most people add a fuel pump to run higher duty on the injectors. but on the stock rails reg and injectors whats the most u have got out of them?

im making 260rwhp here in Australia on a dyno dynamics dyno at 80 duty

cheers

 

for me 321ps (close to 320rwhp) - that's where stillway stopped, limited by the stock setup (and they should know what they are doing). That's with the benefit of 102~ RON fuel though.

seriesvii over at ausrotary made ~250rwkw on the (somewhat happy) c&v dyno (321ps = 236rwkw) - and that was at some insane duty level (99% or something like that) on the stock setup. To his credit, he ran a 11.2 with that. Haven't heard anything since though.....

 

running at 283whp here on 12 psi with stock fuel setup. from monitoring the PFC, max injector duty I have hit is 89%

 

My dad's R1 makes right at 300 rwhp at 13 psi on stock fuel system.

 

was hittin in the 90s injector duty with 10psi at 275 years back...
his must be pegged with 13psi..

 

280 whp (est by S. Kan during street tune), 12 psi, 84% injector duty cycle.

 

RTS3GEN dyno'd at 357.2 rwhp 15psi stock injectors (Supra FP).

 

About 300 rwhp with mods listed below & OEM main cat.

 

I made 300 rwhp at 11 psi with the stock fuel system.

 

Man...That's crazy.

 

310rwhp @ 12, but way too high injector duty :o

 

so with a safe injector duty u guys would say about 300rwhp may be the max?

357.2 dam thats alot of hp out of the injectors must be running 100% duty

 

http://www.rx7.com/cgi-local/3rdgencalc.cgi

 

Safe is a relative term. Safe for you may not be safe for someone else. Here's a good post about injector duty cycles:

https://www.rx7club.com/showpost.php...43&postcount=7

You'll have to determine what 'safe' is for your car.

 

wouldnt it be easier to keep all the injectors the same,, but upgrade the fuel pump and fit and adjustable fuel pressure regulator to up the PSI in the rail a little?????

 

Haven't dyno'd but running 1 bar on a 62-1 and not even at 80 percent with a supra pump (haltech).

I'm running about 11.2 afr. Alot depends on how rich you tune for.

I'm in the 300's according to my time slip of 12.88 110mph

projected fuel would require me to run 16psi before hitting 80 pecent duty cycle on my secondaries. I could get more fuel if i ran primaries harder but It's a street car and 1 bar is my saftey zone.

Here is the post i asked the question

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/injector-duty-cycle-571337/

To basically sum it up I have plenty of fuel for my car. Can even go to 10's if i wanted and still be below 80 percent duty cycle.

I think most ppl just increase secondaries until they run out of room. I increased the primaires alot so they both hit about 70's instead of one set of injectors doing alot of work.

This actually makes it easier for transition on the stagging of the injectors.

Most ppl have no clue what they are talking about so I personally would do your own reaseach as this forum is really bad about wrong information and the reason most ppl stop using it once they "Get a clue"

 

311 rwhp at 12.5 lbs

 

321whp SAE corrected @ 10psi

Stock twins
Stock fuel
Bolt-ons

Yeah, I know it sounds crazy... I didn't believe it either. But since that dyno I have pulled (barely) on a 12.2 sec MR2 turbo and destroyed a (roughly)300whp s14 240 (turbo KA).

During the MR2 run I was running somewhere around 13psi.

Yes, I have a wideband.