not sure, the dyno at pettit was broken and apparently I was investing into the funds to fix it by still paying for 3 hours while we (me the customer) tried to fix it lol

It feels like 127 trap though

 

I would figure probably a little over 500 rwhp. It just seems hard to believe that a 850/1600 combo could support 600 rwhp if at 20 psi you're already showing 75% duty cycle. ErnieT said he was running 25psi on a 550/1600 combo and the duty cycle was at 90%.

It sounds like the 850cc for the primary will get me to 23 psi, but I don't want to be running a high duty cycle on the injectors. That's why I was thinking of going with the 1100s. Some people say that idling will be an issue, but I've had others say they run 1300/1600 combo and the car idles fine.

So, I still don't know which way I should go???

 

850/1600 combo is plenty for what you want...i ran 23psi with just one upgraded pump at the time and you have that plus an inline so you should be good.....so with that setup youll be fine..
Greg

 

Roy, run the 850/1600 setup and you'll be fine up to 30psi. Just watch your fuel pressure, if it begins to drop, then you know thats your pump max. But you shouldn't have any problems.

 

75% duty cycle is nothing what do you expect it to be!?
even at part throttle and some boost youll see 50 some.
When I had a fuel pressure issue I saw 99.8 duty cycle after my 1/4 mile run lol the injectors still worked perfect or you know what would have happened.

There's a long way to go from 75 to around 88 ish which is still very safe.

you'll have no problem with the 850/1600. The RX-7 store car used 1000s I believe maybe call jason and see what he thinks if you still want to do that.

I agree with ernie and said it above. I bet you'll have a fuel pressure issue problem because of the pump. I ran 2 supra pumps with a Y inside the tank to 1 stock hardline and the pressure was ROCK solid.

glad you are beefing up the fuel system before pushing its limits and good luck

 

You feel that a Supra pump combined with a Vortech T-rex inline pump is not sufficient to supply the fuel necessary to run 23 psi?

 

Roy,
One supra pump is good for 500rwhp. So if you have two of any pump, its more than enough. I only had one pump when I ran 25lbs.

 

What HP did you make at 25 psi?

 

Dunno, we never dynoed it. Just tuned it on the road with a wideband.

 

Do you think 100 octane unleaded fuel is sufficient to run 23 psi? That's what I was thinking about running.

 

I know you didn't ask me, but your answer is yes!

 

Thanks for the help!

 

I say no but im from the conservative school
why not go with some 112 or 116 for some margin of safety

making 600rwhp is REALLY REALLY REALLY pushing it
have you seen how small the engine is? my foot is longer than it

 

I agree, C-116 is what I would run. Why take chances?

 

The reason I was asking about 100 octane unleaded is there is a station right in my area that sells it. I'll have to see where I can find some C-116.

 

This might sound silly but what octane is c-16? 110? higher....

 

VP Racing Fuels Octane Rating 117

 

Not advocating it, but I have run a street ported TO4S motor @28psi for extended periods on 100 octane with AFRs around 10.0:1 Carl

 

I know for boost levels around 17 psi that many run an air/fuel of around 11.1:1. When I get ready to tune over 20 psi, what air/fuel ratio should I shoot for?

 

The same. I wouldn't go leaner than 11.5.1, but some do. You'll make more power at the expense of some reliability. Timing is where you'll make a lot of power. Be careful with the split timing too.