I'm curious to see how many people are running (or run occassionally) 20 psi or more. I would like to know how much boost you run and what size injectors you're running. Also, what fuel do you like to use at these higher boost levels. If you know your HP level at that boost, that would be interesting to know also.

So far, the most boost I've ran is 17 psi on 93 octane pump gas. I made 440 rwhp. I run 550/1600 injectors (but I'm about to replace the 550s with some 850s).

Just curious, how much boost will 550/1600 injectors support? What about 850/1600?

 

I would think its more about the octane of fuel your using than the amount of fuel you can provide at higher boost levels. rx7.com has a fuel calculator that can give a good guess at what size/duty cyles will generaly support.

 

According to rx7.com's fuel calculator, I'm already maxing out my 550/1600 setup. It said they would support 519.3 flywheel HP (approx. 441 rwhp). It said 850/1600 would support 591.7 flywheel HP (approx. 503 rwhp). I would think 22 psi would be enough to make 500 rwhp, so that calculator is telling me I'll need more than a 850/1600 combo. Would running bigger than 850cc in the primaries cause idling issues or would you just go with additional injectors and put the 850s in the primary location?

 

I run 1300/1600 injectors. Only like 15 psi right now at like 430 rwhp w/ good temps. My idle is perfect. Obviously, i plan on upping the boost huge on race gas.

 

I might have to look at going with some 1300cc injectors in the primary location.

Do you use the Power FC?

 

Nah, haltech e6x. I figured I'd be ready when the time came. Or If I wanted to use no2 etc etc.

 

I'm not sure how the Haltech layout is, but is the fuel map data in it translatable for the Power FC (meaning, does it display a 20 x 20 map)? If so, that would be some good info to have to use as a base map.

 

Im pretty sure you could look at it and feel out what you'd want to do with your setup. Its pretty presentable.

 

are you using a fuel pulsation dampner? Aftermarket rails? what pump and FPR if you don't mind me asking...

 

First I suggest you use Max Coopers fuel calculator as it gives you a better idea of what you need and have to work with. 850X2 and 1600X2 is plenty of fuel for a lot of power. What kind of pump and pressure are you currently using?

 

428hp stock ports, 19.5psi. w/550/1680's.....

 

I'm running a Supra intake combined with a Vortech T-Rex inline.

 

It looks like I need to go ahead and get the 1300s rather than the 850s.

 

If you are going to go that route just get another set of 1600's. Lots of people complain of problems with the 1300's. You may want to look into getting a different ECU because it's going to idle and get mileage like a bitch!
What kind of HP are you shooting for anyways? 850/1600's should be good for 600 rwhp! More than your turbo could probably make!

 

Both calculators I've used said that 850/1600 would only support a little over 500 rwhp. I want to run around 22-23 psi, which is enough to make over 500 rwhp. So, I figure some 1300s would cover it and leave me at a desirable duty cycle on my injectors.

A T-78 is good for over 600 rwhp.

 

Don't forget the BSFC and fuel pressure come into play. I think 850/1600's would be more than enough for 23 psi. I would be more concerned with your fuel pump which isn't going to cut it with that much boost. You're going to want to look into a different pump or a dual pump setup. A T-78 might make 600 rwhp on a Supra, but there's no way it will make that much on 13B rotary. You're going to want a T-88 for that.

 

I don't see why a Supra pump combined with a Vortech T-rex inline pump won't be sufficient for that boost level.

I might be mistaken, but I'm almost positive that a T-78 will break 600 rwhp on a RX-7.

 

Opps, sorry didn't notice the Vortech. If you can show me a single RX-7 T-78 600 rwhp dyno sheet, I don't think it will flow that much on a 13B. 500 hp is no problem with enough boost, 600 is a whole other ball game.

 

Hey Roy.....long time no see bro..
I ran up to 25psi on 550primaries 1600secondaries and the duty cycle was at 90% (old KKK setup) so I figure bout the same with you.
T78 might make 600rhwp with a photoshop'ed dyno, but not in real life....lol... ITs just too small.

 

Good to hear from you too! I may go ahead with some 1100s I found for a decent deal. The calculator shows 1100/1600 combo good for approx. 685 flywheel, 582 rwhp. That'll help drop the duty cycle down some at the higher boost range over my current 550/1600 combo.

 

That things is guna be tough to make idle at near 800rpm.

 

Just up the base pressure a bit and go with one of the Bosch motorsport in-tank pumps (the one used in the Porsche GT1, www.ntechengineering.com has them). That way you can run smaller primaries and idle won't be a concern.

 

I'll be using 4x1600 secondaries and 2x550cc primaries

 

850/1600s are good for over 600rw
everything glassman said is right on

id be worried about the fuel pump more than your injectors

im running 850/1600 and twin supra pumps and my inj duty cycle is at 75% with 20psi on a 62-1 which kicks the **** out of a t78 all the way to 18psi

Yanni

 

What HP are you making at 20 psi?