Zoomspeed

What fuel system mods will I need to safely run 1 bar of boost? What order should I upgrade in and how difficult is the upgrade?

Thanks

JoeD

ECU
better fuel pump
1200 cc injectors

Zoomspeed

How much are the 1200cc injectors and how difficult are they to install?

I currently have a g-force ECU thats programmed for 1 bar of boost. Will This ECU be ok or will I need a nother one to handle the 1200cc injectors?

0piston

iTrader: (9)

Yes you need a standalone sytem ie. pfc, haltech etc
control the 1200cc sec, or else your car will run extremly rich, with black puffs of smoke when your boost comes online, which could possibly give you power loss. Alternativly, you can buy a raising rate fuel pressure regulator to increase the voluminzing effect of your injectors.

Zoomspeed

What fuel system mods can I do that will allow me to safely run 1 bar, and let me keep my current G-force ecu?

Zoomspeed

anymore input?

Tim Benton

iTrader: (1)

If you are wanting to keep the G-force ecu, then the best route is to install a rising rate FPR, that increases fuel when the boost comes on. You'd also need a higher flowing fuel pump to make sure you keep the pressure up. Don't listen if anyone says you shoud be okay with your current setup, since if you follow that advice, you'd be playing on the edge of engine replacement since the injectors would be open all the time at high rpm, high boost, not pulsing like they should. Overheat the injectors and POOF. new engine time


Tim Benton
I have one, an SR rising rate FPR, that I was going to use with my M2 ecu, but I bought the PFC and 1300 sec injectors. So now the FPR is sitting in the closet with the rest of my stuff I want to put on. List price is in the $230 range. Name a reasonable price and its yours since I don't plan on using it.

Zoomspeed

If I got a new pump and the RRFPR, would I still need the larger injectors?

Does the RRFPR have to be tuned? Around here theres no one that has experience with rx7s.

0piston

iTrader: (9)

No you would not need larger injectors if you go with a RRFPR and a fuel pump that does good at flowing fuel at high pressure i.e. walbro, bosche. From your questions, I would suggest you bring it to someone or get help from someone who knows about this, because it is very dangerous to play around with fuel pressures if you don't know what you are doing. Rotary's aren't very forgiving when you rub them the wrong way, and can give you the game over sign pretty quick...

Zoomspeed

Thats one of the problems. No one around here really knows how to work with a rotary, so as far as the 7 goes I have to rely on myself, my friends massive collection of tools, and the forum for the info.

Is it possible to get a RRFPR thats pre-tuned or anything like that?

Tim Benton

iTrader: (1)

With the RRFPR, you can't pretune it for one car or the other. Like everything else, you would have to install it, then dyno test it to see if its adding to much fuel or not enough (dangerous). As longas it adds 4x the normal amount I think you should be okay at 1bar. The stock is only doubles the fuel pressure per psi. Thats why you would need the pump.

Tim

Zoomspeed

So what options do I have if no one around here can tune it?

alaskan7

I'm in exactly the same boat too, can't we use a fuel pressure gauge to tune the fuel pressure instead of a dyno?

Tim Benton

iTrader: (1)

of course you would need to use a FP gauge, otherwise you wouldn't be able to tell what pressure you are running. I suggested the dyno since you would want to be able to 1. see what hp you are makingat certain pressure settings. 2. watch the wideband 02 sensor reading to make sure your running rich enough for the 1 bar your trying to eventually reach. You could use a g-tech or other accelerometer to tell if you are making more or less HP at certain pressure, but you wouldn't know if you are running too lean or excessively rich.

Tim

kwikrx7

To run 14-15 psi you would need 1200-1300cc injectors and a high flow fuel pump. I know the Power FC can control injectors but not sure about remapped ECU's (G-Force, Pettit) I think then you would also need the FPR to add fuel along with boost.