this came up recently from Deatschworks:
https://www.miataturbo.net/forum/t30...ight=injectors

 

above 2K rpm, sure, but he's going to have a bitch of a time idling as it is even with sequential injection, low impedance, and high res all helping him. and I'm almost positive the MS1anything cant do sequential anyway.

 

I agree that it is going to be quite and ordeal trying to get the car to idle. However, idle quality is below power capability on the list of priorities. I had a surging idle for 9 months before i actually decided to do something about it.

 

Why not get two sets of four 550's?

You can idle one set of 550's better, and then use the second set to provide extra fuel when you need it. Yes it adds complexity, but it may provide more accuracy and stability.

 

I can set you up with a great Adaptronic that does staged injection

Georgetown IN. I only put Louisville KY because no one knows where that is. You ever head up to the peaks to do some boarding?

 

That's a viable idea i just dont know what intake and fuel rail i would use.

 

I've been up there once. Not much of a snowboarder.

 

I was going to suggest this as well. the mspnp can do it. I breifly talked to Matt at Diy about it. you said this was your 4th set of injectors? what all do you have laying around? you could use them, or you could just get two 1000cc injectors and run them on your boost map. that way you would end up with slighly over 4000cc capacity. It would cost less that way. with a bit of carefull machining you could run the "boost" stage as shower style injectors from the side of the plenum. fuel rails are not hard to build and can be done fairly cheaply.

 

Let it idle at 2K and run 1K cc high ohm. Or get MS2 and run 1000cc low ohm and still have your idle.

Or get something like a 550 or 650cc high ohm and a RRFPR. Idle at say 45PSI and let it go to 80-90 in full boost. At say 90 PSI, a 550cc = 700 or thereabouts. Do the math, but this might work with MSI. **** two fuel rails and two sets of injectors.

 

I have sold all of the old injectors. All i have now are 550's. I'm not sure why i would need to do all that if i am able to idle 1000cc injectors. They are not too terribly expensive.

Why not run 1kcc with my current ms1?

I have considered going the rrfpr route but that still doesnt net me enough fuel for 400whp. That is my ultimate goal and i dont see any sense in purchasing anything that will not support that.

 

You'd have to run high ohm 1000cc injectors. You will not be able to idle them for ****. Duh. If you can accept a 1500RPM rich idle, go for it.

 

With the MS1, even with HR code, the fuel resolution isn't quite as good as with an MS2.

A compromise position, assuming you already have an MS1 and don't wish to convert, would be to run low-z 1000cc injectors along with the JBPerf Peak & Hold driver board. This will allow you to run low-impedance injectors on an MS1 with HiRes code, as the work of controlling injector current is done in hardware on the driver board. Actually, I'd somewhat prefer this to doing it on the main board, even with an MS2, as it keeps the noise of the injector drivers out of the main assembly and lets you run separate injector grounds, just like a "real" ECU.