Ok, I am in the process of doing the PD and lower fuel rail removal. I have done each step while taking pictures and will post a detailed description of the process. My FC could have cought fire any day now, as the famous screw in the PD was completely backed out. Below are a series of pictures of the swap, and instructions will follow. I do have a few questions for the "experts" While I have the whole TB,Dynamic Chamer, and both fuel rails off, is there anything that I should do before I put it all back together. So far I plan to clean everything, install 550cc injectors in the secondaries, replace the lower fuel rail (of course) and maybe new vacuum lines. Should I reuse the clips that go on the fuel lines or should I get new hose clamps. Mazda used those clips that you squeeze to remove. Anyone have a preference? Well, here are the pictures, and once VERY good one of a side-by-side S4 and S5 fuel rail.
-DL

 

fixed broken pic links..sorry

 

Nice pics.
Anyone know how necessary the plastic air bleeds are? Is it at all beneficial to remove them, or at all detrimental?
Sean Cathcart

 

Thanks Sean, not sure about the air bleeds. I am considering blocking off the EGR, but I wonder if I will ever pass emissions with out the EGR (assuming I put the air pump and ACV back on). Anyone know if the EGR is absolutely necessary to pass emissions?
-DL

 

You should be fine to ditch it.
After all, none of the S5 cars had one, and they all passed.
Sean Cathcart

 

ok, anyone have advice on the hose clamps vs. clips? Also anything else I should do while im "in there"?

 

Good work, I’m sure lots of people will appreciate your efforts!It’s been said before, but there’s really no need to do this. The stock 460cc/min injectors flow enough fuel at 80% duty for ~250fwhp. That’s bridgeport territory! You’d also need a fuel controller with these injectors or it’ll run like a bucket of ****.Throw those POS clips away and get decent screw clamps. Much better.

 

NZConvertible, Thanks for the advice. Well one of the reasons that I want to throw the 550's in the secondaries is because they were recently remanufactured by RC Engineering. The ones I removed looked kinda crappy. Will it really run poorly without a fuel controller or will it just not reach their full potential?

 

You betcha. At full flight, you'll be pumping in about 10% more fuel than the computer thinks the engine needs. Running that rich will simply kill your top-end power. It'll cost a lot less to get your old injectors reconditioned than buy a fuel controller. Having said that, if you plan to get serious with your NA, a fuel controller will help a lot, but you still won't need 550's unless you go beyond a street port.

 

quote from HAILERS "I put 550's in my 87n/a secondaries, and I have no doubts that it runs a darn site faster, on top end especially. That said, John Gibson wrote and said I needed to get some type of fuel controller for them to be effective. Got me. He's been around and doing rx longer than I. I still, seat of the pants know its faster. Just have Mazdatrix dual from front to rear and a K and N. The K and N don't do much for me. Probably just me. Not sensitive enough. If you go out to my car tonite while I'm sleeping and put the 460's in the car, I guarantee that I'll know it when I drive to work tomorrow. There! My story and I'm sticking with it."

Go to post: CLICK HERE

 

Well I can’t explain that. All I know is that under load (when the ECU is in open-loop) the ECU has no idea how much fuel is being injected. It just looks at airflow, air temp, water temp, etc and calculates a pulsewith (the length of time the injector is to be open) by looking up preset tables. It’s only logical that a bigger injector will flow more fuel than a smaller one if they’re open for the same length of time and have the same rail pressure. So if more fuel is going in than the computer has calculated is necessary for an appropriate mixture, it should be running rich. Too rich equals slower, not faster! Perhaps Hailers can shed more light, but I’ve heard a lot more people say it doesn’t work than that say it does.