I have a supra twin turbo pump in my tank but i was wondering if i need to upgrade my fpr since i will be uprading to 1200 secondaries on an rtek 1.7 for a while. I think i remember reading that the stock fpr is good for up to 300hp but i cant find that thread anymore. Any advise?

 

you will have to control the 1200 secondaries..it will Gag the engine.(SAFCII,maybe?).You'd be tryin to toss in about 55% more fuel than what the RTEK is handling(720 secondary on Rtek 1.7)
and Ya,it would be better to throw on an aftermarket FPR.

 

...Yikes, what do you get like 7 mpg? 9 maybe? .

A walbro will overpower the stock fpr, basically any pump that flows more than an FD pump will over power it. The Supra pump is manhandling your stock pressure regulator, bassically making it useless. Speaking of useless.... 1200cc injectors on an rtek 1.7.

Why?

 

^ Ya fuel would be pouring in there. Well i was thinking why Get 720 when I want to upgrade my turbo later anyway. 720 is a lot more reasonable for the time being though. 1200 is over kill i know, but i Just didnt want to spend the money on injectors twice. One step at a time i guess though.

Even with 720 should i upgrade the fpr? i was thinking about aeromotive since ive heard good things about them. Only thing is the one I keep hearing about is the A1000. Thats a -6 line conection. Maybe i should do some more homework on their products.

If i do need to upgrade the stock fpr how can i remove it? Its part of the rail.

 

The FPR is removable on s4 fuel rails. You could get that, or cut and weld on your s5 rails, or you could get a set of aftermarket rails.

http://www.mazdatrix.com/C-FPR.HTM

 

^ noted. The after market Rail sounds like a good idea. More expensive also.

Im doing a little homework and I found that most of the after market fuel rails require a "Bosch Style" injector. From waht i gather all that means is that the top part of the injector is a little bigger than our stock Densos. So 14mm vs. 11mm. Here are a couple of links i found.

http://www.rx7store.net/product_p/secrailfc.htm

http://www.rx7store.net/product_p/secrailfc.htm

Heres one more from RC injectors to cross ref the two types of injectors. They both come in low impedence so I guess that makes it safe for the ecu to work with.

http://www.rceng.com/Peak-Hold-Fuel-Injectors-C5.aspx

 

Not sure what the advantage is of a aftermarket FR vs. S4 feul rail.

Riz.

 

if you really want an aftermarket Fuel rail setup, you should check out RisingRPM. They use the stock denso 11mm tops injectors.

 

^ +1

Rising RPM

You can't beat this quality for $119.95

 

Well the aftermarket rail is just an idea but Rising RPM makes it kinda worth while. I just looked up the website. They seem to make good products. They dont have that big of a selection so far but still so far so good. check it.

http://risingrpm.com/

 

i've run the stock FPR's up to 450whp, not that i advise it but 350 is where i usually recommend ditching it and getting something larger and more capable.

the regulator is a basic bottleneck which can be tuned around, as long as it is consistent.

 

^ ahh there it is. Well the thing im thinking about now is, Can there be a possability of fpr failure? Mine is pretty old by now. So Thats anothere reason to consider the after market stuff. Im not dead set on it though. If i can avoid it than i will.

 

The diaphragm can rupture. When it happens, fuel will pass into the vacume port. Some aftermarket fpr's are rebuildable for this reason. Not saying that's your case, but just saying.

http://aeromotiveinc.com/tech-help/f...fi-regulators/

 

Thanks for all the info.

so someone on here said that 1200cc injectors spray about 55% more fuel. How much more fuel than stock do 720s spray?

 

you can use S4 TII rails on an s5 TII lower manifold if you put a couple washers under the fuel rail(4mm).S4 primary rail is a swap.(use the black plastic stock spacer)
this is a cheap solution so you don't spend 120 on fuel rails.
Plus the S4 rails can be modified to accept A/N fittings and aftermarket hose.They are threaded at each end.Basically like an RPM rail.(RPM rail accepts NPT threaded stuff)

 

^ Ya. thats what someone was saying earlier.

What I like about the Rpm kit is that it includes an oil block off that can connect oil guages. Its $120 for all three parts. Its probabaly easier to get a hold of than the S4 turbo rails too. Ive been looking through For sale section and I havent found any rails so far. Haha

 

Rail is $120 but you still need to plumb it (if money is tight )

To answer your other question if you have a supra tt pump it is good for 500hp on pump fuel

 

It costs $179.95 for the the two fuel rails and oil pedestal. It costs $119.95 for the two fuel rails without the oil pedestal.

I have some extra S4 rails that I don't need. They have nothing on them. (No pulsation dampener or fuel pressure regulator.) - PM me if you're interested.

 

and the main reason that the regulator will rupture is...... dun dun dun

age/wear and tear!

yes, the main reason the stock FPR is unreliable and is it's age. i have seen the diaphragms fail but even aftermarket units are susceptible to the same exact failure. also seen springs break on A-1000 units and rips in their diaphragms with much less age and use, granted the broken spring was on a unit with water injection where the water was obviously backing up into the line.

 

^ Right. thats what i was getting at. Its old and i dont want to run the risk of failure for some reason. My engine is new and I want to keep it running well.