Req. for comments & questions on my turbo upgrade plan

[RETed]

Originally Posted by Pete_89T2

Planned Upgrades to support the BNR Stage 1 turbo:
Fuel Injectors: Replace all four FIs with 720cc injectors. From what I’ve read so far, these would provide more than enough fuel capacity to support my goals, and putting them in all 4 holes provides the tuner a bit more wiggle room to optimize drivability around the primary/secondary transition point, and throughout the power curve. Questions: (1) Is this true, or for my modest goals would my money be better spent elsewhere by running my stock 550’s in the primaries and just upgrade the secondary’s to 720cc? (2) Where can I source a set of 720cc injectors that are drop in replacements (mechanically and electrically) to the stock 550cc high impedance FIs currently in there? I really don’t want to mess with the stock fuel rails; but can handle the electrical mods to change FI harness connectors if needed.

Because you're using the oval, high-impedence fuel injectors, there are not too many options in terms of "drop-in" upgrade replacements.
I've only seen "Japan" (I think it was SARD?) that offers a larger fuel injectors that uses that oval plug.
Else, if you're willing to splice in a Bosch-type (i.e. older, rectangular) plug, you open up a lot more options.
Impedence isn't a problem, as you can splice in resistors to compensate for the impedence change.
GReddy offers 720's that are drop in, but use the older, Bosch plugs.
There are other aftermarket offerings, but most of them are crap - that's a whole nother thread in itself.
Just stay away from Venom and Deatchworks...

If you do replace the primaries, you run into possible cold-start issues, unless your fuel control can effectively adjusting cranking fuel delivery.
(I dunno if the RTEK can do this?)

Playing with the Rotary Performance fuel injector calculator:
http://rx7.com/cgi-local/2ndgencalc.cgi

4 x 720's give you about 280 at the wheels.

Fuel Pump: Assuming that I verify I have good voltage at my rewired stock FP, will the stock FC pump be sufficient for my modest HP goals? If not, what replacement FP do you guys recommend and why?

The stock (FC turbo) fuel pump can barely handle the stock fuel injectors @ 4 x 550's.
It maybe maxes out at around 250hp at the wheels.
This is why an upgrade fuel pump is highly recommended.
Walbro's are the cheap standard, but be careful about fakes...
Look for the "255lph" Walbros.
(The stock FC turbo flows right around 180lph - 190lph.)
(Do a web search on keywords "walbro fuel pump fake", and you get a lot of hits.)
I like the stock JZA80 Supra TT fuel pump.
It has OEM quality and reliablity - made by NipponDenso.
It flows slightly more than the "255lph" Walbros.
It drops in.
It's priced slightly more than the Walbro at closer to $200, but I think it's worth it.

Fuel/spark control:

Can't comment on RTEK, as I'm a Haltech guy.


-Ted