Hey guys,

Trying to sort out my fuel system, I'm not looking to change the whole system,basicly some drop in injectors and a bigger pump.so what do you guys recommend for about 350 at the wheels .looking for something streetable. Thank you guys any tips would help

 

your stock system can support 350 hp, but if u wanted a fuel system, look on this some really nice set ups! http://www.rx7store.net/

 

I've seen the systems on rx7 store. I was just woundering what size injectors should I use for my primary and secondary that would fit with the stock fuel rail? And any bang for the buck brands?

 

use the Supra TT fuel pump...(Direct drop in) ...and run 850cc Primaries/Secondaries....I had a set of primary 550's punched out to 850cc so they would fit with no modification....working perfect at 420whp....and no modifications needed at ALL!..

-Jack

 

550/1300 is a much better choice then 850/850. Better drivability and a much leaner idle.

 

The Japanese FAM Speed compagny is using stock injectors for their 500 hp road / track car... (850/850 of course)

I'm planning going the same way untill switching for E85, cheap & easy.
(I have already some 850cc)

 

Both have the pros and cons as far as injectors go. Running 850's in the primaries can create tuning issues under certain circumstances. Modifying 850's to 1300's means you now no longer have 850's for primaries later if needed. I'm not a fan of running modified injectors at all if possible. Over the years the 1300's we've seen have had a higher failure rate than just running a unmodified injector.

I say send out what you have get them cleaned and balanced if you need to modify them, get them enlarged to 750's and run 750/850 it will get you enough to meet your goals and still allow for decent tuning. It also give you room to grow later by just getting 1600's



~S~

 

Awsome thanks for the input guys... Never herd of 750cc tho

 

Where would I send them out to get them enlarged to 750cc and flow tested/balanced? Also, would these would fit the stock fuel rail?

 

Hi initial fd3s

I have 320 hp at the wheels with a Apexi catalyzer. Stock Injectors are far to be outranged. My inj. duty cycle rarely gets over 25% so you have some potential left.

Max power I've seen was on a FAM Speed tuned RX-7 FD3S with 500hp and "giri giri" duty cycle on the stock injectors (seems some guys report my info from french threads huh?). It also all depends on HOW you map the ECU. Some specialists here do a lot with the stock elements. As said on another thread, big numbers doesn't make a car fast nor guarantee you a good tune up...

If you target 350whp, you can stick to the OEM injectors but I recommend to replace the fuel pump though (I have a Nissan R34 GT-R fp which is a good mod for a reasonable price). Power Entperprise or SARD fuel pumps are good options too.

 

Hehe Kotetsu, as you can see I listen carefully about your advices, your stories ... You are a valuable source of information about the FD gurus

(maybe I haven't to tell that about FAM speed here ... ? Sorry, I didn't thought that would be disapointing or so... )

 

I always say just upgrade your secondary rail and run 1600's. It's not much more money and you keep your stock primary size for good idle and drivabilty while having plenty of fuel capacity.

http://kgparts.com/index.php?page=kgfuel

Fuel rail with adapter: $159
2x 600cc injectors : $198
2 resistors: $20

Total: $377 for a system capable of high boost on a single turbo while keeping your car driving and idling like stock.

thewird