2nd Generation Specific 1986-1992 Discussion

What size fuel injectors do i need?

Old 10-04-2006, 09:44 AM
  #1  
Senior Member
Thread Starter
 
Join Date: Jul 2004
Location: Yardley, PA
Posts: 290
Default

OK well i am in the process of building up my 88 TII, I will start with telling you what kindof parts i am using.

I have a T70 turbo and a stainless steel turbo manifold, 50mm wastegate, fmic, the motor will be freshly rebuilt with a moderate street port, 3" downpipe presilencer and 3"catback. I also have a walboro fuel pump and an hks pfc fcon. Which will handle between 10-14 psi. All emissions have been removed. My question is what size (primary, and secondary) injectors will i need to support that boost?
rx7man629 is offline  
Old 10-04-2006, 10:36 AM
  #2  
Senior Member
 
Join Date: May 2002
Location: California
Posts: 22,466
Default

get 1 big motec injector, 3000cc!



um i'd think 550/1000 would be good, or 4 x 720's
j9fd3s is offline  
Old 10-04-2006, 02:18 PM
  #3  
Senior Member
Thread Starter
 
Join Date: Jul 2004
Location: Yardley, PA
Posts: 290
Default

i have Two 720's that were going to be used as primary's and i have two 850's that i was going to use as secondarys, do you think that is enough fuel? Also what kindof hoursepower numbers can i expect to see with my setup?I am also putting in a 12 pound atc flywheel, and a street-strip clutch.
rx7man629 is offline  
Old 10-04-2006, 02:43 PM
  #4  
Senior Member
 
Join Date: May 2002
Location: California
Posts: 22,466
Default

@14psi it should be making 350-360 at the flywheel.



those injectors should be good for around 340ish hp



these are approximate #'s too....
j9fd3s is offline  
Old 10-04-2006, 06:17 PM
  #5  
Senior Member
Thread Starter
 
Join Date: Jul 2004
Location: Yardley, PA
Posts: 290
Default

Sweet, eventually i want to go with a standalone, but considering its my first turbo RX7 i think this set up is just fine, so with those injectors i should make good power without running lean? also i will not be running a steady 14psi i will be somewhere in the 10-12 range. I am also going to run water injection to be on the safe side. What is a good fuel pressure regulator to use with my set up? Like i said i am still learning things as i go, this is my first turbo car and i have plenty of questions. thanks for you help
rx7man629 is offline  
Old 10-04-2006, 06:40 PM
  #6  
Senior Member
 
Join Date: Oct 2003
Location: Boston Ma.
Posts: 1,420
Default

Originally Posted by rx7man629' post='839616' date='Oct 4 2006, 07:17 PM
Sweet, eventually i want to go with a standalone, but considering its my first turbo RX7 i think this set up is just fine, so with those injectors i should make good power without running lean? also i will not be running a steady 14psi i will be somewhere in the 10-12 range. I am also going to run water injection to be on the safe side. What is a good fuel pressure regulator to use with my set up? Like i said i am still learning things as i go, this is my first turbo car and i have plenty of questions. thanks for you help
You need a standalone. I dont think you will be using those injectors to capacity, and you will have problems.
RONIN FC is offline  
Old 10-04-2006, 07:44 PM
  #7  
Senior Member
 
Join Date: Mar 2004
Location: Puyallup Washington
Posts: 397
Default

Ronin speaks true.
Jedi is offline  
Old 10-04-2006, 08:20 PM
  #8  
Senior Member
Thread Starter
 
Join Date: Jul 2004
Location: Yardley, PA
Posts: 290
Default

so what can i do? can i just run low boost on the stock injectors. Like i said i Have an HKS Pfc Fcon which is a piggy back fuel computer.u still dont think i will be ok with that wired in.
rx7man629 is offline  
Old 10-07-2006, 07:57 AM
  #9  
Senior Member
Thread Starter
 
Join Date: Jul 2004
Location: Yardley, PA
Posts: 290
Default

^^^^^^^^
rx7man629 is offline  
Old 10-07-2006, 12:02 PM
  #10  
Senior Member
 
Join Date: May 2002
Location: California
Posts: 22,466
Default

people have run an fcon with a full t4 before, in fact theres even a chip for it. i think its doable if you're running under 10psi, but its not really the best or safest setup around
j9fd3s is offline  

Thread Tools
Search this Thread
Quick Reply: What size fuel injectors do i need?


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.