Which Fuel Injectors fit? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 05-09-2012, 08:29 PM   #1
Junior Member
Thread Starter
iTrader: (10)
 
Join Date: Jun 2011
Location: Detroit Burbs
Posts: 300
Total Cats: 3
Default Which Fuel Injectors fit?

Ok, so I have read this thread:
http://miataturbo.wikidot.com/fuel-injectors

In it, there is a list of injectors that are PNP for a Miata. And, also a list of PNP injectors that are Low impedance.

I am looking for a set of injectors for my turbo build. I am incredibly cheap. So, I am looking for a set of injectors with the following qualities:

-Must fit stock Miata 1.8L fuel rail and intake.
-OEM from some vehicle - making them really cheap used.
-Want to make ~250hp so looking for roughly 440cc
-Need to be high impedance. Using an aftermarket ECU (ProEFI) that does not have the capability of driving low impedance injectors. I don't want to use resistors inline ('cause it is super hack), and I don't want to spend the cash on a separate peak and hold driver
(like this: http://www.jbperf.com/p&h_board/index.html#Buy).
-Does not need to have stock oval injector clips. Since my car is a '90 and is batch fire, I will need to rewire the injector harness to go sequential anyways. So, no big deal to replace the injector clips.


I have a set of '87 RX7 440 injectors, a set of DSM blue top 440's, and a set of Supra 7MGTE 440 injectors. All are low impedance, so not doing me any good right now. Looking to sell any of the above if anyone is interested.

Really just looking for a list of high impedance injectors with the correct dimensions to fit the rail, but don't need the miata injector connector. So, i'll call it PNP-lite.

Any ideas?
Frank_and_Beans is offline   Reply With Quote
Old 05-09-2012, 09:56 PM   #2
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,892
Total Cats: 1,792
Default

Omg dude.
Braineack is offline   Reply With Quote
Old 05-09-2012, 10:58 PM   #3
Senior Member
iTrader: (3)
 
Join Date: Nov 2009
Location: Royal Palm Beach, FL
Posts: 725
Total Cats: 5
Default

all of those fit lol. um get 460cc red top injectors. there is a pnp which plugs right into the stock harness and there is a version like mine that needs a pigtail and some sanding on one side.
Clos561 is offline   Reply With Quote
Old 05-10-2012, 07:24 AM   #4
Junior Member
Thread Starter
iTrader: (10)
 
Join Date: Jun 2011
Location: Detroit Burbs
Posts: 300
Total Cats: 3
Default

I am really looking to expand the pool of available injectors - instead of just 89-91 RX-7 or RX-8 injectors.

Can I find some injectors from the PNP list for sale? Sure, there are some for sale right here on this website. But, I'm not in a hurry to get them right away, so I would like the chance to look around for a good deal (see my first post about being REALLY cheap). The more injector types available that fit, the more likely I can find some for a good deal.

Are there distinguishing features about the PNP injectors that make them so unique that no other injectors will fit?
Frank_and_Beans is offline   Reply With Quote
Old 05-10-2012, 08:22 AM   #5
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,107
Total Cats: 518
Default

PNP = plug and play. Not a brand. You want cheap, but you won't use the 440s you already have. You think resistors are hack, but you're makin your own sequential harness. I'm
Lost.
curly is offline   Reply With Quote
Old 05-10-2012, 09:15 AM   #6
Junior Member
Thread Starter
iTrader: (10)
 
Join Date: Jun 2011
Location: Detroit Burbs
Posts: 300
Total Cats: 3
Default

Quote:
Originally Posted by curly View Post
PNP = plug and play. Not a brand. You want cheap, but you won't use the 440s you already have. You think resistors are hack, but you're makin your own sequential harness. I'm
Lost.
I thought my post posed a fairly straightforward question. Guess not.

If an injector fits the intake/fuel rail, but doesn't fit the electrical connectors - would you still call that PNP? I was under the impression that it wouldn't be considered PNP, which is why I am specifically asking for injectors that physically fit, yet don't have the same electrical connectors. If the PNP list already includes these types, and no others will fit, just let me know, and I will go on my happy way.

Resistors are hack for several reasons. They require a giant box to house them that needs to fit in the engine bay somewhere, and also create poor injector control. The resistor limits the amount of current going to the injector, which makes the opening time extremely unpredictable. This would be most noticeable at idle, as the pulsewidths at idle are small, so the variation in actual injection time is a large percentage of the total pulse. At higher loads and WOT, the pulse length is large enough that the opening variation has a much smaller impact on the total fuel flowing. In conclusion - I don't want resistors.

I don't think making a new Miata injection harness is super hack - as the injection harness is a completely separate harness that plugs into the main engine harness. Should be fairly easy to update it. Or maybe not? Anyone have some pictures of an updated 1.6 sequential injector harness?
Frank_and_Beans is offline   Reply With Quote
Old 05-10-2012, 09:45 AM   #7
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,892
Total Cats: 1,792
Default

Quote:
Originally Posted by Frank_and_Beans View Post
Anyone have some pictures of an updated 1.6 sequential injector harness?

yes, mine. it looks exactly like the factory injector harness, but for two extra wires running to it.
Braineack is offline   Reply With Quote
Old 05-10-2012, 12:41 PM   #8
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,107
Total Cats: 518
Default

I see your points. That list mentioned in the DIY post is by no means complete, nor is it completely physical/electrical* PNP. They're all physically PNP, I'm fairly certain a few of them are electrically not PNP.

If you want something cheap thats both physically and electrically PNP, buy RX-7 460s. There are troves of rx-7 forum members willing to sell theirs as they upgrade for dirt cheap, we're talking sub $50 shipped. If you're willing to wait like you say you are, that's your ticket. Find them in a junk yard for even cheaper.


*let's ignore the fact that the electronic injector clips need to physically fit for argument sake?
curly is offline   Reply With Quote
Old 05-10-2012, 10:47 PM   #9
Junior Member
Thread Starter
iTrader: (10)
 
Join Date: Jun 2011
Location: Detroit Burbs
Posts: 300
Total Cats: 3
Default

Can you throw me a bone and link me to this wonderous RX-7 forum with injectors that fall from the sky like rain?
Frank_and_Beans is offline   Reply With Quote
Old 05-10-2012, 11:08 PM   #10
Senior Member
iTrader: (8)
 
Join Date: Jun 2010
Location: Navarre, FL
Posts: 1,127
Total Cats: 39
Default

rx7club.com

you have make a few posts to be able to post in the FS section I think though... i ended up finding mine for sale on here
aaronc7 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 59 Today 09:00 PM
Changing from 460cc to flow force 610cc in diypnp 90 Turbo MEGAsquirt 19 10-19-2015 04:23 PM
Going back to stock. Need some 1.6 parts. Trent WTB 2 10-01-2015 01:15 PM
Time to start learning and play with tuning The Gleas MEGAsquirt 3 10-01-2015 10:30 AM
Walbro 255lph Fuel Pump $50 lsc224 Miata parts for sale/trade 2 10-01-2015 10:17 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 09:15 PM.