Suggested Injector Size - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Prefabbed Turbo Kits A place to discuss prefabricated turbo kits on the market
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools
Old 11-26-2007, 06:06 PM   #1
Junior Member
Thread Starter
iTrader: (6)
 
Join Date: Apr 2006
Posts: 259
Total Cats: 0
Default Suggested Injector Size

On a basicly stock greddy setup running 5-5.5psi what would be a good upgraded injector size? I'm selling the car soon so don't want to go crazy but figured if I picked up a set of 1.8L injectors and throw them in it would be cheap and effective. Not sure how big the 1.6L's are and how big the 1.8L's are so wasn't sure if I should just get larger than 1.8L's.

Reason being the car was leaning out slightly stock fuel setup with vortech fmu and 190lph pump. Wanted to see how different injectors would result. Same setup has been on the car for 2 years and no issues.
danscreations is offline   Reply With Quote
Old 11-26-2007, 06:10 PM   #2
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

Any 1.8 is better than no 1.8. The NB 1.8 injectors are larger. Get what you can get cheap. I think there is a set forsale on m.net right now.
cjernigan is offline   Reply With Quote
Old 11-26-2007, 06:15 PM   #3
Elite Member
iTrader: (11)
 
Trent's Avatar
 
Join Date: Feb 2006
Location: Louisiana
Posts: 1,625
Total Cats: 5
Default

The 1.6 injectors are 230cc. The 1.8 injectors are 265cc. You are basically maxing out the 1.6's at about 6 psi.

What disc do you have in your FMU?
Trent is offline   Reply With Quote
Old 11-26-2007, 10:07 PM   #4
Junior Member
Thread Starter
iTrader: (6)
 
Join Date: Apr 2006
Posts: 259
Total Cats: 0
Default

Quote:
Originally Posted by supersaiyan93 View Post
The 1.6 injectors are 230cc. The 1.8 injectors are 265cc. You are basically maxing out the 1.6's at about 6 psi.

What disc do you have in your FMU?
Stock disc is still installed...believe the stock is 10:1 or something like that.
danscreations is offline   Reply With Quote
Old 11-26-2007, 10:22 PM   #5
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

cool so now we know you have the ability to run about 90-100 psi of FP by 10psi giving the 230's headroom for 200 or so whp.
magnamx-5 is offline   Reply With Quote
Old 11-26-2007, 11:00 PM   #6
Junior Member
Thread Starter
iTrader: (6)
 
Join Date: Apr 2006
Posts: 259
Total Cats: 0
Default

Quote:
Originally Posted by magnamx-5 View Post
cool so now we know you have the ability to run about 90-100 psi of FP by 10psi giving the 230's headroom for 200 or so whp.
so with my current setup my guess is around 145whp with an intercooler and bipes. so why would I be leaning out something wrong with my current injectors or fmu?
danscreations is offline   Reply With Quote
Old 11-27-2007, 11:53 AM   #7
Elite Member
iTrader: (2)
 
Join Date: Jun 2006
Location: ABQ, NM
Posts: 1,850
Total Cats: -8
Default

If I remember right the stock disk is 12:1
BenR is offline   Reply With Quote
Old 11-27-2007, 12:37 PM   #8
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

where are you lean up top? on midrange tip in? please elaborate as to what you are experiencing. Notice my numbers are given 10 psi of boost to raise the Fuel pressure to 100 psi given 5-6 psi you have enough fuel for 200 whp still given a 10-1 disk or a little more given a 12-1 stock greddy disk but please tell us where you are lean this could be a base Fuel pressure issue a O2 clamp issue a dirty fuel filter etc. And tell us how you know you are lean as well.
magnamx-5 is offline   Reply With Quote
Old 09-20-2011, 10:47 AM   #9
Junior Member
iTrader: (2)
 
Join Date: Jun 2011
Location: Tyler, TX
Posts: 254
Total Cats: 0
Default

I didn't feel like being a dick and starting a new thread, I plan on 9:1 forged internals, gt2860, valve springs for raised rpm, deshrouded valves, a slight polishing of the head and aim for 19 to 20 psi to stay under the diypnp bar limit. How big injectors will I need? I was thinking 600, but I'm probably wrong.
85z28 is offline   Reply With Quote
Old 09-20-2011, 11:01 AM   #10
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,174
Total Cats: 2,575
Default

If you're planning on pump gas only and sticking with that turbo then 600 should be just fine
18psi is offline   Reply With Quote
Old 09-20-2011, 11:23 AM   #11
Junior Member
iTrader: (2)
 
Join Date: Jun 2011
Location: Tyler, TX
Posts: 254
Total Cats: 0
Default

Is there a way to figure out an approximate amout of power I'll make? I just found a injector calculator. It said 600cc would be sufficient for 380 bhp. That can't be right?
85z28 is offline   Reply With Quote
Old 09-20-2011, 11:37 AM   #12
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,174
Total Cats: 2,575
Default

You calculated with stock fuel pressure?
and 380bhp = ~320whp which should be over the upper limit of that 2860...
18psi is offline   Reply With Quote
Old 09-20-2011, 12:00 PM   #13
Elite Member
iTrader: (17)
 
Join Date: Aug 2007
Location: Fort Myers, FL
Posts: 2,790
Total Cats: 128
Default

I just went from 550's to 660's for a little extra headroom, running right around the power you're shooting for. With a decent ECU to control the injectors you might as well go a little bigger than you're planning to need IMO.
pdexta is offline   Reply With Quote
Old 09-20-2011, 12:07 PM   #14
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,833
Total Cats: 1,786
Default

660 will be perfect.
Braineack is offline   Reply With Quote
Old 09-24-2011, 02:24 AM   #15
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,357
Total Cats: 1,322
Default



660s will do it, but ID1000s will idle as good or better and you will never need to upgrade.
Savington is offline   Reply With Quote
Old 09-24-2011, 06:22 AM   #16
Supporting Vendor
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,440
Total Cats: 198
Default

I highly recommend the Fuel Injector Clinic 650cc EV14. They are so good, they idle better than the stock injectors. I can provide basemaps for these. If you need to go bigger, I can also provide basmaps for the 775cc and 850cc variants as well.
Reverant is offline   Reply With Quote
Old 09-24-2011, 09:12 AM   #17
Junior Member
iTrader: (1)
 
Join Date: Oct 2008
Location: Palm Harbor FL
Posts: 332
Total Cats: 4
Default

If you going to buy injectors there's absolutely no reason to buy anything other then ID1000s IMO. With a built motor your eventually going to want more and anything smaller will not give you room to expand.
1slowna is offline   Reply With Quote
Old 09-24-2011, 09:23 AM   #18
Junior Member
iTrader: (2)
 
Join Date: Jun 2011
Location: Tyler, TX
Posts: 254
Total Cats: 0
Default

I'm going to have problems with getting those bitches to idle aren't I? Not to mention the shitty fuel atomization of injectors that large?
85z28 is offline   Reply With Quote
Old 09-25-2011, 03:00 AM   #19
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,357
Total Cats: 1,322
Default

Quote:
Originally Posted by 85z28 View Post
I'm going to have problems with getting those bitches to idle aren't I? Not to mention the shitty fuel atomization of injectors that large?
Do us all a favor and quickly forget everything you've ever learned or assumed about fuel injectors.

You can idle ID1000s at stoich. They probably have a better spray pattern than the factory injector does. The IDs are dynamically matched, so low-speed driveability and idle quality will be extremely good.

In general, all of the downsides of big injectors are no longer a concern with EV14 injectors. You can have one set of injectors that will idle stoich, pass emissions testing, exhibit perfect driveability, and then support 500+whp on stock fuel pressure.
Savington is offline   Reply With Quote
Old 09-25-2011, 01:48 PM   #20
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,833
Total Cats: 1,786
Default

not to mention impress all your friends.
Braineack 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 57 07-19-2017 05:11 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
1996 Turbo Build Goldwar DIY Turbo Discussion 2 09-29-2015 10:20 AM


Thread Tools

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 06:53 AM.