RX7 Injectors vs RX8 Injectors? - Page 3 - 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 01-06-2011, 01:35 PM   #41
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,872
Total Cats: 1,790
Default

im unfamiliar with the rx7 FPR, but most are 1:1 and when in vacuum, there's less pressure than when at WOT (atmospheric).

The miata idles at 36psi, but at WOT it's closer to 55psi.
Braineack is offline   Reply With Quote
Old 01-06-2011, 01:57 PM   #42
Newb
Thread Starter
 
Join Date: Dec 2010
Posts: 23
Total Cats: 0
Default

I believe that's at idle, because from what I'm reading there is a vacuum hose that goes to it, so I'm guessing that may increase fuel pressure, either way I'm hearing the AFRs are pretty rich, at around the 11s, so I still may be quite safe even if I don't install an aftermarket FPR.
gryffinwings is offline   Reply With Quote
Old 01-07-2011, 08:40 AM   #43
Newb
 
Join Date: Sep 2006
Location: Germany
Posts: 26
Total Cats: 0
Default

Quote:
Originally Posted by gryffinwings View Post
Hmmmm, what's your over all opinion and experience between the RX7 460cc and the RX8 450cc injectors?

What was the fuel pressure you were using, do you have the number for that?
The RX8 Injector is a good choice with latest technology.

My fuel pressure is under VAC 36psi, atmosphere 45psi, with boost(12psi) 58psi.
I also use a begi FMU to get a lower duty cycle.

In closed loop there should be no differences, if your car is running too lean in open loop, maybe you can fixe it with more fuel pressure. But i think it should work without any modifications.
Sandro is offline   Reply With Quote
Old 01-08-2011, 01:46 AM   #44
Newb
Thread Starter
 
Join Date: Dec 2010
Posts: 23
Total Cats: 0
Default

Quote:
Originally Posted by Sandro View Post
The RX8 Injector is a good choice with latest technology.

My fuel pressure is under VAC 36psi, atmosphere 45psi, with boost(12psi) 58psi.
I also use a begi FMU to get a lower duty cycle.

In closed loop there should be no differences, if your car is running too lean in open loop, maybe you can fixe it with more fuel pressure. But i think it should work without any modifications.
Well considering how rich the NA 13B 6-port runs, I don't think running these injectors will be a problem. From what I've seen, AFRs are around in the 11s on stock tune, all the way down in the 10s at full throttle in the high RPM range.
gryffinwings is offline   Reply With Quote
Old 01-13-2011, 01:15 AM   #45
Senior Member
 
Join Date: Aug 2009
Location: MONROE CT
Posts: 1,100
Total Cats: 2
Default

Rotary engines run richer then piston engine. Why i dont know when i got my rotary tuned my idle air fuels were in the mid 12s. When im driving down the highway my air fuels never go higher then 12.8. When i hit boost the gauge goes into the 10s then at higher boost the 9s. Also what the update any good news??
miatamike203 is offline   Reply With Quote
Old 01-22-2011, 01:11 PM   #46
Newb
 
Join Date: Jan 2011
Location: NY
Posts: 18
Total Cats: 0
Default

nice swap..
mackmiata is offline   Reply With Quote
Old 01-22-2011, 04:55 PM   #47
Junior Member
 
Join Date: Jan 2009
Location: Floyds Knobs, IN
Posts: 92
Total Cats: 3
Default

Quote:
Originally Posted by miatamike203 View Post
Rotary engines run richer then piston engine. Why i dont know when i got my rotary tuned my idle air fuels were in the mid 12s. When im driving down the highway my air fuels never go higher then 12.8. When i hit boost the gauge goes into the 10s then at higher boost the 9s. Also what the update any good news??

A stock port rotary will run well under load at stoiciometric and will generally idle well at anywhere from 13.5-14.5:1. Street ported engine usually like to idle a little fatter and bridge ported engines a littler fatter still. Even so, fairly radical ports will still run well at moderate loads near stoiciometric. Under boost you will see them tuned on the rich side to ward off detonation.

All that said, your tune is most likely a whole lot fatter than it needs to be. You're wasting a bunch of fuel.
C. Ludwig 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 58 12-13-2017 10:04 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 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 04:39 AM.