How rich am I? - 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 04-05-2007, 08:14 PM   #1
Elite Member
Thread Starter
iTrader: (3)
 
Mach929's Avatar
 
Join Date: Oct 2004
Location: lansdale PA
Posts: 2,500
Total Cats: 0
Default How rich am I?

i was bored after work today since my lifting buddy cancelled on me so i decided to install my walbro 190hp fuel pump, everything pretty much went straight forward thanks to the writeups on this board, thanks. Now i didn't swap in my begi afpr yet and still have my vortec 12:1 and my 305cc injectors. Stupid rich in boost Some interesting things, have about 4 more psi at idle than before, starts faster, maybe my old pump was dying.

Second i decided to recheck my timing since i just got my own gun, 18 degrees! and my emanage has been adding 8 in the low revs, always ran great no pinging, nothing alarming. To be safe i just set it back down to 6 where i thought it was from the get go(tech friend did my timing about when i put the greddy on) Now either i'm very lucky or my balancer is slipping

When i get my afpr in, how much fuel pressure should i run at 10psi, 15psi?

Last edited by Mach929; 04-05-2007 at 08:41 PM.
Mach929 is offline   Reply With Quote
Old 04-05-2007, 10:19 PM   #2
Elite Member
iTrader: (14)
 
Join Date: Mar 2006
Location: Edmonton, AB
Posts: 4,921
Total Cats: 0
Default

When I read the title of this thread I figured it was another thread by Hustler with copies of a bank account statement or something.
jayc72 is offline   Reply With Quote
Old 04-06-2007, 12:16 AM   #3
Junior Member
 
Join Date: May 2005
Location: Boston, MA
Posts: 73
Total Cats: 0
Default

General rule of thumb is a 6PSI increase in fuel pressure for every 1PSI boost. so take a fuel pressure reading with the engine idling, and the vacuum hose pulled off your stock FPR. at 10PSI, add 60PSI of fuel pressure to that reading. at 15PSI, add 90PSI to that reading.

Keep in mind that anything over 100-120PSI of fuel pressure runs a risk of injector lock which is a BAD thing.
cyee is offline   Reply With Quote
Old 04-06-2007, 12:42 AM   #4
Elite Member
Thread Starter
iTrader: (3)
 
Mach929's Avatar
 
Join Date: Oct 2004
Location: lansdale PA
Posts: 2,500
Total Cats: 0
Default

yeah i figure at 15psi i probably need around 95psi to be safe, i guess i'll start there
Mach929 is offline   Reply With Quote
Old 04-06-2007, 08:37 AM   #5
AFM Crusader
iTrader: (18)
 
olderguy's Avatar
 
Join Date: Oct 2004
Location: Wayne, NJ
Posts: 4,438
Total Cats: 84
Default

If you are running the Autotune, a 4:1 disc with 305's and a 190lph HP should do it. Import your map from the main unit and send it to me via email and let me check it for you.
olderguy is offline   Reply With Quote
Old 04-06-2007, 09:51 AM   #6
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,833
Total Cats: 1,786
Default

Quote:
Originally Posted by olderguy View Post
If you are running the Autotune, a 4:1 disc with 305's and a 190lph HP should do it. Import your map from the main unit and send it to me via email and let me check it for you.

yeah, I'd go for a 4:1 ratio.
Braineack is offline   Reply With Quote
Old 04-06-2007, 02:33 PM   #7
Elite Member
Thread Starter
iTrader: (3)
 
Mach929's Avatar
 
Join Date: Oct 2004
Location: lansdale PA
Posts: 2,500
Total Cats: 0
Default

bruce i'll try to get you that map tonight

at a 4:1 ratio....15x4=60 + 50 psi of base pressure is 110psi. do you really think i need that much? i thought tom was only running around 100psi on his 1.8(265cc?) inectors
Mach929 is offline   Reply With Quote
Old 04-06-2007, 02:36 PM   #8
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,833
Total Cats: 1,786
Default

yeah you could probably go a bit less, but it will get you in the ballpark, you dont need much, and since Tom was hitting about 290BHP you could probably get away with a bit less, but you'll wanna be in that ballpark, that's where the datalog come in handy.
Braineack is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Obligation Joe Perez Current Events, News, Politics 118 11-30-2016 01:24 PM
FS/FT: 03.5 Mazdaspeed Protege leatherface24 Cars for sale/trade 15 10-16-2015 12:35 PM
VE analyze and Autotune seems funny (noob) TorqueZombie MEGAsquirt 64 09-18-2015 06:03 PM
Air Coolant Correction 86-145 iparnell MEGAsquirt 2 09-13-2015 08:04 PM
ME221 Now has Autotune and Long Term Fuel Trim Tables Motorsport-Electronics ECUs and Tuning 0 09-05-2015 09:02 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 04:42 AM.