stumbling and choking after 5,000 rpm? - Page 6 - Miata Turbo Forum -Boost cars, acquire cats.

Welcome to   Members

Prefabbed Turbo Kits A place to discuss prefabricated turbo kits on the market TrackSpeed

LinkBack Thread Tools
Old 01-20-2007, 01:03 PM   #101
Elite Member
iTrader: (14)
Join Date: Mar 2006
Location: Edmonton, AB
Posts: 4,922
Total Cats: 0

The little black box was causing the over fueling.
jayc72 is offline   Reply With Quote
Old 01-22-2007, 05:52 AM   #102
Senior Member
Thread Starter
iTrader: (1)
Join Date: Sep 2006
Location: Hong Kong
Posts: 523
Total Cats: 0

I dunno what the BLACK BOX is doing to the fuel... but once out.. everything is fine!

Running now with an 1.7:1 AFPR... working very well with the 1.8 injectors for fuel.. but can't really tell once its on the dyno and cheak the A/F.
Mimime is offline   Reply With Quote
Old 01-22-2007, 08:58 AM   #103
Senior Member
Join Date: Dec 2004
Posts: 1,450
Total Cats: -1

As I recall, the black box was pretty heavy-handed...I think it just fooled the ECU into thinking it was running cooler (like a 160° thermostat would) at all times which makes the car richer. It was pretty basic.

If you're only running a 1.7:1 AFPR now, and not the 12:1 Vortec, then you're running too lean at this point
bripab007 is offline   Reply With Quote
Old 01-23-2007, 02:03 PM   #104
Pave the Planet
iTrader: (3)
Join Date: Apr 2006
Location: Northern Michigan
Posts: 891
Total Cats: 0

I think his 1.7:1 AFPR is a rising rate, meaning that the ratio increases as boost increases. So its like your raising the rate that the fuel ratio raises at!? Seems repetative.
rotaryjunky is offline   Reply With Quote
Old 01-23-2007, 02:14 PM   #105
Boost Czar

iTrader: (60)
Braineack's Avatar
Join Date: May 2005
Location: Chantilly, VA
Posts: 69,653
Total Cats: 1,356

yeah, 1.7psi of fuel for 1psi of boost. = ( 1.7 x 5 ) + 50 = 58.5psi of fuel.

265cc injectors at 58.5psi of fuel can fuel 140rwhp, I'd say that's cutting it close.

are you trying to say 1.7:1, 3.4:2, 5.1:3, etc.?
Braineack is offline   Reply With Quote
Old 01-23-2007, 02:20 PM   #106
Supporting Vendor

iTrader: (33)
Ben's Avatar
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,662
Total Cats: 71

Definately lean.
Ben is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
My solution for Oiltemp and Oilpressure input into Megasuirt (MS3) Zaphod MEGAsquirt 41 01-24-2016 12:25 PM
Low oil pressure after 1.8 swap and new turbo setup JesseTheNoob DIY Turbo Discussion 15 09-30-2015 02:44 PM
Are my coils failing? viriiguy General Miata Chat 5 09-28-2015 07:39 PM
The "other" spool question stefanst DIY Turbo Discussion 44 09-28-2015 07:16 PM
6ULs for Sale in Green Bay JStoops Miata parts for sale/trade 0 09-28-2015 05:35 PM

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 On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 11:19 PM.