1.6 problem. - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 01-29-2012, 08:57 PM   #1
Newb
Thread Starter
 
Join Date: Nov 2006
Location: Bossier City, LA
Posts: 29
Total Cats: 0
Default 1.6 problem.

1990 1.6 .I have a t28 setup, intercooled. With lc-1, walbro 255, bipes, begi fpr, stock injector and ecu. The turbo is boosting 7psi.

The issue im having is at wot at around 4k rpm my car feels as if its cutting out and lacking all power. My afr will go from 13.6 to 16ish once the cut out occurs. A better understanding would be a "fuel cut" situation.

Some guidence would be appreciated.
Miazda318 is offline   Reply With Quote
Old 01-29-2012, 11:21 PM   #2
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,109
Total Cats: 518
Default

When is the last time you replaced your spark plug wires?
curly is offline   Reply With Quote
Old 01-29-2012, 11:46 PM   #3
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Delicious and Moist.
Posts: 26,327
Total Cats: 1,926
Default

Seems like all of the 1.6 cars with stock ECUs do this.
Joe Perez is offline   Reply With Quote
Old 01-30-2012, 01:00 AM   #4
Newb
Thread Starter
 
Join Date: Nov 2006
Location: Bossier City, LA
Posts: 29
Total Cats: 0
Default

I disconnected the bipes and solved the problem for the most part. But leans out still. It will pull fine at 13ish afr. Then at times will jump from 13ish afr to 16 and do the "cut".

I will change wires and plugs tomorrow.

Any idea what caused this with stock ecu? ...Afm?
Miazda318 is offline   Reply With Quote
Old 01-31-2012, 10:38 AM   #5
I'm Miserable!
 
Join Date: Jun 2009
Location: albany, ga
Posts: 1,869
Total Cats: 3
Default

disconnect the 02 sensor and see what happens in open loop
Techsalvager is offline   Reply With Quote
Old 01-31-2012, 10:40 AM   #6
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,899
Total Cats: 1,792
Default

AFR should be going from 15:1 to 10:1 at around 4K with your setup.

Sounds like your FMU isn't doing crap.
Braineack is offline   Reply With Quote
Old 01-31-2012, 05:32 PM   #7
Newb
Thread Starter
 
Join Date: Nov 2006
Location: Bossier City, LA
Posts: 29
Total Cats: 0
Default

i put some "fresh" gas in it today (was at quarter tank) put 3 gallons of 93. runs great and pulls...at 5k...

but i have adjusted the fpr some. at half throttle the afr's are reading 13.4ish, at full throttle at 7psi its reading 15.6ish. and idles at 14.9.

so i assume i will just need to keep tweaking the needle valve?

and if i dont hear "knock", should i assume there is no detonation occuring?
Miazda318 is offline   Reply With Quote
Old 01-31-2012, 05:38 PM   #8
I'm Miserable!
 
Join Date: Jun 2009
Location: albany, ga
Posts: 1,869
Total Cats: 3
Default

Quote:
Originally Posted by Miazda318 View Post
and if i dont hear "knock", should i assume there is no detonation occuring?
NO
just because you can't hear it doesn't mean its not there.
and if you start boosting and afrs keep going up and up and never come down below 12.5 you should let out
Techsalvager is offline   Reply With Quote
Old 01-31-2012, 08:48 PM   #9
Newb
Thread Starter
 
Join Date: Nov 2006
Location: Bossier City, LA
Posts: 29
Total Cats: 0
Default

I messed with the fpr and bipes some. In some pulls it'll get to 11.8-12.6 and some pulls it'll read 13.8-14.6

I have the needle valve bottomed out. I am unable to monitor fuel pressure while driving. It feels nice at the 13 afr range.
Miazda318 is offline   Reply With Quote
Old 01-31-2012, 09:12 PM   #10
I'm Miserable!
 
Join Date: Jun 2009
Location: albany, ga
Posts: 1,869
Total Cats: 3
Default

yeah unitl it blows up.
Techsalvager is offline   Reply With Quote
Old 01-31-2012, 10:31 PM   #11
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,109
Total Cats: 518
Default

You'll want to run mid to high 11s, and we'll allow low 12s in lower RPMs. This should be your main focus, not how strong it feels.
curly is offline   Reply With Quote
Old 02-01-2012, 12:07 AM   #12
Newb
Thread Starter
 
Join Date: Nov 2006
Location: Bossier City, LA
Posts: 29
Total Cats: 0
Default

I have some 01 265's. I may try. The fpr isn't allowing me to reach 11's and such. Which is interesting, since I've seen people on 7psi reach those afr's with a afpr
Miazda318 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Need help - Stock Balancer and Fastforward overlay pulleys Frank_and_Beans Supercharger Discussion 13 09-12-2016 09:17 PM
Going back to stock. Need some 1.6 parts. Trent WTB 2 10-01-2015 01:15 PM
Charlotte - 1.6 ECU/Injectors, '94 R Pacakage Stuff Dustin Miata parts for sale/trade 4 09-23-2015 11:34 PM
Microsoft Edge browser & MT.NET bahurd Front Desk 0 09-21-2015 09:45 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 02:34 AM.