Voltage drop while under load and idle? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 03-24-2016, 01:45 AM   #1
Newb
Thread Starter
 
Join Date: Apr 2015
Posts: 22
Total Cats: 1
Default Voltage drop while under load and idle?

Yesterday I had installed the Megasquirt PNP PRO for my 04 Mazdaspeed Miata. Only 2 settings have been changed, Overboost Protection at 177 kPa(~11psi) with both Fuel and Spark cut and Rev limit to 7000 instead of 7200.

I notice for night time driving there is a significant notice drop in voltage when on the throttle or idling. Two things to verify it were all lights dimming and also my Cigarette lighter splitter has a voltage sense and it shows 4 lights. 2 red(Under 12v and 12v), yellow(mid/normal) and then green (high).

Before the megasquirt installation, the stock ecu handled the voltage just fine and all 4 lights illuminated with no noticeable drain spike besides when A/C kicked on for a split second.

Youtube vid here of difference
Shinjitago is offline   Reply With Quote
Old 03-24-2016, 09:08 AM   #2
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,809
Total Cats: 1,780
Default

what does your battery voltage look like when you datalog?
Braineack is offline   Reply With Quote
Old 03-24-2016, 10:45 AM   #3
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,037
Total Cats: 406
Default

is MS controlling your alternator? Could just need a more aggressive duty curve.
y8s is offline   Reply With Quote
Old 03-24-2016, 11:11 PM   #4
Newb
Thread Starter
 
Join Date: Apr 2015
Posts: 22
Total Cats: 1
Default

Well I ended up not looking at the logs, but the basemap gave 13.5 "run" mode volts while Alt charge sat at 14.0. I turned up the "run" volts to 14.0 and charge volts at 14.3, overrun I kept the same. That ended up solving the issue in the end.
Shinjitago is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
ACT Clutch kit, ACT Prolite, ATI Damper, Built Motor/head, stock parts Alpod Miata parts for sale/trade 12 04-08-2016 06:11 PM
Springs, NB Throttle body, NA 1.8 Test Pipe skipstr Miata parts for sale/trade 2 03-31-2016 11:35 PM
Can I run ID 1000s on E85 with stock ECU? patsmx5 ECUs and Tuning 16 03-22-2016 03:28 PM
1997 too lean at full throttle Greasyman Engine Performance 8 03-22-2016 10:08 AM
signal lights not working at night skiwiz General Miata Chat 2 03-20-2016 02:05 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 Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 12:25 AM.