Notices
MEGAsquirt A place to collectively sort out this megasquirt gizmo

Cutting out at 5k in boost

Thread Tools
 
Search this Thread
 
Old Feb 19, 2020 | 09:23 PM
  #1  
cleanmx5's Avatar
Thread Starter
Newb
 
Joined: Feb 2020
Posts: 3
Total Cats: 0
Default Cutting out at 5k in boost

Just finished putting the MKTurbo kit on my car. Im having an issue where I get to 5k~ rpm at wot and it cuts out. wot is fine in 1st gear but any other gear it struggles. Don't think its a fueling issue I have 640cc injectors. Any recommendations would be appreciated.
Also here is a link to the datalog https://easyupload.io/g3fzvm (file was too big to upload here)
Old Feb 20, 2020 | 09:08 AM
  #2  
MetalMuffins's Avatar
Junior Member
iTrader: (1)
 
Joined: Feb 2016
Posts: 251
Total Cats: 34
From: Halifax, NS
Default

I don't have access to check the datalog right now, but I would check and see where your boost cut is set, sounds like that might be causing said issue.
Old Feb 20, 2020 | 09:21 AM
  #3  
shuiend's Avatar
mkturbo.com
iTrader: (24)
 
Joined: May 2006
Posts: 15,235
Total Cats: 1,700
From: Charleston SC
Default

First, wire open the wastegate, then do a WOT pull. Take a log and see what you max KPA is. Make sure it is not more then 105-110 or so. If it is more then you are creeping and need to port a bit more.

I am guessing you are possibly creeping a bit and hitting the boost cut. I won't have time to look at the log until late this weekend.
Old Feb 20, 2020 | 10:02 AM
  #4  
cleanmx5's Avatar
Thread Starter
Newb
 
Joined: Feb 2020
Posts: 3
Total Cats: 0
Default

Originally Posted by MetalMuffins
I don't have access to check the datalog right now, but I would check and see where your boost cut is set, sounds like that might be causing said issue.
Originally Posted by shuiend
First, wire open the wastegate, then do a WOT pull. Take a log and see what you max KPA is. Make sure it is not more then 105-110 or so. If it is more then you are creeping and need to port a bit more.

I am guessing you are possibly creeping a bit and hitting the boost cut. I won't have time to look at the log until late this weekend.
this is happening with the wastegate wired open. Im making around 140KPA so clearly i still need to port it more, but my overboost protection is set to 170KPA so its not that causing the issue.
Old Feb 20, 2020 | 10:41 AM
  #5  
HmoobDude's Avatar
Junior Member
 
Joined: Jul 2018
Posts: 118
Total Cats: 5
From: Colorado
Default

Originally Posted by cleanmx5
this is happening with the wastegate wired open. Im making around 140KPA so clearly i still need to port it more, but my overboost protection is set to 170KPA so its not that causing the issue.
I believe that isn't necessarily true and is probably a combination of the two. Someone correct me if I'm wrong, but I thought I had read and understood that even if you don't hit your set overboost protection KPA, if the Megasquirt "predicts" that you will (eventually) hit it based off of the RPM and KPA curve/graph then it will still kick in.
Old Feb 20, 2020 | 12:07 PM
  #6  
shuiend's Avatar
mkturbo.com
iTrader: (24)
 
Joined: May 2006
Posts: 15,235
Total Cats: 1,700
From: Charleston SC
Default

Originally Posted by HmoobDude
I believe that isn't necessarily true and is probably a combination of the two. Someone correct me if I'm wrong, but I thought I had read and understood that even if you don't hit your set overboost protection KPA, if the Megasquirt "predicts" that you will (eventually) hit it based off of the RPM and KPA curve/graph then it will still kick in.
Correct, but it should not do that unless you are within like 5kpa or something. Not 30kpa below it.
Old Feb 20, 2020 | 01:14 PM
  #7  
gooflophaze's Avatar
Senior Member
 
Joined: May 2007
Posts: 997
Total Cats: 156
From: Atlanta
Default

I don't see any sync losses in the log, but you've got some increasing timing errors as you approach 5k (+/- 12.5) (yellow line)
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
joejoepop
ECUs and Tuning
29
Apr 18, 2016 09:55 PM
dweezle
MEGAsquirt
35
Nov 16, 2014 08:18 AM
AnnorexicRoadster
DIY Turbo Discussion
2
May 16, 2011 05:41 PM
nicacus
General Miata Chat
14
Oct 26, 2007 08:35 AM
reddroptop
General Miata Chat
4
Aug 18, 2007 10:45 AM




All times are GMT -4. The time now is 09:22 PM.