Noobish Boost issue - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MSPNP MSPNP specific Megasquirt related discussion.

Reply
 
 
 
LinkBack Thread Tools
Old 06-29-2011, 11:50 AM   #1
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Feb 2010
Location: Plainfield il
Posts: 226
Total Cats: 0
Default Noobish Boost issue

Alright writing this for the second time due to the computer restarting after window updates Well I have been tuning and tweaking on this mspnp for about a month now and feel I have gotten the hang of it. I would like to thank a handful of people on this site for that. I feel I finally have gotten to the point where I can get on it a bit more and see what my old girl can do, but there seems to be an issue with boost. When I ease into the throttle boost builds slowly but surely but if I step on it boost builds for a moment then falls on its face. I thought maybe the boost protection cut out but that is set at 200 so that can't be the issue. I have done some searching on here and other sites looking for a possible reason why this happens but still haven't found a answer yet. So I figured I would make a thread and ask for advice from the experts out there to see if they could point me and my car it the right direction for maximum boost. I also am including a current setup on my mspnp as well a most recent data log which looks like I have a recently lose ground somewhere. The reason I say that is the last data log doesn't have any noise in it. For those of you who are looking at this a little help would be great. Thanks Tony

About the setup:
91 miata stock mtr
t28 churbo with 14lbs waste gate
afm delete w gm sensor
intercooled
vtps
diy dual feed rail
460cc injectors
lc-1 wideband
Attached Files
File Type: msq mega tony fuel and tps change.msq (35.2 KB, 106 views)
File Type: zip 6282.zip (747.3 KB, 68 views)
Tony the Tiger is offline   Reply With Quote
Old 06-29-2011, 11:56 AM   #2
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,819
Total Cats: 1,780
Default

how much boost are you making before the cut? (I cant view log here)
Braineack is online now   Reply With Quote
Old 06-29-2011, 12:09 PM   #3
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Feb 2010
Location: Plainfield il
Posts: 226
Total Cats: 0
Default

10.5psi when easing into it and maybe 5 when punching prior to the fall out. Can't seem to find the fall out on the data log to give you the exact number.
Tony the Tiger is offline   Reply With Quote
Old 06-29-2011, 12:22 PM   #4
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,819
Total Cats: 1,780
Default

take a log of it and hit space bar when it happens. a short clean log of just that event.
Braineack is online now   Reply With Quote
Old 06-29-2011, 12:29 PM   #5
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Feb 2010
Location: Plainfield il
Posts: 226
Total Cats: 0
Default

Will do when i get home tonight. Quick question, under full boost what should the fuel pressure be at?
Tony the Tiger is offline   Reply With Quote
Old 06-29-2011, 12:31 PM   #6
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,819
Total Cats: 1,780
Default

~50 + whatever boost you're making.
Braineack is online now   Reply With Quote
Old 06-29-2011, 12:40 PM   #7
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Feb 2010
Location: Plainfield il
Posts: 226
Total Cats: 0
Default

Hmm on the data log at 10.5 psi I get 13 on the fuel press chart.
Tony the Tiger is offline   Reply With Quote
Old 06-29-2011, 12:42 PM   #8
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Feb 2010
Location: Plainfield il
Posts: 226
Total Cats: 0
Default

and 30+/- at normal driving
Tony the Tiger is offline   Reply With Quote
Old 06-29-2011, 12:46 PM   #9
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,819
Total Cats: 1,780
Default

MSPNP doesnt log fuel pressure.
Braineack is online now   Reply With Quote
Old 06-29-2011, 12:46 PM   #10
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Feb 2010
Location: Plainfield il
Posts: 226
Total Cats: 0
Default

Never mind just read about the computer doesn't have a input for fuel press so that reading is invalid. Will post log tonight
Tony the Tiger is offline   Reply With Quote
Old 06-29-2011, 12:47 PM   #11
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Feb 2010
Location: Plainfield il
Posts: 226
Total Cats: 0
Default

jynx! lol Thanks anyway will get back to ya later.
Tony the Tiger is offline   Reply With Quote
Old 06-29-2011, 10:59 PM   #12
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Feb 2010
Location: Plainfield il
Posts: 226
Total Cats: 0
Default

Alright this was the best I could do to show the problem but any help with the problem or something you may see that isn't looking correct give me a heads up. I'm still learning. Thanks Tony

If these pics don't work then give me a heads up and I'll find something that does.
Attached Thumbnails
Noobish Boost issue-fall-off-1.jpg   Noobish Boost issue-fall-off-2.jpg  
Attached Files
File Type: msq mega tony fuel and tps change.msq (35.2 KB, 92 views)
Tony the Tiger is offline   Reply With Quote
Old 06-30-2011, 12:53 PM   #13
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Feb 2010
Location: Plainfield il
Posts: 226
Total Cats: 0
Default

failed attempt at better pics
Tony the Tiger is offline   Reply With Quote
Old 07-01-2011, 11:35 AM   #14
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Feb 2010
Location: Plainfield il
Posts: 226
Total Cats: 0
Default

Better pic. Any help would be greatly appreciated. Thanks Tony
Attached Thumbnails
Noobish Boost issue-graph.png  
Tony the Tiger is offline   Reply With Quote
Old 07-01-2011, 11:52 AM   #15
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,819
Total Cats: 1,780
Default

dont see anyhting in that log, you let go of throttle and boost drops off.
Braineack is online now   Reply With Quote
Old 07-01-2011, 12:16 PM   #16
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Feb 2010
Location: Plainfield il
Posts: 226
Total Cats: 0
Default

hmm. something doesn't feel right but I will have to get a better shot of that. Anything else you might see that doesn't look correct or problematic.
Tony the Tiger is offline   Reply With Quote
Old 07-01-2011, 12:20 PM   #17
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,819
Total Cats: 1,780
Default

was that first gear?
Braineack is online now   Reply With Quote
Old 07-01-2011, 12:27 PM   #18
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Feb 2010
Location: Plainfield il
Posts: 226
Total Cats: 0
Default

I'm pretty sure it was 4th. why?
Tony the Tiger is offline   Reply With Quote
Old 07-01-2011, 12:27 PM   #19
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,819
Total Cats: 1,780
Default

the rpm increase looks rediculous. is your clutch slipping?
Braineack is online now   Reply With Quote
Old 07-01-2011, 12:37 PM   #20
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Feb 2010
Location: Plainfield il
Posts: 226
Total Cats: 0
Default

Well that could be completely possible since it is the stock clutch. Good thing I have a spare on standby. But shouldn't rpm follow the boost curve?
Tony the Tiger is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 57 07-19-2017 05:11 PM
LucaCarMods's Boosted Dutch Miata Build! LucaCarMods Build Threads 11 02-14-2016 07:13 AM
Going back to stock. Need some 1.6 parts. Trent WTB 2 10-01-2015 01:15 PM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 11:28 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 01:24 PM.