3800 rpm haywire - 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 04-15-2008, 10:29 PM   #1
mxv
Senior Member
Thread Starter
iTrader: (4)
 
Join Date: Oct 2005
Location: South Carolina
Posts: 582
Total Cats: 0
Default 3800 rpm haywire

Got the miata running again after being down for new everything. Got it out for its new tune and i have one of the problems i was suffering from ever since i turbo'd the car. it started up un noticeable and has gotton worse and worse. i am getting a big time sensor issue at 3800 rpm and only at this rpm. as long as i am out of boost or not getting on it hard i can go right thru the rev range fine, but when i am at 5 inches of merc or in any boost it bucks like a mother ******. after looking at the datalogs right at that rpm on my tuning pulls it shows huuuuge fluxuation in the coolant temp sensor going to straight cold to full hot wildly and same with my intake air temp sensor and now its moving into my map sensor showing some changes too. and my injector pulse width is going thru the roof too. its only at 3800 rpm under load. i am thinking something is throwing some rf but i am not sure, any ideas on this?

(shows up at the coolant temp sensor first, then the injectors, then the iat and then the map)
mxv is offline   Reply With Quote
Old 04-15-2008, 10:52 PM   #2
Junior Member
 
Join Date: Jan 2007
Posts: 188
Total Cats: 0
Default

Have you got a knock sensor connected to the CLT line?
richard_ha is offline   Reply With Quote
Old 04-15-2008, 11:05 PM   #3
mxv
Senior Member
Thread Starter
iTrader: (4)
 
Join Date: Oct 2005
Location: South Carolina
Posts: 582
Total Cats: 0
Default

no knock sensor
mxv is offline   Reply With Quote
Old 04-15-2008, 11:36 PM   #4
Senior Member
 
Join Date: Dec 2004
Location: Brisbane, Australia
Posts: 1,272
Total Cats: 32
Default

The RF is coming from the Civic.
timk is offline   Reply With Quote
Old 04-16-2008, 12:36 AM   #5
mxv
Senior Member
Thread Starter
iTrader: (4)
 
Join Date: Oct 2005
Location: South Carolina
Posts: 582
Total Cats: 0
Default

hahaha thanks sab...long time btw, IM me you ******
mxv is offline   Reply With Quote
Old 04-16-2008, 01:12 AM   #6
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Delicious and Moist.
Posts: 26,326
Total Cats: 1,926
Default

Quote:
Originally Posted by mxv View Post
i am getting a big time sensor issue at 3800 rpm and only at this rpm. as long as i am out of boost or not getting on it hard i can go right thru the rev range fine, but when i am at 5 inches of merc or in any boost it bucks like a mother ******.
See my recent thread entitled "GODDAMNMOTHERFUCKINGSHIT". It addresses exactly this problem.
Joe Perez is offline   Reply With Quote
Old 04-16-2008, 01:48 AM   #7
Elite Member
iTrader: (7)
 
samnavy's Avatar
 
Join Date: Apr 2006
Location: VIRGINIA BEACH, VA
Posts: 6,020
Total Cats: 175
Default

Put your MSQ and a datalog or two into a zip file and post it so we can see.
samnavy is offline   Reply With Quote
Old 04-16-2008, 10:17 AM   #8
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,899
Total Cats: 1,792
Default

+1, we need sometime to work with; however, $10 says it's overboost protection.
Braineack is offline   Reply With Quote
Old 04-16-2008, 09:10 PM   #9
mxv
Senior Member
Thread Starter
iTrader: (4)
 
Join Date: Oct 2005
Location: South Carolina
Posts: 582
Total Cats: 0
Default

alright, i am getting my tuner to email me some of the pulls. ill have those up either tonight or tomorrow. i can boost on it fine as long as its not at that rpm.
mxv is offline   Reply With Quote
Old 04-16-2008, 09:23 PM   #10
Junior Member
 
Join Date: Jan 2007
Posts: 188
Total Cats: 0
Default

That rpm will be when you are generating the most boost though
richard_ha is offline   Reply With Quote
Old 04-16-2008, 09:38 PM   #11
mxv
Senior Member
Thread Starter
iTrader: (4)
 
Join Date: Oct 2005
Location: South Carolina
Posts: 582
Total Cats: 0
Default

it does it even when not in boost at that rpm too though.
mxv is offline   Reply With Quote
Old 04-16-2008, 10:16 PM   #12
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,899
Total Cats: 1,792
Default

upload your msq as a zipped attachment.....then go out and take some datalogs and recreate it, then upload those. 5 minute investment for free help.
Braineack is offline   Reply With Quote
Old 04-16-2008, 10:24 PM   #13
mxv
Senior Member
Thread Starter
iTrader: (4)
 
Join Date: Oct 2005
Location: South Carolina
Posts: 582
Total Cats: 0
Default

working on it. ill have them tomorrow probably.
mxv is offline   Reply With Quote
Old 05-01-2008, 07:08 PM   #14
mxv
Senior Member
Thread Starter
iTrader: (4)
 
Join Date: Oct 2005
Location: South Carolina
Posts: 582
Total Cats: 0
Default

.... and two weeks later...




sorry they are just screen shots, i can get the full log files if you guys need.
mxv is offline   Reply With Quote
Old 05-01-2008, 07:16 PM   #15
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Delicious and Moist.
Posts: 26,326
Total Cats: 1,926
Default

Full logs, and an MSQ, would be helpful.

So would an explanation of your TPS reading. Granted, the RPM and MAP look funky as hell, but the TPS just looks downright impossible.
Joe Perez is offline   Reply With Quote
Old 05-01-2008, 09:47 PM   #16
mxv
Senior Member
Thread Starter
iTrader: (4)
 
Join Date: Oct 2005
Location: South Carolina
Posts: 582
Total Cats: 0
Default

tps wasnt plugged in. ill try to get the files up.
mxv is offline   Reply With Quote
Old 05-02-2008, 10:37 AM   #17
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,899
Total Cats: 1,792
Default

just by looking at it i bet accel enrichments are on and kicking in prematurely, but we need the log posted so we can look at it all ourselves.
Braineack is offline   Reply With Quote
Old 05-02-2008, 01:07 PM   #18
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Delicious and Moist.
Posts: 26,326
Total Cats: 1,926
Default

The flutter in the RPM signal is what bothers me. Not sure if it's the cause or a symptom, but something ain't right about that. MAP and PW can go all to hell and back without violating any laws of physics, but RPM just can't do what the log says it's doing.

The timescale is just too damn wide in that screenshot to see any detail.
Joe Perez is offline   Reply With Quote
Old 05-02-2008, 10:28 PM   #19
mxv
Senior Member
Thread Starter
iTrader: (4)
 
Join Date: Oct 2005
Location: South Carolina
Posts: 582
Total Cats: 0
Default

thanks guys, my tuner has been really busy lately so sorry for the slow updates but I WILL get those msq's files up for you guys. thanks again.
mxv is offline   Reply With Quote
Old 05-04-2008, 12:43 PM   #20
mxv
Senior Member
Thread Starter
iTrader: (4)
 
Join Date: Oct 2005
Location: South Carolina
Posts: 582
Total Cats: 0
Default

here it is...
Attached Files
File Type: rar miata.rar (286.1 KB, 40 views)
mxv 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
My solution for Oiltemp and Oilpressure input into Megasuirt (MS3) Zaphod MEGAsquirt 41 01-24-2016 01:25 PM
Low oil pressure after 1.8 swap and new turbo setup JesseTheNoob DIY Turbo Discussion 15 09-30-2015 03:44 PM
Are my coils failing? viriiguy General Miata Chat 5 09-28-2015 08:39 PM
The "other" spool question stefanst DIY Turbo Discussion 44 09-28-2015 08:16 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 04:56 PM.