It is currently Wed Jun 26, 2019 1:08 am



Post new topic Reply to topic  [ 7 posts ] 
Author Message
 Post subject: 3.5 Bar MAP sensor vs 1 Bar sensor
PostPosted: Tue Jan 10, 2012 10:58 am 
Offline

Joined: Wed Mar 17, 2010 9:24 am
Posts: 329
ECU Model: S80 Pro
Firmware Version: 62
I've gone back to a normally aspirated engine with a map sensor. I'm using the same Kavlico 3.5 bar MAP sensor that was on my turbo engine and it seems to work fine with DTA's standard pressure compensation map applied.

I say runs OK, but I have a niggling doubt it could be better with a 1 bar sensor.
I know you would get more resolution in the sensor scaling page, but does that really matter? I'm not so familiar with mapping n'asp engines.

Just trying to keep costs down :)


Top
 Profile  
 
 Post subject: Re: 3.5 Bar MAP sensor vs 1 Bar sensor
PostPosted: Tue Jan 10, 2012 2:04 pm 
Offline

Joined: Tue Aug 02, 2011 12:08 pm
Posts: 2983
Location: Norn Iron
ECU Model: No ECU
I doubt it will make any difference you'll notice.

Maybe if something seemed odd, check for stable voltages from the sensor. Worst case it may fluctuate a bit more.
But as they work perfectly fine on a boosted engine, they'll work perfectly fine on a n/a

Is it a temp change or permanent ?


Top
 Profile  
 
 Post subject: Re: 3.5 Bar MAP sensor vs 1 Bar sensor
PostPosted: Wed Jan 11, 2012 4:54 am 
Offline

Joined: Wed Mar 17, 2010 9:24 am
Posts: 329
ECU Model: S80 Pro
Firmware Version: 62
Yeah permanent. I've gone back to n'asp tuning. High hp turbo motoring just crippled me at the pumps every month :?

The KPA reading does fluctuate a little at idle actually, but not a huge amount.

It's odd readings I'm getting that make me wonder. Such as 6KPA at over-run, 20KPA at very light throttle on motorway and mid 30s KPA for idle. I'm used to seeing much higher numbers than that (off boost).

This motor is DBW though and when the plate is closed, it's REALLY closed. Which may explain the high vaccum I guess.

I might try a 1 bar anyway tbh as it's makes more sense for n'asp really.....


Top
 Profile  
 
 Post subject: Re: 3.5 Bar MAP sensor vs 1 Bar sensor
PostPosted: Wed Jan 11, 2012 6:59 am 
Offline

Joined: Tue Aug 02, 2011 12:08 pm
Posts: 2983
Location: Norn Iron
ECU Model: No ECU
readings dont sound that odd really. Id expect a mild cammed engine to pull 30-40kpa at idle.

Why not just get a mityvac or similar and test the map sensor readings ?

Where is the signal line taken from ? It always needs to be from a central plenum or intake pulses can affect the stability of readings. Damping the line can also be needed sometimes. Filtering may achieve a similar result, although Ive never used much filtering.


Top
 Profile  
 
 Post subject: Re: 3.5 Bar MAP sensor vs 1 Bar sensor
PostPosted: Wed Jan 11, 2012 5:06 pm 
Offline

Joined: Wed Mar 17, 2010 9:24 am
Posts: 329
ECU Model: S80 Pro
Firmware Version: 62
Good idea on the Mityvac, I'll look into that.

Here is the MAP sensor and it's manifold connection. It's right at the back of the plenum well away from the runners, so I figured that would give a stable enough feed.

Image


Top
 Profile  
 
 Post subject: Re: 3.5 Bar MAP sensor vs 1 Bar sensor
PostPosted: Wed Jan 11, 2012 5:26 pm 
Offline

Joined: Tue Aug 02, 2011 12:08 pm
Posts: 2983
Location: Norn Iron
ECU Model: No ECU
Looks like a decent enough position


Top
 Profile  
 
 Post subject: Re: 3.5 Bar MAP sensor vs 1 Bar sensor
PostPosted: Fri Jan 13, 2012 4:16 am 
Offline

Joined: Wed Mar 17, 2010 9:24 am
Posts: 329
ECU Model: S80 Pro
Firmware Version: 62
Cheers Stevie. Got the Mityvac this morning. Nice bit of kit 8-)


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 7 posts ] 

Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Theme designed by stylerbb.net © 2008
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
All times are UTC - 5 hours