www.gt4dc.co.uk
Maintain, Modify and DRIVE your GT-Four


It is currently Fri Mar 29, 2024 12:29 am




Post new topic Reply to topic  [ 18 posts ]  Go to page 1, 2  Next
Author Message
PostPosted: Thu Jun 28, 2012 5:46 pm 
Offline
Group B
User avatar

Joined: Sat Sep 02, 2006 3:13 pm
Posts: 3679
Location: Bournemouth
Car Model: None
Have just put my Link G3 back in the 205 so I can run the dual map facility to get the LPG running better.

Now looking for a suitable map as a starting point. I was never happy with the map I had on it before, which was taken from a profesionally mapped G3. It seemed to go to full advance by about 2500RPM and then flat all the way up. I would have expected something which increased more steadily with RPM.

I have come across the standard maps for a 185 which are much more the shape I would expect, but I'm not sure if the 'load' axis is a direct readout from the AFM, in which case it will increase with RPM in it's own right which means there is no easy translation to a map based ECU.

Anyway, if you are able to download & post ignition maps for standardish 205's it would be a great help.

http://gt4.mwp.id.au/

Image

Image

My old ignition map:

Image

_________________
If at first you don't suck seed, try drier grain.

Image


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jun 28, 2012 5:55 pm 
Offline
Group B
User avatar

Joined: Sat Sep 02, 2006 3:13 pm
Posts: 3679
Location: Bournemouth
Car Model: None
Another even stranger map which was apparently from an early gen MR2 turbo.

Image

_________________
If at first you don't suck seed, try drier grain.

Image


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jun 28, 2012 9:05 pm 
Offline
Club Staff
User avatar

Joined: Wed Jul 13, 2005 6:54 pm
Posts: 3484
Location: On Top
Car Model: None
I have some somewhere CDB. The Apexi Power FC base map for ST205 may be of interest (It however requires the timing knocking back a touch.)

The 185 map above I understand is from the AFM output as you rightly point out so pretty pointless IMHO as you also can't work out what an airflow reading means. It could be high boost low rpm or low boost high rpm for a given airflow!

I expect to see timing at high boost start to clime as RPM rises but with a dip where max torque occurs then rising again as RPM increases.

_________________
JP
GT4DC Treasurer

Grey St185 RC
Silver BMW E46 M3
Multicolour yawn Honda VFR400
Silver Honda Civic Type-R


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jun 28, 2012 9:11 pm 
Offline
Club Staff
User avatar

Joined: Thu Jul 14, 2005 12:44 pm
Posts: 4067
Location: drinking devil fuel
Car Model: ST205
Does Daryl still have the ecu code?


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jun 28, 2012 9:23 pm 
Offline
Group B
User avatar

Joined: Sat Sep 02, 2006 3:13 pm
Posts: 3679
Location: Bournemouth
Car Model: None
That would be extremely useful please JP.

Daryl has the ECU code. I have a copy of the 205 code but it's uncommented and I don't have time at the moment to go through it all.

_________________
If at first you don't suck seed, try drier grain.

Image


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jun 28, 2012 9:42 pm 
Offline
Club Staff
User avatar

Joined: Wed Jul 13, 2005 6:54 pm
Posts: 3484
Location: On Top
Car Model: None
RPM across the top and pressure in Y-Axis. 10000 = 1 atmosphere

Image
I am sure Steve will have some comments about what is wrong with this :-)

To be honest it actually ran the car pretty well but it needed timing removed at high boost (knocked like buggery above 0.8 bar) and I had started mapping it before I realised my chargecooler pump had seized so I ended up chasing my tail for a while on the base map :-(

_________________
JP
GT4DC Treasurer

Grey St185 RC
Silver BMW E46 M3
Multicolour yawn Honda VFR400
Silver Honda Civic Type-R


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jun 28, 2012 10:19 pm 
Offline
Group B
User avatar

Joined: Sat Sep 02, 2006 3:13 pm
Posts: 3679
Location: Bournemouth
Car Model: None
Does that have 10 degrees base added on to all the figures, or is that absolute ?

_________________
If at first you don't suck seed, try drier grain.

Image


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jun 28, 2012 10:22 pm 
Offline
Club Staff
User avatar

Joined: Wed Jul 13, 2005 6:54 pm
Posts: 3484
Location: On Top
Car Model: None
I assume the way it works is that you set the dizzy at 10 deg BTDC and the above map is a correction from that - i.e. 10 degs on the above map = 20 degs.

There is nothing in the software to correct for a BTDC setting.

_________________
JP
GT4DC Treasurer

Grey St185 RC
Silver BMW E46 M3
Multicolour yawn Honda VFR400
Silver Honda Civic Type-R


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jun 28, 2012 10:37 pm 
Offline
Clubman

Joined: Sat Aug 25, 2007 9:14 am
Posts: 142
Location: France
Car Model: None
It's absolute value based on 10° dizzy set

I will look after my maps if that help too


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jun 28, 2012 11:17 pm 
Offline
Group B
User avatar

Joined: Sat Sep 02, 2006 3:13 pm
Posts: 3679
Location: Bournemouth
Car Model: None
The more the merrier. I have seen several maps, quite different especially in the 'cruising' areas of the map. This is the area I want to especially get right for best economy.

It would also be helpful if anyone has any knowledge of LPG and whether it should be more advanced in cruising areas or if you can just get away with not needing to retard to avoid knock.

_________________
If at first you don't suck seed, try drier grain.

Image


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jun 28, 2012 11:34 pm 
Offline
Club Staff
User avatar

Joined: Thu Jul 14, 2005 12:44 pm
Posts: 4067
Location: drinking devil fuel
Car Model: ST205
I thought log required more advance due to lower flame propagation speed but I can't say I've ever looked into it

Trying to find my old maps now but can't remember where my datalogit software is :oops:
I had a nicely calibrated fuel map but never got timing as I wanted due to possibly false knock from little end damage


Top
 Profile  
 
 Post subject:
PostPosted: Fri Jun 29, 2012 11:45 am 
Offline
New Poster

Joined: Wed May 27, 2009 5:02 pm
Posts: 40
Car Model: None
isnt there some sort off startup map in pclink..
just checked: st205_base map.pcl is there..


Top
 Profile  
 
 Post subject:
PostPosted: Fri Jun 29, 2012 11:55 am 
Offline
Group B
User avatar

Joined: Sat Sep 02, 2006 3:13 pm
Posts: 3679
Location: Bournemouth
Car Model: None
Quote:
I thought log required more advance due to lower flame propagation speed but I can't say I've ever looked into it


I'm guessing logs have a much slower flame propogation but I'm not mapping a woodburner :lol: (sorry, couldn't resist)

I notice the graphical representation of the standard map shows pressure on the Y axis so I'm thinking that ignition is mapped against the turbo pressure sensor and only fuel is mapped to the AFM. Would make sense, from experience with Lewis's car where the previous owner had unplumbed the sensor to avoid fuel cut and the car detted like mad on boost. Replumbed the sensor with a limit just below fuel cut and the det. was gone.

I tried the 'standard' map, making an educated guess on y axis scaling from the graphical one plus what was in mine already. The main difference was a fairly large reduction of advance in the 'cruising' area (2K - 3.5K, lightish throttle) and an increase of a few degrees in the higher RPM, on boost area. Car didn't feel any different in the cruising bit, but the mixture is now showing much richer on the wideband so I can reduce the fueling. I'm hoping this will increase ecconomy as the first tankful of LPG is showing about 15% reduction in ecconomy from standard ECU. (did include some very rich initial mapping). The engine is also revving cleaner for the extra advance at the top.

_________________
If at first you don't suck seed, try drier grain.

Image


Top
 Profile  
 
 Post subject:
PostPosted: Fri Jun 29, 2012 11:57 am 
Offline
Group B
User avatar

Joined: Sat Sep 02, 2006 3:13 pm
Posts: 3679
Location: Bournemouth
Car Model: None
rio wrote:
isnt there some sort off startup map in pclink..
just checked: st205_base map.pcl is there..


Thanks, I'll have a look at the newer version. I was one of the first few to put a link in a GT4 so was working from a blank sheet initially.

_________________
If at first you don't suck seed, try drier grain.

Image


Top
 Profile  
 
 Post subject:
PostPosted: Fri Jun 29, 2012 12:49 pm 
Offline
Group B
User avatar

Joined: Sat Sep 02, 2006 3:13 pm
Posts: 3679
Location: Bournemouth
Car Model: None
Link G3 doesn't have a 3s base map but G4 does:

Seems very conservative timing unless they're adding a constant somewhere, but again seems to have more the shape of the 'standard' map.

Image

_________________
If at first you don't suck seed, try drier grain.

Image


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 18 posts ]  Go to page 1, 2  Next


Who is online

Users browsing this forum: No registered users and 13 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

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group