Half boost in second gear - possible solution
29 April 2004, 10:00 AM
#1
Scooby Regular
Thread Starter
Join Date: Nov 2000
Location: 32 cylinders and many cats
Posts: 18,658
Likes: 0
Received 1 Like
on
1 Post
Half boost in second gear - possible solution
Unplug or limit the speed signal to the ECU - leave it connected to the speedo.
Downsides? ECU probably uses speed in its control (eg for the rad fan) and load computations.
Downsides? ECU probably uses speed in its control (eg for the rad fan) and load computations.
29 April 2004, 10:03 AM
#2
Scooby Regular
Join Date: Nov 2001
Location: Leeds - It was 562.4bhp@28psi on Optimax, How much closer to 600 with race fuel and a bigger turbo?
Posts: 15,239
Likes: 0
Received 1 Like
on
1 Post
what are you on about john?
Thought the JECS did gear dependant boost control anyway.
Thought the JECS did gear dependant boost control anyway.
29 April 2004, 10:10 AM
#3
Scooby Regular
Thread Starter
Join Date: Nov 2000
Location: 32 cylinders and many cats
Posts: 18,658
Likes: 0
Received 1 Like
on
1 Post
That annoying noise compliance program when you hold the speed steady at about 30 mph for a few seconds and then floor it - it runs half boost - on 99/00 anyway. Frustrating when using ECU boost control.
If it doesn't know the speed it can't cut the boost
It can adjust maximum duty cycle by rate of change of engine speed giving a form of gear judge.
There is a speed sensor error code (33) but mine doesn't seem to mind the speed sensor unplugged and doesn't report an error. Maybe it would after an interval.
If it doesn't know the speed it can't cut the boost
It can adjust maximum duty cycle by rate of change of engine speed giving a form of gear judge.
There is a speed sensor error code (33) but mine doesn't seem to mind the speed sensor unplugged and doesn't report an error. Maybe it would after an interval.
29 April 2004, 12:18 PM
#4
Scooby Senior
Join Date: Oct 2000
Location: Zurich, Switzerland
Posts: 3,105
Likes: 0
Received 0 Likes
on
0 Posts
Which suggests you're using factory boost control again? I run an AVC-R to avoid this problem on track. I would like to use the spare maps to drive WI if I could get around the issue reliably (wouldn't like to lose 50% of WI suddenly ), or switch back (with 3 port, the control was pretty good).
Richard
), or switch back (with 3 port, the control was pretty good).Richard
Thread
Thread Starter
Forum
Replies
Last Post
Mattybr5@MB Developments
Full Cars Breaking For Spares
12
18 November 2015 07:03 AM