Is my car knackered?
#1
Scooby Regular
Thread Starter
Join Date: Jun 2005
Location: Hampshire
Posts: 1,579
Likes: 0
Received 0 Likes
on
0 Posts
Is my car knackered?
This has happened on 2 occasions now:
I have a MY03 WRX with about 20k on the clock. When accelerating full bore from a mid to tight left hander onto a straight, the car gets to about 4k revs and lets out an almighty bang, with an instantaneous but momentary loss of power. Very much like the feeling you get when traction control kicks in on normal cars (of course the scoob doesn't have traction control).
Predictably, Subaru cannot find a fault.
Has anyone experienced the same or know what it could be, the car is in warranty so I am keen to get it sorted.
thanks
I have a MY03 WRX with about 20k on the clock. When accelerating full bore from a mid to tight left hander onto a straight, the car gets to about 4k revs and lets out an almighty bang, with an instantaneous but momentary loss of power. Very much like the feeling you get when traction control kicks in on normal cars (of course the scoob doesn't have traction control).
Predictably, Subaru cannot find a fault.
Has anyone experienced the same or know what it could be, the car is in warranty so I am keen to get it sorted.
thanks
#4
Scooby Regular
Thread Starter
Join Date: Jun 2005
Location: Hampshire
Posts: 1,579
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Rannoch
Sounds like overboost - is the air temp particularly cold when this happens?
If so - overboost triggering a fuel cut - first time it happen is a bit of a shock!
If so - overboost triggering a fuel cut - first time it happen is a bit of a shock!
I have had the car remapped, would this have contributed?
thanks
#6
Over boost is where the limit might be set at say 15psi and for some reason you hit,for arguments sake,20psi,the ecu then cuts the fuel to stop the engine doing any damage to it's self.
In a simplified form.
In a simplified form.
#7
Moderator
iTrader: (4)
Join Date: Jul 2004
Location: The Terry Crews of moderation. P P P P P P POWER!!
Posts: 18,687
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Varboy
Overboost wtf, please explain for my non-mechanic brain.
I have had the car remapped, would this have contributed?
thanks
I have had the car remapped, would this have contributed?
thanks
If you're low on fuel, and try and boot it out of a tight corner, you can get fuel surge meaning that you'll also temporarily loose power as you describe.....again, not heard of it being accompanied by a bang before though. Who mapped it. I'd have them look into it.
Ns04
Trending Topics
#8
Scooby Regular
Thread Starter
Join Date: Jun 2005
Location: Hampshire
Posts: 1,579
Likes: 0
Received 0 Likes
on
0 Posts
seems like a valid explanation, but why would it occur accelerating out of a bend and not in a straight line? Could the fact that I am cornering and hence the revs aren't rising as quickly due to centripetal forces mean that boost is rising in a different manner when compared to straight line acceleration?
#10
Scooby Regular
Join Date: Dec 2001
Location: Just far enough from sunny Liverpool
Posts: 6,963
Likes: 0
Received 0 Likes
on
0 Posts
Yep, I'd look to the map, and fuel cut due to overboost, although the circumstances under which it happens would suggest fuel starvation.
Who mapped it?
Who mapped it?
#11
Moderator
iTrader: (1)
Sound like a fuel cut - relating to too high boost pressure.
Subaru cannot find a fault it, yet you've had it remapped - how can you expect them to?
Send back to people who messed with the boost ignition and fueling...the poeple who re-mappeed it.
A Subaru garage won't have the knowledge or equipment to see if that mapping on your car is ok or not - as they'll expect it to be stock or PPP.
Subaru cannot find a fault it, yet you've had it remapped - how can you expect them to?
Send back to people who messed with the boost ignition and fueling...the poeple who re-mappeed it.
A Subaru garage won't have the knowledge or equipment to see if that mapping on your car is ok or not - as they'll expect it to be stock or PPP.
#12
Moderator
iTrader: (4)
Join Date: Jul 2004
Location: The Terry Crews of moderation. P P P P P P POWER!!
Posts: 18,687
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Varboy
seems like a valid explanation, but why would it occur accelerating out of a bend and not in a straight line? Could the fact that I am cornering and hence the revs aren't rising as quickly due to centripetal forces mean that boost is rising in a different manner when compared to straight line acceleration?
NS04
#14
Scooby Regular
iTrader: (1)
Join Date: Jan 1999
Location: UK
Posts: 15,271
Likes: 0
Received 0 Likes
on
0 Posts
And here was me thinking that as the fuel pump is located on the right side of the tank it is in fact right hand bends that cause fuel starvation not left hand ones...
...or could I be wrong?
I have certainly only experienced it the on right handers on track with hot slicks - from half a tank of fuel!!
...or could I be wrong?
I have certainly only experienced it the on right handers on track with hot slicks - from half a tank of fuel!!
#15
Moderator
iTrader: (4)
Join Date: Jul 2004
Location: The Terry Crews of moderation. P P P P P P POWER!!
Posts: 18,687
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Rannoch
And here was me thinking that as the fuel pump is located on the right side of the tank it is in fact right hand bends that cause fuel starvation not left hand ones...
...or could I be wrong?
I have certainly only experienced it the on right handers on track with hot slicks - from half a tank of fuel!!
...or could I be wrong?
I have certainly only experienced it the on right handers on track with hot slicks - from half a tank of fuel!!
NS04
#16
Originally Posted by Rannoch
And here was me thinking that as the fuel pump is located on the right side of the tank it is in fact right hand bends that cause fuel starvation not left hand ones...
...or could I be wrong?
I have certainly only experienced it the on right handers on track with hot slicks - from half a tank of fuel!!
...or could I be wrong?
I have certainly only experienced it the on right handers on track with hot slicks - from half a tank of fuel!!
#19
Scooby Regular
Join Date: Oct 2003
Location: Tellins, Home of Super Leagues finest, and where a "split" is not all it seems.
Posts: 5,504
Likes: 0
Received 0 Likes
on
0 Posts
Aye, an overboost issue there me thinks. Had the same problem on my MY99 was hitting 1.4bar at 4k and doing exactly the same...
Yours may be asa result of the remap, mine was due to the car having a bleed valve that I didnt know to look for when I bought it and it was wound too much...
My subaru dealer tried to replace a "Wastegate Solenoid" at a £200 cost which naturally did nothing, so after some squabbling and a full refund I found a scoobynet member who sorted it for me (thank god and 'im)...
P
Yours may be asa result of the remap, mine was due to the car having a bleed valve that I didnt know to look for when I bought it and it was wound too much...
My subaru dealer tried to replace a "Wastegate Solenoid" at a £200 cost which naturally did nothing, so after some squabbling and a full refund I found a scoobynet member who sorted it for me (thank god and 'im)...
P
#20
Moderator
iTrader: (4)
Join Date: Jul 2004
Location: The Terry Crews of moderation. P P P P P P POWER!!
Posts: 18,687
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Abdabz
Aye, an overboost issue there me thinks. Had the same problem on my MY99 was hitting 1.4bar at 4k and doing exactly the same...
Yours may be asa result of the remap, mine was due to the car having a bleed valve that I didnt know to look for when I bought it and it was wound too much...
My subaru dealer tried to replace a "Wastegate Solenoid" at a £200 cost which naturally did nothing, so after some squabbling and a full refund I found a scoobynet member who sorted it for me (thank god and 'im)...
P
Yours may be asa result of the remap, mine was due to the car having a bleed valve that I didnt know to look for when I bought it and it was wound too much...
My subaru dealer tried to replace a "Wastegate Solenoid" at a £200 cost which naturally did nothing, so after some squabbling and a full refund I found a scoobynet member who sorted it for me (thank god and 'im)...
P
NS04
#21
Scooby Regular
Thread Starter
Join Date: Jun 2005
Location: Hampshire
Posts: 1,579
Likes: 0
Received 0 Likes
on
0 Posts
It was an Ecutek II map which by all accounts is a 'one size fits all' map pretty much like a Prodrive chip, it wasn't a tailored map.
I wont reveal the company who did the map as they are a well respected member of this board.
And for you people 'blah blah how can you expect Subaru to pick it up blah blah' they did a road test on didn't do a diagnostic, they were looking for a mechanical failure due to the symptoms I reported. And if you don't tell them about the map, it ain't there! so my warranty is fine thanks very much
Will keep the tank with lots of fuel in it from now, though thanks
I wont reveal the company who did the map as they are a well respected member of this board.
And for you people 'blah blah how can you expect Subaru to pick it up blah blah' they did a road test on didn't do a diagnostic, they were looking for a mechanical failure due to the symptoms I reported. And if you don't tell them about the map, it ain't there! so my warranty is fine thanks very much
Will keep the tank with lots of fuel in it from now, though thanks
Thread
Thread Starter
Forum
Replies
Last Post
ossett2k2
Engine Management and ECU Remapping
15
23 September 2015 09:11 AM