Engine 850: B5234TR/2.3/20v/T5R: - Loss in boost - Page 10

AndysR · Feb 24th, 2008, 14:34

Quote:

Originally Posted by bb54

hmmmm, thats about bloody right isnt it !!!
only way to find out for sure bud is to put a known good actuator on her and if that gives no boost all i can think of is your ecu is having a melt down and getting your bcs to open the actuator too early.
we had it boosting with the mbc and boosting when i tightend the actuator arm right up, i still think its the actuator misbehaving though.
unfortunately im not familiar with an actuators internals so i cant give a theory as to why the boost sometimes returns.
possibly a diaphram split which sometimes seals itself ???

wayne

Yeah, thats a good point I am hoping that it is going to be the actuator at fault and tbh after having a think about it last night I think I want a brand new actuator on the car anyway. Will probably have a shot at renewing it myself, I have a fairly accurate boost gauge I can utilise from my other car which I can hook up temporarly from one of the spare branches from the vacuum tree to set up the correct boost level. All I hope is that the little thought in the back of my mind about the ECU being faulty is wrong!!

Can't wait to get the performance back 100 percent of the time as having restored full power today was like the car teasing me saying "look what I can do when I want to!!" lol

Jod T5 · Feb 24th, 2008, 18:08

Yes it was nice to meet you and your brother James, Andy and my old buddy Wayno...
Firstly i would re-itterate what a great 854R you have there, incredible body and paintwork and one of the cleanest engine bays i have seen..., considerably cleaner than mine or waynes in any case..lol
Well Wayne has proved, in my mind that the the issue is Wastegate actuator, rod or the sealing disc....
The car has had a full recent service, including a rotor and dizzy cap change so any "lack of maintenance" issues could be discarded...
A couple of the vac hoses looked liked they had seen better days, however replacing the recirc valve, actuator and inlet hose, hoses with 4mm fuel line failed to improve the situation...
The Mbc seemed to prove the actuator was at fault, but i was disapointed that after wayne had spent so much effort in removing the heatshield and replacing the actuator with on he has "lying around" the problem was not cured..Wayne is convinced that the actuator he replaced andy's with was knackered, but it did work well when wound in....
It does not sound like the remap has caused any issues TBH andy as the mbc worked well and despite the 850's inability to read boost levels, per say (there are ways it works out pressure).. if the ecu was cutting boost too early it would certainly have done this with the MBC in place..
I hope that the actuator is at fault, as with your contacts this should be fairly cost effective and im sure following waynes guidance you should be confident enough to try this yourself......
A Mbc is a great fault finding bit of kit....
All the best
cheers
jod

AndysR · Feb 24th, 2008, 19:45

Quote:

Originally Posted by jod t5

Yes it was nice to meet you and your brother James, Andy and my old buddy Wayno...
Firstly i would re-itterate what a great 854R you have there, incredible body and paintwork and one of the cleanest engine bays i have seen..., considerably cleaner than mine or waynes in any case..lol
Well Wayne has proved, in my mind that the the issue is Wastegate actuator, rod or the sealing disc....
The car has had a full recent service, including a rotor and dizzy cap change so any "lack of maintenance" issues could be discarded...
A couple of the vac hoses looked liked they had seen better days, however replacing the recirc valve, actuator and inlet hose, hoses with 4mm fuel line failed to improve the situation...
The Mbc seemed to prove the actuator was at fault, but i was disapointed that after wayne had spent so much effort in removing the heatshield and replacing the actuator with on he has "lying around" the problem was not cured..Wayne is convinced that the actuator he replaced andy's with was knackered, but it did work well when wound in....
It does not sound like the remap has caused any issues TBH andy as the mbc worked well and despite the 850's inability to read boost levels, per say (there are ways it works out pressure).. if the ecu was cutting boost too early it would certainly have done this with the MBC in place..
I hope that the actuator is at fault, as with your contacts this should be fairly cost effective and im sure following waynes guidance you should be confident enough to try this yourself......
A Mbc is a great fault finding bit of kit....
All the best
cheers
jod

Cheers for the kind complements Jod, will definately give replacing the actuator a shot myself

Georgey dee · Feb 24th, 2008, 19:50

Let us know how it goes.

Looks like it'll be finished in plenty of time for Marham.

Looking forward to seeing your beast (car)

George

AndysR · Feb 24th, 2008, 19:53

Quote:

Originally Posted by Georgey dee

Let us know how it goes.

Looks like it'll be finished in plenty of time for Marham.

Looking forward to seeing your beast

George

Fingers Crossed

Georgey dee · Feb 24th, 2008, 20:40

As you can see I had to edit my previous thread due to my own warped little mind

Jod T5 · Feb 24th, 2008, 21:22

Quote:

Originally Posted by Georgey dee

As you can see I had to edit my previous thread due to my own warped little mind

LOL, i can feel the forums phone lines ringing with liberals screaming that we have a pervert in our midsts....
What is the number?..lol
cheers
jod

AndysR · Feb 24th, 2008, 23:24

Quote:

Originally Posted by Georgey dee

As you can see I had to edit my previous thread due to my own warped little mind

Didn't even read it like that anyway. I would have edited my post for you as well had it not have been too late! lol

bb54 · Feb 25th, 2008, 10:01

[QUOTE=jod t5;374639]
The Mbc seemed to prove the actuator was at fault, but i was disapointed that after wayne had spent so much effort in removing the heatshield and replacing the actuator with on he has "lying around" the problem was not cured..Wayne is convinced that the actuator he replaced andy's with was knackered, but it did work well when wound in....

as you can no doubt remember, the spare actuator that had come off my doner car was wound back so far there was no thread left on the arm and when on my doner this only took the boost up to 13-14 psi when used with a bcs so it was probably very weak itself.

im pretty confident a new actuator will sort it.

wayne

Jod T5 · Feb 25th, 2008, 14:55

[QUOTE=bb54;375015]

Quote:

Originally Posted by jod t5

as you can no doubt remember, the spare actuator that had come off my doner car was wound back so far there was no thread left on the arm
wayne

Thats standard setting for one of your cars....
cheers
jod

Feb 24th, 2008, 18:08	#92
Jod T5 Phoenix from the ashes Last Online: Apr 24th, 2024 01:05 Join Date: Jan 2006 Location: Finchingfield	Yes it was nice to meet you and your brother James, Andy and my old buddy Wayno... Firstly i would re-itterate what a great 854R you have there, incredible body and paintwork and one of the cleanest engine bays i have seen..., considerably cleaner than mine or waynes in any case..lol Well Wayne has proved, in my mind that the the issue is Wastegate actuator, rod or the sealing disc.... The car has had a full recent service, including a rotor and dizzy cap change so any "lack of maintenance" issues could be discarded... A couple of the vac hoses looked liked they had seen better days, however replacing the recirc valve, actuator and inlet hose, hoses with 4mm fuel line failed to improve the situation... The Mbc seemed to prove the actuator was at fault, but i was disapointed that after wayne had spent so much effort in removing the heatshield and replacing the actuator with on he has "lying around" the problem was not cured..Wayne is convinced that the actuator he replaced andy's with was knackered, but it did work well when wound in.... It does not sound like the remap has caused any issues TBH andy as the mbc worked well and despite the 850's inability to read boost levels, per say (there are ways it works out pressure).. if the ecu was cutting boost too early it would certainly have done this with the MBC in place.. I hope that the actuator is at fault, as with your contacts this should be fairly cost effective and im sure following waynes guidance you should be confident enough to try this yourself...... A Mbc is a great fault finding bit of kit.... All the best cheers jod __________________ Dum Spiro Spero VOC 20419

Feb 24th, 2008, 19:50	#94
Georgey dee Premier Member Last Online: Feb 14th, 2024 18:36 Join Date: Dec 2005 Location: Norwich View Photos By: Georgey dee	Let us know how it goes. Looks like it'll be finished in plenty of time for Marham. Looking forward to seeing your beast (car) George __________________ HAD; 440 GLT(Loved it), 850 GLT auto(Loved it), S70 2.5T(Nothing but problems!), 850R auto(Loved it!!), S60 D5 SE (Nothing but problems!) GOT; S60 D5 SE Lux Auto RAF Marham Track Day Co-Ord' Last edited by Georgey dee; Feb 24th, 2008 at 20:40. Reason: To add the word car after beast to stop miss-understanding

Feb 24th, 2008, 20:40	#96
Georgey dee Premier Member Last Online: Feb 14th, 2024 18:36 Join Date: Dec 2005 Location: Norwich View Photos By: Georgey dee	As you can see I had to edit my previous thread due to my own warped little mind __________________ HAD; 440 GLT(Loved it), 850 GLT auto(Loved it), S70 2.5T(Nothing but problems!), 850R auto(Loved it!!), S60 D5 SE (Nothing but problems!) GOT; S60 D5 SE Lux Auto RAF Marham Track Day Co-Ord'

Feb 25th, 2008, 10:01	#99
bb54 diy bhp Last Online: Apr 7th, 2011 19:38 Join Date: Jun 2006 Location: great yarmouth	[QUOTE=jod t5;374639] The Mbc seemed to prove the actuator was at fault, but i was disapointed that after wayne had spent so much effort in removing the heatshield and replacing the actuator with on he has "lying around" the problem was not cured..Wayne is convinced that the actuator he replaced andy's with was knackered, but it did work well when wound in.... as you can no doubt remember, the spare actuator that had come off my doner car was wound back so far there was no thread left on the arm and when on my doner this only took the boost up to 13-14 psi when used with a bcs so it was probably very weak itself. im pretty confident a new actuator will sort it. wayne __________________ auto 96 T5 tweaked n ratted

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