S70 T5 Overboost

[960kg]

Originally Posted by Jod T5

Of course, the arguments on this thread are counteracted by the fact that the pre ME7 (turbo) ECM's (MY1999) do not have boost pressures reported back to them....

The older units do report issues such as throttle position and MAF sensor results etc... that give fuel cut (not electrical ignition note)....

I would give Andrew's opinion a little more credit than it appears it is being allowed....

Jod

I don`t understand why you say Andrew`s opinion is not being allowed it is more my opinion that is not being allowed as i am new over here and others don`t like intervention and it appears your another.

Why don`t you all live and let live, this is a a forum for opinions to help others in trouble and not to say to the OP "do it my way"

Ok, then Jod T5 here is a good question for yourself!!

If the ECM on earlier models do not get reported any boost measurements and the boost is controlled by throttle position and MAF results, then why after my remap or another ECM being put in my car has the boost psi gone up to 16psi where before it was 10psi. The throttle position is identical, WOT, so no change to report there and the same unchanged MAF must be registering 60% more air going in the engine???

Boost is mechanical and not electrical and has to be controlled by an electrical component to be safe for the engine. That component is the TCV(BCS) which has a wired connector going to the ECM.

The boost limit registered in the ECM has been removed because if the TCV is not connect it will boost to the capability of the turbo.

That is why in simple terms one of my friends has just blown a head gasket on his highly modified T4 , one of the hoses split from the turbo compressor via the TCV and the boost went to 30psi before he could take action about it. He still has the same MAF same throttle position and also the standard not yet remapped ECM so why did he overboost then? simply because the boost could not be controlled by the TCV.

With no splits in the hoses and the TCV, boost was controlled.

All early V70 T5`s and the 850`s all have a TCV although a different shape to the later. They are used to control boost that is why they are there otherwise there would be no need for them if boost was controlled by the throttle and MAF.

[Jack Spaniel]

I feel like the village idiot at a MENSA gathering......

[Jod T5]

Originally Posted by 960kg

I don`t understand why you say Andrew`s opinion is not being allowed it is more my opinion that is not being allowed as i am new over here and others don`t like intervention and it appears your another.

So if someone does not agree with your opinion you accuse them of ganging up on you in some playground bullying styli.....

Andrew posted a comment based on real life experience, not some conjecture surrounding maybe' and has been'....Yes Andrew has been on the forum for quite some time and his posts and feedback is very good...

No one is "not being allowed".. I have made no comment as to your input, all i suggested was that as the ECM cannot read boost pressures..The participants in the thread appear to be convincing themselves there is a induction leak, where as this is not necessarily true as the actions of the car are a characteristic of a auto...

The rest of it is off thread and quite frankly evidence that you understand very little about 4.3 and 4.4 motronic systems

Jod

[960kg]

Originally Posted by Jod T5

So if someone does not agree with your opinion you accuse them of ganging up on you in some playground bullying styli.....

Andrew posted a comment based on real life experience, not some conjecture surrounding maybe' and has been'....Yes Andrew has been on the forum for quite some time and his posts and feedback is very good...

No one is "not being allowed".. I have made no comment as to your input, all i suggested was that as the ECM cannot read boost pressures..The participants in the thread appear to be convincing themselves there is a induction leak, where as this is not necessarily true as the actions of the car are a characteristic of a auto...

The rest of it is off thread and quite frankly evidence that you understand very little about 4.3 and 4.4 motronic systems

Jod

Yes, i am afraid i do see it like that as you knocked my opinion via Andrews and Andrew knocked my intelligence first, it is he not allowing others opinions and now you join in by supporting him when you don`t have to do that just because he has been on here a long time, and that is the way it reads.
Also i see others not just myself treated the same way and one other as an idiot! OK, so i don`t mind quips or taking the Michael but some posters post for the dig and sarcasm and that is all and not to help others but hinder.
I don`t mind as i said but i will answer as i receive without resorting to abuse or rudeness.

Andrew had an opinion which may be based on his real life experience, but has he thought that his TCV may be faulty thus giving him spikes of 15psi this is no way a normal characteristic as my auto never did this. But then if you accept that Andrews car is perfect in everyway than that is fine.

I notice you say "participants" when you really mean myself but will not say.

I think you should read the thread correctly not "induction leak" but "boost leak"!

No , you have made no comment on my content you just passed it as "off thread" and "i don`t understand" which is the easy thing to do. Maybe you can`t find an answer to it as maybe it is true.

I have been an owner of 11 Volvo`s for 16yrs and don`t just revolve around one model with it`s type of fuel system such at the Motronic 4.4 i leave that to people such as yourself!!
But i must admit i read Vadis everynight like a good book from cover to cover and it is surprising what one learns and after all apart from some obvious errors it is the early Volvo Gospel.

[Jod T5]

Originally Posted by 960kg

I think you should read the thread correctly not "induction leak" but "boost leak"!

The phrase induction leak refers to a leak on the pre induction side...A boost leak is in its very nature a induction leak...

Originally Posted by 960kg

But i must admit i read Vadis everynight like a good book from cover to cover and it is surprising what one learns and after all apart from some obvious errors it is the early Volvo Gospel.

PMSL...now that is funny....

Jod

[Jod T5]

Originally Posted by 960kg

No , you have made no comment on my content you just passed it as "off thread" and "i don`t understand" which is the easy thing to do. Maybe you can`t find an answer to it as maybe it is true.

I dont recall the "i dont understand" bit but the rest is off thread...I will ignore the last line as it too is off thread...

[960kg]

Originally Posted by Jod T5

The phrase induction leak refers to a leak on the pre induction side...A boost leak is in its very nature a induction leak...



PMSL...now that is funny....

Jod

Originally Posted by Jod T5

I dont recall the "i dont understand" bit but the rest is off thread...I will ignore the last line as it too is off thread...

You have really not lived up to your supposed knowledge or very friendly disposition on this forum to me!
You have to answer in a multithread style as you cannot remember what you have just read in one go!

Your answers are also meaning less to the original poster whose thread you have ruined due to your wanting to show your superior knowledge about Volvo`s Motornic 4.4 and to demean myself.
Yes, i believe you may well live up to what you try to portray to your multi friends and others on here but not myself.

"The phrase induction leak refers to a leak on the pre induction side...A boost leak is in its very nature a induction leak..."

You again miss the point, you are not really interested in the actual problem the OP has you just want to down me all the time!
We are talking boost leak from the Compressor side of the Turbo to the Actuator Diaphragm which in no way at all is connected to the actual induction side of the engine, it works the mechanical side of the turbo wastegate which you know very well yourself ,you are just stalling all the time with irrelevant answers on purpose so you may win over your position, sorry but i am not interested in that type of thing, i have so far lived to long to be like that.

Give it a while then you may come up with some sort of logical and not "virtual" answers to the OP`s problem. Try helping him instead of slagging me off.
I am not interested in members such as yourself i only want to help the member with a Volvo problem with my own opinion whether it comes from the laughable "Vadis" or not or my 16yrs experience of Volvo`s.
At least i do try and don`t wallow in my own self importence.

.....and i will answer whoever ask`s me questions and not say Sorry Off Topic



Have a nice day

[acshortt5]

Up until now I have avoided posting again as I could see where this was going but...

1) I have not "had a go" at 960kg at all. I have only tried to answer the OP's query.

2) My experience doesn't come from "reading VADIS". It comes from having taken apart and put back together most of the parts on my car including, but not limited to: cat back exhaust, all the induction pipework, all the PCV system including modifying it to improve it, the BCS, the radiator, the suspension inc. shocks/springs/wishbones/track rods & ends/front & rear anti roll bars/strut brace, seats, dashboard, clocks, door cards, headlights, indicators, front bumper MAF, coolant temp, crank & cam sensors, plus normal servicing including changing oil, plugs, HT leads, rotor arm, dizzy cap, air filter, cabin filter, brakes inc. rebfurbishing all four calipers, changing pads and discs, I did get some help to upgrade the hoses to goodridge items as I don't have a flaring tool and one was needed during fitting by Tim Williams. I've also changed the headunit, put in the dolby system. Plus other things that I cannot recall.
Now this isn't a case of "send it to a specialist to do", I get the parts and I do the work myself. I would not dare brag about having a good knowledge with these cars as there are others who know far more than I do. However I have a decent knowledge of how it works and how to keep a car in good order, the 6 or 7 VOC trophys in my lounge might have something to say about that ;-)

3) Time on the forum has nothing to do with it. For example a volvo tech from MRG with years of experience with these cars could join tomorrow, he/she has only just joined but will have way more experience than me.

4) I was hoping someone with more experience would have posted up a proper explanation by now. So I have done a quick google search and this is a better explanation (copied from the Megasquirt forum):

when the automatic transmission shifts, the dynamics of the engine+turbo are causing a short boost spike that probably can't be corrected - you have the turbo spinning at X speed which generates Y boost at Z CFM flow, you suddenly reduce the flow by slowing down the engine, this will cause boost to increase until the turbo can slow down to the correct RPM for the new conditions.

As Jod has said about 4.3 / 4.4 Motronic they don't have very good boost control as it doesn't have a proper MAP sensor. It calculates the boost from analysing the amount of air coming in (via the MAF sensor). The BCS is in reality more of an "on/off" switch on these models.

I'm not going to post anymore on this thread. If you don't believe me then go look on vadis or google and increase your knowledge that way rather than acting like a kid in the playground.

By all means the OP can have a look for leaks, I don't think he will find any though.

[960kg]

Originally Posted by acshortt5

Up until now I have avoided posting again as I could see where this was going but...

1) I have not "had a go" at 960kg at all. I have only tried to answer the OP's query.

2) My experience doesn't come from "reading VADIS". It comes from having taken apart and put back together most of the parts on my car including, but not limited to: cat back exhaust, all the induction pipework, all the PCV system including modifying it to improve it, the BCS, the radiator, the suspension inc. shocks/springs/wishbones/track rods & ends/front & rear anti roll bars/strut brace, seats, dashboard, clocks, door cards, headlights, indicators, front bumper MAF, coolant temp, crank & cam sensors, plus normal servicing including changing oil, plugs, HT leads, rotor arm, dizzy cap, air filter, cabin filter, brakes inc. rebfurbishing all four calipers, changing pads and discs, I did get some help to upgrade the hoses to goodridge items as I don't have a flaring tool and one was needed during fitting by Tim Williams. I've also changed the headunit, put in the dolby system. Plus other things that I cannot recall.
Now this isn't a case of "send it to a specialist to do", I get the parts and I do the work myself. I would not dare brag about having a good knowledge with these cars as there are others who know far more than I do. However I have a decent knowledge of how it works and how to keep a car in good order, the 6 or 7 VOC trophys in my lounge might have something to say about that ;-)

3) Time on the forum has nothing to do with it. For example a volvo tech from MRG with years of experience with these cars could join tomorrow, he/she has only just joined but will have way more experience than me.

4) I was hoping someone with more experience would have posted up a proper explanation by now. So I have done a quick google search and this is a better explanation (copied from the Megasquirt forum):

when the automatic transmission shifts, the dynamics of the engine+turbo are causing a short boost spike that probably can't be corrected - you have the turbo spinning at X speed which generates Y boost at Z CFM flow, you suddenly reduce the flow by slowing down the engine, this will cause boost to increase until the turbo can slow down to the correct RPM for the new conditions.

As Jod has said about 4.3 / 4.4 Motronic they don't have very good boost control as it doesn't have a proper MAP sensor. It calculates the boost from analysing the amount of air coming in (via the MAF sensor). The BCS is in reality more of an "on/off" switch on these models.

I'm not going to post anymore on this thread. If you don't believe me then go look on vadis or google and increase your knowledge that way rather than acting like a kid in the playground.

By all means the OP can have a look for leaks, I don't think he will find any though.

I don`t think you read properly my posts either you to have to have sarcastic snipes as well because remember i said i owned 11 Volvo`s over 16yrs so Vadis is not my only experience how can it be i just prefer reading factual things as regards non-fiction story books. Most of my friends are car mechanics and 3 with there own business along with me residing at Brands Hatch racing cicuit most of my younger life, so i too know a bit about performance cars. No good being 64 and know nothing i have been there and done it but i don`t brag about it as some have to let you know there position on here.

The thing is on here everyone has a part to play in helping others and some members do not like it. It is very much like a closed shop we used to have in the `60`s with the Unions. It is very noticeable and it should not happen but then as i said in one of my other "playground tantrum posts" eslewhere on here the know alls think there sh*te don`t stink and smother it on others.

Believe it or not i am a very friendly person and do no harm to others but when they do harm to me then that is another story and i stick my ground.


All what you have just posted is interesting and i do not say "Off Topic" as your supportive friend said, what an easy way out ,why comment in the first place if one disagrees with somebody`s opinion, don`t we have a right to an opinion, obviously not allowed on here as you get knocked down for it if the higher ups or longservers disagree.

I have been on the S/V40 site some three years now and never ventured here until i bought my second T5. It is the most unfriendly clickey forum i have come across, one only has to look at the Sales section to see how so many owners are intimidated, it is really disgusting.
It doesn`t bother me at all i will just keep doing what i always do so keep a look out for the next upset, they are always brewing on the back burner!

The BCS is no way an on/off switch as it varies the boost control depending on lots of variables even the temp. of the engine.

I know how it works i have been there, i think you ought to purchase a new one like i did then you will know why it is not such an instant switch.
I believe also that is what wrong with the OP`s spiking. It is not normal and i don`t care who says it is `cos it isn`t.
Also i don`t have to believe what you say your`s is only another opinion not allowed in this thread as far as i am concerned.

Also while your here read this especially 2nd post down webble88



........................Over & Also OUT..........................

[acshortt5]

Seeing as how I have bothered to explain the reasoning behind my thoughts would you be so kind as to explain how the OP's car can reach peak boost then spikes on the gear changes while having an induction leak?