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I had an issue with what seemed to be a flat spot/hesitation a few years ago.


See post #4

Does your recirc valve still whistle on part throttle?
 

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Discussion Starter · #28 ·
I had an issue with what seemed to be a flat spot/hesitation a few years ago.


See post #4

Does your recirc valve still whistle on part throttle?
Many thanks for this Lee. Due to the fact that I'm completely new to this engine, losing my whistle is lost on me - can't say I've ever noticed one TBH, but than I am a bit deaf into the bargain.

So, where is the recirc valve??
 

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Discussion Starter · #29 ·
Many thanks for this Lee. Due to the fact that I'm completely new to this engine, losing my whistle is lost on me - can't say I've ever noticed one TBH, but than I am a bit deaf into the bargain.

So, where is the recirc valve??
I had an issue with what seemed to be a flat spot/hesitation a few years ago.


See post #4

Does your recirc valve still whistle on part throttle?
OK, found the recirc valve!
 

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Discussion Starter · #30 ·
OK, so I managed a longer run with the laptop recording last night. Mixture of urban and rural motoring, so I hope this is a more sensible set of data. If anyone could take a look and see if there is anything obvious i'd be very grateful.

 

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OK, so I managed a longer run with the laptop recording last night. Mixture of urban and rural motoring, so I hope this is a more sensible set of data. If anyone could take a look and see if there is anything obvious i'd be very grateful.

Had a look at the data, bear in mind I do not now the history of the car and the modifications just commenting the log. MAF air and voltage looks OK (idle, rpms), fuel pressure Ok, wastegate almost 90% closed when starting to boost so OK, 0,9 to 1 bar of overboost on 3000 rpm (viewing the few small acceleration bursts you did to 3500 rpm) would have helped if you hold the gas further to see the boost development. Is it a stock map that is on?

I have seen the one acceleration till 5000 rpm, you were accelerating first full throttle till 3500 rpm and then at half throttle till 5500 rpm?

Has the boost solenoid been changed recently or is it on the first one?
 

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Discussion Starter · #32 ·
Had a look at the data, bear in mind I do not now the history of the car and the modifications just commenting the log. MAF air and voltage looks OK (idle, rpms), fuel pressure Ok, wastegate almost 90% closed when starting to boost so OK, 0,9 to 1 bar of overboost on 3000 rpm (viewing the few small acceleration bursts you did to 3500 rpm) would have helped if you hold the gas further to see the boost development. Is it a stock map that is on?

I have seen the one acceleration till 5000 rpm, you were accelerating first full throttle till 3500 rpm and then at half throttle till 5500 rpm?

Has the boost solenoid been changed recently or is it on the first one?
As far as I know, it's a stock map (any way I can tell from FORScan?) Probably not enough suitable road to hold full throttle to 5500rpm. Original boost solenoid as far as I know. I have plenty of previous owners paperwork, and I can't see any of the induction/turbo/intercooler parts being replaced. It's done 97k now, and I don't think it's been driven particularly hard.

I had a good look at the symposer when it was off, the diaphragm looked like new, no splits or anything, however, there was a very small hole in one side of the housing - looks like it's supposed to be there, but it's still a hole!
 

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Discussion Starter · #33 ·
Had a look at the data, bear in mind I do not now the history of the car and the modifications just commenting the log. MAF air and voltage looks OK (idle, rpms), fuel pressure Ok, wastegate almost 90% closed when starting to boost so OK, 0,9 to 1 bar of overboost on 3000 rpm (viewing the few small acceleration bursts you did to 3500 rpm) would have helped if you hold the gas further to see the boost development. Is it a stock map that is on?

I have seen the one acceleration till 5000 rpm, you were accelerating first full throttle till 3500 rpm and then at half throttle till 5500 rpm?

Has the boost solenoid been changed recently or is it on the first one?
Sorry, forgot to thank you for taking a look, it's very much appreciated.
 

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As far as I know, it's a stock map (any way I can tell from FORScan?) Probably not enough suitable road to hold full throttle to 5500rpm. Original boost solenoid as far as I know. I have plenty of previous owners paperwork, and I can't see any of the induction/turbo/intercooler parts being replaced. It's done 97k now, and I don't think it's been driven particularly hard.

I had a good look at the symposer when it was off, the diaphragm looked like new, no splits or anything, however, there was a very small hole in one side of the housing - looks like it's supposed to be there, but it's still a hole!
Yea, I know :) but 3rd gear full throttle to at least 5500-6000 rpm tells a lot. You got 0.9-1 bar (15 deg C) on 3500 rpm and then you drove with half throttle further to 5500 rpm. Anyhow since the rest of the parts are stock we can presume that the map is also stock. This log does not point out some kind of error (even though fuel trims are missing in the log etc.).

My guess would be that with this small hesitation you are getting a typical behaviour of a stock lazy ST on a stock map, with stock ECU which only wants to lower the emissions adapting to slow driving only (the suggested KAM reset). When it is driven with partial throttle on low revs 2000-3000 rpm in the first 3 gears the car does not now if the driver wants to "go or stop". This is the spot in the throttle near the vacum and boost border (it is even more noticable when the aircon is on, like a hick-up). Now this all is supported by as you say old and "tired" components like MAF, MAP sensor, and especially the boost solenoid.

If I were you I would risk it and put a new boost solenoid in for 40 Pounds and check the wastegate and the recirc valve while at it (before going to a specialist for a bit more money).
After that make a nice remap, strip the interior and of you go!

EDIT: Check this topic out True standard st noise , member Nick explains this in the posts nr #25 #30
 

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Discussion Starter · #35 ·
Yea, I know :) but 3rd gear full throttle to at least 5500-6000 rpm tells a lot. You got 0.9-1 bar (15 deg C) on 3500 rpm and then you drove with half throttle further to 5500 rpm. Anyhow since the rest of the parts are stock we can presume that the map is also stock. This log does not point out some kind of error (even though fuel trims are missing in the log etc.).

My guess would be that with this small hesitation you are getting a typical behaviour of a stock lazy ST on a stock map, with stock ECU which only wants to lower the emissions adapting to slow driving only (the suggested KAM reset). When it is driven with partial throttle on low revs 2000-3000 rpm in the first 3 gears the car does not now if the driver wants to "go or stop". This is the spot in the throttle near the vacum and boost border (it is even more noticable when the aircon is on, like a hick-up). Now this all is supported by as you say old and "tired" components like MAF, MAP sensor, and especially the boost solenoid.

If I were you I would risk it and put a new boost solenoid in for 40 Pounds and check the wastegate and the recirc valve while at it (before going to a specialist for a bit more money).
After that make a nice remap, strip the interior and of you go!

EDIT: Check this topic out True standard st noise , member Nick explains this in the posts nr #25 #30
Thank you Marco, I think that's sound advice and a good call. OEM solenoid or aftermarket?
 

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Discussion Starter · #36 ·
Yea, I know :) but 3rd gear full throttle to at least 5500-6000 rpm tells a lot. You got 0.9-1 bar (15 deg C) on 3500 rpm and then you drove with half throttle further to 5500 rpm. Anyhow since the rest of the parts are stock we can presume that the map is also stock. This log does not point out some kind of error (even though fuel trims are missing in the log etc.).

My guess would be that with this small hesitation you are getting a typical behaviour of a stock lazy ST on a stock map, with stock ECU which only wants to lower the emissions adapting to slow driving only (the suggested KAM reset). When it is driven with partial throttle on low revs 2000-3000 rpm in the first 3 gears the car does not now if the driver wants to "go or stop". This is the spot in the throttle near the vacum and boost border (it is even more noticable when the aircon is on, like a hick-up). Now this all is supported by as you say old and "tired" components like MAF, MAP sensor, and especially the boost solenoid.

If I were you I would risk it and put a new boost solenoid in for 40 Pounds and check the wastegate and the recirc valve while at it (before going to a specialist for a bit more money).
After that make a nice remap, strip the interior and of you go!

EDIT: Check this topic out True standard st noise , member Nick explains this in the posts nr #25 #30
OEM solenoid from Matt Lewis Motorsport, £48 all in.
 

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Mate I've just posted about how cleaning all my earthing points seem to have gotten rid of my hesitation (read it on here) and what I believe was also over fuelling. May be worth checking if you haven't all ready.
 

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Discussion Starter · #39 ·
Mate I've just posted about how cleaning all my earthing points seem to have gotten rid of my hesitation (read it on here) and what I believe was also over fuelling. May be worth checking if you haven't all ready.
Hello, many thanks for that suggestion, can you pint me in the direction of where they are? Totally new to this car. Many thanks.
 

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Hello, many thanks for that suggestion, can you pint me in the direction of where they are? Totally new to this car. Many thanks.
 
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