Syvecs ECU on the S6
Discussion
I know Syvecs has been mentioned in several threads, but I thought it would be good to have a dedicated thread on it.
Certainly sounds very interesting. The wide lambda, knock sensor and sequential ignition really looks like it moves the game on (I'm told that if I'd had a Syvecs then the detonation that wrecked my 1st S6 engine simply wouldn't have happened), the built-in Traction Control is a big bonus and the idea of running multiple engine maps, one of which could be an economy one for motorway driving, sounds very interesting too.
Certainly sounds very interesting. The wide lambda, knock sensor and sequential ignition really looks like it moves the game on (I'm told that if I'd had a Syvecs then the detonation that wrecked my 1st S6 engine simply wouldn't have happened), the built-in Traction Control is a big bonus and the idea of running multiple engine maps, one of which could be an economy one for motorway driving, sounds very interesting too.
JonRB said:
I know Syvecs has been mentioned in several threads, but I thought it would be good to have a dedicated thread on it.
Certainly sounds very interesting. The wide lambda, knock sensor and sequential ignition really looks like it moves the game on (I'm told that if I'd had a Syvecs then the detonation that wrecked my 1st S6 engine simply wouldn't have happened), the built-in Traction Control is a big bonus and the idea of running multiple engine maps, one of which could be an economy one for motorway driving, sounds very interesting too.
Does the knock sensor work reliably on S6 engines as they are rather noisy. TVR Power think not, I had a breif discussion with them last week on the subject.Certainly sounds very interesting. The wide lambda, knock sensor and sequential ignition really looks like it moves the game on (I'm told that if I'd had a Syvecs then the detonation that wrecked my 1st S6 engine simply wouldn't have happened), the built-in Traction Control is a big bonus and the idea of running multiple engine maps, one of which could be an economy one for motorway driving, sounds very interesting too.
blueg33 said:
Does the knock sensor work reliably on S6 engines as they are rather noisy. TVR Power think not, I had a breif discussion with them last week on the subject.
Racing Green's opinion is that the FFF head makes the engine quieter, but also the Syvecs has enough information to listen to the correct cylinder at the correct time, which filters out extraneous noise a lot. It sounds reasonable but I'm not an engineer so I can't comment. Sounds lovely, but how much would it cost? Surely something went wrong with your engine which then caused the detonation/failure? Why not find the source and fix it so it doesn't happen again?
Sorry to hear about the failure though, seems you're getting through Speed Sixes faster than any other recent model owner
Sorry to hear about the failure though, seems you're getting through Speed Sixes faster than any other recent model owner
Targarama said:
Sounds lovely, but how much would it cost? Surely something went wrong with your engine which then caused the detonation/failure? Why not find the source and fix it so it doesn't happen again?
Sorry to hear about the failure though, seems you're getting through Speed Sixes faster than any other recent model owner
My current failure (which is only my 2nd) was a slipped valve seat, which is one of the few bits of the engine that wasn't touched when the engine was completely rebuilt with a new block 3 years ago. And a knock sensor would have prevented that detonation of 3 years ago. Sorry to hear about the failure though, seems you're getting through Speed Sixes faster than any other recent model owner
I think the Syvecs is somewhere around the £1500 mark? In that ballpark anyway.
JonRB said:
My current failure (which is only my 2nd) was a slipped valve seat, which is one of the few bits of the engine that wasn't touched when the engine was completely rebuilt with a new block 3 years ago. And a knock sensor would have prevented that detonation of 3 years ago.
I think the Syvecs is somewhere around the £1500 mark? In that ballpark anyway.
If that includes a rolling road/map and all the sensors fitted then it sounds like a good price. Guess you'd need to run the engine in first.I think the Syvecs is somewhere around the £1500 mark? In that ballpark anyway.
rm55 said:
But who told you that? Was it the people selling the Syvecs ECU?
It was Racing Green cars, for whom I have been a customer for around 5 years and have a good relationship with.However, it's not really a leap of intuition to believe that an ECU with a knock sensor that can retard the ignition to prevent detonation would have prevented engine damage due to detonation, is it?
JonRB said:
It was Racing Green cars, for whom I have been a customer for around 5 years and have a good relationship with.
However, it's not really a leap of intuition to believe that an ECU with a knock sensor that can retard the ignition to prevent detonation would have prevented engine damage due to detonation, is it?
The engine suffers a lot of mechanical noise as it is a finger follower engine hence the skepticism of the knock sensor, the demo was running a sensor though? However, it's not really a leap of intuition to believe that an ECU with a knock sensor that can retard the ignition to prevent detonation would have prevented engine damage due to detonation, is it?
Hi All
Its a shame the other thread got deleted a while back as i did go into alot of detail about the knock control on the Syvecs.
First thing to clear up is i have seen a few people mention the syvecs as a Chip... This is incorrect the Syvecs is a full standalone ecu which replaces the Stock MBE completely.
Time and time again i have been told that the Speed six is a too noisy engine for knock control and what i can say is Yes with most ecu's it would be difficult with all the background noise but with a Syvecs it works great. The reason for this is with the Syvecs we fit a Wideband knock sensor which we tell to listens only at a certain frequency in which knock will occur at based on the Cylinder bore size and stroke of the engine so this filters out a lot of noise on its own. We then ask for the knock control to listen at a set period just before the combustion happens and just after to also filter out a lot of noise.
Also as the ecu knows which cylinder its firing it works the knock control based on each cylinder so if one cylinder is knocking it just retards that cylinder. If the knock control ends up pulling more than 10 degrees because the knocking is that bad it will shut down the cylinder.
Here is a log to show the knock sensor picking up no knock on a Standard Speed Six a couple of weeks ago
Here is the same engine with a log from the knock sensor picking up some knock. Notice how the lambda changes when the knock occurs from the Syvecs doing it stuff to protect the engine.
Ryan
Its a shame the other thread got deleted a while back as i did go into alot of detail about the knock control on the Syvecs.
First thing to clear up is i have seen a few people mention the syvecs as a Chip... This is incorrect the Syvecs is a full standalone ecu which replaces the Stock MBE completely.
Time and time again i have been told that the Speed six is a too noisy engine for knock control and what i can say is Yes with most ecu's it would be difficult with all the background noise but with a Syvecs it works great. The reason for this is with the Syvecs we fit a Wideband knock sensor which we tell to listens only at a certain frequency in which knock will occur at based on the Cylinder bore size and stroke of the engine so this filters out a lot of noise on its own. We then ask for the knock control to listen at a set period just before the combustion happens and just after to also filter out a lot of noise.
Also as the ecu knows which cylinder its firing it works the knock control based on each cylinder so if one cylinder is knocking it just retards that cylinder. If the knock control ends up pulling more than 10 degrees because the knocking is that bad it will shut down the cylinder.
Here is a log to show the knock sensor picking up no knock on a Standard Speed Six a couple of weeks ago
Here is the same engine with a log from the knock sensor picking up some knock. Notice how the lambda changes when the knock occurs from the Syvecs doing it stuff to protect the engine.
Ryan
Yes good explanation and pretty much my understanding of how it works but with the details filled in. 
Not sure why Power say they won't work though as they clearly do......unless they've just trialled narrow band "dumb" stand alone knock sensors which I suppose probably don't work too well?
Not sure why Power say they won't work though as they clearly do......unless they've just trialled narrow band "dumb" stand alone knock sensors which I suppose probably don't work too well?SAGRIFF said:
I don't want a TVR with TC, can it be turned off?
Yes. The Syvecs has enough memory for a number of maps and a rotary switch to select them, so any or all could have TC disabled. It also raises the interesting possibility of having one of those maps optimised for motorway cruising to increase range (by increasing economy at the expense of performance). Personally the idea of TC for use in the wet and/or when not pressing on is quite appealing.
Edited by JonRB on Thursday 9th June 10:08
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