TCU info needed.
Thread Starter
Super Member
Joined: Dec 2009
Posts: 826
Likes: 106
From: Sweden
2011 C63 AMG, 589hp
TCU info needed.
I think my car is hitting the programmed torquelimit in tcu unit.
But, where does the tcu get the variables to do the calculations?
Is it that simple that it takes it from Airmeters voltagelevel?
Symptoms: between everyshift the car jerks quite a lot, like it´s closing the throttle completely, and if i use the throttle my self more active, timing a liftoff just before it changes gear it is smooth and fast.
Need a bit of info about this and if is as i guess i can limit the voltage from airmeter with my AEM piggy.
I just compensate this with adding fuel in an another table instead.
A 'std' 55 engine, how high does it reach in voltage from Airmeter?
Best regards
Patrick
But, where does the tcu get the variables to do the calculations?
Is it that simple that it takes it from Airmeters voltagelevel?
Symptoms: between everyshift the car jerks quite a lot, like it´s closing the throttle completely, and if i use the throttle my self more active, timing a liftoff just before it changes gear it is smooth and fast.
Need a bit of info about this and if is as i guess i can limit the voltage from airmeter with my AEM piggy.
I just compensate this with adding fuel in an another table instead.
A 'std' 55 engine, how high does it reach in voltage from Airmeter?
Best regards
Patrick
Member
Joined: Nov 2012
Posts: 221
Likes: 4
From: San Diego, CA
2005 C55 black on black aka DVS C55, 2007 C230 sport silver on black for the boss
What reading are you looking for exactly? I think it is based on Airflow readings...
I just added a larger MAF pipe and have the same type of jerk at WOT, but before the limiter, shifts. I'm still doing some testing and tuning so let me know and I can send over some findings and readings.
.
I just added a larger MAF pipe and have the same type of jerk at WOT, but before the limiter, shifts. I'm still doing some testing and tuning so let me know and I can send over some findings and readings.
.
Thread Starter
Super Member
Joined: Dec 2009
Posts: 826
Likes: 106
From: Sweden
2011 C63 AMG, 589hp
Hi.
As i haven´t logged the airmeters behavior Before i supercharged it with bigger maf.
I would like to have voltage on idle from maf and what voltage the std Engine can reach.
This will tell me where to start, as i can modify maf voltage through the piggyback.
As i suspect the tcu takes info from this, and can i make a voltagecurve that is similar to stock the tranny wouldn´t know of any increase in torque.
Lets say std Engine can reach 4volts as maximum and my supercharged Engine even that i got ~30% bigger maf it can reach 5v no problemos, i have capped the signal at 4.72v if i remember correctly.
The 'lost' measurements in fuel i compensate in an pressuretable in the piggy instead.
And even thou the maf is 30 bigger, i´m not sure that the voltage is 30% lower than expected.
Rgds
As i haven´t logged the airmeters behavior Before i supercharged it with bigger maf.
I would like to have voltage on idle from maf and what voltage the std Engine can reach.
This will tell me where to start, as i can modify maf voltage through the piggyback.
As i suspect the tcu takes info from this, and can i make a voltagecurve that is similar to stock the tranny wouldn´t know of any increase in torque.
Lets say std Engine can reach 4volts as maximum and my supercharged Engine even that i got ~30% bigger maf it can reach 5v no problemos, i have capped the signal at 4.72v if i remember correctly.
The 'lost' measurements in fuel i compensate in an pressuretable in the piggy instead.
And even thou the maf is 30 bigger, i´m not sure that the voltage is 30% lower than expected.
Rgds
Thread Starter
Super Member
Joined: Dec 2009
Posts: 826
Likes: 106
From: Sweden
2011 C63 AMG, 589hp
In my obd scan tool i can see std ecu reporting torque, and it´s waaay high(almost 1000Nm)
I figure the std ecu calculates the torque and sends to tcu unit.
Rgds
I figure the std ecu calculates the torque and sends to tcu unit.
Rgds
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Joined: Aug 2006
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From: A.D., U.A.E
2000 (W202 C200) & 2000 (W202 C55)
Good info. Thankss for sharing..
,
when ECU calculate the torque and send it to the TCU, is it automatically will saved to the ECU or TCU data/file..??
ZAYED,,
, when ECU calculate the torque and send it to the TCU, is it automatically will saved to the ECU or TCU data/file..??
ZAYED,,
Thread Starter
Super Member
Joined: Dec 2009
Posts: 826
Likes: 106
From: Sweden
2011 C63 AMG, 589hp
Been logging and calculating idle values today, searched info of what lbs of air through maf on std '55' Engine.
As i live in Sweden i recalculated the values to gram.
I noticed many had about 3.1g per second flowing on idle.
My obd tool said i got about 2.8g per second.
This is a result of a bigger maf, the voltage will drop.
The voltage at idle was 1.24v in my setup.
I altered this value til i got my 3.1g/s, this was just a tiny 0.02v change, when piggyback receives 1.24v i let it send back to std ecu 1.26v.
Will testdrive tomorrow to see if gearchanges becomes better in cruising, sometimes it can take a while. too long i think.
my experiances is as it 'slippes' a bit more than std on low rpm cruising when shifting.
To make smooth shifting for a comfortable ride.
After i sorted this out i will try to cap the voltage to a level where it reports about 550Nm to tcu.
Edit: dunno if the values are correct for an c55 but full throttle should be at tops 4.4v, mine is maxing out at 5v even thou i´ve got 30% bigger maf, as we speak i cap the voltage at 4.76v as the std ecu doesn´t give me a CEL with this value, i will try to cap it lower later on after i tested it tomorrow, but it will take some time as i need to get the fuelmap correct in piggy.
As i live in Sweden i recalculated the values to gram.
I noticed many had about 3.1g per second flowing on idle.
My obd tool said i got about 2.8g per second.
This is a result of a bigger maf, the voltage will drop.
The voltage at idle was 1.24v in my setup.
I altered this value til i got my 3.1g/s, this was just a tiny 0.02v change, when piggyback receives 1.24v i let it send back to std ecu 1.26v.
Will testdrive tomorrow to see if gearchanges becomes better in cruising, sometimes it can take a while. too long i think.
my experiances is as it 'slippes' a bit more than std on low rpm cruising when shifting.
To make smooth shifting for a comfortable ride.
After i sorted this out i will try to cap the voltage to a level where it reports about 550Nm to tcu.
Edit: dunno if the values are correct for an c55 but full throttle should be at tops 4.4v, mine is maxing out at 5v even thou i´ve got 30% bigger maf, as we speak i cap the voltage at 4.76v as the std ecu doesn´t give me a CEL with this value, i will try to cap it lower later on after i tested it tomorrow, but it will take some time as i need to get the fuelmap correct in piggy.
Last edited by swedepat; Sep 21, 2014 at 12:34 PM.
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Thread Starter
Super Member
Joined: Dec 2009
Posts: 826
Likes: 106
From: Sweden
2011 C63 AMG, 589hp
And ,, one shouldn´t smile to early, but..
Testdrive to work this morning, lowload shifting was exactly as std, no extra 'slip' between shifting as it was earlier.
I also capped off at 4.4v and shifting was fast and hard at full throttle, but!!!!
to early to say it´s perfect on full load yet, it was rainy this morning and very very slippery.
But low load feels much better, promising
Testdrive to work this morning, lowload shifting was exactly as std, no extra 'slip' between shifting as it was earlier.
I also capped off at 4.4v and shifting was fast and hard at full throttle, but!!!!
to early to say it´s perfect on full load yet, it was rainy this morning and very very slippery.
But low load feels much better, promising
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Thread Starter
Super Member
Joined: Dec 2009
Posts: 826
Likes: 106
From: Sweden
2011 C63 AMG, 589hp
Got home about 10minutes ago, been out testing, the road has dried.
Low load shifting = perfect!!!
Full load = paus/jerks 'cut in half' in time, much faster shifting with less jerking, not perfect yet thou, a bit more tuning on this and we might have a winner.
As we speak i 'cap' the voltage as earlier stated at 4.4v
Will test lower volt some other day this week.
Really promising!
But one thing that can be called jawdropper, i got MORE power above 6000rpm, now it pulls equal as below 6000, if i could raise the rpmlimit the Engine would easily rev 8000rpm, but won´t do that, need h-profile rods,forged pistons etc etc..
Rgds
Low load shifting = perfect!!!
Full load = paus/jerks 'cut in half' in time, much faster shifting with less jerking, not perfect yet thou, a bit more tuning on this and we might have a winner.
As we speak i 'cap' the voltage as earlier stated at 4.4v
Will test lower volt some other day this week.
Really promising!
But one thing that can be called jawdropper, i got MORE power above 6000rpm, now it pulls equal as below 6000, if i could raise the rpmlimit the Engine would easily rev 8000rpm, but won´t do that, need h-profile rods,forged pistons etc etc..
Rgds
Member
Joined: Nov 2012
Posts: 221
Likes: 4
From: San Diego, CA
2005 C55 black on black aka DVS C55, 2007 C230 sport silver on black for the boss
You altered the values using the AEM unit?
Air into MAF, low reading into piggy which alters value, into ecu?
Thanks
Thread Starter
Super Member
Joined: Dec 2009
Posts: 826
Likes: 106
From: Sweden
2011 C63 AMG, 589hp
Zayed 
ED.. Yes, the beauty of piggyback, you can alter almost anything to get the std ecu thinking the engine is 'untouched'.
Yes, i added a small amount of volt to the signal from MAF before the piggy sends the signal to std ecu, made a HUGE difference.
As i was tuning yesterday to get the full load correct(AFR) i can say in rough, that when i withdrawed 0.36v from the capped value(from 4.76v to 4.4v) this was in my setup about 12-13% of fuel i had to add at the pressuretable in the piggy.
Rgds
ED.. Yes, the beauty of piggyback, you can alter almost anything to get the std ecu thinking the engine is 'untouched'.
Yes, i added a small amount of volt to the signal from MAF before the piggy sends the signal to std ecu, made a HUGE difference.
As i was tuning yesterday to get the full load correct(AFR) i can say in rough, that when i withdrawed 0.36v from the capped value(from 4.76v to 4.4v) this was in my setup about 12-13% of fuel i had to add at the pressuretable in the piggy.
Rgds
Thread Starter
Super Member
Joined: Dec 2009
Posts: 826
Likes: 106
From: Sweden
2011 C63 AMG, 589hp
nah.. not even half a man
but,, end of season, Autumn came in hard here in Sweden, i hoped to sort this out before it came.
But it´s so slippery out in the wet(it rains hard) so i can´t tell any difference.
So yesterday i put her in the garage for the winter.
Now awating some updates on small things here and there.
Rgds
but,, end of season, Autumn came in hard here in Sweden, i hoped to sort this out before it came.
But it´s so slippery out in the wet(it rains hard) so i can´t tell any difference.
So yesterday i put her in the garage for the winter.
Now awating some updates on small things here and there.
Rgds
