Is it ok to have C63 w LT + downpipe + intake withou tune for a while?
11-03-2011, 02:30 PM
#1
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Brabus K8 E55 05
Is it ok to have C63 w LT + downpipe + intake withou tune for a while?
One of my friends has C63 stock and he has LT, downpipe, CF intake, and K&N filters not installed yet. He would like to install them ASAP but wants to drive the car without tune for a while. Will his power decrease or increase or stay the same?
His car is 2009.
His car is 2009.
11-03-2011, 02:45 PM
#2
MBWorld Fanatic!
It will most likely lead to some A/F ratio issues, I would not recomend it
11-03-2011, 02:48 PM
#3
MBWorld Fanatic!
. So better to wait then install all + tune !!!!
11-03-2011, 03:05 PM
#5
With the installation of these hardware parts, the engine will be moving a lot more air. But, the stock fuel maps will only inject a set amount of fuel. So, you have more air, but insufficient fuel. This can lead to a lean state which would not be advisable if you want to push the engine to higher rpms.
11-03-2011, 03:37 PM
#6
If you're running LTH's with a downpipe, there is almost certainly something wrong!
The answer to your question is "probably not". The question for you is what is your risk tolerance?
The answer to your question is "probably not". The question for you is what is your risk tolerance?
11-03-2011, 04:17 PM
#7
Which one were you responding "probably not" to?
Just curious.
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11-03-2011, 04:30 PM
#8
Somehow I read it, and assumed he was talking about reliability.
Power will increase. Increased flow=increased power. Only issue is if you set off a sensor and the car goes into safe mode.
11-03-2011, 04:33 PM
#9
I appreciate the feedback.
11-03-2011, 05:20 PM
#10
Super Member
With the installation of these hardware parts, the engine will be moving a lot more air. But, the stock fuel maps will only inject a set amount of fuel. So, you have more air, but insufficient fuel. This can lead to a lean state which would not be advisable if you want to push the engine to higher rpms.
am i understanding this correctly?
11-03-2011, 05:28 PM
#11
Historically, catback exhausts have not been shown to create AFR issues. But, LT's, which remove cats are a completely different story. They exhaust much more air than stock manifolds and because of this, the engine can pump much more air than stock.
11-03-2011, 05:39 PM
#12
MBWorld Fanatic!
LTH's without a tune is not recommended. His engine is going to run lean and throw off the air fuel ratio.
Last edited by _AMG_; 11-04-2011 at 02:14 PM.
11-03-2011, 09:51 PM
#13
Like another poster said, the ECU can adjust the AF, but only to a certain degree. It wont compensate for headers.
To the OP: Google, "Detention"
Too much air not enough fuel. Need to tune. Or ping ping ping.
11-04-2011, 02:52 PM
#17
