Tune issue?
05-02-2015, 08:10 AM
#1
Member
Thread Starter
Tune issue?
Trying to get car ready for dyno this Thursday. 77fsp with fuel and everything else.
Car is throwing MAP sensor code on cold mornings. While car was at Mercedes getting fuel tank recall done i had new MAP sensor installed. Driving this morning and MAP code comes back on.
Tune is now where close to where it should be. Can this be tune related? Dont wanna drive 2HRS to dyno and still have a MAP issue????
THANKS!
Car is throwing MAP sensor code on cold mornings. While car was at Mercedes getting fuel tank recall done i had new MAP sensor installed. Driving this morning and MAP code comes back on.
Tune is now where close to where it should be. Can this be tune related? Dont wanna drive 2HRS to dyno and still have a MAP issue????
THANKS!
05-02-2015, 09:41 AM
#2
Super Member
Trying to get car ready for dyno this Thursday. 77fsp with fuel and everything else.
Car is throwing MAP sensor code on cold mornings. While car was at Mercedes getting fuel tank recall done i had new MAP sensor installed. Driving this morning and MAP code comes back on.
Tune is now where close to where it should be. Can this be tune related? Dont wanna drive 2HRS to dyno and still have a MAP issue????
THANKS!
Car is throwing MAP sensor code on cold mornings. While car was at Mercedes getting fuel tank recall done i had new MAP sensor installed. Driving this morning and MAP code comes back on.
Tune is now where close to where it should be. Can this be tune related? Dont wanna drive 2HRS to dyno and still have a MAP issue????
THANKS!
As of yet, no one has figured out a tune that overrides the map sensor problem. Map clamp it and call it a day.
https://splitsec.com/product/vc3-100-voltage-clamp/
05-02-2015, 10:38 AM
#3
Member
Thread Starter
Stupid thing throws code at regular crusing. This morning i was only doing 35mph on light throttle. Cleared code and drove fine after. Only when lower than 60deg. Car is going into limp mode which pissed me off. Was behind a FRC Z06 that wanted to play. Had to pull over and reset ecu.
05-02-2015, 12:00 PM
#5
Super Member
05-02-2015, 12:08 PM
#6
Super Member
Stupid thing throws code at regular crusing. This morning i was only doing 35mph on light throttle. Cleared code and drove fine after. Only when lower than 60deg. Car is going into limp mode which pissed me off. Was behind a FRC Z06 that wanted to play. Had to pull over and reset ecu.
05-02-2015, 12:54 PM
#7
MBWorld Fanatic!
Trending Topics
05-02-2015, 01:03 PM
#8
Super Member
05-02-2015, 01:16 PM
#9
Look at my thread titled 80mm fsp saga. You have the exact symptoms I had. Might be time to get a good datalogger with wideband.
I would cancel your dyno tune until you get those issues resolved first.
What you are experiencing is what some have labeled "hiccups" (happens at cruising) and "cold starts issues" (happens when the car is first started after being left usually overnight or after a 8 plus hour workday). I had plenty of that for the past few months. Got logged, sent that logged maps to Tony at BIP, hasn't happened since.
I would cancel your dyno tune until you get those issues resolved first.
What you are experiencing is what some have labeled "hiccups" (happens at cruising) and "cold starts issues" (happens when the car is first started after being left usually overnight or after a 8 plus hour workday). I had plenty of that for the past few months. Got logged, sent that logged maps to Tony at BIP, hasn't happened since.
05-02-2015, 01:19 PM
#10
Member
Thread Starter
I have a nDash with dual widebands. Doing a full custom tune on Thursday. Issue can't be fixed then?
Just making sure it software related before i drive 2.5hrs?????
Just making sure it software related before i drive 2.5hrs?????
Last edited by KnoxE55amg; 05-02-2015 at 01:20 PM. Reason: Add on
05-02-2015, 01:29 PM
#11
I won't say it cannot be fixed on the dyno, but based on my experiences, it will be difficult. You have to actually simulate those things to tune them out. Remember the car is looking for the clutch activation and deactivation, something that is no longer happening.
You have to cruise on the dyno for as long as it takes to get a hiccup so your tuner can tune it out. then leave the car strapped to the dyno preferably overnight so you can get a cold start issue and then he or she can tune that out too.
Or you can datalog those events with your Ndash and wideband, have that tuned out first, then go get dyno tuned.
That's what I'm doing. Still working on it with fantastic results so far
Now there is always a chance you may not need to actually simulate those events to have them tuned out, but unfortunately I cannot tell you that for sure. I do know that in the past when I tuned Toyota's and Lexus' , street tuning was the most effective at fixing drivability issues. Dyno tuning was reserved for power improvements
You have to cruise on the dyno for as long as it takes to get a hiccup so your tuner can tune it out. then leave the car strapped to the dyno preferably overnight so you can get a cold start issue and then he or she can tune that out too.
Or you can datalog those events with your Ndash and wideband, have that tuned out first, then go get dyno tuned.
That's what I'm doing. Still working on it with fantastic results so far
Now there is always a chance you may not need to actually simulate those events to have them tuned out, but unfortunately I cannot tell you that for sure. I do know that in the past when I tuned Toyota's and Lexus' , street tuning was the most effective at fixing drivability issues. Dyno tuning was reserved for power improvements
Last edited by kponti; 05-02-2015 at 01:33 PM.
05-02-2015, 01:35 PM
#12
Super Member
I won't say it cannot be fixed on the dyno, but based on my experiences, it will be difficult. You have to actually simulate those things to tune them out. Remember the car is looking for the clutch activation and deactivation, something that is no longer happening.
You have to cruise on the dyno for as long as it takes to get a hiccup so your tuner can tune it out. then leave the car strapped to the dyno preferably overnight so you can get a cold start issue and then he or she can tune that out too.
Or you can datalog those events with your Ndash and wideband, have that tuned out first, then go get dyno tuned.
That's what I'm doing. Still working on it with fantastic results so far
Now there is always a chance you may not need to actually simulate those events to have them tuned out, but unfortunately I cannot tell you that for sure. I do know that in the past when I tuned Toyota's and Lexus' , street tuning was the most effective at fixing drivability issues. Dyno tuning was reserved for power improvements
You have to cruise on the dyno for as long as it takes to get a hiccup so your tuner can tune it out. then leave the car strapped to the dyno preferably overnight so you can get a cold start issue and then he or she can tune that out too.
Or you can datalog those events with your Ndash and wideband, have that tuned out first, then go get dyno tuned.
That's what I'm doing. Still working on it with fantastic results so far
Now there is always a chance you may not need to actually simulate those events to have them tuned out, but unfortunately I cannot tell you that for sure. I do know that in the past when I tuned Toyota's and Lexus' , street tuning was the most effective at fixing drivability issues. Dyno tuning was reserved for power improvements
05-02-2015, 02:11 PM
#13
