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Does anyone know if the throttle response varies with driving mode?
A lot of people complain about lag, which I describe as lazy throttle progression, in the pedal response. What I'm ultimately wondering is if there are SEPARATE tables for throttle to torque demand per mode.
In my old E46 M3, for example, when you put it in Sport, the throttle becomes (annoyingly) very responsive.
If that's the case, we could do that for Sport or Track, making them more aggressive, while leaving Tour alone.
But I don't know if there's one table or four (and I've never seen any of them).
Thanks DSO, hadn't seen that, so I went and found it. It does seem to indicate that there are multiple different throttle progression tables.
Looks like it should be possible to just modify the Sport or Track versions, then.
You are making an assumption that there are different tables in the ECM for those modes when it is highly possible there is only one table. When the mode switch is moved to different modes it might select a different program in the EBCM that sends an instruction to the ECM that tells it to modify access to the table so throttle progression is modified. That way GM only needs one table and only has to provide updates for one table in case they have issues in the field. The EBCM only needs to have its parameters changed to change throttle progression but Tuners can't get into the EBCM and wouldn't know what to look for if they did. The modification could be something as simple as telling the ECM to modify the value in cells xxx through yyy by subtracting or adding a specific value.
You are making an assumption that there are different tables in the ECM for those modes when it is highly possible there is only one table. When the mode switch is moved to different modes it might select a different program in the EBCM that sends an instruction to the ECM that tells it to modify access to the table so throttle progression is modified. That way GM only needs one table and only has to provide updates for one table in case they have issues in the field. The EBCM only needs to have its parameters changed to change throttle progression but Tuners can't get into the EBCM and wouldn't know what to look for if they did. The modification could be something as simple as telling the ECM to modify the value in cells xxx through yyy by subtracting or adding a specific value.
Ah, Bill's a smart guy and knows a lot of stuff, but he's slightly underestimating the recalibration community and confusing ability with legality/exposure.
Does anybody actually notice a difference in throttle response between drive modes? I can't tell a difference except for weather mode.
There is no difference in the Driver Demand tables, there is a slight difference around 90% throttle only and Sport/Track is lower (power demand) in that area than Touring.
There is no difference in the Driver Demand tables, there is a slight difference around 90% throttle only and Sport/Track is lower (power demand) in that area than Touring.
Where'd you find that? ie: Where do they keep the scalar or function or spare tables or whatever they use to change the response by mode?
Seems to be some level of secrecy about it, or at least people are not very forthcoming about what they know.
There is no difference in the Driver Demand tables, there is a slight difference around 90% throttle only and Sport/Track is lower (power demand) in that area than Touring.
But why in the owners manual, they show it as being different?
Where'd you find that? ie: Where do they keep the scalar or function or spare tables or whatever they use to change the response by mode?
Seems to be some level of secrecy about it, or at least people are not very forthcoming about what they know.
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Just based on the driver demand tables in the tune. If GM changes the voltage curve, like an aftermarket throttle piggyback, then they might do it outside the ECM, Ford has both driver demand tables and throttle voltage tables in the ECM, though.....and coupled with people not feeling a difference, nor do I, I don't think there is one.
Originally Posted by Maxpowers
But why in the owners manual, they show it as being different?
I dunno, everyone else does it, maybe GM's is just really subtle.
There is no difference in the Driver Demand tables, there is a slight difference around 90% throttle only and Sport/Track is lower (power demand) in that area than Touring.
In HPT, we have Driver Demand tables a,b,and c. I have modified them all, but I was warned to never copy/paste those tables, but to modify each one separate, which I did. It is unclear to me if the 3 tables relate to different driving modes....
John
Edit: for those thinking that the vitesse controller eliminates all the lag, you are wrong and I could datalog you for free to prove it.
In HPT, we have Driver Demand tables a,b,and c. I have modified them all, but I was warned to never copy/paste those tables, but to modify each one separate, which I did. It is unclear to me if the 3 tables relate to different driving modes....
John
I copy paste them all the time, including to the Reduced Engine Power table, because who wants to have actual Reduced Engine Power just because the warning light comes on? I hope I am smart enough to let off the gas if something trips the limits.
This way I can actually drive the car to a safe place with more than 3 HP.
Throttle response by driving mode?
I hope I am smart enough to let off the gas if something trips the limits.