Ecu Tuning after Final Drive Swap

[Toyota86.ir]

I have no idea about ecu tuning after Final Drive swap.
I know after FD swap the engine load change in each gear and i know AFR and timing tables have various value in each rpm and load .

it seems ecu tuning after FD swap is meaningless but i like to know more information about this subject.

let me know if i think wrong : in dyno tuning the engine pull constant load and the tuner just adjust afr/timing/cam in one value of load/rpm , do they fill other value of tables with multiplying in an constant (for each load)?

please let me know a better view about ecu tuning in various loads.

[steve99]

Originally Posted by Toyota86.ir

I have no idea about ecu tuning after Final Drive swap.
I know after FD swap the engine load change in each gear and i know AFR and timing tables have various value in each rpm and load .

it seems ecu tuning after FD swap is meaningless but i like to know more information about this subject.

let me know if i think wrong : in dyno tuning the engine pull constant load and the tuner just adjust afr/timing/cam in one value of load/rpm , do they fill other value of tables with multiplying in an constant (for each load)?

please let me know a better view about ecu tuning in various loads.

the car derives speed ino from wheel sensors so finial drive swap want effect speed reading.

it will however throw od the gear display in dash and you may need to alter the ecu to compensate tables are "gear determination thresholds"

elsewise should be ok ecu use derived engine loads to determine timing fueling cam timing ect not speed .or gear

[Kodename47]

Don't confuse engine load with the load calculation that the ECU uses. The engine calculations are based on grams of air per revolution, that won't change by changing a FD.

[Toyota86.ir]

Originally Posted by steve99

the car derives speed ino from wheel sensors so finial drive swap want effect speed reading.

it will however throw od the gear display in dash and you may need to alter the ecu to compensate tables are "gear determination thresholds"

elsewise should be ok ecu use derived engine loads to determine timing fueling cam timing ect not speed .or gear

the gear indicator is not my problem.

Originally Posted by Kodename47

Don't confuse engine load with the load calculation that the ECU uses. The engine calculations are based on grams of air per revolution, that won't change by changing a FD.

In my mind the load is the force needed to rotate the wheels in a specific rpm , it means the load increase when the car weight increase or when the car goes to uphill.

i want to know what happen to ecu in these various loads?
do ecu change AFR/timing/cam in uphill/downhill?

let me know if i think wrong :
it seems ecu will retard timing in uphill (high load on engine) , if ecu do that it should advance timing in downhill. if ecu change timing in various loads then it should change the timing after FD swap.

[Kodename47]

Originally Posted by Toyota86.ir

In my mind the load is the force needed to rotate the wheels in a specific rpm , it means the load increase when the car weight increase or when the car goes to uphill.

Re-read what I said. Loading the engine and the load calculations for the engine are different. I explained what load means as far as the columns mean in the tables. It's not what you said.

[Toyota86.ir]

Originally Posted by Kodename47

Re-read what I said. Loading the engine and the load calculations for the engine are different. I explained what load means as far as the columns mean in the tables. It's not what you said.

Ok
You mean the load (higher/lower FD) has no effect on ecu.

[steve99]

Originally Posted by Toyota86.ir

Ok
You mean the load (higher/lower FD) has no effect on ecu.

no real difference to ecu it will sort it out its like driving in 4th as opposed to 5th..

see here re load calculation

http://www.romraider.com/forum/viewtopic.php?t=615

http://www.romraider.com/forum/viewt...hp?f=15&t=8218

[Toyota86.ir]

Originally Posted by steve99

no real difference to ecu it will sort it out its like driving in 4th as opposed to 5th..

see here re load calculation

http://www.romraider.com/forum/viewtopic.php?t=615

http://www.romraider.com/forum/viewt...hp?f=15&t=8218

http://www.romraider.com/forum/viewt...hp?f=15&t=8218
Thank you , very good link

[KoolBRZ]

With an AT, torque is needed to pull away from a stop. An MT can just rev and slip the clutch, but an AT has to have the torque to pull away without bogging. When you switch to a FD that is easier on the engine, you can tune for higher revving with less torque down low, since you don't need as much torque now. You are right that a different tune can get more out of the car after a FD swap. You could change your requested torque B table to use an MT table and get a more linear throttle response. You can shift the torque needed at launch to higher up in the mid-range with the right tuning.

[Toyota86.ir]

Originally Posted by KoolBRZ

With an AT, torque is needed to pull away from a stop. An MT can just rev and slip the clutch, but an AT has to have the torque to pull away without bogging. When you switch to a FD that is easier on the engine, you can tune for higher revving with less torque down low, since you don't need as much torque now. You are right that a different tune can get more out of the car after a FD swap. You could change your requested torque B table to use an MT table and get a more linear throttle response. You can shift the torque needed at launch to higher up in the mid-range with the right tuning.

good news if it's possible to shift the power to higher rev.

do tuners shift power band with cam tuning ?

[mrk1]

I have swapped my FD numerous times with no mention to the tuner, only need would be for the gear display and I never use it.

[KoolBRZ]

Originally Posted by Toyota86.ir

good news if it's possible to shift the power to higher rev.

do tuners shift power band with cam tuning ?

Looks like you'll have to talk to Mike the tuner about that. AT's do need more torque at launch than MT's, so the electric throttle mapping is different than the MT's.

[Scott@HKSUSA]

Originally Posted by Toyota86.ir

good news if it's possible to shift the power to higher rev.

do tuners shift power band with cam tuning ?

Tuners could. But I have no idea what most "tuners" do.

Variable cam timing allows one to control overlap. More or less overlap can move your peaks a little to the right or left, depending on what you're trying to achieve. But the cams themselves are the ultimate deciding factor for powerband rpm.

[Toyota86.ir]

Originally Posted by KoolBRZ

Looks like you'll have to talk to Mike the tuner about that. AT's do need more torque at launch than MT's, so the electric throttle mapping is different than the MT's.

yes i will send an email to Mike.
Mike is great , he is so busy these days.

i will do that .