Free DIY mini sprint booster
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MBWorld Fanatic!
Joined: Sep 2008
Posts: 1,331
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From: Delaware
2004 Mazda6, 1993 RX7
DIY mini sprint booster
This would be most effective for atx models. Our 08 had learned some bad habbits and became sluggish, so this time I went to the "secrets thread" for a concept I had:
-----------------------------
10) Steps to Reset the TCU. Resetting the TCU will reset transmission to factory shift points and the car will 'relearn' your driving style.
(1.) Turn the ignition key to the on (not start) position.
(2.) Press the gas pedal to the floor and hold for five seconds.
(3.) Turn the key to the "off" position (don't remove the key), then release the gas pedal.
(4.) Wait at least two minutes for TCU to reset. (key in)
--------------------------------
I think this really just sets the range of the TB, so you get max signal voltage ( ~4.6V ) when pedal is floored, and is not mostly related to the TCU.
On our 08 atx, there is a false stop at about 80% pedal travel, and much more force is required to press the pedal further to the floor.
THE "MINI SPRINT BOOSTER" MOD:
I did the item 4 steps in secret #10 to reset the TB, but only pressed the pedal to the hard spot, instead of to the floor. And be sure to leave the key in during step (4) .
The results were great. Due to this method, at about 1" typical pedal stroke, you are telling the ecu and TCM that there is about 20% more load than before the mod. The benefits include:
-> higher shift points
-> quicker/easier to downshift
-> a more peppy drive with less lag
-> cost is $0
As far as 0-60 or 1/4 mile times, no improvement there.
I hope others with atx models try the same mod, to get more driver impressions.
.
-----------------------------
10) Steps to Reset the TCU. Resetting the TCU will reset transmission to factory shift points and the car will 'relearn' your driving style.
(1.) Turn the ignition key to the on (not start) position.
(2.) Press the gas pedal to the floor and hold for five seconds.
(3.) Turn the key to the "off" position (don't remove the key), then release the gas pedal.
(4.) Wait at least two minutes for TCU to reset. (key in)
--------------------------------
I think this really just sets the range of the TB, so you get max signal voltage ( ~4.6V ) when pedal is floored, and is not mostly related to the TCU.
On our 08 atx, there is a false stop at about 80% pedal travel, and much more force is required to press the pedal further to the floor.
THE "MINI SPRINT BOOSTER" MOD:
I did the item 4 steps in secret #10 to reset the TB, but only pressed the pedal to the hard spot, instead of to the floor. And be sure to leave the key in during step (4) .
The results were great. Due to this method, at about 1" typical pedal stroke, you are telling the ecu and TCM that there is about 20% more load than before the mod. The benefits include:
-> higher shift points
-> quicker/easier to downshift
-> a more peppy drive with less lag
-> cost is $0
As far as 0-60 or 1/4 mile times, no improvement there.
I hope others with atx models try the same mod, to get more driver impressions.
.
Last edited by kevink2; Aug 14, 2010 at 01:28 AM.
Thread Starter
MBWorld Fanatic!
Joined: Sep 2008
Posts: 1,331
Likes: 9
From: Delaware
2004 Mazda6, 1993 RX7
on pos'n is just one less click than the crank position. I think it's just 1 click, but verify it by just starting the car.
no confirmation, other than very spunky response. hard copy this:
my mod'd TCU reset:
(1.) Turn the ignition key to the on (not start) position.
(2.) Press the gas pedal to "stiff position" and hold for five seconds.
(3.) Turn the key to the "off" position (don't remove the key), then release the gas pedal.
(4.) Wait at least two minutes for TCU to reset. (key in)
.
no confirmation, other than very spunky response. hard copy this:
my mod'd TCU reset:
(1.) Turn the ignition key to the on (not start) position.
(2.) Press the gas pedal to "stiff position" and hold for five seconds.
(3.) Turn the key to the "off" position (don't remove the key), then release the gas pedal.
(4.) Wait at least two minutes for TCU to reset. (key in)
.
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MBWorld Fanatic!
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C300 Sport/Palladium Silver on Black/P2
However, the poster had the clever idea of holding the pedal only to the resistance point (not engaging the kick down button).
No, you do not get a notification, although sometimes after the 2 minutes specified, you can hear the computing rumbling a bit, restarting.
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Thread Starter
MBWorld Fanatic!
Joined: Sep 2008
Posts: 1,331
Likes: 9
From: Delaware
2004 Mazda6, 1993 RX7
yup.
also, I recall reading in the owner's manual? that there is no longer any actual switch at the kickdown point, but MB retained the resistance point for some reason.
also, I recall reading in the owner's manual? that there is no longer any actual switch at the kickdown point, but MB retained the resistance point for some reason.
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C300 Sport/Palladium Silver on Black/P2
My SLK does not seem to have the definitive point like that, which you can physically feel. It's just smooth to the floor.
Last edited by mac911; Sep 4, 2010 at 01:35 AM.
Member
Joined: Apr 2010
Posts: 94
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From: Nassau County, NY
C300 4MATIC Sport
I did the normal ECU reset and it worked like a charm. I pressed the pedal down all the way to the floor. I literally pulled out of the driveway and floored it down the road and it drove like a different car - I was amazed.
I am interested to try this mod and see if it works better/same/worse. I will let everyone know!
I am interested to try this mod and see if it works better/same/worse. I will let everyone know!
MBWorld Fanatic!
Joined: Jan 2008
Posts: 1,321
Likes: 0
C300 Sport/Palladium Silver on Black/P2
I'm actually mad I reset it the other day.
The reason being is that over time I had done a lot of spirited driving and got the transmission behaving better.
Now, after the rest I've been more around town peaceful driving, so I think the transmission is slipping back to how I don't want it.
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Joined: Apr 2002
Posts: 22,058
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From: Diamond Bar, CA
W206 PHEV AMG
doesn't matter how far you press the pedal down. the TCU reset it's value to zero. it will re-learn your driving pattern in couple days.
the new pedal's kick-down button as said it doesn't work. It's only a spring loaded button. you can take it out if you want. it's just there to remind people that fully pressing the throttle will force down-shift.
the new pedal's kick-down button as said it doesn't work. It's only a spring loaded button. you can take it out if you want. it's just there to remind people that fully pressing the throttle will force down-shift.
Thread Starter
MBWorld Fanatic!
Joined: Sep 2008
Posts: 1,331
Likes: 9
From: Delaware
2004 Mazda6, 1993 RX7
doesn't matter how far you press the pedal down. the TCU reset it's value to zero. it will re-learn your driving pattern in couple days.
the new pedal's kick-down button as said it doesn't work. It's only a spring loaded button. you can take it out if you want. it's just there to remind people that fully pressing the throttle will force down-shift.
the new pedal's kick-down button as said it doesn't work. It's only a spring loaded button. you can take it out if you want. it's just there to remind people that fully pressing the throttle will force down-shift.
---------
Thanks for the people that tried this mod .... seems like most people liked it.
Last edited by kevink2; Oct 1, 2010 at 01:00 AM.
Member
Joined: Jan 2016
Posts: 75
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From: Las Vegas, NV USA
2014 C300 4matic Sport Avantgarde
I did the reset last night and did about 20 mins. of spirited driving. So it's going to take a few days then. Say 50 miles or so of driving? So this weekend I need to drive it like I stole it ? Ok will do. Thanks for the great advice.
Really tho it does feel better and will likely do this reset every few weeks or so. I come from 2 previous 335i's so my foot is in the pedal most of the time as I'm used to that extra hp and kinda have to lean in to it with this car to get close to the acceleration I used to get.
