questions about tuning with tweecer 93 ATX

[jruppert]

I already have a tweecer rt that I use with my 94 Mustang GT. The car is been put away for the winter and I thought about pulling out the tweecer and putting it in my girlfriends 93 SHO ATX w/ 130k miles. This car i bone stock. Would I see any benefits in tuning with a stock SHO? I have enough a decent amount of knowledge with the tweecer from my mustang after installing a stroker, heads, etc. I am just wondering if it is a waste of time to do this. Anyone have any opinions? Also, are there any things I should know about as to what not to mess with? As I said, it is an ATX and I thought about messing with the shift points etc but I dont want to screw up the tranny if they are problematic with mods. Thanks

 

[somedude_001]

from personal exp you can make a HUGE difference in shifting

edit: check out this thread http://www.shoforum.com/showthread.php?t=50682

 

[jruppert]

thanks for the link

 

[somedude_001]

i'm sure you read through the link but only thing that was modified was the transmission end of things no changes were made to the engine except for the 7K revlimiter, install this program ASAP because you will have a shit-eating grin on your face the first time you wind out first gear

 

[Axianator]

i'm sure you read through the link but only thing that was modified was the transmission end of things no changes were made to the engine except for the 7K revlimiter, install this program ASAP because you will have a shit-eating grin on your face the first time you wind out first gear

FYI - while Alex's original calibration file may have only contained transmission-related changes to the code, there were several modifications to other areas of the code contained in the calibration file that I provided for him later in that thread. That said, I would advise against using his TV adder values right out-of-the-box since it is very unlikely that a stock Gen 2 ATX will be happy with the amount of line pressure that is commanded with the values he provided.

If you have any ATX-specific Q's, feel free to post them or shoot me a PM.

 

[jruppert]

Well at the moment I am just considering the idea. I have my tweecer installed in the mustang had my wires hidden into the dash. I would have to remove everything and that is why I was debating on whether or not to do this. I am not just interested in shift points though. This is a daily driver and I would hate to F things up. I dont mind tinkering around with it though but would like to do things on the safe side. I have noticed in her car that when you run 1st out and it finally shifts it feels like the torque converter grabs then slips then finally grabs into 2nd. Is this normal? She hasnt had the car for more then 3 months.

 

[somedude_001]

I have noticed in her car that when you run 1st out and it finally shifts it feels like the torque converter grabs then slips then finally grabs into 2nd. Is this normal? She hasnt had the car for more then 3 months.

no that isn't normal but it seems as though quite a few people have that problem, I have a theory on why it does that but i'm not expierenced enough to say anything.

FYI - while Alex's original calibration file may have only contained transmission-related changes to the code, there were several modifications to other areas of the code contained in the calibration file that I provided for him later in that thread. .

are you trying to say I don't know what i'm doing... well you right (just messing with you) I wasn't clear I would definately reccomend using Axianator's file I thought I expressed that in the thread but I may not have.

That said, I would advise against using his TV adder values right out-of-the-box since it is very unlikely that a stock Gen 2 ATX will be happy with the amount of line pressure that is commanded with the values he provided

believe it or not the shift was very firm with the high TV value rember the one I use was set at 22 I sent you one of the files we were testing with a long time ago which was 44 and at 44 it caused a shudder dutting the 1-2 shift. but maby this contrubuted to my pump failure? the female side on the pump is completely stripped out.

 

[jruppert]

it almost feels like a shudder while in wot between 1st and 2nd. maybe i am just feeling the tires slip?

 

[somedude_001]

maybe i am just feeling the tires slip?

I doubt that

your tranny has a nice proper 1 2 shift and then once in second it releases for a second and then clamps back down. that is what mine and one other person on superhighoutput does well mine did that before I blew it up but it did that for 20K of its 30K life and I drive mine very hard.

 

[Axianator]

I am not just interested in shift points though. This is a daily driver and I would hate to F things up. I dont mind tinkering around with it though but would like to do things on the safe side.

As I told Alex in his thread, the key here is "slow and easy".

I have noticed in her car that when you run 1st out and it finally shifts it feels like the torque converter grabs then slips then finally grabs into 2nd. Is this normal? She hasnt had the car for more then 3 months.

Unfortunately, this kind of shifting behavior (which can often be an indicator of developing internal problems elsewhere) is not normal for a "healthy" ATX. Also, given the fact that the tranny in quesiton is a '93 and is likely a factory original unit, there could be several reasons as to why you're experiencing the behavior that you mentioned.

As for the Gen 2 ATX factory converter strategy:

- third and fourth are the only gears where converter lock is commanded
- third is the only gear where converter slippage is commanded

are you trying to say I don't know what i'm doing... well you right (just messing with you) I wasn't clear I would definately reccomend using Axianator's file I thought I expressed that in the thread but I may not have.

LOL - my bad for the misunderstanding.

believe it or not the shift was very firm with the high TV value rember the one I use was set at 22 I sent you one of the files we were testing with a long time ago which was 44 and at 44 it caused a shudder dutting the 1-2 shift. but maby this contrubuted to my pump failure? the female side on the pump is completely stripped out.

Yep - Ted typically uses a value of 25 at WOT in the TV Adder 1-2 function of most of his "standard issue" ATX LPM programs (further research has shown that a healthy stock ATX will usually respond well within a few units +/- of this value). Something else of note regarding line pressure tuning are the values that I modified in the Engine Torque table (which effects the amount of constant line pressure commanded via the EPC solenoid at all times) - by ramping the high load/high RPM values in this table up to a safe level, you can help to reduce the initial shock on the drivetrain by closing the gap in line pressure that the tranny sees between shifting events.