87/89/91 (Full Version)

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87/89/91

  

Smgfan1224 -> 87/89/91 (1/22/2008 1:35:02 PM)

would it be possible to get the break down of each tune 87/89/91.  Also the difference between the performance and milage. if possible?

  
Justin00Stang -> RE: 87/89/91 (1/23/2008 6:07:56 AM)

Hi, I'll try to answer that, but it would be better if I knew what car and what mods.

All the tunes are similar in the respect that they optimize the calibration for overall driveability, throttle response, raise rev limiter slightly, remove speed limiter, get rid of torque truncation in 1st gear on 4.0Ls, optimize torque reduction on autos, firm up shifts on autos, change shift/lock points on autos, and the A/F ratio is optimized at WOT. 

The 87 tune does not result in a ton of power, but you still get all the benefits above.  On 89 we can run a little more timing and get a little more power.  Premium fuel (91-93) is going to get you the most power and torque due to the ability to run more timing.

The mileage tunes increase fuel economy while cruising, with no loss in wot power.  Some may notice a little bit of reduced part throttle power with the mileage tunes.

For example, on an automatic 4.0L I optimize the shift/lock schedule, so even with a 93 perf tune you will pick up a slight amount of mileage due to the improved efficiency through the trans.

Smgfan1224 -> RE: 87/89/91 (1/23/2008 10:24:17 PM)

oh haha 07 v6 mustang with mrt exhaust  so far..

Justin00Stang -> RE: 87/89/91 (1/24/2008 6:19:59 AM)

The 4.0L picks up a ton of MPG with my tunes, some have reported 3-4mpg increase on the highway. 

With our intake and tune package, you'll see about 15RWHP and 10RWTQ gain.

Smgfan1224 -> RE: 87/89/91 (1/24/2008 1:32:12 PM)

since mine is a manual, there would be no need for for firm shifts and lock points correct?

Justin00Stang -> RE: 87/89/91 (1/24/2008 6:35:09 PM)


right

quote:

ORIGINAL: Smgfan1224

since mine is a manual, there would be no need for for firm shifts and lock points correct?

Frank Bullitt -> RE: 87/89/91 (4/18/2008 10:50:35 AM)

quote:

ORIGINAL: Justin00Stang

Hi, I'll try to answer that, but it would be better if I knew what car and what mods.

All the tunes are similar in the respect that they optimize the calibration for overall driveability, throttle response, raise rev limiter slightly, remove speed limiter, get rid of torque truncation in 1st gear on 4.0Ls, optimize torque reduction on autos, firm up shifts on autos, change shift/lock points on autos, and the A/F ratio is optimized at WOT. 

The 87 tune does not result in a ton of power, but you still get all the benefits above.  On 89 we can run a little more timing and get a little more power.  Premium fuel (91-93) is going to get you the most power and torque due to the ability to run more timing.

The mileage tunes increase fuel economy while cruising, with no loss in wot power.  Some may notice a little bit of reduced part throttle power with the mileage tunes.

For example, on an automatic 4.0L I optimize the shift/lock schedule, so even with a 93 perf tune you will pick up a slight amount of mileage due to the improved efficiency through the trans.



I am curious about what "torque truncation" in first gear refers to.  And does this apply to a 2007 4.0 manual transmission - or just automatics ?

Thanks

Justin00Stang -> RE: 87/89/91 (4/23/2008 4:59:50 AM)

Torque is limited by the PCM in 1st gear to keep the 7.5 axle from seeing too much torque.  Just manuals.

Frank Bullitt -> RE: 87/89/91 (4/24/2008 6:24:26 PM)

quote:

ORIGINAL: Justin00Stang

Torque is limited by the PCM in 1st gear to keep the 7.5 axle from seeing too much torque.  Just manuals.


Other than with some real abusive driving would turning off the torque truncation cause any problems for the 7.5 axle ?

Sometimes my mustang seems to want to buck or stall when taking off from dead stop.  Seems to maybe be a little worse after getting off the freeway or in stop and go traffic.  Never had this problem with my 1999 Ranger or other manual transmission vehicles.

I wonder if maybe torque truncation could have something to do with this ?

Justin00Stang -> RE: 87/89/91 (4/24/2008 7:47:50 PM)

Probably just the really steep 1st gear.

  

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