If you put different gears in your car and have your tuner reprogramed for the gears then your factory settings will not be setup for the new gear ratio. I have the SCT Xcalibrator 1 and there is no adjustment for the gears so I am sending it back to Brenspeed to change the tunes for the 4:10 gears.

If I ever want to load the factory tune back in the car it won't know that I swapped gears and the speedmeter will be wrong and who knows what else. This may not be true with the SCT II or the Diablo tuners but it is with the XCal 1! :bang:

Am I driving everyone crazy with the gear questions yet? I just don't want to leap into something that causes me lots of problems and folks here are helpful and knowledgable.

 

I would have assumed there would have been a setting in there that takes your gear settings, I do on my Diablo, I can't imagine SCT leaving out that big one :scratch:

 

Sorry if this has already been answred before, but My Xcal 2 should finally be here on monday from MD motorsports. It has a custom tune for my Airaid CAI. I just came into some money and found a local shop that will install gears for a fairly reasonable price. The way the SCT ads make it sound it is user adjustable for gears, tires etc. Can I just change it, or do I have to send the tuner back to MD for another tune change?

 

You most definately should be able to change the gear ratio, along with the tires actual diameter. I have heard of problems with adjusting custom tunes though, usually a modification from the tuner fixes it though.

 

Remember I have the first generation XCal black box.

 

[quote=GRAYPNY,January 5, 2006, 6:10 PM]
If you put different gears in your car and have your tuner reprogramed for the gears then your factory settings will not be setup for the new gear ratio. I have the SCT Xcalibrator 1 and there is no adjustment for the gears so I am sending it back to Brenspeed to change the tunes for the 4:10 gears.

If I ever want to load the factory tune back in the car it won't know that I swapped gears and the speedmeter will be wrong and who knows what else. This may not be true with the SCT II or the Diablo tuners but it is with the XCal 1! :bang:

Any tune you have will have to be adjusted to accomodate the new gears, not just the "stock" tune.



Paul

 

You should consider having brenspeed making a copy of your original/factory tune and then making the adjustment for the 4.10's. That way you have a completely stock tune with the exception of the rear 4.10 gear.

 

Whoops! :bang:

 

Can't Brent change all your tunes while he has the X-cal1? You said you were shipping the unit to him, correct?

 

You're not driving me crazy, in fact that a good point. I'm reading a sct users manual and it makes no mention of being able to alter the factory tune parameters. I just bought frpp 4:10's last week and have been trying to make up my mind on whether to buy a sct, predator, or just have Ford flash my pcm for the gear ratio change. Other than wanting a tuner flash to help improve the "throttle by wire" response, I have no other need for a tuner. The only mods I'll be making is an "AirHog" oem style air filter and the 4:10 gears.

 

When I first looked into 4.10's I talked with a dealer who told me they can not install that ratio for me because they would have to reflash the computer.......which would (change the factory settings) and be illegal due to EPA.
Tried a second dealer and they told me the same same.

 

I am going to have Brent do 3 tunes.

1. stock tune with 4:10
2. 91 tune w/4:10
3. 91 tune w/stock gears

I will pretty much have my bases covered by doing this because maybe I won't even put in the 4:10 gears and I'll still be OK.

 

This is a great question. Can the rear gear and tire size be changed in the SCTX-2 by the owner or must you ask your tuner to E mail you a change to his tune?
For those that already have the SCT can you change the stock tune for tire and gear change? Thanks

 

I can change my axle ratio, tire diameter, cooling fan temps, ect. with my Diablosport Predator by myself.

Can X-CAL II owners change their axle ratios,tire diameters, cooling fan temps, ect. by themselves or do they need to send their tunes out to get modified?
From what I understand the tunes can be locked by the person who wrote them.
What happens if the person who wrote the tune gets run over by a bus?
If this is in fact the case it's a big minus for the X-CAL II

As far as the dealer is concerned tell your dealer he's full of it.

Direct from the Ford Mustang Factory Service Manual.

Powertrain Control Module - Vehicle Speed Output (PCM-VSO)
The PCM-VSO speed signal subsystem generates vehicle speed information for distribution to the vehicle's electrical/electronic modules and subsystems that require vehicle speed data. This subsystem senses the transmission output shaft speed with a sensor. The data is processed by the PCM and distributed as a hard-wired signal or as a message on the vehicle communication network (SCP or high speed-CAN).

The key features of the PCM-VSO system are to:

infer vehicle movement from the output shaft speed (OSS) sensor signal.
convert transmission output shaft rotational information to vehicle speed information.
compensate for tire size and axle ratio with a programmed calibration variable.
use a transfer case sensor for four wheel drive applications.
distribute vehicle speed information as a multiplexed message and/or an analog signal.
The signal from a non-contact shaft sensor (output shaft sensor [OSS] or transfer case shaft sensor [TCSS]) mounted on the transmission (automatic, manual, or 4WD transfer case) is sensed directly by the PCM. The PCM converts the OSS or TCSS information to 8000 pulses per mile, based on a tire and axle ratio conversion factor. This conversion factor is programmed into the PCM at the time the vehicle is assembled and can be reprogrammed in the field for servicing changes in the tire size and axle ratio. The PCM transmits the computed vehicle speed and distance traveled information to all the vehicle speed signal users on the vehicle. VSO information can be transmitted by a hard-wired interface between the vehicle speed signal user and the PCM, or by a speed and odometer data message through the vehicle communication network data link.

The PCM VSO hard-wired signal wave form is a DC square wave with a voltage level of 0 to VBAT. Typical output operating range is 1.3808 Hz per 1 km/h (2.22 Hz per mph).

 

Yes, with the X2, you can change the gear and tire ratio yourself, assuming that the tune that you're working with isn't locked. For example, I have two tunes from two different tuners; one is locked, the other isn't. So, I can get in an change parameters on the unlocked one, but not the locked one. Confused yet??

And no, you can't change the stock tune. I don't believe that any aftermarket tuner can change the actual factory tune.

Thanks.

 

In the Diablosport Predator there is an 87 octane tune which has the stock parameters so you can change your gear ratios, tire diameters, or whatever else you want to change.

 

But it's not the stock Ford parameters, is it? Why would they send a tuner loaded with a stock, factory tune? I can understand having a tuner with a preset 87 octane tune; the Predator that I had previously for an '04 Mach had one. But, it wasn't a stock Ford tune, it was a performance tune for 87 octane that came with the unit.

 

The X-1 can be used to change gear ratio's but you have to have the tune file to do it using the Extreme Tuning software and then you have to have the special programming cable to upload it to the X-1.

Now something that hasn't been taken into acount for with the 05's is that the only change that either the X-2 and X-1 do with the end user changes is the speedo corrections. With the new Drive-By-Wire systems you have to make a change to the throttle settings as well or else you will go into fail safe mode. These parameter changes can't be done by the end user.

What can be done is a change made by your SCT dealer and then emailed to you for you to upload into your X-2 or X-1 for that matter. I've done this for numerous customers now as I always tell them to just let me know if they ever change gears and I'll gladly make the adjustments for them and email them the new file.

You can't make any changes to the stock file, nor can I.

THanks, Doug.

P.S. I dont know anything about the Diablo.

 

The man has spoken....
Thanks Doug!!

 

Direct quote from the Diablosport Predator Manual

"Factory Hp Tune is a adjustable factory tune with NO
performance tuning."

This is a good reason for tuners to choose X-CAL II because there is more money in it for them.

I agree that there are more adjustments for the automatics with the X-CAL II but for my manual trans I'll keep the predator. I can make any adjustment i choose. from idle adjustments to timing to fuel to tire diameter and axle ratios.