What is a re-flash? - Ford Mustang Forum
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post #1 of 18 (permalink) Old 03-20-2005 Thread Starter
 
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What is a re-flash?

Can someone tell me what a re-flash is and why you would have to have it done? Thanks!

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post #2 of 18 (permalink) Old 03-20-2005
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Hey 05BlackV6, reflashing the computer is needed when adding mods to your motor. Actually, some folks are reporting gains when reflashing the computer without adding any mods. Ford loaded a safe tune in the car but with minor tweaking 5-10hp is pretty easy on the stock car.

For instance, when adding a cold air intake (which flows more air into the motor) it is important to adjust the Air/Fuel ratio because with all the extra air flowing in the motor, would run lean. Lean meaning more air then fuel and Rich meaning more fuel than air.

Reflashing is accomplished by using haldheld programmers like the SCT Xcalibrator and Diablo Predator. Most mod websites can sell you there mods and one of the reflashing units with tunes preloaded. So all you have to do is throw on the mods, hook up the programmer to your OBD II port (under dash/steering wheel) and load the program. Hope this helps!

Adam

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post #3 of 18 (permalink) Old 03-21-2005
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Good answer Adam

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post #4 of 18 (permalink) Old 03-21-2005
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Reflashing

What happens if all you do is disconnect the battery cable for 30 minutes to make it "relearn?" Will this improve things? I assume the programming parameters stay the same, but will making the computer "relearn" help in any situations?

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post #5 of 18 (permalink) Old 03-21-2005
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Quote:
Originally Posted by wnewport
What happens if all you do is disconnect the battery cable for 30 minutes to make it "relearn?" Will this improve things? I assume the programming parameters stay the same, but will making the computer "relearn" help in any situations?
It will not improve performance, just re-learn throttle positision, shift points, etc. If you are thinking that it will help, na

-Bryan

2005 Mustang GT - 520+rwhp
Built 3v w/ P&P heads & custom cams | ProCharger 13# Boost | JBA Cat4ward Shorties | Basanni X Pipe & Mufflers.
Automatic | 4:10 Gears
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Before built motor: 11.9 @ 116.99. Goal: 11.2-11.5 on built motor.

Built Motor by: Houston Performance | Tuned by: PSI Motorsports
Paint by: Chaotic Rods & Customs| Homepage: My Mustang Page
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post #6 of 18 (permalink) Old 03-21-2005
 
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Quote:
Originally Posted by wnewport
What happens if all you do is disconnect the battery cable for 30 minutes to make it "relearn?" Will this improve things? I assume the programming parameters stay the same, but will making the computer "relearn" help in any situations?
The engine control software has some adaptive mechanisms that monitor your vehicle performance continuously. It looks at things like atmospheric pressure and temperature and the various sensors on the vehicle. It calculates adjustment factors for zeroing sensors by cross checking them and also calibration factors for items like the electronic throttle and the fuel system. Manufacturing tolerances mean that all these types of components can vary slightly in their performance. They also change over time as they wear. All of these factors are saved non-volatile ram in the engine controller and used to adjust the engine control. This way the computer can maintain nominal performance, fuel efficiency and emmisions. Disconnecting the battery restores these to factory defaults. If you just keep driving the learning parameters will eventually adjust themselves to any changing conditions. None of this will provide you any significant increase in performance.

For performance increases you need to actually re-calibrate the software and change hard-coded values. For this you need some sort of programming tool and knowledge of what addresses to change and by how much.
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post #7 of 18 (permalink) Old 03-21-2005
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Ditto to Sam above. If you do choose to "Tune" or tweek the factory computer settings, use a good quality aftermarket tuner such as the DiabloSport Predator (DSP) or the SCT Xcalibrator. I recently used the DSP with the 86 Octane Performance tune. I saw a big difference in the overall performance and smoothness of the engine. I had a bit of valve train clatter that has virtually gone away. The 4.6 Modular engine has a lot of noise from the various components in the OHC design. I knew there was a bit of slop in the factory computer settings, but was amazed at the improvement the re-tune did for drivability. There is a bit of a lag in the electronic throttle (not as noticeable in the 5 spd Man though), but there is virtually none now. Overall, I would recommend doing this.

If you are going to make any performance modifications to your car, then you will have to re-tune the computer to account for these changes. This includes any intake mods like a cold air intake, charge motion control valve plates, etc or exhaust mods like headers, free flowing exhaust systems (Borla, JBA, Magnaflow, etc), etc. Before anyone shouts Waranty issues, talk to your dealer's Service Advisor as to your their policy on after market performance parts and computer tuners. My dealer has no issues with this and they have to prove it caused a problem with your car. There is a lot written on this throughout this forum, so research it before you do it and don't take our word totally on what you should or should not do since we are making a choice for ourselves to make more of our cars.

There are a lot of improvements you can make in the new Mustang, but research it out and read this and other forums to find out what others are doing. We can help you out, but research, research, research before you do anything to your car. Many of us do know a lot and are good sources of what to do and not to do. I for one know just enough to be dangerous! Aahhh..ha...ha...ha...haaaaa....

"Safety Fast"

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post #8 of 18 (permalink) Old 03-21-2005 Thread Starter
 
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Thanks for all of the information!
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post #9 of 18 (permalink) Old 03-22-2005
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I'm too tired to read all the text above but from what I read it's all correct! I wanted to add that if you ONLY change the after cats part on your exhaust the battery pole remove reset is fine. But the 20 engine HPs will be stuck in there. So, $400 for an axleback and 5 RWHPs or $400 for a tuner (and remove the intake tube filter for free) and get 15-20 RWHP... or do both for power (up to 30 RWHPs), economy, trottle reponse, better running, and awesome tunes... :hihi:

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SCT or Factory reflash

While at the Ford shop, I asked about the different tuners available. Since I am just adding the CAI and new axle back exhaust the guy said to just bring it in and for $40.00 he would flash it for me.

Is there any reason I need to own one, I am not going to keep adjusting it nor am I into racing on Friday nights and cruising on Sat. Just looking for a little better HP and sound.

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343.6 HP 320.5 Torque
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Quote:
Originally Posted by JLBeeler View Post
While at the Ford shop, I asked about the different tuners available. Since I am just adding the CAI and new axle back exhaust the guy said to just bring it in and for $40.00 he would flash it for me.

Is there any reason I need to own one, I am not going to keep adjusting it nor am I into racing on Friday nights and cruising on Sat. Just looking for a little better HP and sound.
If you don't plan on doing anything further with it, that would be fine..

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Quote:
Originally Posted by JLBeeler View Post
While at the Ford shop, I asked about the different tuners available. Since I am just adding the CAI and new axle back exhaust the guy said to just bring it in and for $40.00 he would flash it for me.

Is there any reason I need to own one, I am not going to keep adjusting it nor am I into racing on Friday nights and cruising on Sat. Just looking for a little better HP and sound.

No tune adjustment is required for new axle backs.

You state that you are adding a CAI, in this case you will need to have the car dyno'd to adjust the Mass Air Flow Transfer Function. Unless of coarse, the Ford shop already has the function values for the CAI you are installing then they just plug those values into the function table.

Anytime the air flow into the engine is change away from stock, the MAFT must be adjusted, if not you could find your engine running lean and CEL's will be displayed.

I would suggest that you purchase your CAI and Tuner (complete with custom tune) from one of the forum vendors. (about $600 - $800) not bad for a 25rwhp gain.

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Is this the Ford CAI that's being installed?

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Looking at the Steeda 90 MM CAI right now. Which I believe is part of the Ford Performance Package so they should have it.

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Quote:
Originally Posted by JLBeeler View Post
Looking at the Steeda 90 MM CAI right now. Which I believe is part of the Ford Performance Package so they should have it.
If Ford has a calibration for it, that'll work fine...


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