93 Bama Race Tune - Car Jolts/Jerks - Mustang Evolution

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Old 03-19-2013, 10:31 PM   #1
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Exclamation 93 Bama Race Tune - Car Jolts/Jerks

Today my bama tuner arrived loaded with the 3 tunes for my car. I got my front brake pads and rotors changed, along with a syntheic oil change today. Anyway, I programed the 93 Octane race tune into my car. (Ive been running 93 for a few weeks now).

Anyway, you know how when you punch the gas very hard your car will sorta jolt as you rapidly accelerate? Well the same thing also happens in the opposite direction when i completely let go of the gas after accelerating quickly.

I might be crazy, it might have to do something with the brakes, idk. Is this normal, or is something wrong? I am always flying down the roads to work and college, so i know i would have noticed this before as I smash the throttle and let go very often.

Any help is much appreciated. Also, I love the tune, my engine is all stock (99 GT) and just with the race tune it is much faster already.
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Old 03-20-2013, 02:29 AM   #2
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Mine jerks when I shut the throttle down, but only if I'm in first or second; that's normal for a manual. It comes from the sudden drop off of torque from the motor being forced against the momentum of the car pushing forward and rotating the wheels. It's just a jerk from strain on the rotating assembly.
I'm sure the tune exacerbated the effect.
If it happens after WOT and you shut it down, I'd guess it's fairly normal.
I'm no pro at tuning, so I'll let someone else give a definite answer.
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Old 03-20-2013, 10:25 AM   #3
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He's right. The tune is just going to make it more noticeable. It's just your cars drop in momentum. Nothing's wrong.
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Old 03-20-2013, 10:30 AM   #4
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My car is an automatic and it does it as well
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Old 03-20-2013, 11:01 AM   #5
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Buckeye80,

As these guys already mentioned, it sounds like you're experiencing a change in momentum. With the Race tune uploaded, you're accelerating faster than before, so when letting off the gas there's a more significant loss of momentum.

If you're trying to describe another symptom, please let me know. However, based on the feedback in your original post, I believe there's nothing wrong. Just the affects of going a little faster than before!

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Old 03-20-2013, 11:15 AM   #6
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In a manual that's normal because the transmission is braking (not breaking) the engine, you are pretty much going from acceleration to deceleration.
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Old 03-20-2013, 11:21 AM   #7
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Not trying to hijack the thread here but I have a stock 2000 gt auto would a tuner be worth getting?
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Old 03-20-2013, 11:57 AM   #8
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Quote:
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Not trying to hijack the thread here but I have a stock 2000 gt auto would a tuner be worth getting?
Yes. Very
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Old 03-20-2013, 12:09 PM   #9
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My car is an automatic and it does it as well
+1 but I don't have a tuner. Hoping there's no real problem though.
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Old 03-20-2013, 12:20 PM   #10
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+1 but I don't have a tuner. Hoping there's no real problem though.
Auto, manual, tiptronic, flappy paddle thingies, they all do it.
The tuner amplifies throttle response, meaning that pedal input and butterfly openings have more drastic effects on the air/fuel intakes. That just means that shutting it down at 2,500 feels a bit stronger than it used to because of the change.
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Old 03-20-2013, 11:02 PM   #11
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Thank you all for the responses, It makes sense know haha. As to the guy that asked if a tuner is worth it on a stock 2000 gt? My engine is all stock and I would say its definitely worth it.
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