Just installed Sprint Booster!

[bawareca]

Interesting. The pedal sensor is just a dual sensor (for redundancy). One is sending 0-5v and the other 5-0v. There is not even physical kick-down switch. What could this emulator possibly do to speed-up the throttle response except send a full throttle signal when you only press the pedal partially?
As a matter of fact I am annoyed of my X5D transmission downshifting too much, especially at lower gears. If I even find a way to re-program it to keep higher gear I would do that in a heartbeat.

[London Lad]

Originally Posted by bawareca

Interesting. The pedal sensor is just a dual sensor (for redundancy). One is sending 0-5v and the other 5-0v. There is not even physical kick-down switch. What could this emulator possibly do to speed-up the throttle response except send a full throttle signal when you only press the pedal partially?
As a matter of fact I am annoyed of my X5D transmission downshifting too much, especially at lower gears. If I even find a way to re-program it to keep higher gear I would do that in a heartbeat.

Nothing!

[ninja_zx11]

This is what I found about Sprint booster but never tried it myself.Don't know if it will be harder on engine/transmission?
A sprint booster increases the rate of change of voltage vs pedal position. So for a given increase in pedal position, the sprint booster yields a larger increase in voltage compared to when stock. It fools the engine management into thinking you are pushing the pedal harder.

To me it looks like that you are just saving your foot effort to reach that throttle position.

[bawareca]

Exactly! Also the DME/DDE may also adapt to more agressive driving and speed-up the response a bit.
Everyone has a different taste, but I will be unbeliveably annoyed if i have this thing installed in my car due to the frequent and unnecessary downshifts happening every time I press the gas.

[seattle]

Originally Posted by Ozer

I turn it off and floor it, it takes good 2-3 seconds before it downshifts and starts going.

Originally Posted by ninja_zx11

To me it looks like that you are just saving your foot effort to reach that throttle position.

Take this scenario, where lag drives me nuts: At freeway speed, do mildly hard slow down, as if traffic stopped ahead. Then, without stopping (at maybe 25mp), stomp on the pedal, as if you want to change to an open lane, and need to accelerate fast because traffic is approaching fast on that lane.

In my case, there is this 2-second lag, as if transmission is hunting for a gear. Then, because a low gear is chosen, RPMs shoot to near-max, and acceleration turns out meh.

Even on left-hand turns, I often find myself abandoning the idea to quickly turn when a gap opens, because I know there is this ridiculous lag when stomping on accelerator from complete still. I don't want to get T-boned.

If OP is suggesting that with Sprint Booster, acceleration is instant after pressing on pedal, it is then not the same as simply mashing your foot. In my cases, it does not matter how hard and far the accelerator pedal is pressed. The lag is always there.

So, does sprint booster take care of those 2 scenarios?

[bawareca]

DDE, and EGS, adapt to the driving style. It is possible that when always "stomping" signal is sent from the gas pedal sensor they are always on a highest aggressive settings. BUT, this will lead to even more downshifting and even more lag at crawling speeds.
In this situations using partial throttle has better results for me than stomping on it.
The best way to take off quickly from standstill is to do some boost braking. I use to hit the brake and raise the RPM to 1000-1200 and then it takes off like quicker than one might think.

[seattle]

Originally Posted by bawareca

The best way to take off quickly from standstill is to do some boost braking. I use to hit the brake and raise the RPM to 1000-1200 and then it takes off like quicker than one might think.

That is what I do sometimes, but still, no one can explain the hesitation. None of my previous vehicle had it.

Let's see what OP says about my scenario.

[London Lad]

SB can't do anything your foot can't.

Think about it, its a passive device, all it can do is 'send' say, full throttle when you are actually at half throttle.

[bawareca]

Originally Posted by seattle

That is what I do sometimes, but still, no one can explain the hesitation. None of my previous vehicle had it.

Let's see what OP says about my scenario.

I have explained this before. When the diesel revs high on 1st gear there is no load, turbos dont spool and there is no boost. The boost actually appears sometimes in 2nd gear when the engine starts to load. X5's reaction to a sudden gas pedal stomp is even worse. When the required torque(gas pedal position) is less than the available torque (RPM and boost dependant) it unlocks the torque converter, making the engine to rev even higher It is even more annoying with a trailer, the engine revs on first gear, but there is no torque available, the car doesnt accelerate and the computer waits for the redline to upshift.
A real flash tune may help a bit, because there is more available torque at any given time and it makes the computer less prone to downshift. With a piggyback there is more torque available too, but the computer doesnt know this fact and acts like normal.

[Ozer]

I will try your scenario today and report back.