Throttle MOD

[mielefan]

I have heard talk about a $300 throttle MOD--evidently eliminates the slight turbo lag--anyone know the availability and who makes it? Available at the dealer?

[mistermojorizin]

here you go dude: 270 shipped from hong kong http://www.1addicts.com/forums/showt...ghlight=sprint

[Mad Dragon]

it doesn't do a thing for lag. all it does is make the throttle more sensitive. wot is still wot.

[BMW135iCA]

I think he wants to know if it eliminates the throttle lag that has developed in the new software 29.2. Anyone who has experience with that show chime in with their experience and let this guy know. I am also curious.

Chris

[dmboone25]

Originally Posted by BMW135iCA

I think he wants to know if it eliminates the throttle lag that has developed in the new software 29.2. Anyone who has experience with that show chime in with their experience and let this guy know. I am also curious.

Chris

+1

[jeremyc74]

Originally Posted by BMW135iCA

I think he wants to know if it eliminates the throttle lag that has developed in the new software 29.2. Anyone who has experience with that show chime in with their experience and let this guy know. I am also curious.

Chris

The only thing that will eliminate the lag from the new software is a change in the software.

There was a post from one of the tuners here a little while ago explaining where the lag comes from. The jist of it is they're leaving the bypass open at low RPM on the newer cars, where it used to stay closed. Before the boost came on faster because the bypass didn't have to close when you stepped on the gas. Now there's a delay. It seems leaving it closed caused it to rattle or something like that.

[stovesax08]

So I'm a little confused, I have noticed with my manual 135i that there is a slight delay between me pushing the pedal down and the car actually starting to go faster. I only notice this while in gear, though, I'm guessing because I can't noice it while not having the clutch fully engaged. I have also noticed the same thing with our auto 2007 335xi. is this the throttle lag that is being discussed? (If it is then I am very interested in a solution, it is very annoying in slowly moving traffic)

[BMW135iCA]

Yeah lets hope that BMW fixes this problem.

Chris

[E82tt6]

Originally Posted by stovesax08

So I'm a little confused, I have noticed with my manual 135i that there is a slight delay between me pushing the pedal down and the car actually starting to go faster. I only notice this while in gear, though, I'm guessing because I can't noice it while not having the clutch fully engaged. I have also noticed the same thing with our auto 2007 335xi. is this the throttle lag that is being discussed? (If it is then I am very interested in a solution, it is very annoying in slowly moving traffic)

That is Turbo Lag. It will happen in any turbocharged car.

Sprint Booster, or any other throttle-shortener, will have NO effect on this. ALL it does is shorten the length of throttle travel. It has no effect on WG duty cycles, or anything else that might impact turbo lag.

[avus]

the sprintbooster mod is for throttle lag
from what i've researched and have been told by my SA -- this specific lag is common in all 135i, equipped with manual trans, regardless of software update
some just notice more than others

i have ordered mine to alleviate the prevalent lag in stop-and-go city driving

[RiXst3r]

I said this before... but I think a lot of people missed it...

The additional turbo lag is caused by the changes the bmw made to the wastegate duty cycle at low engine loads, or cruise, idle to address wastegate rattling.

Basically when the N54 was released, several tuners noticed that the wastegates on this car were normally CLOSED, meaning that as soon as you hit the gas, you were already spinning the turbines. This made turbo lag very very small... much less than most turbo cars, and so minimal that many people wouold say it was gone.

BMW made a change in the march 2008 software to address the issue with rattling or failing wastegates, so now the wastegate stays open, and has to close first before boost can build... this is the lag. The wastegate being open also causes the car to sound louder, and more "burbley" at idle/cruise...

I am flat out refusing all software updates of any kind until this issue is resolved. It IS a real issue, and there have been hundreds of complaints. Some dealers have even removed the new software from their computers because of complaints.

As others have said, these devices cannot remove turbo lag... all they do is give you a virtual heavy foot

[jeremyc74]

^^ This is the post I was talking about earlier. I'd say that's the most informed answer that has been given, and ought to be a sticky.

[adc]

All this being said, I have to remark that the throttle mapping in the 135i is different than the mapping in the 335i. Namely, the 135i mapping is more sensitive (aggressive) over the initial part of the throttle travel - almost like having this mod already installed.

This is different from the issue of additional lag via new SW. It was observed by me in separate 135i/335i back-to-back tests.

[m3gtrdtm]

I'm pretty upset about this wastegate issue. I've been thinking about a way to get around it for awhile. I'm guessing the wastegates on these turbos are internal, spring loaded, and have some type of boost control modulated by the ecu that affects when they open. I'd imagine in theory it wouldn't be too difficult to bypass the factory boost control for a simple manual boost controller (ball valve type or similar), that would insure the wastegates stay closed when they are supposed to. Then just set the mbc at stock boost pressure. It would be pretty easy to take on and off and undetectable after removed.

[E82tt6]

SSTT or JB1 are simple boost controlers. An MBC would not work on the N54.

Piggybacks that directly run the solenoids, or flashes will reduce lag.

[Brandon26pdx]

Originally Posted by m3gtrdtm

I'm pretty upset about this wastegate issue. I've been thinking about a way to get around it for awhile. I'm guessing the wastegates on these turbos are internal, spring loaded, and have some type of boost control modulated by the ecu that affects when they open. I'd imagine in theory it wouldn't be too difficult to bypass the factory boost control for a simple manual boost controller (ball valve type or similar), that would insure the wastegates stay closed when they are supposed to. Then just set the mbc at stock boost pressure. It would be pretty easy to take on and off and undetectable after removed.

I don't think that's the way it works with these newer turbo engines. The wastegates are full electronic control in your car...old school ball/spring MBC's are designed for turbo systems with wastegates that were set to open and close based on simple boost/vacuum inputs to the WG actuator. Modifing the WG behaivor was easy in those older cars. With a newer engine like the N54, software modification is the way it has to be done I believe.:iono:

[Mad Dragon]

This scientific chart explains what happens when you install the plug-in thingie© in your car.

[atr_hugo]

Mad Dragon - that's PERFECT!!

[E82tt6]

ROFL!

[Red135]

[F0Bman]

yeah not sure if I'm fully convinced of this.

[JBurer]

Picked mine up in April in Munich and noticed the lag was slightly more than I remembered when I drove the 335i about a year ago.

Since I have the newer ECU, is there any way to have the older software uploaded?

Does anyone know if the Dinan flash corrects for this?

Originally Posted by RiXst3r

I said this before... but I think a lot of people missed it...

The additional turbo lag is caused by the changes the bmw made to the wastegate duty cycle at low engine loads, or cruise, idle to address wastegate rattling.

Basically when the N54 was released, several tuners noticed that the wastegates on this car were normally CLOSED, meaning that as soon as you hit the gas, you were already spinning the turbines. This made turbo lag very very small... much less than most turbo cars, and so minimal that many people wouold say it was gone.

BMW made a change in the march 2008 software to address the issue with rattling or failing wastegates, so now the wastegate stays open, and has to close first before boost can build... this is the lag. The wastegate being open also causes the car to sound louder, and more "burbley" at idle/cruise...

I am flat out refusing all software updates of any kind until this issue is resolved. It IS a real issue, and there have been hundreds of complaints. Some dealers have even removed the new software from their computers because of complaints.

As others have said, these devices cannot remove turbo lag... all they do is give you a virtual heavy foot