Just installed Sprint Booster!

[Ozer]

Ok well i tried the suggested scenario on the highway while there were no cars behind me.
Going 60mph i did a hard stop till about 40 then stomped on the throttle while the SB was OFF. There was a delay and then RPMs went up and car sped up slowly, as one would expect.

Then i did the same with the SB ON in red and i didnt see much of a difference so i guess it doesnt really work in that scene.
Like it was said earlier, i believe it just sends a full throttle signal at slight throttle but i still like it for highway driving. There is something about just touching the throttle a bit and moving as you intend versus stomping on it and moving.

Im coming over from a 400hp 335i so im very used to power being there when i touch the throttle and x5d doesnt have that.

DISCLAIMER: My engine malfunction light is on, power reduced message is displayed because i have 3 codes i need to fix. Im not sure if that had anything to do with the test. Once i fix things i will try this scenario again and report back.

[bawareca]

It will either has no power(50hp) or the full power, except if there are serious problems and boost leak.
Mine X5D with the tune has some serious power, even though the transmission delay and downshift problems are untouched. Just need to adapt to the behavior. From a standstill with some brake boosting I did smoke 335i and Fiesta ST pretty badly. After 60 mph the power is there on tap.

[Ozer]

Its showing air intake temp and MAF. I changed the air intake temp and didnt solve the issue, trying to make sure the MAF is bad versus buying a new one to test it.

[seattle]

Originally Posted by Ozer

Its showing air intake temp and MAF. I changed the air intake temp and didnt solve the issue, trying to make sure the MAF is bad versus buying a new one to test it.

Wrong thread ?

[finnbmw]

In suburban and stop-and-go traffic, I run the transmission in DS. Helps with throttle response (due to higher RPMs) and gets rid of the annoying engine vibration at certain speeds (combination of RPMs around 1,200 and in high gear)

[seattle]

Originally Posted by bawareca

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

Originally Posted by bawareca

It will either has no power(50hp) or the full power, except if there are serious problems and boost leak.

Thanks for detailed explanation. I, a youtube amateur, always thought of a turbo as a "bonus". You get your regular 3.0L diesel engine, say 180hp/280tq. A turbo gets slapped on, gets the numbers substantially increased. If turbo goes bad, you get the bonus removed and still able to drive as a non-turbo diesel.

But, as you are saying, that is now so. With a bad turbo, or situation where it is not engaged just yet, very little power (tq and hp) is available.

Now, I remember when my brother's turbo-diesel Dodge truck had turbo going bad. That thing could barely go up hill in a parking lot; we are talking a 5.something liter engine.

Perhaps should educate myself more on this.

[josiahg52]

A "bad" turbo generally becomes a huge restriction in the exhaust AND intake paths effectively choking the engine. While it will produce non-turbo power, a lot of it is used just getting fresh air into and exhausting the hot gasses from the cylinders. It really comes down to the nature of the turbo failure, though.