lack of throttle response at start

[mjovic]

How do you know what version of programing you have? My build date is 01/2008.

[MINI135i]

This problem should be easily proven with a dyno before and after....

Someone had to have baselined dynoed their car before the 29.2 right, and then have done a dyno post update, right?????????

If the turbo is waiting to spool up compared to before 29.2 it will show on a dyno......

Post your dynos!:smile:

[Matt60158]

Probably someone complained the car was too jumpy off the line so they made the throttle by wire map less linear. Sounds like you should avoid the update or get the sprint booster to make the throttle more linear again.

[avus]

^^ you are exactly right
my SA told me almost word for word what you said

sprint booster, here i come...

[d1ez3]

so it's just the throttle? so just push harder and problem solved.

[mistermojorizin]

it doesn't matter how hard you push. it takes the computer a second to register the input, whether its slight or great.

in the lower rpm there is a bit of lag in the higher gears. example, you floor it in 4th at 1,000 rpm, the car sounds like the engine is working but not much is happening, then at 1,500 rpm it takes off. you floor it at 1,500 rpm in 4th, it'll take off at 2,000rpm.

below 4th gear its not really noticeable. and above 3,000 rpm in any gear its not really noticeable. just between 0-3,000rpm in 4th-6th, there is a lag for about 500rpms.

[blklacker]

are people with step having the same problem. I have step and never experienced this problem. It seems step always keeps the car in the powerband. jm2c 03/08 build

[atr_hugo]

If you read the e90post thread on this, they hint at a different methodology for wastgate position at idle in 29.2 than in the previous version. It seems that the wastgate is bleeding more to atmosphere at idle than before, it is not as 'closed' as previous and that means that it takes longer to bring boost up.

One of our resident BMW techs can probably put us straight if possible.

Also, if you have a good relationship with your CA/SA, you can ask them to NOT upgrade the software when you take it for other service (especially if there are not 'safety'/recall reasons to do so, and there are no problems you're reporting that require an upgrade).

YMMV and again I'd love to get the straight skinny from one of the BMW techs on 1Addicts.

[ronnyek]

As I've heard (and this may not be truly the case)...

The software upgrade was because n54s were having problems due to wg failure. If they adjusted the wg duty cycle, so that you'd effectively have less boost... it'd cause lag because boost would have to build back up from a stop or between shifts, but totally makes sense that it would be a result of adjusting wg duty cycle rather than trying to get down on the tuners. I personally would rather have something reliable over a bit of lag. Give em time, they'll figure it out and I'm betting they'll fix the lag problems

[ronnyek]

besides as long as I've been involved with turbos part throttle / full boost has always been looked down upon. The fact that the 135 spooled so early is phenominal, but doesnt supprise me if it DOES have problems doing that.

[mistermojorizin]

also, there's different types of lag at play here. there's a review on this forum from when the 135 just hit the market stating how bad the throttle response was. my car which i'm pretty sure doesn't have 29.2 or v81, has a delay in gears 4-6 below 2,500 rpm. a post on roadfly from 2006 detailed my situation to the t. so i conclude that the lag i'm experiencing is different than the wastegate lag with 29.2. or i could be wrong and my car did get updated to 29.2 when i picked it up in mid april. i whish there was a way to check that. but one fact is clear - people were reporting throttle lag before 29.2. so the wastegate explanation is just part of the explanation.

[0002s]

Let your car warm up to at least 210 for oil temps. The car will run slower until it warms up. This can take 15-20 minutes under normal driving from a cold start up in the morning.

[mistermojorizin]

Originally Posted by 0002s

Let your car warm up to at least 210 for oil temps. The car will run slower until it warms up. This can take 15-20 minutes under normal driving from a cold start up in the morning.

i'll pay attention to this, but i'm pretty sure that's not the issue, because i've tested this when my car is fully warm. its like at 2,000 in 4th, i hit the gas to the floor, i hear the car make a deep engine noise and start to pull a little for about half a second (like 500 rpms) and then the car pulls a lot. If i floor it at 1,000 in 4th, it'll do the same thing for half a sectond and then really start to accelerate at 1,500 rpm. at higher rpms or in lower gears, the lag is virtually gone.

[cracka]

Originally Posted by mistermojorizin

i'll pay attention to this, but i'm pretty sure that's not the issue, because i've tested this when my car is fully warm. its like at 2,000 in 4th, i hit the gas to the floor, i hear the car make a deep engine noise and start to pull a little for about half a second (like 500 rpms) and then the car pulls a lot. If i floor it at 1,000 in 4th, it'll do the same thing for half a sectond and then really start to accelerate at 1,500 rpm. at higher rpms or in lower gears, the lag is virtually gone.

Same observations here, mojo... I pretty much concur 100%. Mine is a 6MT with SSTT, January build and no software updates.

[0002s]

Originally Posted by mistermojorizin

i'll pay attention to this, but i'm pretty sure that's not the issue, because i've tested this when my car is fully warm. its like at 2,000 in 4th, i hit the gas to the floor, i hear the car make a deep engine noise and start to pull a little for about half a second (like 500 rpms) and then the car pulls a lot. If i floor it at 1,000 in 4th, it'll do the same thing for half a sectond and then really start to accelerate at 1,500 rpm. at higher rpms or in lower gears, the lag is virtually gone.

1400 rpm is when the torque curve starts to climb fast and it levels out @ around 2000 rpms. Then max torque stays flat to 6800 rpm and then starts to fall off, so your 1000 rpm 4th example is normal.

2000 in 4th for 1/2 second is normal

Boost does take some time to build. There doesn't sound like there is anything wrong with your car. Mine does and has done the same thing from day one. The car I test drove did the same thing. A 335i will do the same thing. It's normal

Even with my SSTT the car does the same thing just pulls harder once torque increases at a greater rate. You can look at a stock dyno graph and see the 1400 rpm point is where torque starts to come on until around 6800 rpms and then it begins to fall off slowly.

[Steve135i]

If somebody could do a dyno after they noticed the added turbolag, wouldn't it show on the dyno curve? So this 29.2 program was installed because of wastegate failures? What are the reasons for bmw to make the car slower/with lag? Wouldn't this show up if a magazine tested the 135i or 335i against other cars? I figure it should make the car slower? But I have no clue?