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      05-03-2018, 09:08 AM   #1
SharpAndCunning
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Heat Soak or Turbo Lag. Not entirely sure

So lately I've been noticing sometimes when I hit the gas (more than half throttle) from a stop or while moving the car immediately moves, sometimes it takes 1/2 second then "wakes" up. I'm leaning towards heat soak, as it never happens during the first couple minutes of driving.

It's similar to the old carburetor cars where they'd get hot, and the fuel would boil in the carb while running, and you'd get all kinds of off idle bogs.

Anyone else notice this in the x1 35i platform? No noticeable different in sport mode vs regular.
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      05-03-2018, 09:46 AM   #2
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Quote:
Originally Posted by SharpAndCunning View Post
So lately I've been noticing sometimes when I hit the gas (more than half throttle) from a stop or while moving the car immediately moves, sometimes it takes 1/2 second then "wakes" up. I'm leaning towards heat soak, as it never happens during the first couple minutes of driving.

It's similar to the old carburetor cars where they'd get hot, and the fuel would boil in the carb while running, and you'd get all kinds of off idle bogs.

Anyone else notice this in the x1 35i platform? No noticeable different in sport mode vs regular.
Do a search on throttle lag. I think this has more to do with throttle adaptation that many complain about. There is a reset procedure you can try:
http://e84.xbimmers.com/forums/showthread.php?t=812743

I use manual mode all the time and do not notice any lag whatsoever but maybe the adaptations do not apply in manual mode.
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      05-03-2018, 11:06 AM   #3
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Quote:
Originally Posted by themishmosh View Post
Do a search on throttle lag. I think this has more to do with throttle adaptation that many complain about. There is a reset procedure you can try:
http://e84.xbimmers.com/forums/showthread.php?t=812743

I use manual mode all the time and do not notice any lag whatsoever but maybe the adaptations do not apply in manual mode.
Thanks. That's interesting, but why do I only notice it when the car is fully warmed up? The throttle lag shouldn't be effected by temperature.

The transmission clear would be nice, but I'm sure my dealer wouldn't do that for free anymore, as my bumper to bumper is expired, and only have CPO remaining.
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      05-04-2018, 08:44 AM   #4
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Quote:
Originally Posted by SharpAndCunning View Post
Thanks. That's interesting, but why do I only notice it when the car is fully warmed up? The throttle lag shouldn't be effected by temperature.

The transmission clear would be nice, but I'm sure my dealer wouldn't do that for free anymore, as my bumper to bumper is expired, and only have CPO remaining.
Most newer cars are more responsive when cold because the transmission stays in lower gears in order to warm the engine.
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      05-04-2018, 03:54 PM   #5
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It is not heat soak. I agree with the above that I would look into the stock throttle mapping as well as which gear you leave from a stop. I doesn't always shift into 1st and starting from 2nd can feel like lag.
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      05-07-2018, 01:07 PM   #6
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Sorry to hijack. I've used the throttle reset to help my tip-in lag, and it works pretty well. However, does a transmission remap start the car in first gear when you just leave it in drive. I hate shifting the car manually, so I don't use manual mode ever.
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      05-07-2018, 01:14 PM   #7
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Quote:
Originally Posted by Turbod View Post
It is not heat soak. I agree with the above that I would look into the stock throttle mapping as well as which gear you leave from a stop. I doesn't always shift into 1st and starting from 2nd can feel like lag.
I did do the throttle reset, and noticed no difference. I tried it twice according to the posted procedure, and it makes a couple of quiet mechanical sounds, but if you shut the car off and sit there, it does the same thing.


It's funny, I notice this a lot in the girlfriends Rav4, it stays in 2nd unless you come to a complete stop and sit there for a second. I don't notice it in the x1 though.
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      05-07-2018, 03:49 PM   #8
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Quote:
Originally Posted by SharpAndCunning View Post
I did do the throttle reset, and noticed no difference. I tried it twice according to the posted procedure, and it makes a couple of quiet mechanical sounds, but if you shut the car off and sit there, it does the same thing.


It's funny, I notice this a lot in the girlfriends Rav4, it stays in 2nd unless you come to a complete stop and sit there for a second. I don't notice it in the x1 though.
When I mentioned throttle mapping I mean fix the issue by using a tune that can manipulate it or if you are against the idea of tuning the vehicle then you could look into the sprint booster.

If you pay attention you will notice the difference when you leave from 1st or 2nd gear. In my coupe I only use the paddle shifters and when I am going to take off from a stop I will leave it in 2nd, to keep traction. For normal driving I downshift into 1st.
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      05-07-2018, 07:36 PM   #9
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Yep, my s28i does that, and I even followed the reset procedure.

When taking off, it's hard to ease off, it wants to hall ass.

So, I ease out before hitting car in front, and then, tip gas back in.

That's when nothing for a second or two, and then, hall ass again.

If that's worst of car, I'll take it.
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      05-08-2018, 11:12 AM   #10
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Quote:
Originally Posted by Turbod View Post
When I mentioned throttle mapping I mean fix the issue by using a tune that can manipulate it or if you are against the idea of tuning the vehicle then you could look into the sprint booster.

If you pay attention you will notice the difference when you leave from 1st or 2nd gear. In my coupe I only use the paddle shifters and when I am going to take off from a stop I will leave it in 2nd, to keep traction. For normal driving I downshift into 1st.
The most i'd be willing to do would be a JB Stage 1, and while that would probably allow the extra boost to pull the car a little more, it's not going to do much for the throttle input/turbo lag.

I thought about a sprintbooster, but then at like 70/75 pedal travel you're at 100% throttle input, as I understand it. Sure it eliminates a dead pedal, by making it uber sensitive.

I wish my results with the reset were night and day like some others.
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      05-08-2018, 12:56 PM   #11
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Quote:
Originally Posted by SharpAndCunning View Post
The most i'd be willing to do would be a JB Stage 1, and while that would probably allow the extra boost to pull the car a little more, it's not going to do much for the throttle input/turbo lag.

I thought about a sprintbooster, but then at like 70/75 pedal travel you're at 100% throttle input, as I understand it. Sure it eliminates a dead pedal, by making it uber sensitive.

I wish my results with the reset were night and day like some others.
I would say not to bother with the stage 1. If the Sprintbooster isn't an option because of throttle sensitivity then all but linear throttle through MHD will have the same effect. The JB4 implemented menu 11 a year or so ago but I found that it just made more boost on lower throttle inputs. Although it made the car feel quicker in day to day driving I found that it would overboost on partial throttle.
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      05-08-2018, 01:56 PM   #12
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Quote:
Originally Posted by Turbod View Post
I would say not to bother with the stage 1. If the Sprintbooster isn't an option because of throttle sensitivity then all but linear throttle through MHD will have the same effect. The JB4 implemented menu 11 a year or so ago but I found that it just made more boost on lower throttle inputs. Although it made the car feel quicker in day to day driving I found that it would overboost on partial throttle.
Agreed. The Stage 1 is only going to make the car faster, day to day. But if more bost comes on earlier, it's possible that the throttle delay, where you have to quickly push the pedal a certain amount to get going and then reduce the speed at which you push the pedal might improve, only because the extra boost would help the car in that transient stage where it's just starting to move.
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      05-09-2018, 12:02 PM   #13
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i am a new owner of a used 28i, and i notice the there some unexpected lag once in a while. not quite if this a turbo lag or what. but it does suck
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      05-10-2018, 09:56 AM   #14
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Quote:
Originally Posted by mreric View Post
i am a new owner of a used 28i, and i notice the there some unexpected lag once in a while. not quite if this a turbo lag or what. but it does suck
Did you try the throttle reset procedure.
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      05-22-2018, 11:54 PM   #15
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Quote:
Originally Posted by themishmosh View Post
I use manual mode all the time and do not notice any lag whatsoever but maybe the adaptations do not apply in manual mode.
+1

in manual mode at higher rpm, i don't notice anything

In "D" mode, I notice it, and I have always thought it is because the engine rpms are below the boost threshold, and the gearbox is old design/dumb compared to the sport 8AT of the "F" generation

Just keep the revs up OP, when you want the car to hustle
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      05-23-2018, 09:10 AM   #16
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Quote:
Originally Posted by SharpAndCunning View Post
Did you try the throttle reset procedure.
I did, and i t worked !! the lag was gone and the gas pedal felt very natural. but it seem to have only lasted about 1 week and is back.
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