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      11-21-2021, 01:19 AM   #1
mkw110
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Weird felling when car in 7th or 8th gear

Recently I feel that when the boost kick in during 1500rpm in 7th or 8th gear, the car feels like can not hold the boost and begin to leak some of the boost. Only in rpm range when you start from low to 1500rpm in 7th 8th gear. Can anyone give me some suggestions?
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      11-21-2021, 01:22 AM   #2
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May be vacuum line or waste gate control unit? I don't know
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      11-21-2021, 01:23 AM   #3
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Has anyone experienced this before?
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      11-21-2021, 06:48 AM   #4
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Quote:
Originally Posted by mkw110 View Post
Recently I feel that when the boost kick in during 1500rpm in 7th or 8th gear, the car feels like can not hold the boost and begin to leak some of the boost. Only in rpm range when you start from low to 1500rpm in 7th 8th gear. Can anyone give me some suggestions?
What is the year of your car? Have you modified the car or is it stock? Does this happen when the transmission is in auto or manual mode?
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      11-21-2021, 08:27 AM   #5
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Originally Posted by AHall View Post
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Originally Posted by mkw110 View Post
Recently I feel that when the boost kick in during 1500rpm in 7th or 8th gear, the car feels like can not hold the boost and begin to leak some of the boost. Only in rpm range when you start from low to 1500rpm in 7th 8th gear. Can anyone give me some suggestions?
What is the year of your car? Have you modified the car or is it stock? Does this happen when the transmission is in auto or manual mode?
It's 2018 f90. It's has a bm3 stage 1 on it, but when I tune it back to stock, the problem is there too. also happens both in manual and auto mode.
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      11-21-2021, 09:44 AM   #6
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This is called lugging, do not do it. Do not try to make boost at that low of an RPM with that high of a gear. This scenario is how the majority of rods are bent on this platform. Our cars have HUGE turbos and they are meant to spool up much higher in the RPM range. If you feel the car start to lug, downshift with your paddle.
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      11-21-2021, 01:18 PM   #7
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Originally Posted by DrivenAgain View Post
This is called lugging, do not do it. Do not try to make boost at that low of an RPM with that high of a gear. This scenario is how the majority of rods are bent on this platform. Our cars have HUGE turbos and they are meant to spool up much higher in the RPM range. If you feel the car start to lug, downshift with your paddle.
Is the " lugging" a common issue happen a this engine?
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      11-21-2021, 01:19 PM   #8
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This is called lugging, do not do it. Do not try to make boost at that low of an RPM with that high of a gear. This scenario is how the majority of rods are bent on this platform. Our cars have HUGE turbos and they are meant to spool up much higher in the RPM range. If you feel the car start to lug, downshift with your paddle.
When I put he gearbox logic in the level one , it will automatically doing this kind of action . So should I drive in level two?
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      11-21-2021, 01:23 PM   #9
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Quote:
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Quote:
Originally Posted by DrivenAgain View Post
This is called lugging, do not do it. Do not try to make boost at that low of an RPM with that high of a gear. This scenario is how the majority of rods are bent on this platform. Our cars have HUGE turbos and they are meant to spool up much higher in the RPM range. If you feel the car start to lug, downshift with your paddle.
When I put he gearbox logic in the level one , it will automatically doing this kind of action . So should I drive in level two?
Yes level 1 will make the transmission sluggish, level 2 is better for daily driving and will force more downshifts, that initial boost hit before the downshift is what you want to avoid, u can hear it like the engine is struggling and won't downshift
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      11-21-2021, 01:24 PM   #10
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Quote:
Originally Posted by DrivenAgain View Post
Quote:
Originally Posted by mkw110 View Post
Quote:
Originally Posted by DrivenAgain View Post
This is called lugging, do not do it. Do not try to make boost at that low of an RPM with that high of a gear. This scenario is how the majority of rods are bent on this platform. Our cars have HUGE turbos and they are meant to spool up much higher in the RPM range. If you feel the car start to lug, downshift with your paddle.
When I put he gearbox logic in the level one , it will automatically doing this kind of action . So should I drive in level two?
Yes level 1 will make the transmission sluggish, level 2 is better for daily driving and will force more downshifts, that initial boost hit before the downshift is what you want to avoid, u can hear it like the engine is struggling and won't downshift
It make sense. Is this " lugging " action happens in your car too?
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      11-21-2021, 01:30 PM   #11
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Quote:
Originally Posted by mkw110 View Post
Quote:
Originally Posted by DrivenAgain View Post
Quote:
Originally Posted by mkw110 View Post
Quote:
Originally Posted by DrivenAgain View Post
This is called lugging, do not do it. Do not try to make boost at that low of an RPM with that high of a gear. This scenario is how the majority of rods are bent on this platform. Our cars have HUGE turbos and they are meant to spool up much higher in the RPM range. If you feel the car start to lug, downshift with your paddle.
When I put he gearbox logic in the level one , it will automatically doing this kind of action . So should I drive in level two?
Yes level 1 will make the transmission sluggish, level 2 is better for daily driving and will force more downshifts, that initial boost hit before the downshift is what you want to avoid, u can hear it like the engine is struggling and won't downshift
It make sense. Is this " lugging " action happens in your car too?
Yes they all do it. Another scenario is shifting to control your speed in manual, and forgetting to go back to Auto. Like forgetting your in manual gear 7 at 1500rom then floor it at low speed, also not a good situation.
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      11-21-2021, 01:36 PM   #12
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Quote:
Originally Posted by DrivenAgain View Post
Quote:
Originally Posted by mkw110 View Post
Quote:
Originally Posted by DrivenAgain View Post
Quote:
Originally Posted by mkw110 View Post
Quote:
Originally Posted by DrivenAgain View Post
This is called lugging, do not do it. Do not try to make boost at that low of an RPM with that high of a gear. This scenario is how the majority of rods are bent on this platform. Our cars have HUGE turbos and they are meant to spool up much higher in the RPM range. If you feel the car start to lug, downshift with your paddle.
When I put he gearbox logic in the level one , it will automatically doing this kind of action . So should I drive in level two?
Yes level 1 will make the transmission sluggish, level 2 is better for daily driving and will force more downshifts, that initial boost hit before the downshift is what you want to avoid, u can hear it like the engine is struggling and won't downshift
It make sense. Is this " lugging " action happens in your car too?
Yes they all do it. Another scenario is shifting to control your speed in manual, and forgetting to go back to Auto. Like forgetting your in manual gear 7 at 1500rom then floor it at low speed, also not a good situation.
One question: I am not flooring it like to have a hard push in a low rpm and low gear. I just foot on the accelerator very little , then the car begins to boost leak and give me a feeling like " lugging"
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      11-21-2021, 02:30 PM   #13
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Quote:
Originally Posted by mkw110 View Post
Quote:
Originally Posted by DrivenAgain View Post
Quote:
Originally Posted by mkw110 View Post
Quote:
Originally Posted by DrivenAgain View Post
Quote:
Originally Posted by mkw110 View Post
Quote:
Originally Posted by DrivenAgain View Post
This is called lugging, do not do it. Do not try to make boost at that low of an RPM with that high of a gear. This scenario is how the majority of rods are bent on this platform. Our cars have HUGE turbos and they are meant to spool up much higher in the RPM range. If you feel the car start to lug, downshift with your paddle.
When I put he gearbox logic in the level one , it will automatically doing this kind of action . So should I drive in level two?
Yes level 1 will make the transmission sluggish, level 2 is better for daily driving and will force more downshifts, that initial boost hit before the downshift is what you want to avoid, u can hear it like the engine is struggling and won't downshift
It make sense. Is this " lugging " action happens in your car too?
Yes they all do it. Another scenario is shifting to control your speed in manual, and forgetting to go back to Auto. Like forgetting your in manual gear 7 at 1500rom then floor it at low speed, also not a good situation.
One question: I am not flooring it like to have a hard push in a low rpm and low gear. I just foot on the accelerator very little , then the car begins to boost leak and give me a feeling like " lugging"
It's not leaking boost although it sounds like it, that's the sound of the the "lugging" and it's most noticeable at part throttle, full throttle would cause a downshift.
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      11-21-2021, 02:32 PM   #14
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Quote:
Originally Posted by DrivenAgain View Post
Quote:
Originally Posted by mkw110 View Post
Quote:
Originally Posted by DrivenAgain View Post
Quote:
Originally Posted by mkw110 View Post
Quote:
Originally Posted by DrivenAgain View Post
Quote:
Originally Posted by mkw110 View Post
Quote:
Originally Posted by DrivenAgain View Post
This is called lugging, do not do it. Do not try to make boost at that low of an RPM with that high of a gear. This scenario is how the majority of rods are bent on this platform. Our cars have HUGE turbos and they are meant to spool up much higher in the RPM range. If you feel the car start to lug, downshift with your paddle.
When I put he gearbox logic in the level one , it will automatically doing this kind of action . So should I drive in level two?
Yes level 1 will make the transmission sluggish, level 2 is better for daily driving and will force more downshifts, that initial boost hit before the downshift is what you want to avoid, u can hear it like the engine is struggling and won't downshift
It make sense. Is this " lugging " action happens in your car too?
Yes they all do it. Another scenario is shifting to control your speed in manual, and forgetting to go back to Auto. Like forgetting your in manual gear 7 at 1500rom then floor it at low speed, also not a good situation.
One question: I am not flooring it like to have a hard push in a low rpm and low gear. I just foot on the accelerator very little , then the car begins to boost leak and give me a feeling like " lugging"
It's not leaking boost although it sounds like it, that's the sound of the the "lugging" and it's most noticeable at part throttle, full throttle would cause a downshift.
Thank you for your help!
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      11-21-2021, 06:05 PM   #15
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Turbo and 1500rpm do not mix. Increase rpm.
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      11-21-2021, 06:08 PM   #16
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Wow, I did not realise this, thanks folks for this advice
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      11-21-2021, 08:57 PM   #17
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So I was having some issues similar to this where on part throttle car would hesitate at low rpm. I will also get cyl 5 misfire in idle but not in wot.

So I was gonna change the coil and injector for cyl 5 as plugs are new but this morning I wanted to try an injector cleaner and tried liqui Molly in 3/4th tank. After some spirited driving, car is a lot smoother, no codes, no hiccups. I'm gonna drive it for a couple of more days and hope issue is fixed.
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      11-21-2021, 09:03 PM   #18
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So I was having some issues similar to this where on part throttle car would hesitate at low rpm. I will also get cyl 5 misfire in idle but not in wot.

So I was gonna change the coil and injector for cyl 5 as plugs are new but this morning I wanted to try an injector cleaner and tried liqui Molly in 3/4th tank. After some spirited driving car is a lot smoother, no codes, no hiccups. I'm gonna drive it for couple or more days and and hope issues is fixed.
Thanks for your reply! Helps a lot!
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      11-23-2021, 07:30 AM   #19
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noticed something similar felt like my tranny was messed up because it was jerking. at maybe 60-65 if i lay lightly on the throttle on the interstate it bucks unless i push down further. My guess was the transmission needed to downshift but the electronics must glitch at certain speeds versus throttle position. I have Racechip and in most other cirucumstances never experience it. My gut tells me not to lug in economy setting at highway speeds so i usually put tranny in second position.
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      11-24-2021, 01:23 PM   #20
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noticed something similar felt like my tranny was messed up because it was jerking. at maybe 60-65 if i lay lightly on the throttle on the interstate it bucks unless i push down further. My guess was the transmission needed to downshift but the electronics must glitch at certain speeds versus throttle position. I have Racechip and in most other cirucumstances never experience it. My gut tells me not to lug in economy setting at highway speeds so i usually put tranny in second position.
Exactly same situation!
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      11-25-2021, 08:34 AM   #21
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Recently I feel that when the boost kick in during 1500rpm in 7th or 8th gear, the car feels like can not hold the boost and begin to leak some of the boost. Only in rpm range when you start from low to 1500rpm in 7th 8th gear. Can anyone give me some suggestions?
what part of Pa? i am just outside Pittsburgh
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      11-27-2021, 02:41 PM   #22
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Recently I feel that when the boost kick in during 1500rpm in 7th or 8th gear, the car feels like can not hold the boost and begin to leak some of the boost. Only in rpm range when you start from low to 1500rpm in 7th 8th gear. Can anyone give me some suggestions?
what part of Pa? i am just outside Pittsburgh
State college. Lol
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