Throttle lag
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,642
Likes: 4,082
From: Cape Coral, Florida
You are not giving us a lot of information so I have no idea of what you're asking !!..."lessen that new throttle body" ??...below is part of a TSB...some types of lag are NORMAL !!
Some customers may comment on a sag or hesitation when accelerating under the following conditions:
Some customers may comment on a sag or hesitation when accelerating under the following conditions:
- When coasting at low speeds of less than 24 km/h (15 mph) with a closed throttle and then aggressively applying the throttle.
- Examples of this maneuver include a rolling stop or a lane change maneuver. In this type of maneuver, even though the accelerator is applied aggressively, the throttle blade is opened slowly for up to 0.7 seconds to help minimize driveline lash and clunking.
- Also, in a vehicle equipped with an automatic transmission when making a hard, complete stop with a closed throttle, immediately followed by an aggressive throttle opening, the transmission downshifts may not be completed by the time the throttle is opened.
- As a result, approximately 0.5 seconds of ″zero″ torque may be commanded to allow the shift to first gear to occur.
-
- This type of driving maneuver may result in approximately 0.5 seconds of ″zero″ torque being commanded to allow the downshift to complete.
-
Last edited by C5 Diag; Jun 3, 2026 at 08:10 PM.
I Love My C7
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From: Go Bucks!…
2024 C7 of the Year Finalist - Unmodified
2023 C7 of the Year Finalist - Unmodified
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Instructor
Joined: Sep 2015
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From: Richland WA
I Love My C7
Joined: May 2023
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From: Go Bucks!…
2024 C7 of the Year Finalist - Unmodified
2023 C7 of the Year Finalist - Unmodified
Le Mans Master
Joined: Jun 2019
Posts: 5,501
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From: Loveland
AI, INFO:
On a naturally aspirated 2015 LT1 engine, upgrading from an OEM throttle body (87mm) to a larger throttle body (like a 92mm, 95mm, or LT5/C7 ZR1 unit) yields virtually no horsepower on an otherwise stock motor. It is most beneficial when paired with extensive modifications.
Last edited by kodpkd; Jun 4, 2026 at 10:27 AM.
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Joined: Jul 2005
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The Soler throttle control will instantly fix the lag and will also give you control of how your car drives.
I have a manual and when shifting at low revs in stop and go traffic the engine would bog down. I installed Soler's throttle body and that instantly took care of that issue. They make fantastic products.
I have a manual and when shifting at low revs in stop and go traffic the engine would bog down. I installed Soler's throttle body and that instantly took care of that issue. They make fantastic products.
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Team Owner
Joined: Sep 2000
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From: Far NW 'burbs of Chicago
St. Jude Donor '13
You are not giving us a lot of information so I have no idea of what you're asking !!..."lessen that new throttle body" ??...below is part of a TSB...some types of lag are NORMAL !!
Some customers may comment on a sag or hesitation when accelerating under the following conditions:
Some customers may comment on a sag or hesitation when accelerating under the following conditions:
- When coasting at low speeds of less than 24 km/h (15 mph) with a closed throttle and then aggressively applying the throttle.
- Examples of this maneuver include a rolling stop or a lane change maneuver. In this type of maneuver, even though the accelerator is applied aggressively, the throttle blade is opened slowly for up to 0.7 seconds to help minimize driveline lash and clunking.
- Also, in a vehicle equipped with an automatic transmission when making a hard, complete stop with a closed throttle, immediately followed by an aggressive throttle opening, the transmission downshifts may not be completed by the time the throttle is opened.
- As a result, approximately 0.5 seconds of ″zero″ torque may be commanded to allow the shift to first gear to occur.
-
- This type of driving maneuver may result in approximately 0.5 seconds of ″zero″ torque being commanded to allow the downshift to complete.
-
Which says basically the same thing.
Le Mans Master
Joined: Jun 2019
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From: Loveland
Le Mans Master
Joined: Jun 2016
Posts: 5,456
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From: Cincinnati, OH
@smitty2919 can recommend w detail.
You can do a ported TB from various vendors and some like to add controllers. I don't like the idea of controllers in between my foot and the motor in case something glitches. I fixed my throttle lag with a Mamo Ported TB and have been very happy. It uses a OEM TB to start with and is ported in a way to allow more airflow at low throttle angle. Fixed my tip in throttle issue 100% and I can actually rev match downshift like I could in my previous C5 Z06.
The issue IMO comes down to the TB design and how GM programmed the throttle blade opening angle at certain throttle inputs. After researching this I thought it was best to fix the issue with a ported TB that eliminated this airflow issue and did not have to retune the car. Bolt it on and drive it.
Last edited by smitty2919; Jun 8, 2026 at 08:30 AM.
Instructor
Joined: Jul 2025
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I fixed the bog down at low speed in my m7 with the soler throttle body.
I'm still debating if buy the throttle controller but if what you are looking is to improve the response to the amount of input you give with the foot, then go for it.
I'm still debating if buy the throttle controller but if what you are looking is to improve the response to the amount of input you give with the foot, then go for it.
Team Owner
Joined: Jul 2004
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From: Hartford WI
If the engine doesn't used the air, what is the point? So does the engine need the air would be the question. If all it does is fool the ECM into giving you more throttle for the same amount of pedal travel, won't you run out of throttle at some point? IOW, if at half depression you now have full throttle, what happens between half depression and full depression? That makes me think that it is going to let you depress the throttle from half way till you reach the floor but you get nothing more out of the engine? Doesn't this also mean you lose granular control of the throttle? Doesn't it also make the car more susceptible to wheel spin?
Burning Brakes
Joined: Jul 2021
Posts: 824
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From: Edgewater, FL
2024 C7 of the Year Finalist - Unmodified
If the engine doesn't used the air, what is the point? So does the engine need the air would be the question. If all it does is fool the ECM into giving you more throttle for the same amount of pedal travel, won't you run out of throttle at some point? IOW, if at half depression you now have full throttle, what happens between half depression and full depression? That makes me think that it is going to let you depress the throttle from half way till you reach the floor but you get nothing more out of the engine? Doesn't this also mean you lose granular control of the throttle? Doesn't it also make the car more susceptible to wheel spin?
