Bog during boost?
Thread Starter
Melting Slicks
Joined: Sep 2004
Posts: 3,287
Likes: 1
From: Union City CA
Bog during boost?
Hi guys, need a little help.
I have a Vortech supercharger on a C6 with LG headers and running about 6psi boost with a 4.5 in pulley so the car is pretty safe putting down about 500rwhp.
The problem I am noticing sometimes is when I am in 2nd or 3 gear (A6) and into boost, the car will pull hard for a while and then all of a sudden, it will bog.
It used to happen once in a while but now it is happening more often.
Can someone tell me what to look for? At first I thought I was over rev the engine and hit the rev limiter but I noticed I was only at 5800-6000rpm when it happened last time.
It also happens a lot when I get into boost but then back off. Is this normal to bog when I back off while in boost?
I am going to get my tuner to look at his tune (HP) but he is under the weather right now.
Thanks for any help.
I have a Vortech supercharger on a C6 with LG headers and running about 6psi boost with a 4.5 in pulley so the car is pretty safe putting down about 500rwhp.
The problem I am noticing sometimes is when I am in 2nd or 3 gear (A6) and into boost, the car will pull hard for a while and then all of a sudden, it will bog.
It used to happen once in a while but now it is happening more often.
Can someone tell me what to look for? At first I thought I was over rev the engine and hit the rev limiter but I noticed I was only at 5800-6000rpm when it happened last time.
It also happens a lot when I get into boost but then back off. Is this normal to bog when I back off while in boost?
I am going to get my tuner to look at his tune (HP) but he is under the weather right now.
Thanks for any help.
Thread Starter
Melting Slicks
Joined: Sep 2004
Posts: 3,287
Likes: 1
From: Union City CA
Instructor
Joined: Oct 2006
Posts: 233
Likes: 0
From: Tempe Arizona
I have the same.
I have the same thing happening. To the best of my knowledge it’s occurring because of wheel spin and TC. The control module is pulling timing and reducing power to the wheels, it thinks you’re out of control. I submitted the same question a while back and this explanation is the best I could get. I have not tried it but go to comp mode and see if it helps. Then try turning everything off and see what you get. Of course do it in a safe environment it my get a little difficult to handle. I would try this before I go back to the tuner. Let me know what you fine.
Le Mans Master
Joined: Aug 1999
Posts: 8,827
Likes: 10
Charlie,
Hey man! Remember me?
Sounds like you might need to change your plugs - especially if you've run any leaded fuel.
Do you have an A:F gauge? If so, what's the number when you experience this? Any DTC's?
It could be torque management but I'm inclined to believe it's something else since you seem to think it's happening more often as of late.
Hey man! Remember me?
Sounds like you might need to change your plugs - especially if you've run any leaded fuel.
Do you have an A:F gauge? If so, what's the number when you experience this? Any DTC's?
It could be torque management but I'm inclined to believe it's something else since you seem to think it's happening more often as of late.
Thread Starter
Melting Slicks
Joined: Sep 2004
Posts: 3,287
Likes: 1
From: Union City CA
Charlie,
Hey man! Remember me?
Sounds like you might need to change your plugs - especially if you've run any leaded fuel.
Do you have an A:F gauge? If so, what's the number when you experience this? Any DTC's?
It could be torque management but I'm inclined to believe it's something else since you seem to think it's happening more often as of late.
Hey man! Remember me?
Sounds like you might need to change your plugs - especially if you've run any leaded fuel.
Do you have an A:F gauge? If so, what's the number when you experience this? Any DTC's?
It could be torque management but I'm inclined to believe it's something else since you seem to think it's happening more often as of late.
I have never run anything but unleaded 91/
Don't have an A/F guage since I wouldn't know how to read it.
Nothing on the Display.
It is happening more maybe because of the colder weather? It has happened a few times on Thunderhill road course.
Thread Starter
Melting Slicks
Joined: Sep 2004
Posts: 3,287
Likes: 1
From: Union City CA
I have the same thing happening. To the best of my knowledge it’s occurring because of wheel spin and TC. The control module is pulling timing and reducing power to the wheels, it thinks you’re out of control. I submitted the same question a while back and this explanation is the best I could get. I have not tried it but go to comp mode and see if it helps. Then try turning everything off and see what you get. Of course do it in a safe environment it my get a little difficult to handle. I would try this before I go back to the tuner. Let me know what you fine.
It would be in boost and running great until I lift a little to slow down and it will bog big time (where I am thrown forward).
Le Mans Master
Joined: Aug 1999
Posts: 8,827
Likes: 10
Charlie,
Do you turn traction control off when you first start your car each time you get in it? If so, we can almost rule that out... If not, then yes, with the cooler temps I'm inclined to believe it's TC.
Else, it could be a lean condition brought on (unlikely but possible) by the cooler temps. We really need some logged data to make an informed recommendation.
Do you turn traction control off when you first start your car each time you get in it? If so, we can almost rule that out... If not, then yes, with the cooler temps I'm inclined to believe it's TC.
Else, it could be a lean condition brought on (unlikely but possible) by the cooler temps. We really need some logged data to make an informed recommendation.
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Le Mans Master
Joined: Aug 1999
Posts: 8,827
Likes: 10
Mr. Big's observation makes me ask another question - Is this bog during transition from vacuum to boost or when you are already well into boost? You do have a boost guage that shows vacuum, right? That's the only way you'd be able to answer the question above.
Thread Starter
Melting Slicks
Joined: Sep 2004
Posts: 3,287
Likes: 1
From: Union City CA
I don't think the belt is slipping because my boost gauge shows the boost at 6.5-7psi.
I just had my belt tensioner replaced due to a bad tensioner.
I will get someone with a computer to ride with me and I hope I can get it to repeat.
I just had my belt tensioner replaced due to a bad tensioner.
I will get someone with a computer to ride with me and I hope I can get it to repeat.
Safety Car
Joined: Apr 2004
Posts: 3,932
Likes: 8
From: Hayward California
Arnel
Instructor
Joined: Feb 2001
Posts: 199
Likes: 4
From: Lake Worth Florida
I have an APS Twin Turbo and a couple of months ago I had the same problem. We pilled the spark plugs and found that they were in need of change. since then no more hesitation. worth a look
Thread Starter
Melting Slicks
Joined: Sep 2004
Posts: 3,287
Likes: 1
From: Union City CA
PS, did you just replace the same plugs or did you change the range?
Instructor
Joined: Oct 2006
Posts: 233
Likes: 0
From: Tempe Arizona
I do not think it plugs. I had new cooler plugs installed at installation of my SC. There are too many people experiencing the problem for it to all be plugs. I still think it the TC and the computer pulling timing. CSUN213 at 50 miles per depending on what HP and TQ your running wheel spin maybe happen. On my setup there is most defiantly wheel spin, smoke and fish tail at 50 MPH at full throttle. Try turning all the controls off and see what happens.