997 2005-2012 911 C2, C2S, C4, C4S, GTS, Targa and Cabriolet Model Discussion.
Sponsored by:
Sponsored by: CARiD

997 VF-Engineering Supercharger problem

Thread Tools
 
Search this Thread
 
Rate Thread
 
  #1  
Old 05-05-2016 | 03:03 PM
jfc68660's Avatar
Thread Starter
|
Registered User
Joined: May 2013
Posts: 12
From: Vero Beach Florida
Rep Power: 0
jfc68660 is infamous around these parts
997 VF-Engineering Supercharger problem

I have a 2006, 3.6 Carrera 4, manual transmission with the VF-Engineering supercharger kit. It has been installed in the car since 2013 and about 30K miles and for the last 10K or so I've been fighting a problem which has had the car back to the local dealership too many times to count.

There is some kind of issue between the Mass Airflow Sensor relating
to the supercharger and the tune programming on the ECU. If I accelerate hard thru first gear the car performance when cold the acceleration is flawless, 2nd gear 6 and 7000 rpm's the car surges and
dips in RPM and Surges but not steady as it should.
If the mass airflow sensor is disconnected and the ecu goes into closed loop then it runs perfect in each gear. We have tried replacing the MAF and the associated temp sensor on the supercharger intercooler but no cure. Also, replaced all of the sparkplugs.
The problem is much more pronounced when the car is warm and also when the air temp outside is hotter than 70 degrees which is most of the time since I live in Florida.

I have called VF multiple times and they always say to send an email which I've done multiple times and VF-engineering never puts me thru to a tech.. The Dealer has run into the same problem So anyone that can offer some assistance with this issue would be greatly appreciated as I have the car at the dealership now trying to chase down the problem again.
Thanks.
 
  #2  
Old 05-06-2016 | 03:24 AM
MrPrice's Avatar
Registered User
Joined: Aug 2013
Posts: 441
From: PA
Rep Power: 39
MrPrice has much to be proud ofMrPrice has much to be proud ofMrPrice has much to be proud ofMrPrice has much to be proud ofMrPrice has much to be proud ofMrPrice has much to be proud ofMrPrice has much to be proud ofMrPrice has much to be proud of
I have had the VF kit in my car for around 9 years, and I would not recommend running the car to those RPM's until it has warmed up, I would also suggest checking the air filter. The little thing gets pretty dirt pretty fast. I keep 2 extras in my garage and change them often and then clean the one that was in the car. I made many alterations to their kit over the years but have never had any issues with it.
 
  #3  
Old 05-06-2016 | 06:44 AM
jfc68660's Avatar
Thread Starter
|
Registered User
Joined: May 2013
Posts: 12
From: Vero Beach Florida
Rep Power: 0
jfc68660 is infamous around these parts
Mr Price,
thank you for the reply, I don't normally make it a habbit of running those RPM's when cold and have only been doing it to try and diagnose. Thanks for the filter tip. How many miles do you have on the supercharger kit and what alterations have you made?
 
  #4  
Old 05-06-2016 | 09:07 PM
Cattman's Avatar
Registered User
Joined: Jan 2007
Posts: 1,953
From: ATL
Rep Power: 199
Cattman Is a GOD !Cattman Is a GOD !Cattman Is a GOD !Cattman Is a GOD !Cattman Is a GOD !Cattman Is a GOD !Cattman Is a GOD !Cattman Is a GOD !Cattman Is a GOD !Cattman Is a GOD !Cattman Is a GOD !
Have you checked all the air connections?
Are you running the recommended pulley or a smaller one? Do you have a resistor inline with the MAF sensor?
CATTMAN
 
  #5  
Old 05-07-2016 | 05:07 AM
MrPrice's Avatar
Registered User
Joined: Aug 2013
Posts: 441
From: PA
Rep Power: 39
MrPrice has much to be proud ofMrPrice has much to be proud ofMrPrice has much to be proud ofMrPrice has much to be proud ofMrPrice has much to be proud ofMrPrice has much to be proud ofMrPrice has much to be proud ofMrPrice has much to be proud of
My car was completely taken apart 24 hours after I bought it, and over the next year and a half was very slowly put back together, many of the parts were one off I designed myself, the kit needed to be modified to fit those designs. I do not think anything I had to do would be helpful to your situation unless you plan to rebuild your car as well. My 997 is one of many cars I own and is only driven under certain conditions, it is 10 years old and only has a bit over 16K miles.
 
  #6  
Old 05-07-2016 | 12:27 PM
tphan's Avatar
Registered User
Joined: May 2013
Posts: 803
From: Dallas, TX
Rep Power: 68
tphan has a reputation beyond reputetphan has a reputation beyond reputetphan has a reputation beyond reputetphan has a reputation beyond reputetphan has a reputation beyond reputetphan has a reputation beyond reputetphan has a reputation beyond reputetphan has a reputation beyond reputetphan has a reputation beyond reputetphan has a reputation beyond reputetphan has a reputation beyond repute
Car run perfect when MAF disconnected, this is the clue.

Is MAF and injectors stock? MAF could be out of calibration to injector size.
 
  #7  
Old 05-08-2016 | 05:12 PM
Cattman's Avatar
Registered User
Joined: Jan 2007
Posts: 1,953
From: ATL
Rep Power: 199
Cattman Is a GOD !Cattman Is a GOD !Cattman Is a GOD !Cattman Is a GOD !Cattman Is a GOD !Cattman Is a GOD !Cattman Is a GOD !Cattman Is a GOD !Cattman Is a GOD !Cattman Is a GOD !Cattman Is a GOD !
You may need a resistor inline with the MAF to "trick it". One easy thing to try is just clean the MAF sensor with MAF cleaner. Might to do the trick.
CATTMAN
 
  #8  
Old 05-09-2016 | 03:00 PM
jfc68660's Avatar
Thread Starter
|
Registered User
Joined: May 2013
Posts: 12
From: Vero Beach Florida
Rep Power: 0
jfc68660 is infamous around these parts
997 vf-engineering supercharger problem

You may need a resistor inline with the MAF to "trick it". One easy thing to try is just clean the MAF sensor with MAF cleaner. Might to do the trick.
CATTMAN


I was just speaking with the Tech at Porsche and we thought the same thing, any idea what value resistor?
 
  #9  
Old 05-10-2016 | 08:20 AM
jfc68660's Avatar
Thread Starter
|
Registered User
Joined: May 2013
Posts: 12
From: Vero Beach Florida
Rep Power: 0
jfc68660 is infamous around these parts
Supercharger Issue VF-Engineering

Hi all,
Thanks for the replys. I finally got a return phone call to the dealership by VF-Engineering and an email to me.

It seems that the problem here is that at high RPM with boost the MAF is out of range. VF-Engineering's answer to that is to put a resister in line on the signal wire to the MAF to give lower numbers back to the DME or as an alternate adjust the software to scale down the MAF. The problem of course is that we will have to confirm that the AFR is not too lean and not safe.

Basically this is a BS fix. Rather than replacing the MAF with a MAP sensor and properly tuning to the MAP they know there is an issue here and their fix is to give false readings from the MAF across the entire RPM range to smooth out the high end.

Anyone know a good tuner in east central florida ?
 
  #10  
Old 06-06-2016 | 07:35 PM
justatoy's Avatar
Registered User
Joined: Jan 2008
Posts: 2,370
From: Vancouver
Rep Power: 327
justatoy Is a GOD !justatoy Is a GOD !justatoy Is a GOD !justatoy Is a GOD !justatoy Is a GOD !justatoy Is a GOD !justatoy Is a GOD !justatoy Is a GOD !justatoy Is a GOD !justatoy Is a GOD !justatoy Is a GOD !
Originally Posted by jfc68660
You may need a resistor inline with the MAF to "trick it". One easy thing to try is just clean the MAF sensor with MAF cleaner. Might to do the trick.
CATTMAN


I was just speaking with the Tech at Porsche and we thought the same thing, any idea what value resistor?
Been a long time but I think VF installed a 370 Ohm resistor!
 
  #11  
Old 06-07-2016 | 06:45 AM
jfc68660's Avatar
Thread Starter
|
Registered User
Joined: May 2013
Posts: 12
From: Vero Beach Florida
Rep Power: 0
jfc68660 is infamous around these parts
porsche 997 supercharger problem

Been a long time but I think VF installed a 370 Ohm resistor!

Thank you, we have decided against the resistor as that will fool the MAF thru the entire range which could lead to leaning out the engine which is not safe. Finally got in touch with VF Engineering and they are supposedly testing the software against another 997 to see if there is something wrong with their programming. This has been going on for 3 weeks so I am holding my breath. Meanwhile I have installed a switch to turn off the MAF when desired which puts the car in open loop and it runs good then. I am leaning towards changing the Oxygen sensors even though the voltages and flip/flop's between +-5 volts seems to be working correctly.
 
  #12  
Old 06-08-2016 | 06:53 AM
White Rock's Avatar
Registered User
Joined: Jul 2009
Posts: 2,429
From: Atlanta, GA
Rep Power: 156
White Rock Is a GOD !White Rock Is a GOD !White Rock Is a GOD !White Rock Is a GOD !White Rock Is a GOD !White Rock Is a GOD !White Rock Is a GOD !White Rock Is a GOD !White Rock Is a GOD !White Rock Is a GOD !White Rock Is a GOD !
Originally Posted by jfc68660
Hi all,
Thanks for the replys. I finally got a return phone call to the dealership by VF-Engineering and an email to me.

It seems that the problem here is that at high RPM with boost the MAF is out of range. VF-Engineering's answer to that is to put a resister in line on the signal wire to the MAF to give lower numbers back to the DME or as an alternate adjust the software to scale down the MAF. The problem of course is that we will have to confirm that the AFR is not too lean and not safe.

Basically this is a BS fix. Rather than replacing the MAF with a MAP sensor and properly tuning to the MAP they know there is an issue here and their fix is to give false readings from the MAF across the entire RPM range to smooth out the high end.

Anyone know a good tuner in east central florida ?
If I remember correctly, I think Scott with Softronic is in your area. He should be able to help.
 
  #13  
Old 06-08-2016 | 07:36 AM
jfc68660's Avatar
Thread Starter
|
Registered User
Joined: May 2013
Posts: 12
From: Vero Beach Florida
Rep Power: 0
jfc68660 is infamous around these parts
porsche 997 supercharger problem

Originally Posted by White Rock
If I remember correctly, I think Scott with Softronic is in your area. He should be able to help.

Do you have a contact telephone or email for him?
Thanks,
John
 
  #14  
Old 06-08-2016 | 08:50 AM
White Rock's Avatar
Registered User
Joined: Jul 2009
Posts: 2,429
From: Atlanta, GA
Rep Power: 156
White Rock Is a GOD !White Rock Is a GOD !White Rock Is a GOD !White Rock Is a GOD !White Rock Is a GOD !White Rock Is a GOD !White Rock Is a GOD !White Rock Is a GOD !White Rock Is a GOD !White Rock Is a GOD !White Rock Is a GOD !
Originally Posted by jfc68660
Do you have a contact telephone or email for him?
Thanks,
John
I pm'd you his email address.
 
  #15  
Old 06-09-2016 | 06:40 PM
justatoy's Avatar
Registered User
Joined: Jan 2008
Posts: 2,370
From: Vancouver
Rep Power: 327
justatoy Is a GOD !justatoy Is a GOD !justatoy Is a GOD !justatoy Is a GOD !justatoy Is a GOD !justatoy Is a GOD !justatoy Is a GOD !justatoy Is a GOD !justatoy Is a GOD !justatoy Is a GOD !justatoy Is a GOD !
I was thinking of this today and why don't you run a boost activated switch.....so that when the engine is under boost it automatically switches to NO resistor(where you say the car runs fine) and when under normal driving it runs off of the resistor!? May not be be what you want to do but should work and pretty easy to do!

Stacy
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
airbusdrvr
Aston Martin
15
04-05-2022 11:56 PM
vbmw335
Automobiles For Sale
11
04-22-2016 03:50 PM
NMSV8V
991
7
03-31-2016 08:05 PM



You have already rated this thread Rating: Thread Rating: 0 votes,  average.

Quick Reply: 997 VF-Engineering Supercharger problem



All times are GMT -6. The time now is 06:21 PM.