Vararam & other CAIs: Are you addressing the erratic MAF signals they generate?

[Jeanius]

Originally Posted by Jeanius

Can you please explain why its bad?

I had my car tuned and still have the bucking going on, my tuner is going to do some street tuning to try and fix it

Bump for an answer

[iwanttogofastNY]

Bump

[JANNETTYRACING]

Originally Posted by Jeanius

Bump for an answer

The MAF signal is probably the single most important of all the sensors connected to the computer.

The air that passes by the MAF should be smooth, there should be no turbulence, and should be consistent throughout the pipe, meaning more air flow should not hug one side of the pipe missing the sensor.

Mass air Meters need to have several inches of pipe before and after the sensor to produce clean smooth readings.

Mass Air Meters are extremely sensitive and will measure turbulence as air flow when it may be more or less than actual air flow.

The MAF signal is directly responsible for Selecting the appropriate injector pulse width and Timing, calculating torque, and engine load.

If the signal is erratic then timing and injector pulse width is erratic causing what guys call bucking.

When I ran my Cold Air Test I reported this to a small extent.

Also CAIs that have high Fuel Trims will also select wrong injector pulse width and timing, and load values and calculate torque wrong, especially important for A6 Cars.

Ted.

[Levi_Engle]

But the Vararam doesn't require a tune IF??

[live2well]

Ok OP.....Maybe I missed it but what is the solution to this issue YOU have brought to OUR attention?

[Jeanius]

Originally Posted by JANNETTYRACING

The MAF signal is probably the single most important of all the sensors connected to the computer.

The air that passes by the MAF should be smooth, there should be no turbulence, and should be consistent throughout the pipe, meaning more air flow should not hug one side of the pipe missing the sensor.

Mass air Meters need to have several inches of pipe before and after the sensor to produce clean smooth readings.

Mass Air Meters are extremely sensitive and will measure turbulence as air flow when it may be more or less than actual air flow.

The MAF signal is directly responsible for Selecting the appropriate injector pulse width and Timing, calculating torque, and engine load.

If the signal is erratic then timing and injector pulse width is erratic causing what guys call bucking.

When I ran my Cold Air Test I reported this to a small extent.

Also CAIs that have high Fuel Trims will also select wrong injector pulse width and timing, and load values and calculate torque wrong, especially important for A6 Cars.

Ted.

As always Ted, Thanks for your help!

Can the "bucking" cause damage?

[JANNETTYRACING]

Originally Posted by Jeanius

As always Ted, Thanks for your help!

Can the "bucking" cause damage?

Your Welcome.

Yes it Shakes your Brain and drives you crazy.

[Jeanius]

Originally Posted by JANNETTYRACING

Your Welcome.

Yes it Shakes your Brain and drives you crazy.

[SK360]

There is really no such thing as a "No Tune Intake" Anytime you are changing the flow characteristics of your intake tract it is going to throw your MAF Calibration off.

Just some will give smoother MAF readings then others (Has nothing to do with the tune)

[Dr Jkel]

Originally Posted by JANNETTYRACING

The MAF signal is probably the single most important of all the sensors connected to the computer.

The air that passes by the MAF should be smooth, there should be no turbulence, and should be consistent throughout the pipe, meaning more air flow should not hug one side of the pipe missing the sensor.

Mass air Meters need to have several inches of pipe before and after the sensor to produce clean smooth readings.

Mass Air Meters are extremely sensitive and will measure turbulence as air flow when it may be more or less than actual air flow.

The MAF signal is directly responsible for Selecting the appropriate injector pulse width and Timing, calculating torque, and engine load.

If the signal is erratic then timing and injector pulse width is erratic causing what guys call bucking.

When I ran my Cold Air Test I reported this to a small extent.

Also CAIs that have high Fuel Trims will also select wrong injector pulse width and timing, and load values and calculate torque wrong, especially important for A6 Cars.

Ted.

Ted,
I just ordered a Cold Air Industries cai based on your test. These problems that everyone is talking about, is this on all CAI or just select ones, will I notice any problems with this intake. Thanks John

[Icntdrv55]

Originally Posted by JANNETTYRACING

Your Welcome.

Yes it Shakes your Brain and drives you crazy.

Ted, do you beleive this MAF issue to be present on the Vararam ? I know you have seen and tested them. What are your thoughts on it?

[Russell James]

With a cold air intake, and a hand held tuner like a Predator, what would you look at in the diagnostic data while it is idling to see if your MAF readings are good?

And then if a bit out of whack, is there any of the adjustable items a user could tinker with - or is that done strictly through custom tuning?

[JANNETTYRACING]

Originally Posted by Dr Jekel

Ted,
I just ordered a Cold Air Industries cai based on your test. These problems that everyone is talking about, is this on all CAI or just select ones, will I notice any problems with this intake. Thanks John

This Problem does Not exist on CAI, ADM, Halltech, Rotofab, Airaid, or AFE, Possibly others but Not Sure so I can't comment.

The shorter the MAF Pipe and the closer to the TB the bigger the Problem.

Every time an Intake valve opens it sends both a Pressure wave and sound wave back up the intake manifold, and if the MAF is too close to the TB it sees it as both positive and negative air flow, generating what looks like erratic MAF signals affecting driveability.

Ted.

[JANNETTYRACING]

Originally Posted by Russell James

With a cold air intake, and a hand held tuner like a Predator, what would you look at in the diagnostic data while it is idling to see if your MAF readings are good?

And then if a bit out of whack, is there any of the adjustable items a user could tinker with - or is that done strictly through custom tuning?

I doubt the datalogger on the Predator is fast enough, I could be wrong here, But we see it clearly with HP tuners VCM Suite.

Ted.