Data to Show Effects of Carbon Build Up?

[911medic]

So, I've been playing around with the Torque app, collecting data from my daily drives back and forth to work. I've started to put the data into Excel spreadsheets, and want to do some graphs of various data points that could show the effects of the carbon build up our DI engines (with no catch can) are subject to.

My car has ~26,000 miles on it with no can, and I'm sure it's got some good sludge on those valves. My plan is to collect some baseline data running 87 octane fuel (done), then some running 93 octane (still to come), then I will investigate/clean the upper induction (and hopefully install a catchcan, if $$$ allows) and repeat the data collection.

But I need to ask those who have greater knowledge than me (ie, everyone), what data points will show a difference? I can collect data on fuel trims, knock retard, timing advance, AFR, and more. Which ones would most demonstrate the effects of the carbon build up? Ideas? I need to narrow the list for graphing purposes, to make it usable.

EDIT: See post #70 for my initial data sets/graphs.

[SC2150]

I am not sure any looging data would show up as it is reducing the CFM of flow (that would be a physical flow bench test) and the volumetric efficiancy of the port and valve tulip design that is changed.

MAP sensor data on the LFX may show a variance, so may show something there. the LLT has no MAP so that dosent help.

I like this thread though.

Here is another compilation of pictures dealing with the issue on all makes of DI engine:
http://isearch.avg.com/images?s=side...snd=hp&pid=avg

[SilverSurfer21]

Originally Posted by 911medic

So, I've been playing around with the Torque app, collecting data from my daily drives back and forth to work. I've started to put the data into Excel spreadsheets, and want to do some graphs of various data points that could show the effects of the carbon build up our DI engines (with no catch can) are subject to.

My car has ~26,000 miles on it with no can, and I'm sure it's got some good sludge on those valves. My plan is to collect some baseline data running 87 octane fuel (done), then some running 93 octane (still to come), then I will investigate/clean the upper induction (and hopefully install a catchcan, if $$$ allows) and repeat the data collection.

But I need to ask those who have greater knowledge than me (ie, everyone), what data points will show a difference? I can collect data on fuel trims, knock retard, timing advance, AFR, and more. Which ones would most demonstrate the effects of the carbon build up? Ideas? I need to narrow the list for graphing purposes, to make it usable.

Your 2LT does not need a catch can. Whoever said you did doesn't know what he is talking about. If you have a V8 and run your car very hard then maybe you can benefit from having one.

[C586]

Originally Posted by SilverSurfer21

Your 2LT does not need a catch can. Whoever said you did doesn't know what he is talking about. If you have a V8 and run your car very hard then maybe you can benefit from having one.

It doesn't need a can but if you can afford it your an idiot if you don't install one.

[SilverSurfer21]

Originally Posted by C586

It doesn't need a can but if you can afford it your an idiot if you don't install one.

Yes and I should buy one of those Vornados to put under my air cleaner so I can double my gas mileage! LOL LOL LOL

[JohnnyBfromPeoria]

Originally Posted by SilverSurfer21

Your 2LT does not need a catch can. Whoever said you did doesn't know what he is talking about.

And your qualifications for saying that are...?

John B.

[christianmotox]

Originally Posted by SilverSurfer21

Your 2LT does not need a catch can. Whoever said you did doesn't know what he is talking about. If you have a V8 and run your car very hard then maybe you can benefit from having one.

Are you serious????????

Do you know how Direct Injection works?

[GretchenGotGrowl]

Originally Posted by SilverSurfer21

Your 2LT does not need a catch can. Whoever said you did doesn't know what he is talking about. If you have a V8 and run your car very hard then maybe you can benefit from having one.

Why would a Port Injected engine need one but not a Direct Injected engine?

[christianmotox]

Originally Posted by SilverSurfer21

Your 2LT does not need a catch can. Whoever said you did doesn't know what he is talking about. If you have a V8 and run your car very hard then maybe you can benefit from having one.

OK you got me. April Fools right?

[SC2150]

LOL!!!! Has to be!

[GretchenGotGrowl]

Except he made a similar comment two days ago.

http://www.camaro5.com/forums/showth...87#post6360487

[intensifi]

Yesterday I witnessed firsthand the need for a catch can while cleaning the intake manifold of my LFX. Tremendous oil and carbon buildup after 14K miles without one.

[SilverSurfer21]

Originally Posted by JohnnyBfromPeoria

And your qualifications for saying that are...?

John B.

31.5 years as GM engineer. You believe all the "snake oil" distributors on the auto scene??? You guys are a riot. You need to use detergent gas and you engine will be just fine. No catch cans! If these were necessary they would be on your cars from the factory!!!

[GretchenGotGrowl]

Originally Posted by SilverSurfer21

31.5 years as GM engineer. You believe all the "snake oil" distributors on the auto scene??? You guys are a riot. You need to use detergent gas and you engine will be just fine. No catch cans! If these were necessary they would be on your cars from the factory!!!

Explain how degergent gas will help on a Directed Injection motor.