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Old 09-22-2009, 11:20 AM   #35
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Guys I don't want this to get out of hand so lets Please stick to the facts only.

I will be data logging the effects of the cold air kits on the Maf Transfer function and the fuel trims for each system.

I will also Clear the computers Memory, before each kit, then do a drive cycle to let the computer adjust then make as many pulls as necessary to stablize the results.

A/F will be monitored for each system.

The only thing that affects A/F is the Maf Transfer Function, If the Maf transfer function is altered severely it throws off all the fueling and the timing calculations, I already know what to expect and will be watching this closely.

I was down this road 15 years ago with the LT1s and aftermarket mafs and cold air kits.

You will have to trust my experience in collecting solid data.
No problem Ted. I'm very much looking forward to what you come up with, and a HUGE thankyou for doing this! If it was practical for me to be there I'd sure be happy to volunteer to help you. You're not getting paid to do any of this and you don't even make a CAI to make some sales from. I totally respect your enthusiasm and what you're doing here!
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Old 09-22-2009, 11:32 AM   #36
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Old 09-22-2009, 11:33 AM   #37
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...You will have to trust my experience in collecting solid data.
can't wait to see the results! Thanks for the time/efforts your investing on our behalf.
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Old 09-22-2009, 11:54 AM   #38
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OK great, now all these companies that were talking about testing can put up or shut up! I eagerly await the results!
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Old 09-22-2009, 12:00 PM   #39
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I hated the stock airbox and elbow. I bought a CAI for the looks, that is it! 1 - 15 "probable" increase in HP is just a bonus to me.
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Old 09-22-2009, 12:14 PM   #40
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I will send in my lmr intake if Andy will send me one of his street versions..
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Old 09-22-2009, 03:37 PM   #41
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If you purchase a CAI,, is it worth it to get a aftermarket MAF as well? What bennefits would I see?
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Old 09-22-2009, 03:56 PM   #42
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Originally Posted by JANNETTYRACING View Post
Guys I don't want this to get out of hand so lets Please stick to the facts only.

I will be data logging the effects of the cold air kits on the Maf Transfer function and the fuel trims for each system.

I will also Clear the computers Memory, before each kit, then do a drive cycle to let the computer adjust then make as many pulls as necessary to stablize the results.

A/F will be monitored for each system.

The only thing that affects A/F is the Maf Transfer Function, If the Maf transfer function is altered severely it throws off all the fueling and the timing calculations, I already know what to expect and will be watching this closely.

I was down this road 15 years ago with the LT1s and aftermarket mafs and cold air kits.

You will have to trust my experience in collecting solid data.

I cant wait til you log fuel trims!

90% of the aftermarket cold air kits require programming to get the trims back in line.

This week Ive tuned a hennesey, rotofab and a ADM. And maf transfer tuning was needed.
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Old 09-22-2009, 04:13 PM   #43
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Old 09-22-2009, 05:44 PM   #44
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TED
If you purchase a CAI,, is it worth it to get a aftermarket MAF as well? What bennefits would I see?
Aftermarket meters are not needed unless you make enough power to max out the meter should be somewhere around 800+ to max out the meter.

A change in the housing changes how the meter reads, so you could potentially take the same meter to maybe 900+ in a bigger housing.

Ted.
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Old 09-22-2009, 05:46 PM   #45
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I cant wait til you log fuel trims!

90% of the aftermarket cold air kits require programming to get the trims back in line.

This week Ive tuned a hennesey, rotofab and a ADM. And maf transfer tuning was needed.
Would you mind sharing, PM me or call 203-753-7223
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Old 09-22-2009, 06:45 PM   #46
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Quote:
Originally Posted by Mike TexaSS View Post
I cant wait til you log fuel trims!

90% of the aftermarket cold air kits require programming to get the trims back in line.

This week Ive tuned a hennesey, rotofab and a ADM. And maf transfer tuning was needed.
Can you please elaborate? I am not trying to be smarta$$, just want to understand this. Thanks.
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Old 09-22-2009, 07:57 PM   #47
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Can you please elaborate? I am not trying to be smarta$$, just want to understand this. Thanks.
OK, A Mass Air meter is calibrated in its original pipe/Air box in a Lab, X mass of air produces X Hz signal, the computer program has this information stored in what we call the Maf Transfer Function or Maf Calibration table.

When ever a Mass air meter is moved to another size, Shape, bend, pipe or exposed to another style air filter, 1 of 2 things happens, X Mass of air produces either less or more of a Hz signal.

The computer inturputes this as Less or More air respectively, and fueling is almost totally reliant on this signal.

Lets say we move more air but produce less Hz signal, this would cause a lean condition that the Fuel trims would have to make up for this by adding fuel initially in the short terms then stored permanately in the Long terms.

So If you look at your Long terms you can pretty much tell by what percent the Maf Transfer function is Skewed.

Now this also affects way more than just the fuel trims, it affects what I call the load calculations, which in turn affect where on the timing table the computer will select the timing cell with a number in it.

If you have ever looked at a timing table they typically have less timing at higher loads and more timing at lower loads.

So if above example would take place the computer would not reach the actual load value and select and higher timing value leading to the knock sensors pulling more timing.

I can't begin to tell you how complex this really is but this is a very short version of what happens when you change out your air box and move the mass air meter.

More air still means more power But the computer must be calibrated to maximize the benefits.

Years ago, the calibrations were no where near as complex and accurate as they are today, and the aftermarket cashed in on this with simple bolt ons to clean up already very rich or lax timing calibrations, and it worked quite well.

The cars and computers today are much more complex and much more accurate than I have ever seen in the past.

It was common to find 20-25 hp in a tune alone, Not today we only see 5-10 available and have to work pretty hard to get it.

Hope this answers your questions.
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Old 09-22-2009, 08:02 PM   #48
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I should also Add,

Just because the mass air meter produces less or more of a Hz signal does not mean you are moving less or more air.

I has to do with location, turbulance, what side of the pipe the air favors, temp, etc.

If you could rotate the maf every clock position you would get different readings because of fluid dynamics.
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Old 09-22-2009, 08:11 PM   #49
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I cant wait til you log fuel trims!

90% of the aftermarket cold air kits require programming to get the trims back in line.

This week Ive tuned a hennesey, rotofab and a ADM. And maf transfer tuning was needed.
Exactly, I am glad someone is deciding to do this. I will make sure one ships out tomorrow.
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Old 09-22-2009, 08:27 PM   #50
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Ted,
Let me know when you decided to do the testing. I'd love to come by and watch. If you need a car to use, I should have mine next week!! I'll be speaking with you soon.



Jamie
Thanks for Offering your car up, I may have to take you up on that, I will let you know if the other car falls through.

Ted.
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Old 09-22-2009, 08:29 PM   #51
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Exactly, I am glad someone is deciding to do this. I will make sure one ships out tomorrow.
Thank you LMR, that is 3 solid commitments, anyone else?

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