LLY / LBZ Mouthpiece Flow Data - Page 22 - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #211 of 218 (permalink) Old 07-23-2014, 09:28 PM
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Is your air filter an oil type? The Duramax at 3000 rpm and 20 pounds of boost will consume the air in an 8x10 room in 1 min. The massive amount of air flow will pull some of the oil from the filter if it is over oiled and get on the mass air flow sensor and cause some strange results. I would try the fuel filter first and a can of MAF cleaner to the sensor if the filter does not help. 11000 is not to bad on the filter but it only takes 1 tank of bad fuel to plug a filter. A change in the shifting is also an indication of fuel filter plugged.

Clifford is a 2005 GMC Loaded SLT 2wd with; true cold air intake mods, ported LBZ turbo inlet mouthpiece, AFE Inter cooler pipe, Diamond Eye down pipe, BD drivers side manifold, V2 radiator, thermostst controlled oil cooler, Edge CTS2, 19.5" aluminum wheels with factory lug covers, Goodyear G647RSS 225/70/19.5, BF Xenon 6000k Headlights Low & Hi, Air lift Remote control 5000# air bag system, Tork Lift Stable Loads, EZ down Tailgate assist, Put co S/S mud flaps, compete interior wood dash kit, Dual Liner 3 piece bed liner with rubber floor mat, Roll-N-Lock tonne cover with tail gate lock, and AVS in channel vent visors.

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post #212 of 218 (permalink) Old 07-24-2014, 06:29 AM
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I do have an oiled filter but its been about 3 months since I cleaned it last and haven't had any problems so I don't think it is an over oiled problem but I'm putting in my lift pump and cat filters as soon as they get here so hopefully early next week and I'm going to delete the factory filter head all together. But where can I buy maf sensor cleaner is it at any auto parts store? I'd like to clean it anyway just because I haven't since I bought the truck. Thanks

2004.5 LLY ccsb
aFe stage 2 cold air and 3" intercooler tubes
5" Magna flow straight pipe and downpipe
EFI Live by Duramaxtuner.com
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Egt/rail pressure /boost gauges
Lbz mouthpiece
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post #213 of 218 (permalink) Old 02-23-2015, 08:15 AM
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post #214 of 218 (permalink) Old 02-23-2015, 10:27 AM
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Its a must for any LLY owner who has not done this easy swap.

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post #215 of 218 (permalink) Old 04-04-2015, 10:36 PM
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Last edited by Wreckneps; 04-04-2015 at 10:40 PM.
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post #216 of 218 (permalink) Old 09-13-2015, 07:08 PM
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05 lly, was backing out of my parking spot put the truck in drive started trying to turn and POP! Now I have no steering.. Help
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post #217 of 218 (permalink) Old 02-12-2017, 07:39 AM
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Great info. Thank you for sharing and thanks for being bored that day and doing the test. Haha

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post #218 of 218 (permalink) Old 07-11-2018, 07:40 PM
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Originally Posted by camdoc View Post
Hi everyone, I thought you might be interested in some flowbench data for the LBZ mouthpiece modification for the LLY engine. I was bored yesterday so I ran a few bits across my flowbench.

This modification is the best thing you can do for an LLY! There is no point in buying a CAI with the stock mouthpiece, it is a terrible restriction. I was also suprised that an air filter with less than 17,000 miles was showing restriction.

The chart shows the flow through the mouthpieces only, then the LLY mouthpiece with only the stock duct, then the entire stock LLY system with a used air filter, then a new air filter. The last column is the LLY / LBZ hybrid complete induction system with a clean air filter.

My bench would only pull 21 In-H2O with the LLY / LBZ hybrid induction system, if you look at the orange columns you can see the benefit of this modification. The entire hybrid system with a filter flows more air than the LLY mouthpiece alone by a large amount.

Thanks for a great website, I took your advice and did this modification, it is the best bang for the buck for any LLY owner!
Camdoc...can you repost the graph if you still have it? I guess something has happened along the way and I can't see it.


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