Duramax Diesels Forum Truck of the Week
  #1  
Old 04-30-2019, 12:57 PM
DreksDmax DreksDmax is offline
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Default Stock air box vs CAI

2008 LMM. After lots of research it seems the stock air box flows just fine for up to 500hp. I had a Cummins in the past and did turbo back, CAI and tune but with this one I’m wanting to stay smog legal but with some pep. I already have the edge CS2, and DPF back exhaust on the way. Is there any other little things that can be done or should be done to help pick up some extra ponies? I’ve seen the air box mod, is that worth anything?

Thanks in advance

Last edited by DreksDmax; 04-30-2019 at 12:57 PM. Reason: Forgot something
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Old 04-30-2019, 01:45 PM
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Not worth it. Throw a 50hp tune in it and drive it.
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Old 04-30-2019, 02:08 PM
DreksDmax DreksDmax is offline
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Originally Posted by hondarider552 View Post
Not worth it. Throw a 50hp tune in it and drive it.
Yea I have the 130hp tune on it now. And it was a nice pick me up
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Old 04-30-2019, 02:16 PM
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have a Transgo Jr installed to try and save that trans. There’s a good chance you aren’t even holding fuel rail pressure with that tune as it is. If you want more performance work on getting the power to the ground. If you do get a CAI make sure it’s sealed not getting air from under the hood.
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Old 04-30-2019, 02:45 PM
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See what IdahoRob has to say about S&B Intakes. They dyno'd before & after on an LBZ and gained 25hp. Follow the link...

https://www.atptrucks.com/articles/a...-reviews-valid
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Old 04-30-2019, 02:54 PM
DreksDmax DreksDmax is offline
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Originally Posted by gmduramax View Post
have a Transgo Jr installed to try and save that trans. Thereís a good chance you arenít even holding fuel rail pressure with that tune as it is. If you want more performance work on getting the power to the ground. If you do get a CAI make sure itís sealed not getting air from under the hood.
I paid for the century 4 year warranty so Iíll roll with the trans for now. Thanks for your input
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Old 04-30-2019, 02:58 PM
DreksDmax DreksDmax is offline
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Originally Posted by BoiseRob View Post
See what IdahoRob has to say about S&B Intakes. They dyno'd before & after on an LBZ and gained 25hp. Follow the link...

https://www.atptrucks.com/articles/a...-reviews-valid
Very interesting. Which s&b intake is that?
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Old 05-01-2019, 06:34 AM
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Leave it stock, the LMM's have awesome intake air temps it will only let more hot air in and more than likely more dirt with a aftermarket one. The old body style trucks had hotter intake air temps and if you get a good intake it can help those but some come with the expense of more dirt or a oiled MAF sensor.

Find a the old write up about making the stock one better.
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Last edited by rcr1978; 05-01-2019 at 06:50 AM. Reason: victim of auto correct
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Old 05-01-2019, 07:05 AM
DreksDmax DreksDmax is offline
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Quote:
Originally Posted by rcr1978 View Post
Leave it stock, the LMM's have awesome intake air temps it will only let more hot air in and more than likely more dirt with a aftermarket one. The old body style trucks had hotter intake air temps and if you get a good intake it can help those but some come with the expense of more dirt or a oiled MAF sensor.

Find a the old write up about making the stock one better.
My IAT range from about 10-15į hotter then outside air while driving. Iíve seen a lot of people say aftermarket and they are within 5į of outside air temps. If I got one I would get one with enclosed air box. Iíve seen the mods for stock air box, taking the turbine blades out and taking that panel off the passenger filter.some say it makes turbo a little louder, some say they had cooler IATs and others say doesnít do anything. So left me not really knowing lol
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Old 05-01-2019, 04:46 PM
DreksDmax DreksDmax is offline
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Did the air box mod and now IATs are only 2-4į difference from outside temps but that’s only thing I notice
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Old 05-01-2019, 05:38 PM
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Quote:
Originally Posted by DreksDmax View Post
Did the air box mod and now IATs are only 2-4į difference from outside temps but thatís only thing I notice
I have red that for every 1 deg decrease in IAT there is aprox 2 rwhp gain , so if you decreased your IAT by 10 deg that would be 20 rwhp gain and maybe 1/2 mpg increase if that is what you were looking for and you are happy that is all that matters . Welcome !
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Old 05-01-2019, 06:18 PM
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Quote:
Originally Posted by torqued2dmax View Post
I have red that for every 1 deg decrease in IAT there is aprox 2 rwhp gain , so if you decreased your IAT by 10 deg that would be 20 rwhp gain and maybe 1/2 mpg increase if that is what you were looking for and you are happy that is all that matters . Welcome !
Good to know. I wonder if the s&b would be much different other then making the turbo louder. I would think there would be better throttle response at least with an aftermarket
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Old 05-02-2019, 04:40 AM
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I had a s&b on my lmm. I honestly didnít notice any difference. Even resonator deleteís I didnít notice anything. Same thing deleting the resonator on my lml. I have a sdp metal intake on my lml now. The only thing I can hear now is it really sucking airflow in. Stock turbo doesnít have any compressor whistle
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Old 05-02-2019, 05:32 AM
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Stock box...
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Old 05-02-2019, 06:27 AM
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Quote:
Originally Posted by DreksDmax View Post
Did the air box mod and now IATs are only 2-4į difference from outside temps but thatís only thing I notice
Not going to beat that with anything aftermarket
Throttle response won't improve either with aftermarket junk only way to get that is with tuning= turbo spooling faster.
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