7.3 vs 6.6 - Ford Powerstroke Diesel Forum
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Old 12-31-2007, 11:02 AM
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7.3 vs 6.6

Ive been looking into some mods for my dads 05 d-max. And there is alot of talk back and forth in the gm group about if there is any benefit for CAI systems on there trucks. The claim is the factory intake moves enough air for up to 450hp or more and a cai is a waste of money. I believe are 7.3s benefit from CAI but is there that much of a difference between the two trucks and is there any tests we can look at for are 7.3. The 6.6 forums have alot of information on this. theres no dought im going to change mine but i was just wondering what the orgs take on this is. Thanks
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Old 12-31-2007, 11:05 AM
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The difference is from the stock intakes. The 7.3 intakes leave a lot of room for improvement, and CAI help a lot. I have no idea with the GM's, but the 6.0 has a great intake from the factory, but many still upgrade it.
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Old 12-31-2007, 11:07 AM
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Factory intake is fine...

For a DMAX just go with PPE or EFI, straight piped 4" or more exhaust and you're set.

I'd also recommend looking at the tranny when adding that power.
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Old 12-31-2007, 11:24 AM
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Maintain He wants a predator for a towing tune and a cat back 4" mbrp he has a extended warranty on the rig and is worried about that so he doesnt want to straight pipe it. The truck only has 11,000 on it its a garage queen it only pulls the 36' jayco fifth. What tranny stuff you talking about ive also talked him into pyro and boost guages.Some of the tests ive seen says the best CAI they have found is AFE flows 20% more air but am i correct in thinking the turbo is only going to take in so much air and put out so much Thanks
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Old 12-31-2007, 01:11 PM
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im goin to get the ais intake for my psd. they seem to be the best in filtration and they still flow more than stock. i dont know alot about dmax mods tho.
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Old 01-01-2008, 04:46 AM
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That is a thought for the money the AIS is cheaper than the AFE for my early 99 wonder how the two compare with each other
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Old 01-01-2008, 04:54 AM
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Quote:
Originally Posted by powerplant View Post
Ive been looking into some mods for my dads 05 d-max. And there is alot of talk back and forth in the gm group about if there is any benefit for CAI systems on there trucks. The claim is the factory intake moves enough air for up to 450hp or more and a cai is a waste of money. I believe are 7.3s benefit from CAI but is there that much of a difference between the two trucks and is there any tests we can look at for are 7.3. The 6.6 forums have alot of information on this. theres no dought im going to change mine but i was just wondering what the orgs take on this is. Thanks

ISO 5011 Duramax Air Filter Test Report
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Old 01-01-2008, 05:09 AM
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yes ive read it still not convinced guess its a psd thing my mind is brain washed that you have to have a CAI. Thanks.
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Old 01-04-2008, 03:30 PM
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that was a great post.
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Old 01-06-2008, 12:45 PM
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if you go with a aftermarket CAI the AFE is the best for the Duramax but you really don't bennefit from one untill you hit into the 425-450RWHP range..if he goes with the Diablo just tell him to keep it below 80-90HP and he'll be fine with the stock tranny..
the best programmer for the Duramax IMO is the PPE..
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