Baller Roger Posted August 10, 2015 Baller Share Posted August 10, 2015 I drove 2 hours of practice on Sunday for Nationals and had a 5.3 liter Nautique for the 1st hour. It seemed to have similar power to the 6 liter boats I've been driving lately and the skiers all said it felt great. Changed to a 6 liter and felt about the same with the only real difference being the exhaust note. Haven't driven the 6.2 liter boat yet, but I'm driving practice several more times this week, so hopefully I'll get one. Link to comment Share on other sites More sharing options...
Baller bkreis Posted August 10, 2015 Baller Share Posted August 10, 2015 my 2016 5.3 200 is on it's way! can't wait!! Link to comment Share on other sites More sharing options...
Baller webbdawg99 Posted August 10, 2015 Baller Share Posted August 10, 2015 I'm not worried about the 5.3 as a slalom boat. I'm most curious how it will perform pulling 150+ jumpers. Link to comment Share on other sites More sharing options...
Baller Roger Posted August 10, 2015 Author Baller Share Posted August 10, 2015 I don't pull jump, but I'll see if they're using one for practice when I'm out there Wednesday and see what the opinions are. Link to comment Share on other sites More sharing options...
DooSPX Posted August 10, 2015 Share Posted August 10, 2015 I am not up on SN as I should be, I didn't know they or PCM came out with a Marine 5.3 LS based engine. I didn't see it on PCM's site. Link to comment Share on other sites More sharing options...
Baller webbdawg99 Posted August 10, 2015 Baller Share Posted August 10, 2015 @DooSPX I haven't seen it on PCM's page either. However, if you go to GM marine engines, there is a new 5.3 listed. I assume this is the same engine.....assume. Link to comment Share on other sites More sharing options...
DooSPX Posted August 10, 2015 Share Posted August 10, 2015 @webbdawg99 Interesting. I can't gather why they would use AFM in a marine application. I don't see cylinder DE-activation as a good idea in boats. Especially in tow boats. Not to mention the lifters used in AFM engines do not have the best track record. Link to comment Share on other sites More sharing options...
Baller GAJ0004 Posted August 10, 2015 Baller Share Posted August 10, 2015 How fast from 0-36, and distance to 36 MPH? If you get a chance to check that out please post it. Link to comment Share on other sites More sharing options...
Baller wtrskior Posted August 10, 2015 Baller Share Posted August 10, 2015 lots of guys deleting the AFM on their trucks so it should be easy to do. I agree not something I would care for in a tow boat where holeshot is so important. Link to comment Share on other sites More sharing options...
Baller swc5150 Posted August 10, 2015 Baller Share Posted August 10, 2015 Just an assumption, but wouldn't think PCM would have the AFM system operating on these engines. It would make no sense on a tow boat. Link to comment Share on other sites More sharing options...
Baller oldjeep Posted August 10, 2015 Baller Share Posted August 10, 2015 Makes all sorts of sense in a tow boat. Deactivate half the cylinders during the 50%+ of time that the boat is just idling. Link to comment Share on other sites More sharing options...
Baller Dacon62 Posted August 10, 2015 Baller Share Posted August 10, 2015 Am sitting in my 2014 5.3 truck with AFM right now. It idles in V8 mode. Link to comment Share on other sites More sharing options...
Baller swc5150 Posted August 10, 2015 Baller Share Posted August 10, 2015 My 5.3 did the same; idle in V8 mode. Perhaps that would make sense, but that's not how AFM operates. Link to comment Share on other sites More sharing options...
Baller GMC Posted August 11, 2015 Baller Share Posted August 11, 2015 GenV engines can idle in 4 cylinder mode. Pretty sure that all of them have AFM too, including the LT4. There isn't a non-AFM choice to offer this market. Link to comment Share on other sites More sharing options...
DooSPX Posted August 11, 2015 Share Posted August 11, 2015 @GMC sure there is. Do like they used to do for the marine industry.... Actually swap engine comments when setting up a engine for marine use. Now, a lot just swap electrical comments and fuel comments and that's it. I have already helped swap lifters and de-activate AFM in trucks and the DoD G8. Also know of a few that the lifters sheet the bed per say with low miles. Also, AFM is a joke. All real world driving of the AFM vs no AFM cars and trucks do NOT see any notable decrease in MPG. Also, while DI can make a more powerful and more efficient system, have you seen a DI engine after 100k miles? Yikes. I have seen VW and BMW DI engines. I'm not sold on the long term use of DI and AFM/DoD etc. Link to comment Share on other sites More sharing options...
Baller GMC Posted August 11, 2015 Baller Share Posted August 11, 2015 Well of course hardware change is an option but they obviously don't think it's worth it to redesign the valvetrain for a market of this size despite the mark up. AFM (just like Ecoboost, start/stop, etc) works where it has to... on the fuel economy tests for the window sticker. Given the fixed timing of the intake vs. exhaust valves I would expect thsee engines to do better than a twin cam/dual independent setup like the VWs with respect to carbon buildup on the intake valves. Time will tell. Link to comment Share on other sites More sharing options...
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