Nsfr1206 Posted July 30, 2020 Share Posted July 30, 2020 (edited) I bought another Mack MR with a concrete pump on it and wow is it a dog. It really struggles. I changed air filter and fuel filters and still very weak. I understand it’s got an aset ai 350 in it. Does anybody have a log in and could check whether my computer is up to date? I’ve been told the only way to get more power is to actually change some hard parts, like the camshaft. Being an ai I guess it gulps a little hot air. Is that my only option, to swap parts? Last 6 of vin is 031388 edit- year is 2006 no pyrometer or turbo boost gauge engine fan is very loud and runs a LOT Edited July 30, 2020 by Nsfr1206 Quote Link to comment https://www.bigmacktrucks.com/topic/63534-low-power-help/ Share on other sites More sharing options...
Nsfr1206 Posted July 31, 2020 Author Share Posted July 31, 2020 Yeah I read a lot of that topic. Good info. Truck should be around 56,000. I think the larger 2004 with the 400 at 82,000 or so would outrun it and I know the 2008 with 400 and 56,000 would outrun it. It runs really well. Quote Link to comment https://www.bigmacktrucks.com/topic/63534-low-power-help/#findComment-457222 Share on other sites More sharing options...
Nsfr1206 Posted July 31, 2020 Author Share Posted July 31, 2020 (edited) Mack dealer said it wasn’t possible to turn into a 400 without changing parts. edit- I dropped it off at Mack today and he said it could be reflashed but to really get the power you need to do the camshaft swap etc. So he was going to see if they could turn it up. I picked up my larger truck and it certainly runs better than the 350 even though it weighs a bunch more. He also thinks the 350 is missing a bit so we shall see what’s up. Edited July 31, 2020 by Nsfr1206 Quote Link to comment https://www.bigmacktrucks.com/topic/63534-low-power-help/#findComment-457270 Share on other sites More sharing options...
Macktech20 Posted July 31, 2020 Share Posted July 31, 2020 Have you thought about switching the exhaust manifold, Mack also put a very restrictive exhaust manifold on the AI engines to be able to pass the 2004 EPA restrictions. It might be a little bit cheaper then replacing the cam, if you're looking still looking for power after the dealer turns it up a little bit. Quote Link to comment https://www.bigmacktrucks.com/topic/63534-low-power-help/#findComment-457308 Share on other sites More sharing options...
Nsfr1206 Posted August 1, 2020 Author Share Posted August 1, 2020 Yes. Along with turbo, injectors, and go to 5” exhaust from the 4” to help get rid of back pressure. We will see what happens Monday at the dealer. Maybe it will get woke up. The truck runs a little hotter than my larger one so fan runs and sucks even more power. I hope to get that resolved also. Quote Link to comment https://www.bigmacktrucks.com/topic/63534-low-power-help/#findComment-457314 Share on other sites More sharing options...
Nsfr1206 Posted August 1, 2020 Author Share Posted August 1, 2020 I think he does, he just meant I wouldn’t get the full benefit without changing hard parts. Quote Link to comment https://www.bigmacktrucks.com/topic/63534-low-power-help/#findComment-457330 Share on other sites More sharing options...
Bliue dm Posted August 1, 2020 Share Posted August 1, 2020 Try blowing out radiator... If its a granite. They tend to clog up... Quote Link to comment https://www.bigmacktrucks.com/topic/63534-low-power-help/#findComment-457353 Share on other sites More sharing options...
Nsfr1206 Posted August 1, 2020 Author Share Posted August 1, 2020 6 hours ago, Bliue dm said: Try blowing out radiator... If its a granite. They tend to clog up... It’s an MR. Hopefully figure something out Monday Quote Link to comment https://www.bigmacktrucks.com/topic/63534-low-power-help/#findComment-457384 Share on other sites More sharing options...
Mackpro Posted August 3, 2020 Share Posted August 3, 2020 An AI 350 and 400 are the exact same engine. On a factory HP upgrade No hard parts to change, only download is different. Bumping to 427-460 then your talking turbo and injectors. Only the early Etech ( 1998.5 -2001) needed camshaft key way swap to go to bigger HP. Quote Link to comment https://www.bigmacktrucks.com/topic/63534-low-power-help/#findComment-457521 Share on other sites More sharing options...
Nsfr1206 Posted August 3, 2020 Author Share Posted August 3, 2020 Thanks. They ran the overhead today... thought maybe it would help and help with rough running. It didn’t need much adjustment. They are going to check pressure yet. Quote Link to comment https://www.bigmacktrucks.com/topic/63534-low-power-help/#findComment-457561 Share on other sites More sharing options...
Nsfr1206 Posted August 3, 2020 Author Share Posted August 3, 2020 Which non ai manifold do I need for an MR to swap to free flow and s400 turbo? Will it be the same as the one Log Dog used? Quote Link to comment https://www.bigmacktrucks.com/topic/63534-low-power-help/#findComment-457562 Share on other sites More sharing options...
Nsfr1206 Posted August 3, 2020 Author Share Posted August 3, 2020 They did an injector cut out test or some such thing and it appears I may need all new nozzles. I suggested they change to 460 and change manifold and turbo too. 😄 Quote Link to comment https://www.bigmacktrucks.com/topic/63534-low-power-help/#findComment-457567 Share on other sites More sharing options...
Nsfr1206 Posted August 6, 2020 Author Share Posted August 6, 2020 They’ve changed the injector nozzles. And it still has low power. Fuel pressure test shows good pressure at idle but doesn’t go as high as it should when idled up. Any ideas? Quote Link to comment https://www.bigmacktrucks.com/topic/63534-low-power-help/#findComment-457793 Share on other sites More sharing options...
Nsfr1206 Posted August 8, 2020 Author Share Posted August 8, 2020 They changed the pump at front of engine and the regulator. They also programmed it to 400 from 350. I picked it up today. It’s better but still not as good as my heavier pump. It runs warmer too which doesn’t make much sense to me. What’s my next move? They put stock injector nozzles in. If I change to older style manifold and 5” after turbo will this help with back pressure and maybe some heat? Quote Link to comment https://www.bigmacktrucks.com/topic/63534-low-power-help/#findComment-457944 Share on other sites More sharing options...
Nsfr1206 Posted August 8, 2020 Author Share Posted August 8, 2020 Does this sound right to you guys? IMG_1203.MOV Quote Link to comment https://www.bigmacktrucks.com/topic/63534-low-power-help/#findComment-457953 Share on other sites More sharing options...
Dirtymilkman Posted August 8, 2020 Share Posted August 8, 2020 From the little bit I heard, it sounds like a smooth running etec. Never start listening real hard to an etec. You'll start second guessing everything. Quote Link to comment https://www.bigmacktrucks.com/topic/63534-low-power-help/#findComment-457965 Share on other sites More sharing options...
Nsfr1206 Posted August 8, 2020 Author Share Posted August 8, 2020 1 hour ago, Dirtymilkman said: From the little bit I heard, it sounds like a smooth running etec. Never start listening real hard to an etec. You'll start second guessing everything. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/63534-low-power-help/#findComment-457978 Share on other sites More sharing options...
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