Mackpro Posted January 10, 2023 Share Posted January 10, 2023 (edited) Actuator removed and gauge installed and arm forward. And the arm touches the black mark on the gauge. Edited January 10, 2023 by Mackpro 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71014-2014-chu-with-an-mp8-seems-to-be-low-on-power-and-boost/page/2/#findComment-520753 Share on other sites More sharing options...
Mackpro Posted January 10, 2023 Share Posted January 10, 2023 Arm to the rear as far as it would go and would not get to the black mark on the gauge. It’s turbo replacement time . 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71014-2014-chu-with-an-mp8-seems-to-be-low-on-power-and-boost/page/2/#findComment-520754 Share on other sites More sharing options...
Onyx610 Posted January 10, 2023 Share Posted January 10, 2023 I have never seen more than 35 psi. However I have heard a lot of talk about 38-40psi so I thought I was wrong… Quote Link to comment https://www.bigmacktrucks.com/topic/71014-2014-chu-with-an-mp8-seems-to-be-low-on-power-and-boost/page/2/#findComment-520755 Share on other sites More sharing options...
Onyx610 Posted January 10, 2023 Share Posted January 10, 2023 Is there a part number on that gauge? Quote Link to comment https://www.bigmacktrucks.com/topic/71014-2014-chu-with-an-mp8-seems-to-be-low-on-power-and-boost/page/2/#findComment-520758 Share on other sites More sharing options...
Mackpro Posted January 10, 2023 Share Posted January 10, 2023 54 minutes ago, Onyx610 said: Is there a part number on that gauge? 88800265. It’s about $63 from Mack 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71014-2014-chu-with-an-mp8-seems-to-be-low-on-power-and-boost/page/2/#findComment-520763 Share on other sites More sharing options...
Mackpro Posted January 10, 2023 Share Posted January 10, 2023 1 hour ago, Onyx610 said: I have never seen more than 35 psi. However I have heard a lot of talk about 38-40psi so I thought I was wrong… I’ve seen a few hit 35 them back off to 33 and be good. I’ll talk to my buddy that has the 505Plus program in a CHU and see what he’s hitting. The only ones I have seen in the 38-40 range had issues with the turbo. Which can be good in some cases if the sticks in the right position. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71014-2014-chu-with-an-mp8-seems-to-be-low-on-power-and-boost/page/2/#findComment-520764 Share on other sites More sharing options...
fjh Posted January 10, 2023 Share Posted January 10, 2023 15 minutes ago, Mackpro said: 88800265. It’s about $63 from Mack So it looks to me they have been using the parts canon to a great degree here! I'm not the guru here how ever! A question for( MP or OXY )do you have to do a learned data reset with a turbo change? Also don't see anywhere where they checked the valve set are Engine brake slaves OK? That said the truck hasn't been asking to frequent regens which would accompany a turbo issue usually! if so wonder if they are doing so! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71014-2014-chu-with-an-mp8-seems-to-be-low-on-power-and-boost/page/2/#findComment-520766 Share on other sites More sharing options...
Onyx610 Posted January 10, 2023 Share Posted January 10, 2023 13 minutes ago, fjh said: So it looks to me they have been using the parts canon to a great degree here! I'm not the guru here how ever! A question for( MP or OXY )do you have to do a learned data reset with a turbo change? Also don't see anywhere where they checked the valve set are Engine brake slaves OK? That said the truck hasn't been asking to frequent regens which would accompany a turbo issue usually! if so wonder if they are doing so! Yes with a new turbo a learned data reset should be performed through PTT. When people post problems and say the dealership is working on their truck I just figure they know this stuff and it was done? I’ve never worked at a dealership so not sure. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71014-2014-chu-with-an-mp8-seems-to-be-low-on-power-and-boost/page/2/#findComment-520767 Share on other sites More sharing options...
fjh Posted January 10, 2023 Share Posted January 10, 2023 12 minutes ago, Onyx610 said: Yes with a new turbo a learned data reset should be performed through PTT. When people post problems and say the dealership is working on their truck I just figure they know this stuff and it was done? I’ve never worked at a dealership so not sure. I to assume they are doing the right things! That said when I see the parts cannon being used I sometimes wonder!? Quote Link to comment https://www.bigmacktrucks.com/topic/71014-2014-chu-with-an-mp8-seems-to-be-low-on-power-and-boost/page/2/#findComment-520768 Share on other sites More sharing options...
Mackpro Posted January 10, 2023 Share Posted January 10, 2023 Always do learned data reset when changing most any engine part. On the newer trucks it’s called Adaptive Factor Reset under calibrations in Tech Tool 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71014-2014-chu-with-an-mp8-seems-to-be-low-on-power-and-boost/page/2/#findComment-520769 Share on other sites More sharing options...
Onyx610 Posted January 10, 2023 Share Posted January 10, 2023 1 minute ago, Mackpro said: Always do learned data reset when changing most any engine part. On the newer trucks it’s called Adaptive Factor Reset under calibrations in Tech Tool Good info, didn’t know you should do that for most things. Quote Link to comment https://www.bigmacktrucks.com/topic/71014-2014-chu-with-an-mp8-seems-to-be-low-on-power-and-boost/page/2/#findComment-520770 Share on other sites More sharing options...
Onyx610 Posted January 10, 2023 Share Posted January 10, 2023 4 minutes ago, fjh said: I to assume they are doing the right things! That said when I see the parts cannon being used I sometimes wonder!? I think that happens more often than not anymore. Not to many guys like Mackpro around that correctly diagnose and pin point the problem. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71014-2014-chu-with-an-mp8-seems-to-be-low-on-power-and-boost/page/2/#findComment-520771 Share on other sites More sharing options...
Onyx610 Posted January 10, 2023 Share Posted January 10, 2023 There’s doctors and then there’s surgeons… 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71014-2014-chu-with-an-mp8-seems-to-be-low-on-power-and-boost/page/2/#findComment-520775 Share on other sites More sharing options...
fjh Posted January 10, 2023 Share Posted January 10, 2023 (edited) 5 minutes ago, Onyx610 said: There’s doctors and then there’s surgeons… Agreed! Some are just nurses ! Some just plain Parts Chuckers! And some times you need to go with your best guess we all been there ! That said comes down to Experiences !More experience more knowledge gained! We had a few guys that had a real decent handle on what the ECU wanted to see and went in search of the parameters before pulling out the Parts cannon and usually even if the engine was deleted could get to a reasonably quick repair! But you have to be reasonably good at listening to what the operator is saying and sometimes they don't reveal the whole story ! We see it here All the time! Only part of the story! Edited January 10, 2023 by fjh 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71014-2014-chu-with-an-mp8-seems-to-be-low-on-power-and-boost/page/2/#findComment-520777 Share on other sites More sharing options...
genoredstar Posted January 11, 2023 Author Share Posted January 11, 2023 When this truck is right boost runs up to 39 to 40 and holds till it starts dropping in the toque curve at 1650 or so . If its hot out , above 85 degrees i see a lil softening of the upper boost to about 38 but almost always above 35 psi. I'm with you on the grey hair and bald spot. nuthin better than talking to experience! Quote Link to comment https://www.bigmacktrucks.com/topic/71014-2014-chu-with-an-mp8-seems-to-be-low-on-power-and-boost/page/2/#findComment-520845 Share on other sites More sharing options...
Onyx610 Posted January 11, 2023 Share Posted January 11, 2023 I like the idea of checking the boost pressure sensor. When exactly did this issue start? After cups? Quote Link to comment https://www.bigmacktrucks.com/topic/71014-2014-chu-with-an-mp8-seems-to-be-low-on-power-and-boost/page/2/#findComment-520856 Share on other sites More sharing options...
Mackpro Posted January 11, 2023 Share Posted January 11, 2023 I guess I should have asked but what year model is the truck and is it deleted now or was that in the past ? And what’s the Hp on the sticker on the valve cover? Quote Link to comment https://www.bigmacktrucks.com/topic/71014-2014-chu-with-an-mp8-seems-to-be-low-on-power-and-boost/page/2/#findComment-520870 Share on other sites More sharing options...
Mackpro Posted January 11, 2023 Share Posted January 11, 2023 I got to test drive the truck I been working on for a couple of days before I went home today. 2012 CXU 445 Econodyne. 10 speed Fuller. New turbo , new EGR differential sensor upgrade kit installed, new EGR temp sensor, no boost leaks, clean DPF with only 1% soot . Pulling a empty but heavy feed trailer . On the interstate coming up the biggest long hill we have around here. I accelerate up the hill and took this pic at 1650 rpms at 72 mph and max boost I got was 33 psi , I hit 75 at the top of the hill. I’m wondering if emission years and HP differences make a big difference in actual max Boost pressure. My buddy who had the 2016 505 Plus program can’t remember his boost numbers in a hard pull. I road with him once to the grainery and we we’re pulling same hill loaded easier that I pulled it with my empty trailer. Gross weight was 101,000 when we weighed at the grain bins. Best pulling Mack I ever road in. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71014-2014-chu-with-an-mp8-seems-to-be-low-on-power-and-boost/page/2/#findComment-520873 Share on other sites More sharing options...
fjh Posted January 11, 2023 Share Posted January 11, 2023 10 hours ago, Mackpro said: I got to test drive the truck I been working on for a couple of days before I went home today. 2012 CXU 445 Econodyne. 10 speed Fuller. New turbo , new EGR differential sensor upgrade kit installed, new EGR temp sensor, no boost leaks, clean DPF with only 1% soot . Pulling a empty but heavy feed trailer . On the interstate coming up the biggest long hill we have around here. I accelerate up the hill and took this pic at 1650 rpms at 72 mph and max boost I got was 33 psi , I hit 75 at the top of the hill. I’m wondering if emission years and HP differences make a big difference in actual max Boost pressure. My buddy who had the 2016 505 Plus program can’t remember his boost numbers in a hard pull. I road with him once to the grainery and we we’re pulling same hill loaded easier that I pulled it with my empty trailer. Gross weight was 101,000 when we weighed at the grain bins. Best pulling Mack I ever road in. Good possibility the boost sensor could change the Game! We accidently installed a MP 8 boost sensor in an MP10 once ! That truck turned from mild mannered Clark Kent to Super man in an instant ! It was a low bed tractor that you could pull stumps with! Truck was still under warranty so we didn't leave it like that but it was and Eye opener! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71014-2014-chu-with-an-mp8-seems-to-be-low-on-power-and-boost/page/2/#findComment-520900 Share on other sites More sharing options...
Glensts Posted March 15, 2023 Share Posted March 15, 2023 2016 chu 505hp our 2013 only gets 35psi Quote Link to comment https://www.bigmacktrucks.com/topic/71014-2014-chu-with-an-mp8-seems-to-be-low-on-power-and-boost/page/2/#findComment-527269 Share on other sites More sharing options...
bts-4120 Posted April 27, 2023 Share Posted April 27, 2023 2015 mp8 505c gets 39 pounds of boost and holds it 1 Quote Link to comment https://www.bigmacktrucks.com/topic/71014-2014-chu-with-an-mp8-seems-to-be-low-on-power-and-boost/page/2/#findComment-530111 Share on other sites More sharing options...
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