GOOG Posted October 1, 2015 Share Posted October 1, 2015 My 1993 400 only makes 15 lbs of boost. That seems low to me. I have other (newer) trucks that make 35. I checked for leaks in the cooler, had none. Does anybody know what the boost should be? The truck does seem a little down on power. Quote Link to comment https://www.bigmacktrucks.com/topic/42012-how-much-boost/ Share on other sites More sharing options...
Glensts Posted October 2, 2015 Share Posted October 2, 2015 My Electronic 95 350 makes 20 lbs boost. My 97 427's make 28-33 lbs of boost.I thought 20 was low too but it is the specs of Mack and it pulls great. Service manager gave me the specs as we thought we had issues as well.Gauges arent all they are cracked up to be either, I'd check gauge and see what specs are before trying anything else. Quote Link to comment https://www.bigmacktrucks.com/topic/42012-how-much-boost/#findComment-305908 Share on other sites More sharing options...
Mackpro Posted October 2, 2015 Share Posted October 2, 2015 A 93 400 VMAC should be around 24-32 psi of boost according to the 1993 Mack tune up book. Maybe blown intake gaskets. They now have steel core intake gaskets Quote Link to comment https://www.bigmacktrucks.com/topic/42012-how-much-boost/#findComment-305938 Share on other sites More sharing options...
blackdog2 Posted October 3, 2015 Share Posted October 3, 2015 What psi dose e-6 350 4 valve should have. Quote Ed Link to comment https://www.bigmacktrucks.com/topic/42012-how-much-boost/#findComment-305994 Share on other sites More sharing options...
gearhead204 Posted October 3, 2015 Share Posted October 3, 2015 the e6-350's that I have ran were around 28-32 lbs. on a hard pull Quote Link to comment https://www.bigmacktrucks.com/topic/42012-how-much-boost/#findComment-306007 Share on other sites More sharing options...
Dirtymilkman Posted October 3, 2015 Share Posted October 3, 2015 I think my 350 e6 pulls 26 Quote Link to comment https://www.bigmacktrucks.com/topic/42012-how-much-boost/#findComment-306013 Share on other sites More sharing options...
Vladislav Posted October 3, 2015 Share Posted October 3, 2015 Might be a stupid question but to each his own.What psi boost E6-350 should have when bobtailing?Sure no load but with a full throttle at a midlle rev range it never takes more that 8 psi.Generally in a flat road I see from 0 to 3. Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/42012-how-much-boost/#findComment-306016 Share on other sites More sharing options...
leversole Posted October 3, 2015 Share Posted October 3, 2015 The most I can get out of mine is 18-20Sent from my iPhone using Tapatalk 1 Quote Link to comment https://www.bigmacktrucks.com/topic/42012-how-much-boost/#findComment-306030 Share on other sites More sharing options...
Mackpro Posted October 3, 2015 Share Posted October 3, 2015 Specs on a E6 4 valve head are 19-27 psi of boost at full load 1 Quote Link to comment https://www.bigmacktrucks.com/topic/42012-how-much-boost/#findComment-306037 Share on other sites More sharing options...
1MACK1 Posted November 6, 2015 Share Posted November 6, 2015 That would be about right Brand new 631GC5117 turbo as per Mack specs All systems good Pulling tri axle trailer and grossing 41000 kg. / 90000 lb ? On a continued pull I get 28-29 psi And surprise a lot of new trucks when I pull past them And still get 2.47 km per litre Iam happy with that 2 Quote Link to comment https://www.bigmacktrucks.com/topic/42012-how-much-boost/#findComment-310178 Share on other sites More sharing options...
Vladislav Posted November 6, 2015 Share Posted November 6, 2015 The most I can get out of mine is 18-20Sent from my iPhone using TapatalkI was wrong.My E6-350 makes up to 8-10 on a flat bobtailing.Recently I put a full throttle uphill on the top gear doing 50 MPH and saw 20 pci of boost. Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/42012-how-much-boost/#findComment-310287 Share on other sites More sharing options...
farmer52 Posted November 7, 2015 Share Posted November 7, 2015 1993 E7-400 V-MAC spec is 24-32psi. Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment https://www.bigmacktrucks.com/topic/42012-how-much-boost/#findComment-310311 Share on other sites More sharing options...
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