GOOG Posted October 30, 2015 Share Posted October 30, 2015 My 1993 Superliner with a 400 HP Mack is about 12 pounds down on boost. Making under 20 pounds my other trucks make 31-36. Tested it last night and found a pretty big leak in the charge air cooler. I ordered a cooler from Mack today. So, the big question is , how much power am I losing due to the lack of boost? I think at least 100 HP. A third of the boost has to cost a quarter of the power. (McDonalds math) Quote Link to comment https://www.bigmacktrucks.com/topic/42433-whats-12-lbs-worth/ Share on other sites More sharing options...
gearhead204 Posted October 31, 2015 Share Posted October 31, 2015 well using the same math, all I can say is you wont have a proper BIG MACK! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/42433-whats-12-lbs-worth/#findComment-309425 Share on other sites More sharing options...
GOOG Posted October 31, 2015 Author Share Posted October 31, 2015 You lost me. Quote Link to comment https://www.bigmacktrucks.com/topic/42433-whats-12-lbs-worth/#findComment-309429 Share on other sites More sharing options...
Freightrain Posted October 31, 2015 Share Posted October 31, 2015 McDonald makes the "Big Mac" sandwich. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/42433-whats-12-lbs-worth/#findComment-309431 Share on other sites More sharing options...
dds92780 Posted October 31, 2015 Share Posted October 31, 2015 Usually 10 hp for every pound off boost. But I doubt its true. I feel like my mack maybe makes 460 or over but im not sure. I make 43 pounds by 1200 rpm in my rd. To be honest it doesnt really even make a difference having all that power when you only got a 9 speed and have to worry about using too much fuel or boost at a low rpm in overdrive. Sorry about the rant, but I think you lost at least 100 hp Quote Slow and Steady Wins the Race! Link to comment https://www.bigmacktrucks.com/topic/42433-whats-12-lbs-worth/#findComment-309446 Share on other sites More sharing options...
GOOG Posted October 31, 2015 Author Share Posted October 31, 2015 I just put the truck to work, so I don't know how much boost it should make. I think it will be in the neighborhood of 31-36 lbs. I've heard it said that every 15 lbs. doubles the HP. So, if it takes 36 lbs. to make 400, and I have about half that, is it safe to say I'm 50% off in power? Quote Link to comment https://www.bigmacktrucks.com/topic/42433-whats-12-lbs-worth/#findComment-309554 Share on other sites More sharing options...
BOB DINGSDALE Posted October 31, 2015 Share Posted October 31, 2015 with that much lost boost I'd say your awful low in power on a adverse Quote Link to comment https://www.bigmacktrucks.com/topic/42433-whats-12-lbs-worth/#findComment-309556 Share on other sites More sharing options...
GOOG Posted October 31, 2015 Author Share Posted October 31, 2015 I took a 61,000 lb. crusher to Leesport, Penn. on Wed. The hills on 78 knocked me for a loop. The truck ran like it had a 237 in it instead of a 400. Whatever the HP loss is, I believe it's dramatic. I'll know Monday. Quote Link to comment https://www.bigmacktrucks.com/topic/42433-whats-12-lbs-worth/#findComment-309557 Share on other sites More sharing options...
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