blackdoublestack Posted February 2, 2008 Share Posted February 2, 2008 I recently got the rods and mains replaced on the old girl (2001 CH613 460xt Pedigree) it dynoed at 374 hp to the wheel. Well, the 460 xt is rated at 493 and the wheel hp should be 394. I was thinking about getting high torque injectors, 20%. Has anyone bought these injectors from northwest truck in Edmonton, Canada.Is there any other tricks out there to get the ponys out of this motor? Quote Link to comment Share on other sites More sharing options...
Gambi80 Posted February 3, 2008 Share Posted February 3, 2008 I thought the advertised HP on Mack trucks was what its rated at the wheels....E7-427=427 at the wheel and so on....? Quote Ever wonder how a blind person knows when to stop wiping? Link to comment Share on other sites More sharing options...
Mackpro Posted February 4, 2008 Share Posted February 4, 2008 HP is at the flywheel on Macks. On the dyno Mack had the" 80/20" rule. You should get 80% at the wheels, lose 20% through the drive train. Last week we had a 2006 CV with a 460 and it only put out 322HP at the wheels which was very low, should have been around 365. Turned out to be weak injectors. We have a couple of 460XT's CL's around here and the guys love'em. Quote Link to comment Share on other sites More sharing options...
Mackpro Posted February 4, 2008 Share Posted February 4, 2008 I never really looked up the specs of the 460XT till now, but this morning I was checking out the 1999/2000 Mack tune up specs manual and the reugular 460 and the 460XT have the same HP "487" but the XT has 1760 ft. lb of torque and the regular 460 has just 1660 ft. lbs of torque. Make sure your turbo boost is between 27-35 psi under a load, with closer to 35 the better and fuel pressure going into the block around 100 psi, Mack has a 100 psi fuel valve, we put them in all the time. A good injector shop can add a little flow to your injectors, we use United Fuel and Turbo in Birmingham Alabama.Keep your air filter changed, watch your pryometer and make sure the hole in your hood is lined up with your air filter housing so your not sucking in hot engine bay air. 1 Quote Link to comment Share on other sites More sharing options...
fjh Posted February 5, 2008 Share Posted February 5, 2008 I never really looked up the specs of the 460XT till now, but this morning I was checking out the 1999/2000 Mack tune up specs manual and the reugular 460 and the 460XT have the same HP "487" but the XT has 1760 ft. lb of torque and the regular 460 has just 1660 ft. lbs of torque. Make sure your turbo boost is between 27-35 psi under a load, with closer to 35 the better and fuel pressure going into the block around 100 psi, Mack has a 100 psi fuel valve, we put them in all the time. A good injector shop can add a little flow to your injectors, we use United Fuel and Turbo in Birmingham Alabama.Keep your air filter changed, watch your pryometer and make sure the hole in your hood is lined up with your air filter housing so your not sucking in hot engine bay air.pro68 the xt file will let em make 40 psi on a cool day! 35 is bottom spec for a truck with the XT program!Those puppys haul ass!Any trucks we have had with that file in the program made 35 psi on a bad day.If you were lucky enought to have gotten one of these trucks keep it!NEVER EVER have the eecu reflashed Cause you WILL NOT get the same engine file! I beleive it has been removed from exsistance! Quote Link to comment Share on other sites More sharing options...
Lmackattack Posted February 5, 2008 Share Posted February 5, 2008 pro68 the xt file will let em make 40 psi on a cool day! 35 is bottom spec for a truck with the XT program!Those puppys haul ass!Any trucks we have had with that file in the program made 35 psi on a bad day.If you were lucky enought to have gotten one of these trucks keep it!NEVER EVER have the eecu reflashed Cause you WILL NOT get the same engine file! I beleive it has been removed from exsistance!anywhy?....EPA Quote Link to comment Share on other sites More sharing options...
Mackpro Posted February 5, 2008 Share Posted February 5, 2008 pro68 the xt file will let em make 40 psi on a cool day! 35 is bottom spec for a truck with the XT program!Those puppys haul ass!Any trucks we have had with that file in the program made 35 psi on a bad day.If you were lucky enought to have gotten one of these trucks keep it!NEVER EVER have the eecu reflashed Cause you WILL NOT get the same engine file! I beleive it has been removed from exsistance!This is true, dont reflash the eecu, Mack has a voluntary recall on alot of trucks in the 1999-2000, they offer you a free oil change if you come and let the dealer reflash/reprogram the eecu. More EPA bulls**t Quote Link to comment Share on other sites More sharing options...
Kuhlman8387 Posted July 21, 2017 Share Posted July 21, 2017 I had the 460xt program before we had to replace the motor.....can anyone tell me where i can get it back into my ecm?? Got 50000 left on warranty...man...it ran like a champ!!!!! Quote Link to comment Share on other sites More sharing options...
Dirtymilkman Posted July 21, 2017 Share Posted July 21, 2017 My 2001 CL taps 45 psi of boost on a good pull with stage 2 injectors and stock turbo. Guy at the dealer figured that's probably well over 500 hp. And it's not an xt file. 1 Quote Link to comment Share on other sites More sharing options...
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