*Rule of thumb on HP rating

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Cummins Forum Staff

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Last edited by MR4WLR : 03-23-2007 at 04:45 PM.

whity ive had 50 psi with my hy35 and only 40 psi with the hx35

Not sure how accurate this would be ...LOL


this will help.....

Year Of Ram Transmission Stock HP 1994 Auto 160 1994 Manual 175 1994 1 Ton 240 1995 Auto 160 1995 Manual 175 1996 Auto 180 1996 Manual 215 1996 California 180 1997 Auto 180 1997 Manual 215 1997 California 180 1998 12V Auto 180 1998 12V Manual 215 1998 12V California 180 1998.5 Auto & Manual 215 1999 Auto 215 1999 Manual 230 2000 Auto 215 2000 Manual 245 2001/2002 Auto 235 2001/2002 Manual 245 2003/2004 Auto & Manual 305 2004.5 Auto & Manual 325

Oh yes ol wise one but the key to remember is I forgot to tell you it had to be within the turbo efficiency range in order to maintain its level of accuracy.

yeah it was wayyyyyyyy out of its efficentcy range ,,,, all drive pressure !

DM

What was the EGT's like??

[Gary - K7GLD]

That 1 PSI for 10 HP may be a good rule of thumb for guesstimates - but after I added my bigger injectors, BHAF and 4 inch exhaust, I got LOTS more HP, and only picked up 2 PSI boost max. I think that after a certain point, efficiency, timing and other operation parameters can offset or slew guesstimates based upon PSI boost alone...

Either that, or I was LOW on power before I made the later mods - but I *did* dyno 311 HP and 827 TQ before the mods...

__________________
White '02 Quad cab, NV5600, GAUGES! Comp, Walbro, DTT SS intake, Rip's 4 in. exhaust, Don M's 1.6's, DSS, Frantz oil bypass & fuel filters, Amsoil air filter, MOBILE Ham Radio-IC-706, 600 watt amp, '88 Kit 24 ft. 5er, 418 HP/978 Tq., 24 ft KIT 5er.

[Gary - K7GLD]

OR, to put it into clearer perspective - if I take a 1 HP Briggs and Stratton engine, and give it 30 PSI boost, will that make it a 300 HP lawnmower engine?

__________________
White '02 Quad cab, NV5600, GAUGES! Comp, Walbro, DTT SS intake, Rip's 4 in. exhaust, Don M's 1.6's, DSS, Frantz oil bypass & fuel filters, Amsoil air filter, MOBILE Ham Radio-IC-706, 600 watt amp, '88 Kit 24 ft. 5er, 418 HP/978 Tq., 24 ft KIT 5er.

311 HP and how much boost was you showing on the dyno?

[Gary - K7GLD]

Not enough - only about 26 PSI max - the dynos typically don't load the trucks enough to develop max boost - certainly not like a 7% grade towing our 5th wheel!

Before the last mods, I was seeing 32 PSI when towing hard - now I see a max of anout 34 PSI - and LOTS more power on same grades and loads.

__________________
White '02 Quad cab, NV5600, GAUGES! Comp, Walbro, DTT SS intake, Rip's 4 in. exhaust, Don M's 1.6's, DSS, Frantz oil bypass & fuel filters, Amsoil air filter, MOBILE Ham Radio-IC-706, 600 watt amp, '88 Kit 24 ft. 5er, 418 HP/978 Tq., 24 ft KIT 5er.

The 32 to 34 fits in well with the 311 HP but the 26 has me

[Gary - K7GLD]

Like I said, and suspect - the 1 PSI per 10 HP is a good general rule of thumb, but other contributing factors make it hard to use it as an absolute.

__________________
White '02 Quad cab, NV5600, GAUGES! Comp, Walbro, DTT SS intake, Rip's 4 in. exhaust, Don M's 1.6's, DSS, Frantz oil bypass & fuel filters, Amsoil air filter, MOBILE Ham Radio-IC-706, 600 watt amp, '88 Kit 24 ft. 5er, 418 HP/978 Tq., 24 ft KIT 5er.

Pyro was Nill

DM