Upgrades and Aftermarket - 6.0L EngineUpgrading and adding aftermarket equipment to your 2003-Up Super Duty or Excursion with 6.0L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 6.0L Power Stroke engine.
I was told by one shop that all power comes from muffler and cat back and not the down pipe and have dyno tests to prove it. They said down pipe didn't didn't add any significant hp but did lower EGT.
Can anyone else confirm this? And since I'm new to this, what is the benefit to lower EGTs?
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'05 F250 CC SB FX4 Amarillo pkg. Only mods so far are Line-X and 24" wiper blades, Alpine speakers, Harpooned and Zoodad!
Re: Does the down pipe add power or just reduce EGT?
With lower EGTs you can put your foot in it more and not lift because your going to melt your pistons. [img]/ubbthreads/images/graemlins/eek.gif[/img] [img]/ubbthreads/images/graemlins/eek.gif[/img]
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2002 F350 Lariat CC 4x4 Auto 4.10 DRW, DP-Tuner F5 live tuned stock, quiet, 40dd, 40, 60, 80 tow, 80e and 120r, B&W GN, BrakeSmart, 'pooned tank, tank and pre-pump mods, 2µ Dahl 100 filter, regulated return, BTS dual HPOP, AC singles with EDM 34 lpm nozzles, AIS, H2e, Spearco 6.0 IC, Hypermax 3.5" dp--> MBRP 4" 304SS exhaust, BTS tranny, 203º T-stat, Chevron ELC, coolant filter, Oilguard bypass with Schaeffer 9000, WranglerNW 200 amp alternator & Optima group 31 batteries, Nippon-Denso starter, SPA gauges, SteveRacer mods, Hella 80/100W 9007s, Hella Micro DE foglights, 1000FF driving lights, 220W backup lights, Stancor contactor, Michelin XPS Traction tires, X-Springs, Bilstein shox, custom bumpers but otherwise stock. Nov 30 '99 build engine with 16 K miles, Fluidampr, Comp Cam 910 springs, Melling LPOP and ARP headstuds. Alien-Patrol Customer Service Sucks!
Re: Does the down pipe add power or just reduce EGT?
Hmmm..
can't imagine a muffler and cat GIVING power [img]/ubbthreads/images/graemlins/smile.gif[/img]
but sounds like your shop has a bit of learnin to do...
a good mandral bend downpipe will do more to evacuate the exhaust gases than any muffler or cat....
and since the engine is just a big air pump...
more air out, means more air can come in... and therefore more HP...
when I added my turbo back exhaust I could immediately feel the difference... 10 to 30 hp is not unheard of...
Re: Does the down pipe add power or just reduce EGT?
I'm gonna put on dual Kittys and Muflers if that is true!!! [img]/ubbthreads/images/graemlins/biggrin.gif[/img]
Lower EGT's equal more air flow which allows you to put more fuel to the motor to go faster!! Like JB said more air is mo betta! There are more technical ways to put it but the bottom line is all about the more air you can introduce to your motor the better it will run and more efficiently too. Once you've accomplished the question of air you can safely add more fuel via chips, programmers, etc.
Re: Does the down pipe add power or just reduce EGT?
Yeah, I thought it sounded strange but what was even stranger was that they said they ran the tests using MBRP exhaust systems. [img]/ubbthreads/images/graemlins/shrug.gif[/img]
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'05 F250 CC SB FX4 Amarillo pkg. Only mods so far are Line-X and 24" wiper blades, Alpine speakers, Harpooned and Zoodad!
Re: Does the down pipe add power or just reduce EGT?
[ QUOTE ]
I was told by one shop that all power comes from muffler and cat back and not the down pipe and have dyno tests to prove it. They said down pipe didn't didn't add any significant hp but did lower EGT.
Can anyone else confirm this? And since I'm new to this, what is the benefit to lower EGTs?
[/ QUOTE ]
Maybe what they meant is that you can get more performance gains by replacing a stock pipes cat and muffler with more open or delete options than the power gain by replacing the downpipe with, say a 4" when stock was 3-3.5.
What I mean is, the cat and muffler are large restrictors, so opening them up does more than making an existing, pretty open pipe a little more open.
Does tha make any sense?
RL
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Black 2003 F350 DRW (almost nothing stock)
Other rides:
Black 2006 SRT8 300C (Mopar exhaust and CAI)
Black 2008 SRT8 Jeep (Mopar exhaust and CAI)
Black 2008 Mercedes E550 4MATIC
Re: Does the down pipe add power or just reduce EGT?
Sydwaiz,
If you want to really confuse them ask them how the tested the system and with what equipment they got their results. If they say a dyno, then start laughing. The HP an exhaust system produces can be made to vary so much on a dyno it's not even funny, even if you're trying to play fair the difference between say 20 HP and 25 HP in conescutive runs is very common, down pipe or not. How you applied the fuel, when and who hit the dyno button all change that outcome some and they either don't know that or want to sell what they have in stock vs what you might have asked about.
Mark @ DPPI
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