2002 Straight Piped Cummins ISC 8.3L Diesel Exterior Start Up

2002 BlueBird All American RE, sounds cool, doesn't it?
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[@mikey__639]

That’s sounds so freakin good 😌

[@BigJoe21211]

She definitely sounds good!

[@brandonyoung4004]

Can you do a test drive of it

[@deeremeyer1749]

Now you can be slow AND loud and use the noise to attract more attention to how slow it is.

[@Farout397]

More videos of this unit please 👍

[@charlesrodriguez7984]

Nice sounds.

[@MurrDog723NoNeYa-je4bp]

Any mechanical anomalies you'd like to share? Mine "blips" the throttle when at idle occasionally.

[@miquelbotello4608]

Did you need to re-work your ecu/ecm engine computer? I hear our bus 8.3 isc engine's turbo needs back pressure, but I heard that is false and Cummins engine don't need or rely on back pressure. I have a 2002 blue bird re 8.3isc with a Allison MD3060 Transmission and I wouod love to straight pipe my exhaust system. Please let me know thanks.

[@johnclamshellsp1969]

You do not need back pressure on a turbo diesel. A diesel needs flow. For your muffler issue, just purchase a resonator pipe. Something like a Donaldson M100465 if that will fit. This will give you the throaty diesel turbo sound, and remove the choppy noise. Also. take your intake boot off at the turbo and look for a restrictor ring. If you see this remove it. This will make your turbo louder but will improve spool-up time (turbo lag) and give about a 5% increase in power.

[@user-cw1pv6ro7z]

Can someone tell me what changes (sound) in the engine at 13sec. I just bought an 2001 8.3 and it does the same thing.

[@MurrDog723NoNeYa-je4bp]

So does mine, 1999 Dutch Star motorcoach. I'm a mechanic and I believe that it's "lighting off" because mine does it too, especially in cold weather. I'm certain that's it's normal. 59K miles on mine so it's not even broken in yet. Another thing mine does is "Blip" the throttle when it's at idle. I've heard rumors of the P-Pump causing this or "lift-gate" but am very unfamiliar with these electronic engines. We should stay committed to finding out bc anytime the throttle blips or bounces when not being asked to, is only a prerequisite to the engine "running away" in my opinion.

[@Stuffandfangs]

The idle gets set to low after open loop mode. For a long explanation I copied someone's explanation on a forum, "Entirely normal; it's called the "open loop" mode. The engine control unit is ignoring the MAF, MAP, O2 sensors output and enriching the fuel/air mixture to aid in starting the engine and bringing the coolant (and, therefore, the engine block) to operative temperature fast enough (in the meantime, a heating element inside the O2 sensor is bringing it to the sensor's operative temperature as well). After a few seconds, once a certain coolant temperature has been achieved, the ECU automatically goes into the "closed loop" mode, that is, it begins optimizing the fuel mixture by taking into account the sensors output, so that less fuel is wasted away and the emissions can be lowered. Less fuel also implies lower idle."

[@deeremeyer1749]

​@@Stuffandfangs"Open loop mode"?

[@deeremeyer1749]

Until 13 seconds the engine is on "pilot injection" and there are multiple smaller injections of fuel for "emissions". The several events prevent diesel "clatter". Once the engine is "warmed up" and ready to "go to work" and is placed under any "accessory load" pilot injection turns off and the "clatter" begins. Those started as "off-road" engines and John Deere in particular "developed" pilot injection for its engines and machines primarily to reduce cold-start smoke and noise emissions during "warm up" when people may be doing "maintenance" near a running engine. The noise can be excessive and it can really play hell with audio communications. Going off pilot injection also signals an operator the engine - and entire machine - is properly "warmed up". "Going to work" before that doesn't necessarily hurt anything but when you do hear it turn off and continue to idle the engine and machine you are definitely WASTING fuel, oil, time, money etc. Cummins - actally "CDC" since C-series engines were a "joint venture" between Cummins and Case-IH - has "adopted" many other manufacturers' "off the shelf" engine fuel and control systems ever since "developing" the B and C engines 40+ years ago and in particular from John Deere and its "partners" in the fuel system industry. Primarily Bosch. Deere has 8.1-liter HPCR "electronic" diesels and "markets" its engine "lineup" to 700+ OEM engine "customers" that put "Deere power" into their machinery and equipment products for "off highway use" and "historically" that was the ONLY "market" for CDC C8.3 engines in "America". Its almost certain that "Cummins" engine in a "stand alone" application (as all Cummins engines are since Cummins builds nothing BUT engines) has pilot injection in/on its Bosch fuel and control system or "clone" thereof because its John Deere "competition" did/does and CDC "adopted" everything about Deere's technology when it chose Bosch "off the shelf" hardware and "software". I can tell you that Deere's use of pilot injection is considerably more "advanced" when the JD engine is powering a JD "vehicle" and there is no situation where PI is active for only 13 seconds before the engine is "warmed up". The engine would already be warmed up if only 13 seconds was required. It can be very surprising when the engine suddenly starts "clattering" and it could sound like a "catastrophic failure" to the "uninitiated". Deere PI typically "cycles" off and back on for a few seconds each a few times before turning off for good as sort of a "warning" and signal that the engine is under control. Emissions INCLUDE noise emissions and there are "laws" on how loud engines/machines at "idle" can be to "bystanders". Sound is ALSO ENERGY AND IT TAKES FUEL TO PRODUCE IT AND MORE FUEL TO OPERATE "DIRECT INJECTION" THAN "PILÒT INJECTION" AND MORE FUEL EQUALS MORE EMISSIONS. If CDC wasn't just an engine manufacturer those engines wouldn't "suddenly" sound different to a "bystander" only 13 seconds after "startup" because the "brains" would be "smarter".

[@muthatrucka76]

Never seen a 8.3 in a school bus..Just 5.9 amd 6.7...Must be a 77 passenger or above..

[@DeadChan67]

Sound kind of like a RAM 3500