BNSF GP38-2

[g_nash]

I don't know of any plans that RSC has for future locomotives or other paint schemes.

That don't sound promising.

As for the MP SD40-2s, trust me, it ticked me off the most, and I refuse to let it happen to these.

I don't doubt it considering the help offered ...
and you might want to show them a few examples of the roofs on boxcars while you're at it,they need some help there

Have fun

[buzz456]

Roots-type supercharger.

Does this change the way it looks, or only how it sounds? (speaking of the model)

Just the way it sounds. I don't want to start a food fight here but the GP38-2 sounds that Krellnut did are from actual recordings of the real thing so I don't understand what the beef could be with them. If you poke around on U-Tube and other places he got it pretty darn close IMO.

FYI a turbo charger is spun up from exhaust gas driving it to compress the intake side while a supercharger is mechanically driven by belt, chain drive, shaft drive. There is some lag with the turbo charger since the engine needs to be reved up to pressure the turbine in the turbo hence the cloud of smoke as the engine revs due to it being a very rich mixture until the turbo charger spools up.

[BNSFdude]

FWIW, EMDs don't have lag. They are run as a supercharger via a clutch at lower speeds, and at higher engine rpm it disengages and freewheels. I listened to walts sounds, they are clearly turbocharged.

[buzz456]

FWIW, EMDs don't have lag. They are run as a supercharger via a clutch at lower speeds, and at higher engine rpm it disengages and freewheels. I listened to walts sounds, they are clearly turbocharged.

Whatever.

[BNSFdude]

Seriously have a listen. I've been doing audio for years, starting with MSTS.
The sounds have the turbo whistle. For a non turbo sound, listen to bark.wav, thats what a Non-Turbo 645 sounds like, like in a GP38-2. There are no turbocharged GP38-2s. The CSX GP38-2S is a derated GP40-2.

[krellnut]

Some of you people astonish me sometimes. My GP-38 sound pack has been out for a couple of years now, and anyone who is using it had no complaints. Now that RSC is doing a GP-38 my sounds are in the line of fire as to how accurate they are. And then we have Woody, who always lets me know when my sounds aren't right for that application, yet his sounds aren't perfect either. Almost all his sounds are recorded with the loco stationary, they sound totally different stationary than when moving. All my sounds are recorded with the loco moving and working. The sound set he did for the SP45 was the same sounds that Adain and he used on the SD40 sound set. Nothing special there. The mid engine sound file he used on Ian's SD60, he grabbed it from you tube. And now he wants to keep going at my sound set for accuracy, what a joke. If my sounds are so bad, why is he using a couple of them. The second ES44 in the Marias Pass route has my idle. No big deal there for me. But on the Dash9 sound set he just released, he used another one of my sounds. No big deal again, EXCEPT he had no problem thanking Brian for the use of his horn. You people have no idea how much effort it took to get all the sounds that I did. If you don't like them, don't use them. At this point, no SD70 update and most certainly no SD40 sounds. Let Woody do them. Talk all you want about the GP-38 that RSC is doing, but if I see one more post about my sounds again I will pull all my stuff from the library and be like some of you; contribute nothing and take all and even complain sometimes. Sharing used to be fun.

[buzz456]

Seriously have a listen. I've been doing audio for years, starting with MSTS.
The sounds have the turbo whistle. For a non turbo sound, listen to bark.wav, thats what a Non-Turbo 645 sounds like, like in a GP38-2. There are no turbocharged GP38-2s. The CSX GP38-2S is a derated GP40-2.

Explain to me what a roots blower is if it not a turbocharger? The intake pressurizer on my John Deere tractor is called a turbocharger. It is driven by exhaust gas. The roots blower on the 645 for the GP38-2 is what?

What you are describing like is on the GP40 is really a supercharger at low rpm and then operates as a turbocharger at higher rpm.

[buzz456]

@Krellnut,

You are in the top 1% of contributors to the freeware world of Rail Works. Don't you dare even think about pulling out of anything because of a few self endowed experts.

Rant off,

[imnew]

Some of you people astonish me sometimes. My GP-38 sound pack has been out for a couple of years now, and anyone how is using it had no complaints. Now that RSC is doing a GP-38 my sounds are in the line of fire as to how accurate they are. And then we have Woody, who always lets me know when my sounds aren't right for that application, yet his sounds aren't perfect either. Almost all his sounds are recorded with the loco stationary, they sound totally different stationary than when moving. All my sounds are recorded with the loco moving and working. The sound set he did for the SP45 was the same sounds that Adain and he used on the SD40 sound set. Nothing special there. The mid engine sound file he used on Ian's GP60, he grabbed it from you tube. And now he wants to keep going at my sound set foe accuracy, what a joke. If my sounds are so bad, why is he using a couple of them. The second ES44 in the Marias Pass route has my idle. No big deal there for me. But on the Dash9 sound set he just released, he used another one of my sounds. No big deal again, EXCEPT he had no problem thanking Brian for the use of his horn. You people have no idea how much effort it took to get all the sounds that I did. If you don't like them, don't use them. At this point, no SD70 ypdate and most certainly no SD40 sounds. Let Woody do them. Talk all you want about the GP-38 that RSC is doing, but if I see one more post about my sounds again I will pull all my stuff from the library and be like some of you; contribute nothing and take all and even complain sometimes. Sharing used to be fun.

Krellnut. ( sorry for quoting you entire post )

Please please do not leave us. Your sounds are amazing ! What would railworks TS2013 be without your sounds and Jessies reskins? I use them all the time. Lets face it, our community is not the biggest and last year we lost some really good talent. We dont wanna loose another talented contributor.

Best regards

A fan !

[ArcticCatZRT]

Hmm, sounds interesting. I'll be excited to see what RSC can come up with, whether or not it has been done before.

[thecanadianrail]

Seriously have a listen. I've been doing audio for years, starting with MSTS.
The sounds have the turbo whistle. For a non turbo sound, listen to bark.wav, thats what a Non-Turbo 645 sounds like, like in a GP38-2. There are no turbocharged GP38-2s. The CSX GP38-2S is a derated GP40-2.

Explain to me what a roots blower is if it not a turbocharger? The intake pressurizer on my John Deere tractor is called a turbocharger. It is driven by exhaust gas. The roots blower on the 645 for the GP38-2 is what?

What you are describing like is on the GP40 is really a supercharger at low rpm and then operates as a turbocharger at higher rpm.

The Roots type supercharger or Roots blower is a positive displacement lobe pump which operates by pumping a fluid with a pair of meshing lobes not unlike a set of stretched gears. Fluid is trapped in pockets surrounding the lobes and carried from the intake side to the exhaust. It is frequently used as a supercharger in engines, where it is driven directly from the engine's crankshaft via a belt or, in a two-stroke diesel engine, by spur gears.

slight misunderstanding on bnsfdude's part, its just another unique type of supercharger.

on another part about the current GP38-2 that we have, the bare bones default stock version does NOT have krellnuts sounds, and the default ones that JR used are just awful compared to others. also, many railways have done upgrades to GP38's to include different types of superchargers and such, although I think the original gp38's were delivered without superchargers or was an option on the GP38-2 but I could be wrong.

[buzz456]

"The first thing you'll need to know is that a supercharger and a turbocharger are pretty much the same thing. Both are essentially air pumps, cramming more air into the intake than an engine can suck in on its own. Boost, which is normally measured in pounds per square inch (psi) or bar (1 bar = 14.7psi), is the amount of air pressure that an engine will see over a naturally aspirated setup. The difference between the two chargers lies in the fact that turbochargers make boost through the spinning of a turbine wheel that is pushed by exhaust gases, while supercharger compressors are driven by a belt connected to the various pulleys on an engine's face."

Read more: http://www.importtuner.com/tech/0609_im ... z2SWrVLxhC

Now that we have that all settled my question which I still don't know is the 645 in the GP38-2 just plain normally aspirated (no boost of any kind) or does it have some sort of pressure boost on the intake?

I know wikipedia is not always accurate but it says:"The GP38-2 differs externally from the earlier GP38 only in minor details. Its most distinctive identifying feature is the cooling water level sight glass on the right side of the long hood. The battery box covers of the Dash 2s are bolted down instead of hinged. It can be distinguished from the contemporary GP39-2 and GP40-2 in that its Roots blown engine had two exhaust stacks, one on each side of the dynamic brake fan,"

Again from wiki: "Rebuilds

A number of higher horsepower 40 Series locomotives have been rebuilt into the equivalent of a GP38-2, by removal of the turbocharger and the substitution of twin Roots blowers."

Which would indicate that the GP38-2 was supercharged not turbocharged.

[BNSFdude]

I record my locomotives while stationary but on load banks at BNSFs Northtown. But I haven't called out any of Walt's sounds except these. The freight pack, 710 and GEVO-12 sounds you have made are outstanding with clarity and general environmental feel.

To make it clear, no EMD engine (except possibly the 4 stroke 265H) could run without a positive scavenging device. So that means a turbo or supercharger. EMD since the F units or SW1 has always used a roots type super charger. Then came along the GP20, where they introduced the clutched turbo.

When the 645s came along, they had the 40 series using the 645E block with the 3C type turbo charger.
The 38 series used the 645E block, no turbo, but rather the roots type blower.

Aside from switchers from then on, the GP15/MP15 was the last locomotives to offer the roots blown engine.

From an audio position, think of it like this; GP38 series = GP9 with a slightly higher RPM. 300 vs 275.

My apologies for not explaining it better, I usually figure that the material for knowing this stuff is accurate, but Wiki states it as Naturally Aspirated, which isn't possible due to its 2 stroke nature.

[dcushing]

Getting back to the original topic, I would have thought that RSC would have shown a screen shot of the GP38 during this bank holiday future products extravaganza over on farcebook. So far the only new product announced was the high-nose SD45.

Duncan

[ArcticCatZRT]

Getting back to the original topic, I would have thought that RSC would have shown a screen shot of the GP38 during this bank holiday future products extravaganza over on farcebook. So far the only new product announced was the high-nose SD45.

Duncan

It may not be screenshot ready yet