Straight pipe = no power - Page 5 - PeachParts Mercedes-Benz Forum

LUVMBDiesels · #61 11-27-2010, 03:32 PM

Your waste gate is cutting exhaust into the turbo at 10.5, which is way better than the 9 my waste gate was set at. If you put in a boost controller, you can set it to 13psi with the stock fuel, any higher than 15 is a waste and 20 is too much!

The boost controller goes in the hose between the turbo and the waste gate. It is simply a ball valve on a spring. You can set it to 13psi and it will stay closed until then. When it opens the waste gate will see signal and cut the exhaust going into the turbo.

mach0415 · #62 11-27-2010, 04:23 PM

Gotcha! I can adjust my wastegate b/c I have a KKK K26, so I will be experimenting with it this week. Simple enough to mess with, since it is adjustable externally

mike-81-240d · #63 11-27-2010, 04:34 PM

Quote:

Originally Posted by MTUpower

Does a 617-912 powered sedan have a "forward muffler pair" and could you straight pipe it legally?

http://www.youtube.com/watch?v=0br-zmGOEvQ

I removed the rear silencer...

I need to do 2.5 or 3 inch back soon though... My 4 banger exhaust system is 2in. So now my car goes 2.5 to 2.0 to 2.5

BTW this is a OM617.912.

mach0415 · #64 11-27-2010, 04:40 PM

You may want to keep your 2 inch exhaust on a N/A motor for back pressure purposes. The less restrictive 2.5 inch on the turbo engines were to reduce back pressure to allow the turbo quicker spin-up time. The video sounded cool, though

mike-81-240d · #65 11-27-2010, 04:46 PM

I'm hoping to turbo it soon... Like this guy.

http://superturbodiesel.com/std/my-83-300d-t-1857.html

mach0415 · #66 11-27-2010, 04:54 PM

PM MTUpower. He has lots on this.

WDBCB20 · #67 11-27-2010, 10:39 PM

Quote:

Originally Posted by Brian Carlton

Actually, the removal of the resonator caused no sound issue.

So, I disagree with the statement that the simple removal of the resonator will cause excessive drone in the cabin. It might offer a touch of noise at exactly 2000 rpm which I really cannot confirm. But, I can assure you that it would be objectionable to only the most critical of observers. Such people would not be driving diesels because of the fundamental additional noise they present.

Since I have around 2 years continual side by side comparison of a non resonator car ('83) with a resonator car ('85) which I regularly alternate driving, I disagree with your disagreement. Every time I switch cars I notice anew how much louder the '83 is after having driven the '85 and how much quieter the '85 is after having driven the '83.

I drive both at around 3000rpm on the highway and on longer trips it does affect driving comfort. The '83 feels a lot more peppy though -don't know to what degree that's attributable to the 3.07 vs 2.88 rear end or the missing resonator.

Brian Carlton · #68 11-28-2010, 08:37 AM

Quote:

Originally Posted by WDBCB20

Since I have around 2 years continual side by side comparison of a non resonator car ('83) with a resonator car ('85) which I regularly alternate driving, I disagree with your disagreement. Every time I switch cars I notice anew how much louder the '83 is after having driven the '85 and how much quieter the '85 is after having driven the '83.

I drive both at around 3000rpm on the highway and on longer trips it does affect driving comfort. The '83 feels a lot more peppy though -don't know to what degree that's attributable to the 3.07 vs 2.88 rear end or the missing resonator.

How have you configured your supports for the system on the '83?

MTUpower · #69 11-28-2010, 08:55 AM

Quote:

Originally Posted by mach0415

Gotcha! I can adjust my wastegate b/c I have a KKK K26, so I will be experimenting with it this week. Simple enough to mess with, since it is adjustable externally

If you do not have a egt and a boost gauge you should not start doing these mods unless you have experience doing the same thing many times over. Start another thread on that and start it in the diesel performance section, but first do a search/research.

mespe · #70 11-28-2010, 10:14 AM

Quote:

Originally Posted by toomany MBZ

This is mine (SD) winds up, without the resonators and a stock Ansa muffler.

Cheap camera: http://www.youtube.com/watch?v=YyCE2tXoUis

Turn the radio on, you won't notice the drone.

40-70MPH in 20 seconds, I don't think that's a record, porbably faster than my 300SD

here a vid, 40-60 in 11 seconds, here the engine wind out, I think your transmission is shifting too early.

http://www.youtube.com/watch?v=Nr7C9YVmzDU&feature=related

Now this is fast

http://www.youtube.com/watch?v=mwPNtwxVo2k

Well anyway, the point is, the engine REQUIRES a certain amount of backpressure to operate properly.

It is fun searching youtube for 300d Acceleration

WOW 0-80 in 20 seconds,,, :39 to :59 in video

http://www.youtube.com/watch?v=fcsgyPGgaxg&feature=related

vwbuge · #71 11-28-2010, 10:31 AM

Quote:

Originally Posted by MTUpower

If you do not have a egt and a boost gauge you should not start doing these mods unless you have experience doing the same thing many times over. Start another thread on that and start it in the diesel performance section, but first do a search/research.

Definitely need the boost gauge but he can do without the egt unless he ads secondary fuel.

WDBCB20 · #72 11-28-2010, 06:21 PM

Quote:

Originally Posted by Brian Carlton

How have you configured your supports for the system on the '83?

Pipe seems to run without any supports at all between engine and muffler.

Brian Carlton · #73 11-28-2010, 06:50 PM

Quote:

Originally Posted by WDBCB20

Pipe seems to run without any supports at all between engine and muffler.

Well.............I'd double check that if it "seems to run"............

A significant increase in sound level is doubtful inside the vehicle from the simple elimination of the kidney resonators. You might get some increased noise from the tailpipe, but you wouldn't notice this at speed.

WDBCB20 · #74 11-29-2010, 10:24 AM

Quote:

Originally Posted by Brian Carlton

Well.............I'd double check that if it "seems to run"............

A significant increase in sound level is doubtful inside the vehicle from the simple elimination of the kidney resonators. You might get some increased noise from the tailpipe, but you wouldn't notice this at speed.

So I'm imagining it. And Daimler Benz installed 892,123 of the things because Mr. Sacco was enamored of the elegant shape not to mention the selling point of being able to mention "kidney resonators" - yet another DB first, in our list of technological advances.

Otoh, we are known to lose certain frequencies as our hearing ages. But I won't begrudge you the absence of increase in sound level, real or imagined. And if your SD really is noisier, then so much greater the contrast with the relative quiet of the SDL which is then appreciated all the more. A win win really.

Pipe for your perusing pleasure.

Brian Carlton · #75 11-29-2010, 10:56 AM

Quote:

Originally Posted by WDBCB20

So I'm imagining it. And Daimler Benz installed 892,123 of the things because Mr. Sacco was enamored of the elegant shape not to mention the selling point of being able to mention "kidney resonators" - yet another DB first, in our list of technological advances.

Otoh, we are known to lose certain frequencies as our hearing ages. But I won't begrudge you the absence of increase in sound level, real or imagined. And if your SD really is noisier, then so much greater the contrast with the relative quiet of the SDL which is then appreciated all the more. A win win really.

Pipe for your perusing pleasure.

Nope........no hangars there.

You may be perfectly correct in that the sound level is higher without them. I don't have a back to back test that I can perform with another vehicle.

I simply do not recall any significant increase in sound level from the point prior to which they were removed.

You are correct, however.........it is significantly louder than the SDL.