Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Diesel Discussion > Diesel Performance Tuning

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 02-11-2008, 04:35 PM
ForcedInduction
Guest
 
Posts: n/a
Dyno results here

107hp, 194.8lb/ft torque at the wheels.

1980 240D 3.0VNTi 215k miles
Modifications: OM617.952, 4-speed manual, GT2256V VNT turbo, air-air intercooler, W115 300D intake, 3.46 diff, ALDA/EGR removed, Pyrometer/Boost/Exhaust psi gauges, bypass oil filter and Mobil-1 5W-40 synthetic oil.

The second picture shows how much boost I have at idle, it drops to 0 when I open the vanes.

Post your dynamometer results if you have some.
Attached Thumbnails
Dyno results here-lmn-dyno-2-11-08-chassis-ms.jpg   Dyno results here-lmn-dyno-2-11-08-boostidle.jpg   Dyno results here-lmn-dyno-2-11-08-graph.jpg  
Reply With Quote
  #2  
Old 02-11-2008, 04:38 PM
Bajaman's Avatar
Registered User
 
Join Date: Mar 2005
Location: Bern, Switzerland
Posts: 713
Any idea how that boost curve looks compared to a stock turbo? Doesn't look like much boost below 2100 or so like the stock turbo.
__________________
For Sale: 1982 MB 300TD
1995 Chevrolet Suburban 6.5TD

Sold: 1980 IH Scout Traveler- Nissan SD33T Diesel
Reply With Quote
  #3  
Old 02-11-2008, 04:45 PM
ForcedInduction
Guest
 
Posts: n/a
Here is my sheet from 2-13-06 with the KKK K26 turbo.

The boost curve is nearly opposite.
Attached Thumbnails
Dyno results here-lance-overlay.jpg  
Reply With Quote
  #4  
Old 02-11-2008, 04:50 PM
Bajaman's Avatar
Registered User
 
Join Date: Mar 2005
Location: Bern, Switzerland
Posts: 713
I notice now that the boost starts at 7 psi, thats pretty impressive. Did they not load the engine below 2000 rpm?
__________________
For Sale: 1982 MB 300TD
1995 Chevrolet Suburban 6.5TD

Sold: 1980 IH Scout Traveler- Nissan SD33T Diesel
Reply With Quote
  #5  
Old 02-11-2008, 04:53 PM
ForcedInduction
Guest
 
Posts: n/a
Quote:
Originally Posted by Bajaman View Post
Did they not load the engine below 2000 rpm?
Just whatever it took to keep the rollers moving until he mashed the throttle.

Here is the graph where the vanes were set always open. Notice how the boost curve has a slightly more concave shape to it and starts at only 2psi.
Attached Thumbnails
Dyno results here-lmn-dyno-2-11-08-graph2-vanes-open.jpg  

Last edited by ForcedInduction; 02-11-2008 at 05:04 PM.
Reply With Quote
  #6  
Old 02-11-2008, 05:09 PM
bgkast's Avatar
Rollin' on 16s
 
Join Date: Dec 2005
Location: Vancouver WA
Posts: 6,528
Once I fix and sell the '79 I'm using the cash to upgrade and am aiming to beat that 107 HP.

Good job!
__________________
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine
Reply With Quote
  #7  
Old 02-11-2008, 05:15 PM
ConnClark's Avatar
Power User
 
Join Date: Nov 2005
Posts: 1,121
Quote:
Originally Posted by ForcedInduction View Post
Here is the graph where the vanes were set always open. Notice how the boost curve has a slightly more concave shape to it and starts at only 2psi.
Also notice how your low end torque fell. The higher boost gave you about 4% more torque.
__________________
green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons )
white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank)
desert storm primer 63 T-bird "The Undead" (long term hibernation)

http://ecomodder.com/forum/fe-graphs/sig692a.png
Reply With Quote
  #8  
Old 02-11-2008, 06:13 PM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
I'm not grasping why the maximum torque is only at 2300 rpm with a boost level of 8.5 psi.

Something is not right. There is no reason that this engine can't produce peak torque at 2800 rpm. Randy and others have dyno runs that confirm this.

This engine would have significantly more than 107hp if the torque peak could be shifted to the right.

Are you positive that the cam timing and IP timing are correct? Is the lift on the cam to spec?

Something needs adjustment.
Reply With Quote
  #9  
Old 02-11-2008, 06:31 PM
ForcedInduction
Guest
 
Posts: n/a
I'm very happy. Almost 200lb/ft of torque down low where its useful and a broad flat HP curve. All without opening up the pump or using additional fuel through water injection. I can't wait to get that extra 30% when I remove the rack limiter and tweak the torque capsule.

VIDEO

Last edited by ForcedInduction; 02-11-2008 at 07:27 PM.
Reply With Quote
  #10  
Old 02-11-2008, 07:18 PM
ConnClark's Avatar
Power User
 
Join Date: Nov 2005
Posts: 1,121
Quote:
Originally Posted by Brian Carlton View Post
I'm not grasping why the maximum torque is only at 2300 rpm with a boost level of 8.5 psi.

Something is not right. There is no reason that this engine can't produce peak torque at 2800 rpm. Randy and others have dyno runs that confirm this.

This engine would have significantly more than 107hp if the torque peak could be shifted to the right.

Are you positive that the cam timing and IP timing are correct? Is the lift on the cam to spec?

Something needs adjustment.
Its probably mainly due to the VNT and possibly the w115 intake manifold. You may notice that the dyno run where the turbine vanes are held wide open it does move the peak torque to the right. The peak is lower, but it is more to the right. This just illustrates the advantage the VNT has at generating efficient boost over a wider range of rpms. The longer intake runners probably shift the peak torque a little lower too.
__________________
green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons )
white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank)
desert storm primer 63 T-bird "The Undead" (long term hibernation)

http://ecomodder.com/forum/fe-graphs/sig692a.png
Reply With Quote
  #11  
Old 02-11-2008, 07:45 PM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Quote:
Originally Posted by ForcedInduction View Post
Here is my sheet from 2-13-06 with the KKK K26 turbo.

The boost curve is nearly opposite.
Now, there is a good looking set of curves. If the shape of the curve could remain the same and the torque peak raised...........it would be fabulous.
Reply With Quote
  #12  
Old 02-11-2008, 08:06 PM
ForcedInduction
Guest
 
Posts: n/a
Quote:
Originally Posted by Brian Carlton View Post
Now, there is a good looking set of curves. If the shape of the curve could remain the same and the torque peak raised...........it would be fabulous.
Yes, but the engine always had an early torque peak, it just never had a turbo that could supply air for it show.

I got 65lb/ft more torque, 10hp more power and much better drivability from only "bolt-on" changes with no additional fuel above stock, with better fuel economy on top of it!

Let me dust off my old PeeCee and see if I can get an overlay of my oldest and most recent graphs. Superflow does not have a Mac version of their dyno chart software.
Reply With Quote
  #13  
Old 02-11-2008, 08:09 PM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Quote:
Originally Posted by ForcedInduction View Post
I got 65lb/ft more torque, 10hp more power and much better drivability from only bolt-on changes with no additional fuel above stock, with better fuel economy on top of it!
Yes, I can see why you're quite pleased.

But, I'm still baffled by the inverted torque curve........it's just not common on these engines.
Reply With Quote
  #14  
Old 02-11-2008, 08:25 PM
ForcedInduction
Guest
 
Posts: n/a
Quote:
Originally Posted by Brian Carlton View Post
But, I'm still baffled by the inverted torque curve........it's just not common on these engines.
Well, neither is a variable geometry turbo.
Reply With Quote
  #15  
Old 02-11-2008, 08:32 PM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Quote:
Originally Posted by ForcedInduction View Post
Well, neither is a variable geometry turbo.
The VNT certainly explains the increase in torque down low.........but, it doesn't explain the falloff in torque from 2350 onward. It's my understanding that the VNT functions like a very small turbo at low rpm's and then, with its vanes open, functions nearly identical to the stock turbo at higher rpm's.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 12:04 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page