W126 Exhaust Performance Upgrades

More threads by Oversize

OP
Oversize

Oversize

Grand Master
Messages
5,746
Points
596
Location
Melbourne
Looks like I’ll have to build my own if I wish to follow this path!
 

motec 6.9

Prodigal Son
Messages
6,578
Points
250
Location
Cantberra
Most decent exhaust shops can build you a very decent performance exhaust. Find out were the racing or drag guys go would be a good place to start or the show car guys as they are very picky.
 
OP
Oversize

Oversize

Grand Master
Messages
5,746
Points
596
Location
Melbourne
Yes I think I’ll just be sourcing the parts and having them weld it together. Not full stainless either. Probably just downpipes and mufflers.
 
OP
Oversize

Oversize

Grand Master
Messages
5,746
Points
596
Location
Melbourne
Interesting that the Benz firing order is the same as the Mustang 5.0 & Buick Nailhead! And yet the Benz Tri Y design is rather unique...
 

motec 6.9

Prodigal Son
Messages
6,578
Points
250
Location
Cantberra
Mark this is what i did with 6.9 exhaust it is duel 2.5 inch with x pipe hotdogs and rear resonator that is duel in duel out . You know about the custom extractors and how they are set up for correct firing order
 

Attachments

  • 33.jpeg
    33.jpeg
    26.4 KB · Views: 3
  • 205.jpeg
    205.jpeg
    105.6 KB · Views: 2
  • IMAG0552.jpg
    IMAG0552.jpg
    109.2 KB · Views: 2
  • IMAG0554.jpg
    IMAG0554.jpg
    98.7 KB · Views: 2
  • IMAG0555.jpg
    IMAG0555.jpg
    91.3 KB · Views: 3
  • IMAG0559.jpg
    IMAG0559.jpg
    110 KB · Views: 2
OP
Oversize

Oversize

Grand Master
Messages
5,746
Points
596
Location
Melbourne
Yes that’s my point. The other engines have the same firing order yet the manufacturers have not done anything special with their exhausts. So is the unique design not worth the effort??

Great job BTW Geoff!
 

motec 6.9

Prodigal Son
Messages
6,578
Points
250
Location
Cantberra
Exhaust and extractors were worth around 25hp at the rear wheels. How much is down to either the extractors or exhaust is down to conjecture.
 
OP
Oversize

Oversize

Grand Master
Messages
5,746
Points
596
Location
Melbourne
Based on an exhaust port of 39.5mm (AMG 500, std 500/560 is 37mm), the minimum exhaust internal diameter (ID) is:

2.75” (69.85mm) single,
2.25” (57.15mm) dual.

However these are for a dead straight pipe with no additional resistance (ie no mufflers) so the diameter should be increased to compensate....
 
OP
Oversize

Oversize

Grand Master
Messages
5,746
Points
596
Location
Melbourne
What I found strange is the valves are all 39.10mm. To me the AMG porting out to 39.5mm is pointless since the valve is smaller than the port and that doesn’t even account for the valve stem!! So the exhaust valve is the biggest restriction in this area.
 

c107

and 111/116/124/126
Moderator
Messages
3,507
Points
760
Location
Sydney
Yes that’s my point. The other engines have the same firing order yet the manufacturers have not done anything special with their exhausts. So is the unique design not worth the effort??

Great job BTW Geoff!

May be cost related? Benz sold their cars for a much higher price so had more room to work in terms of the specification and still providing room for a profit....

Its the old story like the Rover SD1. Engineers wanted to do a IRS instead of live rear axle, but BL vetoed it that buyers wouldn't spend the extra $50 or whatever it would have been.
 

motec 6.9

Prodigal Son
Messages
6,578
Points
250
Location
Cantberra
A Holden executive in the 90's boasted that they had never spent more than 2 dollars on their car stereo speakers even in high end models. Says it all really.
 

c107

and 111/116/124/126
Moderator
Messages
3,507
Points
760
Location
Sydney
I just had the exhaust done on my SEL. Somebody had replaced the kidneys and done a terrible job. You couldn’t get the hangers to line up and it was scraping the drive shaft. I replaced it with a stainless system sans kidneys. I can feel the increase in performance and you get a better sound under hard acceleration but it is nice and quiet around town.


40-DA47-FE-F3-A1-417-D-B77-F-4-B2-CA5-DC8227.jpg

AADD3528-6-F04-49-C0-B40-F-731561-D8818-C.jpg

FA754-D1-E-1786-4440-A8-B4-E99-C9050-CEF4.jpg

FADFA87-E-7-B97-4-C00-9909-37-CCC0661752.jpg
 
OP
Oversize

Oversize

Grand Master
Messages
5,746
Points
596
Location
Melbourne
Looks great! I’m still sceptical about the X pipes, so I’ll try something different next time.
 
OP
Oversize

Oversize

Grand Master
Messages
5,746
Points
596
Location
Melbourne
This is a mates SEC...

41-F6698-C-506-A-4-E81-AB44-0-AA6178-D5-DD2.jpg
 
OP
Oversize

Oversize

Grand Master
Messages
5,746
Points
596
Location
Melbourne
Geez I think I may have to get the verniers out onto Doras exhaust! I have a feeling it has 2 x 2.5” pipes... Interesting that hot dogs reduce drone & are therefore totally worthwhile.
 
OP
Oversize

Oversize

Grand Master
Messages
5,746
Points
596
Location
Melbourne
Here’s an original AMG setup...

ADB7-BF46-864-D-4528-8063-4-DA843-E3267-C.jpg
 
Similar threads
Thread starter Title Forum Replies Date
E200K W126 Exhaust Mercedes W126 11
Michel Difference Between W116 and W126 Technical Information 15
W126GUYSYDNEY Sydney to South Australia in our W126 Mercedes W126 7
c107 Sold: 1986 300SE W126 Gumtree/eBay/Facebook Listings 24
RT 420SEL W126 cruise control Technical Information 1
5 W126 Rear SLS Strut ball joints - availability? Mechanicals 5
Michel My W126 380SE Mercedes W126 40
Michel W126 comparison Mercedes W126 33
RT 420SEL W126 420SEL front suspension. Technical Information 4
c107 SOLD:: Mercedes 8 hole 16" replica wheels & tyres for W126 or similar Gumtree/eBay/Facebook Listings 1
RT 420SEL W126 Interior door trim clip repair. Centre burl trim. Interiors 2
RT 420SEL W126 Internal door card clips. Interiors 6
c107 Colours for the W126 model Mercedes W126 5
c107 W126 used bits Gumtree/eBay/Facebook Listings 3
c107 Check the battery tray on your W126 Mercedes W126 1
c107 W126 UK Price and option list Mercedes W126 8
Oversize W126 Concept Car Mercedes W126 5
c107 W126 buyers guide Mercedes W126 5
c107 W126 self leveling struts Mercedes W126 18
c107 W126 Tutorials Mercedes W126 0
c107 Great old W126 Ad Mercedes W126 6
Oversize Polished W126 Wheels Mercedes W126 11
abl567 W126 Service Manual Gumtree/eBay/Facebook Listings 2
c107 lug bolts for W126 'manhole cover' wheels Gumtree/eBay/Facebook Listings 3
Michel Ball joints for 6.9 / W126 hydropneumatic Recommended Suppliers 1
c107 W126 Review by Doug DeMuro Mercedes W126 2
c107 why does the 500SE have a shorter wheelbase than other SWB W126? Mercedes W126 8
Oversize W126 Book Articles 4
260ebenz W126 video Mercedes W126 0
Styria The W126 - 300 - 380 -420 -500 -560 Mercedes W126 11
260ebenz Impala Brown W126 for sale Gumtree/eBay/Facebook Listings 6
Oversize WTB Mercedes W126 560 speedo head Gumtree/eBay/Facebook Listings 0
Oversize W126 rear blind Gumtree/eBay/Facebook Listings 1
Oversize Spare W126 Bonnet Gumtree/eBay/Facebook Listings 6
Styria W126 Wheel Arch Moulds Gumtree/eBay/Facebook Listings 0
motec 6.9 W126 in KFC Double add Mercedes W126 13
260ebenz W126 Mercedes-Benz 560SEL Mercedes W126 20
Oversize W126 Additional Wood Trims Interiors 3
Oversize W126 Steering Columns Mercedes W126 42
motec 6.9 W126 looking 6.9 Gumtree/eBay/Facebook Listings 22
Oversize A W126 Daily? Mercedes W126 8
260ebenz W126 part required Mercedes W126 28
L Armoured w126 Mercedes W126 0
260ebenz W126 Manuals Mercedes W126 0
Oversize W126 500SEL full hydro??? Mercedes W126 8
Styria W126 Variations Websites and Links 1
260ebenz Interesting W126 website Mercedes W126 2
Oversize W126 Video for Tim Mercedes W126 2
260ebenz W126 Manuals Mercedes W126 11
Styria W126 Purchasing Advice Mercedes W126 3

Similar threads

Top