Here is a thread that might be of interest. tonystewart dynoed his car before and after his intake modifications. It appears he did gain a few horsepower. Based on his results I'm going to give it a try myself in the next few weeks. If I don't feel any difference, it'll take ten minutes to put it back in stock configuration...

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'81 300TD Wagon 355k (Miss Diesel)
'83 300SD 180k
'84 500SEL 190k (Parting it out)

Interesting.

__________________
'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R

The tony stewart car ALDA was adjusted - that will seriously change 0-30 mph acceleratrion time - especially if the original setting is a little "lean." The discussion is about intake air resistanct alteration NOT changing fuel enrichment parameters.

Marshall

You think I installed a manual boost controller and didn't adjust the ALDA? Everything I have done was in concert with the other. If one thing was left out gains would have been less, including NOT altering the air intake restrictions.

__________________
'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R

This is easy enough to settle. Don't change anything else, just reinstall the original intake. Measure acceleration time to any speed, say 62 (calibration is NOT required for a comparison).Reinstall your new intake set-up. Measure time to the same speed. Report if desired.

It may be impossible to determine how much was due to the ALDA adjustment that he did along with his first intake mod, true. But note that he dynoed it again after modifying the intake again (and no other changes) and gained another half horsepower.

It should also be pointed out that, whether or not you believe less restriction will help in and of itself, the mod allows the air to come in cooler (less tubing, farther from the engine = less heat picked up from the engine).

Another thing to note is Tony's last statement, "On my car reducing turbo lag is the difference this kit provides." One or two extra horsepower is nice and all, but getting more power SOONER is more important (to me anyway).

I'll try to do some 0-60 tests with my TD when I do the mod, but it's hard to find flat empty roads around here that have a high enough speed limit... Maybe a freeway onramp around midnight .

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'81 300TD Wagon 355k (Miss Diesel)
'83 300SD 180k
'84 500SEL 190k (Parting it out)

Over my objections my son put a k&n filter in. Well I was wrong The car sounds better looks better no longer has that rattling big air cleaner. And the filter is made to be cleaned not thrown away. He also is putting a electric fan in over my objections I bet it improves at least 3 things not the least of which is being quieter. You may not gain HP but there are other things that can be improved on. If Mbz did it right the first time why don’t they still have blow buy go straight into the turbo with vacuum hooked to the intake and no way to return blow by oil to the crankcase which is the way the first turbo models were done. Does any one know why they had so much vacuum going to the air cleaner at first? I have always been curious about that
Dave San Jose Ca

"This is easy enough to settle. Don't change anything else, just reinstall the original intake. Measure acceleration time to any speed, say 62 (calibration is NOT required for a comparison).Reinstall your new intake set-up. Measure time to the same speed. Report if desired."

Never going to happen.

__________________
'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R

Why?

Have you read through my entire post? That was well worth the effort but not something I'd want to do again!

emissions swap...part one

__________________
'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R

No, I had not read your other thread. Regardless, what Dr. Booth was asking was if the change in intake restriction (only) really had gained you anything. Frankly, I was hoping to see that someone else had some real before and after comparisons.

Troubleshooting a boost problem a couple of weeks ago I did a couple of runs both with and without the U-shaped tube on. Average of the runs were within a couple of tenths of a second of each other, very slightly favoring removing the tube. But the results were so close and the total scatter in the data was a good bit larger than the difference that I really don't think the test was meaningful. Feathering throttle on a bulky transmission was a significant part of my problems.

Dr. Booth's advice and doing the acceleration runs was very helpful the other day when I posted about the boost problem. I think he is exactly right about the wastegate limiting peak horsepower in the face of lowered intake restrictions. I wonder, however, if an improvement in spool-up is possible. My results, although questionable, say it doesn't matter but I hope to find more real information.

And I would like to get rid of that rattling pile of junk as much as the next person. Makes a good running car sound like its going to die in the middle of the street. Can't justify going without it and theres nothing particularly impressive about a K&N type to justify the $40 when a piece cut out of the screen door would probably do as much. Particularly in the middle of this Sonoran desert dust.

Lots of good information in your other thread, particularly as my car is a 1984 300D Calif, displaced to AZ (that's offroad, right?).

It has to let the turbo spool up faster. Take a old paper towel tube and keep it open at one end. See how long it takes you to take a full breath. Now try it with the other end partially blocked. I know that on the car you have the exhaust pressure pushing the turbo. But without that restriction it will spin a little more freely.

__________________
'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R

I am interested in intercooling my 617.951, but I will have the fuel mixtured adjusted and the boost increased.

Maybe if I could get 5 people together, I could talk my brother into making them, the intercooler, piping, etc.

How much would it be worth to people (be realistic)?

__________________
Current Stable:
1994 S500 v140, 210k miles, white with grey.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold (rumor has it, that it has 750k miles on it now)
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 "300E" Amg Hammer 88k mi sold (it was really a 200, not even an E (124.020)
1992 500E 156k mi sold
etc.

Austin, if you can get your brother to make intercooler piping for a W124 87 300D, I think you can easily get 5 people interested. That would be me, Dave, and a few others, I forgot the names of.

start another thread for the 603, and lets see how much interest there is.

__________________
Current Stable:
1994 S500 v140, 210k miles, white with grey.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold (rumor has it, that it has 750k miles on it now)
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 "300E" Amg Hammer 88k mi sold (it was really a 200, not even an E (124.020)
1992 500E 156k mi sold
etc.