82 300CD - performance/power modifications possible??? - Page 2 - PeachParts Mercedes-Benz Forum

derherr65 · #16 09-17-2006, 12:30 AM

The OM617 has about 125 HP in stock form, right?
What would a variable turbo, intercooler, and fuel mods make without blowing head gaskets or melting things?

#17 09-17-2006, 12:56 AM

Quote:

Originally Posted by derherr65

The OM617 has about 125 HP in stock form, right?
What would a variable turbo, intercooler, and fuel mods make without blowing head gaskets or melting things?

The stock IP is pretty much maxed out around 200HP at the flywheel (180ish at the wheels). I haven't done this myself, but it's what I've learned from the Finns. At that point you need larger pump elements to get any more HP out of it. I have not touched the IP internal adjustments yet, but I have 102.7HP at the wheels according to my last dyno session.

"Intercooler"
I plan on going with an air-to-water intercooler. It's still in the design phase because of limited $$$.

derherr65 · #18 09-17-2006, 01:17 AM

I've seen some impressive video, but have not found the site. Doe the "finns" have a site?

#19 09-17-2006, 01:23 AM

Quote:

Originally Posted by derherr65

I've seen some impressive video, but have not found the site. Doe the "finns" have a site?

Their english forum.

derherr65 · #20 09-17-2006, 01:26 PM

Great link, thank you.

Just to make sure I'm not going about this the wrong way, is there a better choice in '80 something mercedes diesels for a peppy daily driver?

82 300CD, about $2500, 120 Hp, about 3600lbs, 25mpg, potentially 180-200HP while maintaining daily driver traits.

Can another model match or beat this?

Hatterasguy · #21 09-17-2006, 01:39 PM

Quote:

Originally Posted by derherr65

Great link, thank you.

Just to make sure I'm not going about this the wrong way, is there a better choice in '80 something mercedes diesels for a peppy daily driver?

82 300CD, about $2500, 120 Hp, about 3600lbs, 25mpg, potentially 180-200HP while maintaining daily driver traits.

Can another model match or beat this?

Enjoy the car for what it is, if you want a faster MB diesel a 1986-87 300D is the fastest for that vintage.

Very interesting read, now the queston that begs to be asked is how hot can you let the EGT's get on these engines? Hmm it would be an interesting experiment to do with a dieing 617, or 603. However increasing EGT's would certainly decrease engine life, this is another aspect to consider.

TheDon · #22 09-17-2006, 01:54 PM

Quote:

Originally Posted by Hatterasguy

Very interesting read, now the queston that begs to be asked is how hot can you let the EGT's get on these engines? Hmm it would be an interesting experiment to do with a dieing 617, or 603. However increasing EGT's would certainly decrease engine life, this is another aspect to consider.

you didnt happen to see the info forced found and posted regarding EGT's....

#23 09-17-2006, 03:24 PM

The OM617 is not a good platform for "performance". Like I said in my PM to you, it's design can be traced back into the 50's. It's very limited for air-flow through the head. A stock 87 300D or 190D can walk all over most any "modified" 82-85 300D.

The only reason I'm going as far with mine is it's all I've got. I don't have the resources ($$$) to just go out and buy an 87 300D to play with.

If I had known back when I was first looking for a car what I know now, I'd have gotten an 87 190D 2.5T or an 86-87 300D.

derherr65 · #24 09-17-2006, 05:51 PM

I have a similar situation. Looks like I can trade a 11mpg '77 F150 for the Mercedes. My daily drive is 35 miles minimum each way and a rusty '70s F150, though one hell of a stout runner, just doesn't look right in an executive parking lot. Not to mention the whopping 11.7mpg!
What can I say, it's a compulsive sickness, gotta make more power. Naturally I'll get everything running properly before playing with anything. Never know, the IP chain could be stretched enough to throw off the timing. I hear that alone would make a world of difference in performance.

Hatterasguy · #25 09-17-2006, 06:35 PM

As Brian and I have proved a 300SDL in tune is a will run to 60 in the mid 10 second range, remove the ALDA and it will knock a second off that.

So I think its fair to say that a 1987 300D in good tune, with the ALDA removed should run to 60 in about 9 seconds flat. You have to do a lot of tuning on any 617 to get close to that. That same effort put into the 603 will knock about another two seconds off its time.

#26 09-17-2006, 06:37 PM

Quote:

Originally Posted by derherr65

Never know, the IP chain could be stretched enough to throw off the timing. I hear that alone would make a world of difference in performance.

Yes, if the chain is stretched a few degrees and the cam and IP have not been adjusted for it. The IP and cam timing will lag behind the pistons and have a big negative on performance and economy.