How fast do you drive your 240D.... ?? - Page 4 - PeachParts Mercedes-Benz Forum

Old300D · #46 10-24-2004, 10:18 PM

Quote:

Originally Posted by Angel

(back on topic)

This thread is about us 67hp 4cylinder biotches, all of ya'll with turbo 5's can just go adjust your alda or something =)

-John

Hey! My car is a 240D. But I can drive @ 110mph because of the 2.88 and the 617.952. No need to discriminate.

mbzkid · #47 10-24-2004, 11:47 PM

So the manual trans cars have a lower top speed?

Is the gearing the same for the rest of the gears?

Angel · #48 10-24-2004, 11:55 PM

Quote:

Originally Posted by oldnavy

So clue me in as to where you got your injector's from, I'm about due a injector job.

I went to a local place here in cincinnati. "Diesel Injection service" (its on reading rd near the hospitals if you are familiar w/ cincinnati) handed them 4 injectors from my "parts 240D" and asked them to pop them. The guy came back about 20 minutes later saying they all needed new nozzles (no surprise to me). Diesel inj. svc. has all kinds of truck parts in a single displace case, turbos, $250 ford injectors (lol...sorry ford guys) and a few broken turbos (cool to look at). Most of the building is a downstairs shop and shelves/front lobby/an office upstairs. The guy that sits in the office (runs the place) is an AF reservist so I'll give them some money once- $350 for new nozzles, tested and balanced all around. 4x$38 nozzle and 2h labor to do all 4 injectors. Not cheap...

Fastlane sells nozzles, (and maybe whole rebuilt injectors), but not the tools to balance and match them.

-John

Angel · #49 10-25-2004, 12:01 AM

Quote:

Originally Posted by mbzkid

So the manual trans cars have a lower top speed?

Is the gearing the same for the rest of the gears?

No, manual 240D's are rated to go 87 or 88 per the factory. Auto 240D's are a couple MPH slower (the number is a few posts back...)

Either way, the factory top speed is factory redline in top gear. What hasn't come out in this thread is that the IP will let you rev **past** redline, so a 240D (esp. a stick) will peg the speedo and keep accelerating (as slow as 240D's accelerate =)
I dont think the IP (or the engine stress) will let you do 100mph in a 240D, but 90 ("verified" against an outside source, the stock 240D speedo only goes to 85 and the term "verified" is used loosely here...) shouldnt be out of the question. Whats also missing is grade. If it is uphill at all, you wont see 80 in ANY 240D
(unless some errant forum member put a 5cyl turbo in there, in which case we need to trade cars so he can remember what humble pie tastes like, I've had enough thank you

(no offense intended old300D)

-John

Old300D · #50 10-25-2004, 12:59 AM

No offense taken. As a matter of fact I got my first drive in a manual 240D today (and my first drive in a manual 300D turbo too), courtesy of TomJ. I was very surprised how well a little 4 cylinder diesel goes when it is running right. It was way faster than my old 300D with an automatic. I have nothing but respect for the car.

OhioMercedesBoy · #51 10-25-2004, 11:36 AM

You all are killing me! If I don't get to take a 240D for a spin soon I am going to explode. There's a W115 for sale about 2 miles from here... but it's kinda shoddy looking and I am only interested in the W123, so that wouldn't do me much good.
~D.J.~

Hatterasguy · #52 10-25-2004, 12:55 PM

240D top speeds!

I put my foot down in the SDL today at 80 and she pulled like a train to 105, but I ran out of room!

Sorry I couldn't resist!

A 240D would be a fun cruising car it's not about speed it is about style and looking cool.

CannonBall · #53 10-25-2004, 03:22 PM

I've had mine pinned @ 85, but that was downhill. It CAN hit 80+ easy at sea level, but here at a mile high I cruise at 70-75, funny cause I still pass most of these crappy CO drivers. That said, at sea level the previous owner ran a 25 second 1/4 mile at 55mph...here in boulder it takes me about a mile to get up to 65, that is on a slight grade and 300k+ miles.
-Nate

CannonBall · #54 10-25-2004, 03:29 PM

Quote:

Originally Posted by The Warden

I'm not sure it's feasible to put it between the manifold and turbo on an OM617, though, with how the exhaust feeds the turbo...but I haven't looked closely either (haven't had the $$ to put a pyro in my car yet). If the thermocouple is mounted after the turbo, you'll need to take a few hundred degrees off of the maximum safe temperature, and be aware that the gauge will be somewhat slower to respond than it will with the thermocouple mounted before the turbo. Otherwise, it's not a serious issue...really, it's a matter of personal preference more than anything else.

As a general rule, if the thermocouple is mounted "before" the turbo (or on an n/a engine), you don't want to be over 1000° for extended running, and never exceed 1250° or pistons will start melting. For an "after" turbo mount, I would want it to stay below 700° or so for extended periods of time, and don't ever exceed 1000°. With my pre-turbo EGT gauge, I don't let it exceed 1100°, and that gives me a slight cushion in case something happens or in case the gauge is slightly inaccurate. This said, though, the lower the EGT's are, the less the engine's working...so you can tell if you're lugging the engine; if you downshift and the EGT's go down, the engine didn't want to be in the higher gear.

When I was helping my friend put the EGT gage on a cummins they were telling him as a rule of thumb add 200* to the reading, but it can vary by up to 400. The disadvantage to putting it before the turbo is that the thermocouples sometimes become brittle and break, and some people aren't too keen on sending metal parts through their turbo. I think this has convinced me to put an EGT gage on my 240d though, just to watch what's happening.
-Nate

The Warden · #55 10-25-2004, 03:51 PM

Quote:

Originally Posted by CannonBall

The disadvantage to putting it before the turbo is that the thermocouples sometimes become brittle and break, and some people aren't too keen on sending metal parts through their turbo.

I've heard this too, but from the best I can tell, it's a one-in-a-million shot (i.e. I've heard that it's theoretically possible, but have yet to hear of it actually happening to anyone and resulting in turbo damage), and I figured that the chances of that happening are outweighed by the variances in temperature between the two sides of the turbo (and the potential problems that can arise).

Just my opinion on the matter

Old300D · #56 10-25-2004, 04:05 PM

If you can stand to use a thermocouple inside an inconel or stainless tip, there is no chance of any pieces coming off. Of course your response time is slowed, but we are not drag racing here, right? It is much more important to read the exhaust temperature accurately and directly, rather than wondering what the drop across the turbo is.

diametricalbenz · #57 10-25-2004, 06:10 PM

I decided to join the 240D madness and bought a w115 bodied 4 speed last month

I tried running it flat out on a level section of freeway here in Los Angeles and I could only get 77MPH! Should I be able to run at 87-88mph?

oldnavy · #58 10-25-2004, 06:16 PM

Quote:

Originally Posted by diametricalbenz

I decided to join the 240D madness and bought a w115 bodied 4 speed last month

I tried running it flat out on a level section of freeway here in Los Angeles and I could only get 77MPH! Should I be able to run at 87-88mph?

Lot's of variables are involved here, condition of your engine/fuel system, quality of fuel you are using, type of tires and air preasure. Low cetane fuel alone can cause you loss speed.

diametricalbenz · #59 10-25-2004, 07:20 PM

Quote:

Originally Posted by oldnavy

Lot's of variables are involved here, condition of your engine/fuel system, quality of fuel you are using, type of tires and air preasure. Low cetane fuel alone can cause you loss speed.

The engine is fine according to my mechanic. I just had the fuel filters changed. I am currently running a blend of Power Service and diesel. Can anyone else reccomend a cetane booster that works for them? Is there a way to check the cetane level of the fuel? Come to think of it the tires are 205's that the previous owner had put on and not the original width (185mm??).

flash123 · #60 10-26-2004, 06:28 AM

Somebody said 112 mph. That coincides with my recollection of a factory rating I read somewhere. It could happen, downhill with a tailwind, maybe.

My '80 240D does well over 70 on level road but how much more I have no way of knowing, and I don't need to know.

It sounds happy at 60, so that's what we do.

What suprised me is that at altitudes up to around 7,000 feet on route 395 over the sierras, it has almost as much ability to climb an back home at 1,000 feet.

OK it doesn't climb worth a hoot at sea level either. I just pull into the truck lane in 3rd gear and enjoy the ride.

On the fuel / air question?

My IDI Econoline 7.3 belches black smoke at higher elevations. I go around the mountains instead of over them. I strongly suspect if I could get more air into it It would not heat up so much. My wife's DI Power Stroke Econoline 7.3 has no trouble with elevation. The turbo is certainly part of it, but the Power stroke is a totally different engine.

I'm not about to invest $3,000 for a turbo on a 12 year old truck with 200,000 miles on it, but I have thought about making a hood scoop. I might get another 100,000 if I'm lucky but those older engines are no match for the Power Stroke series.

As to the pyro, if my foot gets hot, and it does when the coolant temp starts to climb, I know to back off.