I Just did a 0-60 test on as level a ground as I could find. it's a little up hill actually. and it turned out 9.55 seconds? I thought these cars were supposed to be in the 12-18 seconds. it takes a second or so, to really get moving, then it PULLS HARD and shifts solid, when I get up to 40 it really gets LOUD and then poof I am over 60 MPH. now I know the overboost is disconneted, and my transmission is JUST rebuilt, but I am suprised at the time.
I can also easily pull 85 (*as fast as my 82 Speedo goes) on the highway. I have never had any problems passing anything, and my fuel economy is pretty good.
any ideas why it's so fast?
possible speedo off? I will verify on mile markers on the highway soon. I also have GPS on the laptop, so I can see what it thinks I am doing.
John

I once saw a guy take off like a rocket ship in new york state once with one of those. What was suprising is there was not even a lot of smoke. He was on a parking lot next to a highway. I initially thought he must have been a gas car. But the right label was on the trunk. Anyways the help to slow it down is available here for the asking. I would get the overboost functional. No sense taking risks. It could evolve into a head trip. Edit: sorry I was reffering to an 86 or 87 with the alloy head. I just automatically thought that was what was meant.Until I re read the post.

It's physically impossible for an SD with a 617 to achieve 9.55 seconds in a 0-60 run.

You'd need to have about 165hp or so.......more than a 603........and there is NFW you have it.

I recently ran the SD with a G-Tech Pro and achieved 12.7 seconds in a 0-60 run......and that's a decent time for an SD.

The SDL's run about 10.75 seconds.........or so.

A 603 with an intercooler and the fuel turned all the way up can dip down to about 8.5 seconds or so. This engine has an output of 200 hp.

so do you think my speedo is off that much? I will report back when I get the GPS online and see what it says.
thanks,
John

.........well, it's either the speedo, or the stopwatch........

For all you guys know the PO extensively modified the IP and is running massive boost.

Any idea on the hp on a N/A 603? Ever since I have had this car, I have been reaching the 9-10 second range (hard to get it to tenths or hundredths while shifting the 5 speed and watching the laptop for the gps mph numbers). From what I have read here, those numbers are just a "bit fast". I should just lay down the funds for a g-tech pro or show up at a open night at the local drag strip...

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Fantom71 aka Dale
Madison, AL

91 190E 2.6 5 speed 220k miles and this car still scoots!

John
On the tech board, when speaking of engines haveing a "Sweet Spot", I mentioned that I was able to get 28 MPG averaging about 80 mph from my 84 500SEL because that was where its "Stweet Spot" was. I was told it was impossible, I must be stuped because I must not know how to figure MPG, I was just flat out lying, etc. I won't go on because I believe you get the idea.
Well, Your car is probably set up corectly, has above average power, everything is working as it should, and you are blessed with a great SD.
Every car different. It makes me feel good when someone has a great car and is proud of it.
By the way, no one, I mean NO ONE ask "How did you do that? Would you give away some of your secrets? So I just droped it and deleted my messages because I don't liked to be told "You don't know what you are talking about?"
If you want to sell that SD, let me know. I may be interested.

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84 500 SEL (307,xxx miles)

The people that frequent these boards are realists. They like to see proof of how something was accomplished, and how they could manage the same with their cars. I can empathize with them. But for now, I'll take your word for it.

My SDL runs to 60 mph in less than 9 seconds (on summer fuel). That much I'm CERTAIN. If I can figure out an innovative way of securing the GPS and digicam properly, I can prove it more concisely (tried to even present the road grade visually).

I know for a FACT that the IP rack has been advanced (at full load), indicating a full load stop increase. The idle was retarded along with it. One screw turns the full load out, the other keeps the idle at a reasonable level. Both NEED to be turned at the same time to compensate for each other. I have not touched the internals of the IP (mine) myself, but I have compared one IP to another IP (spare rebuilt from my father). The latter I have heavily tweaked. But I always document my tweaking so that I can revert back to stock settings.

Anyway....Do I believe you, about the 28 mpg? Sure I do...
Do I believe an SD can accelerate to 60 in 9.55 seconds? Of course...
Have you given me reason to doubt? I have seen some E300's that give E320's a run for their money, and some 560SEC's, US Spec, putting out almost 280 crank hp on the dyno. Search the archives over on benzworld, this is the truth.

There are so many variables to the equation, anything can be possible and frequently is.

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1987 300SDL (324000)

1986 Porsche 951 (944 Turbo) (166000)

1978 Porsche 924 (99000)

1996 Nissan Pathfinder R50 (201000)

125hp is 125hp, simply no way around that. Of course cars are not like computers and results may vary. Now if he said 11 seconds and his fuel and boost were turned up, maybe timing played with a bit, then I'd beleive it.

Your SDL is not stock, so of course that changes things. Plus 603's are up 25hp on the 617's, assuming everything is stock.

For example their is an argument that if you retard IP timing to 14ATDC on a 603 you might gain a bit. Mine is at 15ATDC, may or maynot knock another degree off that, I'll let the TC break in first.

So lets do this for this hot SD. What is your turbo putting out? What is the IP timing? What is the cam to crank timing? I am also assuming that your injectors have been checked and are in proper order. Valves adjusted goes without saying. What about the ALDA? Is the cap still on it or has it been played with? Can you get it on a dyno for some numbers?

Now most 617's I see have original injectors, never touched, timing never checked, ect. They are out of tune and tired, period.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200

I hope you mean BTDC (Before Top Dead Center).

Nope.

603.971 15+/- ATDC
603.970 14+/- .5 ATDC
617.951 15 +/- ATDC

All using RIV method, 603's can only be timed with the RIV.
617.951 using drip method, +24+/-1 BTDC

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200

I have not done much performance wise to the car at all. I have not even adjusted the valves since I got the car 5 years ago, but it has not been driven at all except for the last 3 months. and since then, all I have done is clean it up and work on the electrical parts that don't work.

I read several posts that said to do a 0-60 and when I did I was amazed, so I have done it a couple more times and unless I am a complete idiot with a stopwatch...(it is possible ) the worst time I have gotten is 10.14, I still have not gotten the GPS set up to verify the speedo, but traffic and other cars I have driven in make me think the speedo is pretty close.

My reason for the post is not to brag on how fast my car is, but to see if there is something to worry about, or if I should be checking the vehicle over for ailen technology.
the only thing unusuall is the overboost disconnected. I looked at the IP and there are scribe marks on the block and the IP, so it probably has had the timing set. but not by me. I know personally the PO and it was a large woman in her 50's so I doubt perfomance enhancing has been done to this car. She is wealthy, and it was serviced regurly by a local indy, so possibly the indy modified the turbo wastegate and alda to give her more gasser like performance. it does not smoke or burn oil. there are drip marks where ever I park the car. when I punch the go pedal for the test, the engine actually roars and everything shakes as it pulls through the first two gears. 60 comes up well before 4th gear. also, several posts say you will not hear the turbo whine while driving the car. my car has a noticable turbo whine on the freeway, but then again, I drive with my windows down... is it normal to be able to hear the turbo whine?
John

Maybe a free flow exhaust has been installed at some time?

- Peter.

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2021 Chevrolet Spark
Formerly...
2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021
2002 Kia Rio. Worst crap on four wheels
1981 240D 4spd stick. 389000 miles.
1984 123 200
1979 116 280S
1972 Cadillac Sedan DeVille
1971 108 280S

You should, I would. You have a kick ass car. Maybe speedo error, but even still, it'll probably be around 12 (I'm guessing.)

Let us know when you find that alien technology, that would be cooler than the sub ten 0-60.

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B
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1983 300SD