617 IP Full Load Stop Adjustment Procedure - Page 15 - PeachParts Mercedes-Benz Forum

#**211** 08-03-2005, 01:17 PM

Quote:

Originally Posted by gsxr

So basically it's about equal to a stock 87 300D now, huh? Not bad!

The lower gearing (3.07, vs the W124's 2.65) probably helps.

If you are going off of the 0-60 being 11.5seconds...

Then it is faster than a 87 300D

If you are going off of what it is like straight line, dead stop, etc...then they are probably pretty close.

And a rip roaring 283,350 miles to boot

Hit Man X · #**212** 08-03-2005, 04:49 PM

Great info and the top end gains are very suprising!

boneheaddoctor · #**213** 08-03-2005, 05:12 PM

I need to lean out the midrange so I can get more to the top end....I peak EGT at low boost conditions (les than 5 psi) before I hit problems at full boost.

WANT '71 280SEL · #**214** 08-03-2005, 07:40 PM

I found next summer's project...

Thanks
David

Hit Man X · #**215** 08-03-2005, 08:46 PM

Should be interesting how much quicker a 603 can get prior to an IC install on a stock turbo and stock IP.

gsxr · #**216** 08-03-2005, 09:53 PM

Quote:

Originally Posted by Hit Man X

Should be interesting how much quicker a 603 can get prior to an IC install on a stock turbo and stock IP.

I've turned mine up a little with no intercooler, but water injection is planned for this month. Click the photo below for acceleration data... note the 0-60 time is a little over 9.0 seconds, which is a solid 1.0-1.5 seconds faster than before I fiddled with the full load screw. Time to 100mph is a good 3-4 seconds quicker. Quarter mile times are approx 16.8 @ 82mph, had been 17.4 @ 79mph or so.

Hit Man X · #**217** 08-03-2005, 10:33 PM

Quote:

Originally Posted by gsxr

I've turned mine up a little with no intercooler, but water injection is planned for this month. Click the photo below for acceleration data... note the 0-60 time is a little over 9.0 seconds, which is a solid 1.0-1.5 seconds faster than before I fiddled with the full load screw. Time to 100mph is a good 3-4 seconds quicker. Quarter mile times are approx 16.8 @ 82mph, had been 17.4 @ 79mph or so.

Hrm... I forsee at least 250° drop in EGTs with an IC, heck it could be more. A large downpipe could help too as now we're getting up there in fuel delivery too.

DslBnz · #**218** 08-03-2005, 10:33 PM

Quote:

Originally Posted by gsxr

I've turned mine up a little with no intercooler, but water injection is planned for this month. Click the photo below for acceleration data... note the 0-60 time is a little over 9.0 seconds, which is a solid 1.0-1.5 seconds faster than before I fiddled with the full load screw. Time to 100mph is a good 3-4 seconds quicker. Quarter mile times are approx 16.8 @ 82mph, had been 17.4 @ 79mph or so.

I can't claim any personal technical achievement, Dave. That is just about equal to what I get in my SDL. 0 - 60 in the 9's, and to 82 in around 17 seconds(it feels even faster, but it's not). This is provided that environmental and road conditions permit.

Mercedes had two TSB out where they adjusted the full load quantity and maximum engine speed. This applied to 603 engines. Around the time of this being issued, my SDL received a new IP. Whatever that means.

Although I have not cracked it open yet(no pyro, and I am more than satisfied with performance from this big car), I think the IP may have been tweaked sometime in the past. Forget that. I know it must have been, because a 3950 lb curb weighted car would not accelerate that well.

Brandon: I am really impressed by that video. Is that 80-90 mph time done without any extenal influencing factors? I mean, 80 - 90 mph in around 3 seconds, is absolutely insane for top gear. Also, I notice the speedometer is that from an '85, but yours is an '81. I know the differential for the '85 = 2.88 vs 3.07. I also noticed that the car shifted(or you) at 75 - 76 mph. Have you raised the maximum engine speed? Or have you switched the differential?

I haven't read the bulk of this thread. Certain things catch my interest once in awhile.

Hit Man X · #**219** 08-03-2005, 10:46 PM

If I had a speedo (well the extra is from a 280SEL so it's just a bit off

) I could compare my SDL for the name of "science"... those vids it really seems to run well!

#**220** 08-04-2005, 01:16 AM

Quote:

Originally Posted by DslBnz

I can't claim any personal technical achievement, Dave. That is just about equal to what I get in my SDL. 0 - 60 in the 9's, and to 82 in around 17 seconds(it feels even faster, but it's not). This is provided that environmental and road conditions permit.

Mercedes had two TSB out where they adjusted the full load quantity and maximum engine speed. This applied to 603 engines. Around the time of this being issued, my SDL received a new IP. Whatever that means.

Although I have not cracked it open yet(no pyro, and I am more than satisfied with performance from this big car), I think the IP may have been tweaked sometime in the past. Forget that. I know it must have been, because a 3950 lb curb weighted car would not accelerate that well.

Brandon: I am really impressed by that video. Is that 80-90 mph time done without any extenal influencing factors? I mean, 80 - 90 mph in around 3 seconds, is absolutely insane for top gear. Also, I notice the speedometer is that from an '85, but yours is an '81. I know the differential for the '85 = 2.88 vs 3.07. I also noticed that the car shifted(or you) at 75 - 76 mph. Have you raised the maximum engine speed? Or have you switched the differential?

I haven't read the bulk of this thread. Certain things catch my interest once in awhile.

Hey,
I swapped in a 0-120MPH speedo in place of my 85MPH max one.
The difference in accuracy was marginal as my tires are a tad larger.
Its probably 2-3MPH off max depending on speeds.
That was all on a flat road...the 80+ speeds are REAL quick...I wasn't running full pedal on that either.

I still want to try to get some videos with my pyro in them.....I have tons but there was so much traffic that it is hard to really open it up regularly.

4th gear will throw you back when it shifts up...the shifts listed on the speedo are for the SDL I presume however I haven't played too much with it though..

It seems to shift a bit early generally...haven't touched the idle/max adjustments one bit...

gsxr · #**221** 08-04-2005, 11:38 AM

Increasing the max RPM will only increase your top speed, and your peak speed in each gear, which is handy for autocrossing or roadracing. But for max acceleration, upshifting around 4800-5000 is optimum, due to the limitation of indirect injection burn rates... they just don't make a lot of power past 5k or so. Look at the Finn's SuperTurbo dyno sheets - gobs of power, but above 5k it drops like a rock.

Hit Man X · #**222** 08-04-2005, 03:39 PM

How accurate is the stock tach? I'd assume pretty close... my SDL is upshifting at ~4600rpm, just how the SD is. Not sure if this is normal now or not.

gsxr · #**223** 08-04-2005, 04:08 PM

The stock tach is pretty accurate. The trannies behind 617's seem to upshift sooner, say 4600 or so, and upshift WAY early out of 1st gear (about 4000rpm usually). The trannies behind the 603's generally upshift at 4800-4900 in all gears.YMMV, etc...

DslBnz · #**224** 08-04-2005, 04:15 PM

What about this Dyno sheet from the OM603 190 Superturbo with 482 hp?

The powerplant...

Hit Man X · #**225** 08-04-2005, 05:09 PM

Quote:

Originally Posted by gsxr

The stock tach is pretty accurate. The trannies behind 617's seem to upshift sooner, say 4600 or so, and upshift WAY early out of 1st gear (about 4000rpm usually). The trannies behind the 603's generally upshift at 4800-4900 in all gears.YMMV, etc...

My 617s shifts ~4600 every gear...

The dyno I have from a member on here of the HP on a 617 it's pretty flat from 3800-4800.

As I recollect from vehicles with a TV/Bowden cable, the cable is there for part throttle shift points and line rise. But max shift points are set by an internal governor correct? At least on Ford AODs and GM 700R4s I've played with are like this.

Perhaps I'll go for a drive shortly...

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