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W210 N/A Diesel RPM on Highway
Hi. I just test drove a 1996 E300D (vacuum controlled 4-speed). It was my first time behind the wheel of a W210 diesel. I was surprised that the tach showed 3,000 RPM at 70mph. Is this normal? My 2006 (old style) Jeep Wrangler's 4-speed auto shows about 2,200. There is a 1997 E300D for sale and I know it has the electronically controlled 5-speed auto. Does this transmission reduce the RPMs at highway speed with an overdrive 5th gear ratio, or does it just have different (and an additional) gearing on the low end for acceleration?
Thanks!!
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NOW: 2017 C43 AMG, 2006 Wrangler Unlimited Rubicon, 1966 230SL, 1980 450SL (for sale!) PAST: 2006 C230, 1997 E300D, 1994 E420, 1994 Neon Spt Cpe, 1984 300ZX, 1983 Celica GT, 1976 Electra Limited, 1984 Honda Nighthawk 650, 1979 Suzuki PE175, 1978 Suzuki DS100 www.mbca.org - www.sl113.org - www.ohio4x4.com |
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If it still has the 722.3 or 722.4 transmission, that is probably normal. My SDL runs ~3100 at 75MPH. Keep in mind that the mechanical transmissions don't have a lockup torque converter, so there will always some some degree of "slip".
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Quote:
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CENSORED due to not family friendly words Last edited by tjts1; 08-16-2017 at 12:04 PM. |
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Only diesels in this driveway. 2005 E320 CDI 243k Black/Black 2008 Chevy 3500HD Duramax 340k 2004 Chevy 2500HD Duramax 220k |
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Quote:
http://i.imgur.com/CjpIGYg.jpg It's all in the diff ratio.
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His '97 runs as show in the link.
Darn it! I didn't Google it first. Answers are here: https://en.wikipedia.org/wiki/Merced...c_transmission https://en.wikipedia.org/wiki/Merced...c_transmission Well, the entry for the 4G doesn't show all the gear ratios, but it does say the overdrive 5th gear was added. I assume gears 1-4 are basically the same. Also, the 5G page says that it is a lock-up torque converter. From this, and from what you guys confirmed, I deduce that the 1997 would get better highway fuel economy than the 1996. I've read some people don't like the electronically controlled 5G-Tronic vs. the hydraulically operated 4G-Tronic. I assume there are people who argue on behalf of both sides? This is in regards to longevity and reliability. Thanks,
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NOW: 2017 C43 AMG, 2006 Wrangler Unlimited Rubicon, 1966 230SL, 1980 450SL (for sale!) PAST: 2006 C230, 1997 E300D, 1994 E420, 1994 Neon Spt Cpe, 1984 300ZX, 1983 Celica GT, 1976 Electra Limited, 1984 Honda Nighthawk 650, 1979 Suzuki PE175, 1978 Suzuki DS100 www.mbca.org - www.sl113.org - www.ohio4x4.com |
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I bought the 97 specifically because of the 722.6. 97 was the first year for the 5spd and the last year diesel that doesn't require biannual smog check in California.
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TJTS1,
How long have you had your '97? Any transmission problems? What has given you problems? The one I'm looking at has just under 100,000 miles, is being sold through an M-B dealership, and is supposedly a local trade in that they have service records on (they're verifying). It seems it may be worth a retail price. General question to all, I know the '96 I looked at this week had the engine wiring harness replaced (owner showed me old one and the new one installed). Does the 97 have the same bio-degradable material that goes bad?
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NOW: 2017 C43 AMG, 2006 Wrangler Unlimited Rubicon, 1966 230SL, 1980 450SL (for sale!) PAST: 2006 C230, 1997 E300D, 1994 E420, 1994 Neon Spt Cpe, 1984 300ZX, 1983 Celica GT, 1976 Electra Limited, 1984 Honda Nighthawk 650, 1979 Suzuki PE175, 1978 Suzuki DS100 www.mbca.org - www.sl113.org - www.ohio4x4.com |
#9
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Only other issue has been rust around the window frames (SoCal car all it's life!) hidden underneath the rubber door seals, rust around the battery, rust on the body near the front control arm mounts. Check the plastic crankcase ventilation fittings going into each intake runner near the head. There are 12! They all crack and fail and allow dust into the intake. The whole crancase ventilation system is dumb and the intake loads up with egr soot and oil which kills power. Remove and clean out the intake to restore stock power. I've only found biodegradable wiring inside the headlight housings causing intermittent bulb out warning.
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#10
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Replace the connector with the revised unit just to do it when you get the car and change the ATF periodically and the 722.6 is fine. Mercedes didn't develop the 722.6 as a step backwards from the 722.3/.4 You mention an earlier trans with an overdrive. That's the 722.5 which is a .4 with an overdrive tacked on the back, it never made its way into the W210 diesel so disregard that.
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68 280SL - 70 280SL - 70 300SEL 3.5 - 72 350SL - 72 280SEL 4.5 - 72 220 - 72 220D - 73 450SL - 84 230GE - 87 200TD - 90 190E 2.0 - 03 G500 Nissan GTR - Nissan Skyline GTS25T - Toyota GTFour - Rover Mini - Toyota Land Cruiser HJ60 - Cadillac Eldorado - BMW E30 - BMW 135i |
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Hey Paul,
If I mentioned an older 5-speed, then I must have been writing in an unclear manner. I know the 722.6 is what's in the 97-99 E300D. Thanks for the tip on the wiring harness seal. Cool little detail to know. TJTS1, I know about spring perches rusting - my W124 E420 had that failure. And I knew about rust behind the rubber door seals - that's the only place I found rust on the 96 I just drove. I'll have to start checking battery areas and front control arms. Thanks for the alternator upgrade suggestion!
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NOW: 2017 C43 AMG, 2006 Wrangler Unlimited Rubicon, 1966 230SL, 1980 450SL (for sale!) PAST: 2006 C230, 1997 E300D, 1994 E420, 1994 Neon Spt Cpe, 1984 300ZX, 1983 Celica GT, 1976 Electra Limited, 1984 Honda Nighthawk 650, 1979 Suzuki PE175, 1978 Suzuki DS100 www.mbca.org - www.sl113.org - www.ohio4x4.com |
#12
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2800 rpm at 80 mph in mt 98 E300.
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Jim |
#13
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E250 with 2.1 liter 4 cylinder engine.... 1800 RPM at 80 MPH. I've climbed some pretty good hills out west and it's never had to downshift to make the grades. Simply amazing.
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98 Dodge-Cummins pickup (123k) 13 GLK250 (135k) 06 E320CDI (323K) 16 C300 (62K) 82 300GD Gelaendewagen (54K) |
#14
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If memory serves, the 5 speed variant in the '97 E300 diesel turns around the same rpm in top gear as does the 4 speed. The later turbodiesel is geared taller. 3.46 vs 3.07 differential gearing respectively.
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1987 300SDL (324000) 1986 Porsche 951 (944 Turbo) (166000) 1978 Porsche 924 (99000) 1996 Nissan Pathfinder R50 (201000) |
#15
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I run about 2900RPM at 70mph in 95 E300.
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-- Chris '95 E300, 216k miles, Silver Surfer '05 E320 CDI, 138k miles '07 S550 4matic, 69k miles Gone but not forgotten: '76 300D, 350k miles?, SOLD in 1995 '75 240D, 300k miles, SOLD in 1991 |
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