VW 1.6TD Engine Off Coasting
The service manual for my MK2 1.6TD VW states that damage may occur if towing on the drive wheels at speeds greater than 80kph/50mph. Does this mean engine off coasting above 80kph is harmful for the transmission? I thought only automatic transmissions see damage from engine off coasting. Is this transmission in particular incompatible with high speed engine off coasting? Or is engine off coasting normally not used at these speeds? I've pulsed and glided regularly between 70~110kph on this car for almost 2 years now...should I be concerned about transmission damage?
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My guess is that the manual is in error, or didn't differentiate between the manual and automatic. However, don't hold me responsible for any damage that occurs. :p
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i think it's rather for the safety of towing a car, as towing a car is generally more unstable at higher speeds. A manual box shouldnt give a damn
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Or maybe it means that towing has not been tested above 80kph, so VW only ensures the safety up to that speed?
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Mmm they specifically say it could cause damage to the gearbox. They also mentioned that automatics should not be towed on the drive wheels at all, so the advice for towing at 50mph/80kph+ is intended for manual gearboxes.
There is no restriction of towing speed mentioned when towing on the rear wheels, so this is related to the longevity of the gearbox, rather than the safety of towing at highway speeds (or whether they've tested it to ensure). |
I would be more concerned about shutting off your turbo engine hot, with the turbo spinning wild after your pulse :confused:
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If EOC at those speeds would harm your gearbox, probably would have broken something by now.
How much you save fuel with EOC compared to coasting with the engine running? Just out of curiosity. |
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I'm not sure how much the savings are. |
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I can assure you i didn't mean to offend anyone. :thumbup: |
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Anyways, let's keep this thread on topic - VW's claim that the gearbox may see damage. |
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The money difference is insignificant. |
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Some manual transmissions pump or circulate lube oil when driven by the engine. Some manual transmissions lube properly when driven by the road wheels. My Saturn has a F35 Getrag transmission and has no restrictions on flat tow speed or distance. Is there a distance restriction or strictly a speed restriction on your VW trans. It is a lack of lube issue.
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I see that you understand what VW is saying. You are fine doing what you are doing, unless you can glide 50 miles at a time. LOL
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I agree, it looks like a long-term type of issue. Short periods of EOC should be fine.
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Hmm, I believe there's further misunderstanding here. The condition VW provided is a disjunction, not a conjunction. The distance OR the speed will satisfy the condition of harm. It is the speed (rather than distance) that is relevant here. The negation of the distance doesn't mean the conditions necessary for gearbox harm aren't satisfied. That would only be the case if a conjunction (and) was used.
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Then again, it's a vw so it's probably going to break anyway. :thumbup: |
Those older manual transmissions rely more on splash lube than pressurized lube, so at least in theory EOC or towing above 80km/h shouldn't do any harm.
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Your biggest gains from EOC are at speeds below 50 anyway.
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Likely, the residual oil in the bearings is enough to lubricate adequately UP TO 50 km OR UP TO 50km/hr. Longer distances and higher speeds will run through that residual oil and once gone will cause excessive friction and wear/scoring/gouging on the bearings. This is one of those times where ymmv. Good luck, not worth the effort and small money saved in my opinion. |
Maybe you could try and check with those businesses that sell tow hitches for RVs. They usually have a list of what cars are safe for flat-towing and what ones require some preventive measure to prevent damage to the transmission.
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And BTW, I don't EOC with my VW. I agree, the savings are not worth the risk for me, heh. |
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Some companies such as Remco Industries provide auxiliary lube pumps to prevent transmission damage while flat-towing, and AFAIK there is no such pump available for use in the 5-speed transmission fitted to the Golf. They claim it's safe to flat tow at up to 65MPH according to the manual, but don't give further details.
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