Why no bids ?

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Re: Why no bids ?

Postby silverbullet » 28 Jul 2019, 21:46

Front and rear final drives (front diff, rear transaxle) have to be the same or you will destroy the VC and end up with very odd driving characteristics for the short time it survives.
Seek out the 80-90 syncronauts at Malvern and they'll see you right.

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Re: Why no bids ?

Postby Dobble » 29 Jul 2019, 06:35

Thanks Silver, I’ll be phoning Coast VW today to see if they have any info on what work was carried out to the box. It’s got a decoupler so I’ll just use 2wd until I’m sure what’s going on with it. Is the Malvern syncronauts a Facebook based group? Just wondering as I’m not on any social media apart from a few forums.

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Re: Why no bids ?

Postby jebiga41 » 29 Jul 2019, 08:55

Dobble wrote:Well the van is now in my possession. I went to have a look more for interest than anything else as we already have a Syncro that's having a restoration. The chap who owned it had over 10k of receipts from Coast VW and had spend many more thousands on bolt on bits. The issue with the gearbox was that it munched one of the gears and needed a rebuild which was done by Bear Motorsport via Coast VW. The issue is that they fitted the wrong gear set or wrong crown and pinion hence why it tops out at 60. We'll live with it for now though.

Overall it's fairly sweet for a van that's nearly as old as me and it has some really nice bits. We're really happy with our purchase and it means we can get out camping as our restoration is taking longer than planned.

sounds very dodgy wouldnt run it in 4 wheel drive until you know what they did
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Re: Why no bids ?

Postby Dobble » 29 Jul 2019, 09:15

[/quote]sounds very dodgy wouldnt run it in 4 wheel drive until you know what they did[/quote]

No I won't until I can get to the bottom of whats been done. I believe the previous owner spoke to you about diagnosis and rectification a while back. I guess we're not going to know whats been done until the box is stripped as I doubt Coast VW will have a record of what was done.
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Re: Why no bids ?

Postby 937carrera » 29 Jul 2019, 09:55

I'll let people like Aidan, Silverbullet and jebiga41 contribute on the details, but you can work out what gear ratio and diff are fitted without disassembly.

Take the plugs out, get the engine at TDC, chalkmark on bottom of the tyre, chalkmark on the floor, engage a gear and push the van forward for a distance, keeping note of how many complete engine revolutions take place. Then measure the distance moved and get a calculator out to determine the overall gear ratio.

Do it in 4th and 1st. As 1st gear sets are all 3.78, you can use that to determine the diff ratio. Once you know the diff ratio you can determine the 4th gear ratio. It'll be much harder to push the van in 1st. The longer the distance pushed, the more accurate the calculation, 2 or 3 van lengths should be enough.

Now all that will work fine for a 2WD gearbox, I'm not knowledgeable enough to know if the methodology will need adapting on a syncro, but others will
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Re: Why no bids ?

Postby Dobble » 29 Jul 2019, 10:02

Ah that's really helpful information. Thanks for that I'll give it a try and report back :ok
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Re: Why no bids ?

Postby Aidan » 29 Jul 2019, 10:13

Okay if you can get the vehicle safely jacked up (ie on axle stands) so one wheel on each axle is in the air and it is in neutral you can determine the final drive ratios of the front diff and of the gearbox, because you are can decouple you can do the front diff with it decoupled with just the front wheel in the air which is safer, but you need to couple for checking the rear box in order to rotate the prop flange so you need both axles with one wheel free to rotate

You mark the input flange of the front diff that attaches to the prop (output flange of the gearbox that attaches to the prop) and mark the wheel that is in the air and then rotate the flange counting accurately the number of revolutions required to turn the prop flange in order to rotate the wheel by one full rotation and then x2

So if it take just under 2.5 turns of the prop then it will be a 4.86 final drive. if it takes 2.7 turns it will be a 5.43, if it takes nearly 3 turns it will be 5.83 and if it takes just over 3 turns it will be 6.16

Hopefully what you find will match the codes stamped on the boxes and hopefully the front and rear ratios will be the same - if they are not the same then don't run it coupled as you will damage the VC

Chances are that if it was originally a 14" diesel van with say AHF code gearbox when it was rebuilt it ended up with a petrol 4th gear 0.85 ratio instead of the 0.78 that would have been in it (because 0.78s were unobtainable and good used ones pretty hard to find) and because the TDi may be a bit limited in rev range compared to the original TD engine that was in it originally or it may be the pump used isn't ideal for the engine so it is a bit fuel limited, so it doesn't have a great top speed, but it's a camper so speed doesn't really matter. Hopefully Coast will be forthcoming with the info about it, but judging by the fact that the final ad didn't mention Coast I wouldn't be surprised if they won't tell you much.

If you've goy any q's about the transmission you can drop me an email info@aidantalbot.com, and if you are in mid Wales camping then call in for a brew and chat
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Re: Why no bids ?

Postby Dobble » 29 Jul 2019, 11:23

You guys are awesome!! Thanks very much for the help I really appreciate it. I don't think I'd be keen on owning a Syncro without having the 8090 resource and joint knowledge of the members.

Aidan we might well take you up on that offer as we're looking to spend some time camping in wales.

I'll keep this thread updated with my findings. On a side note I got the van insured today and it only cost £140 to add it on to my policy and I've filled in the application form to join the Syncronauts (hopefully they'll have me)
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Re: Why no bids ?

Postby silverbullet » 29 Jul 2019, 13:54

Syncronauts is all of us here ;)
Beware of cheap imitations...

At Malvern (busfest.) there will usually be a good number of club80-90 syncronauts there, but the club doesn't endorse the event because of...reasons/history/characters etc

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Re: Why no bids ?

Postby Dobble » 29 Jul 2019, 14:33

silverbullet wrote:Syncronauts is all of us here ;)
Beware of cheap imitations...

At Malvern (busfest.) there will usually be a good number of club80-90 syncronauts there, but the club doesn't endorse the event because of...reasons/history/characters etc

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Ok cool, we're going to go to busfest. on the Saturday I think so will try and mingle and meet a few Syncronauts there. :ok
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Re: Why no bids ?

Postby Cobra88 » 29 Jul 2019, 18:09

you'll have to swap the rear lights over too :mrgreen:

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Re: Why no bids ?

Postby Dobble » 29 Jul 2019, 21:08

Cobra88 wrote:you'll have to swap the rear lights over too :mrgreen:

Rick


The thought had crossed our mind :D
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Re: Why no bids ?

Postby Dobble » 02 Aug 2019, 15:30

To follow up on the gear ratio conundrum I just got the van up on the ramp and followed Aidans instructions. It would seem that the diff ratios are both the same at 4.86. To double check this while both wheels were in the air I marked both tyres at the bottom and marked the ramp below each tyre mark then spun the rear wheel 10 times and checked to see if the marks lined up on the front wheel which they did.

Just for information the diff code is ADM and the gearbox code is AHF

This is good news as it means I can use the four wheel drive system but I think I will be looking to change the gearing at some point as at 60 its doing over 4000 rpm and I don't think I can go any bigger on the tyres as it got 215/70R16's already.
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Re: Why no bids ?

Postby Aidan » 02 Aug 2019, 17:00

Just for information the diff code is ADM and the gearbox code is AHF


so if they are 4.86 final drive then they have been modified as they should be 5.43 - so it's a 'cheap' way of doing a TDi box, upping the final drive, if it doesn't do 70 at 3200ish then they have changed the 4th gear from the original 0.78 (probably because it was stuffed, most of the TD 4ths are very tired and won't take a TDi), maybe there's a 0.82 out of a 5 speed maybe there's a 0.85 out of a petrol in there which would mean 60/61 at 3200rpmish which is where the TDi drops off on the power
the rev counter is probably incorrect, unless you are getting the rev info from scangauge ? 4000rpm in a TDi would sound awful
You can calibrate the standard dash rev counter to be a bit more accurate, it all depends on what set up is which alternator and pulley set up, but the rev counter is adjustable at the dash end
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Re: Why no bids ?

Postby davidoft1 » 02 Aug 2019, 17:04

My Westy California 1600TD IS 100kmph around 4000rpm, 120kmph at around 4500rpm, that’s where it likes to be
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