Advice on engine gearbox upgrade for a 16"

[syncropaddy]

I have searched for a power/torque graph for a 1z and have come up with zilch! Now I am only guessing here from memory of a 1z Audi 80 I had some years ago, a diesel of that vintage should give its max torque at 2000rpm and the torque curve should be fairly flat after that up to 4000rpm. I have no idea on what effect a mechanical pump conversion would have to the torque band. Max power for a 1z is a 4000rpm.
For a JX TD engine VW give 2500RPM as the point of max torque but the 'sweet spot' is around 3000rpm where it ill sit all day. Judging from the graph I have, 3000rpm equates to 95% of max torque and about 80% of max power. So if I were to attempt with a 1z what you are doing, I would reckon on trying to get my desired cruising speed at around 2500rpm minimum

Syncrosimon says .....
'with the weight of my syncro I dont think the DJ could handle any higher gearing. If I stay above 65 she will go up any hill, and I can only get to 60 in 3rd, so momentum is everything'

This is a very valid point and you need to bear this in mind, momentum is everything and requires a certain amount of 'planning' as an underpowered, heavy and overgeared Syncro can be unpleasant. Reading other peoples experiences, a 3 ton Syncro is not unusual and interestingly, VW quote the maximum 'permissible GVW' for any Syncro is 2600kgs all in!

[toomanytoys]

Should have been in my 1.9 DG thats on 4.86 diffs...... (std 185 tyres) when I hauled the single cab up to Aidans (no engine and box or sides etc... they were all in with me...)

That was fun..... NOT.....
once on the flat and no head wind and rolling.. 60 wasnt a struggle, but incline/headwind.. 78 very tired old naggs though...

[bigblue16]

full aspect ratio tyres have a ratio of between 80 and 85%, I believe 185R14C equates to 83%, that's what Baxter put on his original tyre calculator and what I use on my gear ratio programme and it seems to be pretty accurate, probably with larger diameter rims and wider profiles it will be 80% or close to

Al, I need to get this gear calculator up on the web site as it can't easily be sent in a zip file by email as most mail servers seem to prevent zips and .exe files being transferred in order to prevent malware etc...

Aidan,
All you should need to do to send this gear calculater file is change the file extension - the EXE or ZIP part that falls at the end of the name - to an innocuous sounding one like OLD or NEW using the rename command, and then send them. You need to include a short instruction to users to rename it back before they try use or install it. This has worked well for me up til now.

Cheers, Scott

[Aidan]

cheers for that Scott, but I really want it on the website so peeps can play with it themselves, but I also want all the gearbox codes into the database and I'll include some good known upgraded boxes too, but that means a load of data checking and data entry when I get some time, just come in for a brew and to warm up, hasn't got above 3 degrees in th eworkshop today on the N side of the house, whilst the sun has been out lovely on the other side

[toomanytoys]

Aidan
You can send a load of info to me, I can do some checking and modifying.. make a change from all the sample data I am splitting and modifying and graphing at the mo................... Oh wait... no it wont.... but at least i'll actually be interested in it...

[v-lux]

can someone tell me where the specs for a 1z mTDi would go i.e. where does the green band start and finish, where is most effective cruise RPM etc?

Russel is (not suprisingly) right on the money when he said this earlier in the thread,

Ideal rev range for TDI at cruising speed [ 100 to 120 km/h] is 3000 to 3200 rpm. No more. You can go less {not much though} but this will depend on the weight of your van and drag on it { high top MT tires etc}

It certainly concurs with the driving experience of my van, around 3000rpm is where it seems most happy

[footstuck]

Hi
Will you be doing the work your self?

[bigblue16]

Hi
Will you be doing the work your self?

Hi Footstuck

No I won't be doing this myself - its far too important a job for that. One of the benefits of age and experience is that you learn when to quit and let your betters get on with their job. Better for me to work a bit extra and pay for an expert.

Having said that I have about 30 years "side of the road" work on Aircooled flat-4 VWs and everything I know I learned out of John Muirs " How to keep your Volkswagen alive - a guide for the Compleat Idiot" book, having started without knowing which end of a spanner was which. I actually overhauled the engine in my 1967 splitty Kombi back in the 80's using this book. The engine ran fine for 15 years before I sold it (stupid I know) but I think that is more a reflection of the brilliance of VW engineers rather than my particular skills.

Having said that I am still learning and I hope to extract a lot of info from these pages and the clever people that will be doing the work on my van. I just wish the diesels were as light as the flat-4s, my back is not what it used to be!

Cheers,
Scott

[syncropaddy]

I just wish the diesels were as light as the flat-4s, my back is not what it used to be!

I purchased an engine crane, heavy duty sack truck and a trolly for these very reasons

[bigblue16]

It looks like this thread has run its course and all that needed to be said has been said. I would like to thank all who participated for their generosity.

I really appreciate the education in the black arts of gear ratios, final drives and rolling radii and their effects on the cruising speed of the diesel equipped T3 camper. I would like to take this opportunity to close with a picture of my current ride, which is quite a bit different from the T3 or even the Landrovers and Toyotas I have bashed around the deserts of the world for the last 30+ years.

This little beauty is a 1970's Soviet era MTLB armoured personnel carrier. Weight +/- 12 ton, will cruise all day at 40-50 KPH and burns 15 litres of diesel per hour. And you can buy one for about US$10k I believe. Thats my driver and me (in the blue hard hat) Location Siberia, Ambient Temperature -30C

e-IMG_0099.jpg

[syncropaddy]

This little beauty is a 1970's Soviet era MTLB armoured personnel carrier. Weight +/- 12 ton, will cruise all day at 40-50 KPH and burns 15 litres of diesel per hour. And you can buy one for about US$10k I believe. Thats my driver and me (in the blue hard hat) Location Siberia, Ambient Temperature -30C

e-IMG_0099.jpg

Ah here!! You cant stop there ..... what are you doing in Siberia in an AOC?

[syncropaddy]

This little beauty is a 1970's Soviet era MTLB armoured personnel carrier. Weight +/- 12 ton, will cruise all day at 40-50 KPH and burns 15 litres of diesel per hour. And you can buy one for about US$10k I believe. Thats my driver and me (in the blue hard hat) Location Siberia, Ambient Temperature -30C

e-IMG_0099.jpg

Ah here!! You cant stop there ..... what are you doing in Siberia in an APC?

[bigblue16]

Hi Syncropaddy,

I am working as a oil company client representative on a Russian oil exploration crew. We live on the crew in the field to oversee their operations and to ensure the contractor fullfils contractual obligations regards data quality and safety. The data quality is not too burdensome, but safety is a bit of an unknown quantity here. Very interesting work generally though sometimes mightily frustrating especially if you don't speak Russian.

cheers, Scott

[v-lux]

That is one seriously cool piece of kit! Must be good fun, if not a bit noisy cruising about in that all day.

Interesting job! I'm always a teeny bit jealous of job that take people into environments such as the one you're in right now. Awesome!

[bigblue16]

That is one seriously cool piece of kit! Must be good fun, if not a bit noisy cruising about in that all day.

Noisy! NOISY-

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