CS out 1yIn / gearbox ratio's CS to 1Y

[matt brighton]

Hi

Am now attempting to understand the world of gearbox/final drive ratios

The ratios from the donor car are
1st:3.308
2nd:1.913
3rd:1.26-
4th:0.975
5th:0.795
Rev:2.923
Final Drive:3.833

The ratios on the gearbox its being bolted to are...

1st - 3.78
2nd - 2.06
3rd - 1.26
4th .85

Diff 5.86 (?)

I have deduced that the lower the ratio thehigher the gear but related to the diff/final drive figuers with the bigger and more powerful engine will i be revvin me nuts off at 50mph. Appreciate its always a trade off between acceleration/ hill climbing ability v higher cruising speed.

I am on a steep learning curve with this transplant and probably wouldnt be doing it without the encouragement (thanks) and advice / replys to my earlier posts.

Figures obtained from skoda oc website and VW parts emporium.

Having driven the car back from london tonight it seems very healthy and surprisingly quick.

Wondering if the figures above can be translated by anyone here into what i might expect in terms of crusing /acceleration / top speed.


Thanks

Matt

[Aidan]

55mph top speed, off the line like a slightly scalded cat and through the gears quick
you'd be better off with an DK if yours is a 091 box, ie the Aircooled box with a diesel bellhousing/input shaft on it
what code is your box ?

[matt brighton]

Thanks Adain

Im surprised at just how much slower it will be in the van than in the car its being taken from - I was nudging an indicated 95 on way home (on a private road of course).

I guess the extra weight and lower gears account for that. However.... it pulls strongly uphill and im anticipating a noticable difference to the 1,6 which baulks at the slightest incline and has me downchanging thru the box quickly.

I will check what number box is in mine and post later.

Thanks for the advice and expect me to be in touch with you at your work to discuss whats involved in transplanting a dk box.

Is that a box you ususally have in stock and would I need to change the gearchange linkage rods (think mines the oldest type for 1.6D) that run to the front too ?



Thanks again

Matt

[camper]

Having done this conversion from 1.6td to 1Y engine you will need to change your gear linkage to aircool if you fit a DK code gearbox.(By the way this topic should be in the aternative & modified forum).Dont be to suprised with the performance compared to the doner car dont forget its pushing 2.5 tonnes.

[matt brighton]

Thanks Camper

I will have a search on tech

Regards

Matt

[weldore]

How long have you had to put up with the 1.6 matt?
Your right about the gears but the only diffence you will have with the 1y is more power to get through the gears faster

[matt brighton]

How long have you had to put up with the 1.6 matt?
Your right about the gears but the only diffence you will have with the 1y is more power to get through the gears faster

3 yrs .....and "enjoyed" it in a perverse kind of way.

Having no acceleration to speak of and so little power Its honed driving skills and a challenge to get every opunce of speed out of the poor little engine.

To its credit - its so cheap to run - simple to mmaintain - and has little to go wrong

theres alot to be said for that.

Looking forward to overtaking joggers and cyclists uphill after installling the 1y

The 2 owners I have spoken to who have done this rave about how much better it is as a result - just being able to maintain a reasonable speed uphill and get a reaction from the speedo when the pedal is pushed will be enough for me..

Thanks

matt

[austen smith]

We have just been through this syndrome. Mainly due to an engine failure and then subsequent gearbox failure. I hope that you put a new gearbox input bearing into the crankshaft. VW 1Y Golf engines don't have a bearing. You may have seen my soapbox campaign.
We changed the gearbox from an ABF gearbox for a 1.6 N/A diesel to a ABH gearbox for a 1.6 Turbo engine connected to our 1Y/1.9 lump. Not to overcome matching issues. But to just get the van running and useable.
Have to say that the gearing is much better and the van much more driveable, if you forget about trying to break the sound barrier.
1st gear is higher and not just a get it moving and change up quick. The prob is 3rd and 4th are awkward for some of the hills on the A35, here in Dorset. 4th too high and 3rd too low.
Apart from that, the van is lovely to drive to will cruise at 55mph with very little noise and hassle.
I do worry about putting a petrol engine gearbox on a diesel engine with all that torque. How long would you expect the box to last??????

[weldore]

some very good info there austin

the reason i asked about what you thought of running the van with the 1.6 was because i didnt want you to spend a lot of money on new gearbox's and replacing your engine only to be disapointed with the performance to cost ratio.its true that the 1y will vastly improve the torque when moving from the 1.6 but see what its like with your old box on..if you were happy to potter along at 50mph with the 1.6 then just the engine install will make it so much more enjoyable to drive.no one will be tailgating you as you move through the gears as before..its just the top end will rev the engine just as much as the 1.6 did.

if its alot more power and faster top end with lower revs then thats when the wallet has to come out

[Aidan]

there's no real difference between petrol and diesel gearboxes just different ratios to suit different engines, there's nowt stronger in a diesel box, in fact the 2.1 petrol boxes have the strongest differential, but they all have the same strength gears and crown and pinions - 3H TD box is exactly the same box inside as ABN 1.9 petrol box, only difference is the input shaft and bellhousing to suit the different motors. Basically the same gearbox was used on the SA vans with 2.6 litre 5 cylinder Audi engines in them and they have loads more torque than any TD lump
if your van is a watercooled gearbox 091/1 (single ball selector in the side of the box 1/3 of the way along as opposed to double ball selector on the side in the end case which is the 091) then just fit the ABD from a petrol 1.9, it's not perfect but pretty damm close, and not quite as long a fourth gear as the ABH which has the 0.78 gear and is designed for the Turbo engine

[austen smith]

Sorry to butt in with this thread. I am learning a lot here as well.
The reasoning behind my noseyness is that if we come across an ABD gearbox, even though its a petrol box it could be worth taking it as a spare should the need arise. Get you to re-work it, change over the diesel input shaft and bellhousing and we are away.
Changing the input shaft, now that is a black art to me. When we worked on the old box that came out, I could'nt get the shaft out for spares. Everyone says its easy. I'm not so sure?
Aiden, thanks for the info. Heard a lot about you.
Again sorry for poking my nose in.

[Aidan]

changing input shaft on a 2 pinion diff isn't too difficult, there's a bit of a knack to doing it right and I see a lot which haven't been fitted correctly;
on a four pinion diff or a syncro diff lock diff you really need to move the diff aside which means having some tools and marking things up and doing it right, most of the aap's I've seen modified to diesel have ben done badly or they just cut down the petrol input shaft insitu, often leaving the grinding dust in the oil seal or inside the box just to wear things nicely

[supergalaxy]

At the risk of stating the obvious you could just fit bigger rear wheels. There is plenty of info on other sections of this forum.

[kit]

Sorry to sound stupid but what difference would changing the wheels do?

[Plasticman]

dpendant on what wheels you have now ,if you fit tyres with a greater diameter it can make it seem like you have an extra bit of gear on a 4sp it would be like changing up to 4 1/2 bit like overdrive.
its helped on my derv
mm