GolfGTIforum.co.uk
Model specific boards => Golf mk3 => Topic started by: AdamBeevers on 08 February 2011, 17:24
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just a random question. has anyone tried fitting any different ratio gearboxes to the 2.0 16v gti? just want something that pulls away a bit quicker, but i dont want it to blow up after a few months. cheers. James
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*Cue Ess_Three's full on 16v info overload* :wink:
I know you can make a big difference by changing the final drive ratios and sticking a lightened and balanced flywheel on.
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3.9 final drive. Means a strip down. Lightened flywheel by hotgolf on cgti. All info on there.
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I'm sure there are some 02A boxes with different final drives in already (but could be wrong)
I'll have a look and see if I've still got the info.
Paul
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Id really like to hear what boxes do have a better set of ratios (if they do?) for a simple swap over (i doubt it though)
If it's a case of whipping the box open, which donor box is needed and what sort of costs should be expected for parts and labour etc?
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After looking back for the info it seems that some of the 02A passat boxes had a higher (or is it lower) final drive in them but a different set of ratios. So a straight swop won't give you the desired effect.
Changing the final drive will increase your pulling away speed in first, and lower your overall speed in each gear. It will also lower the mph gap between each gear. In theory then for the same speed in the same gear you will be higher up the rev range with a higher final drive.
You can achieve similar results by going to lower profile tyres. If you are running 195 /50/ 15's then you could try running 195 / 45 /15's.
Don't shoot me if I've got the higher or lower the wrong way round on the final drive. A standard 02A Mk3 16v box has a final drive of 3.64 ish and you want to swop to a 3.9 ish one or go all the way and swop to a 4.24 ish one.
The 16v box has a very long third gear. If you were going the whole hog then you really need to change the final drive and some of the gear ratios.
I believe Glen (Ess Three) has done this.
Paul
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Look through this (http://www.clubgti.com/forum/showpost.php?p=1858387&postcount=12) Find the ratios you like and find what car has the gearbox code.
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The list is a bit misleading because some (or a lot) of those 02A gearbox codes are not from Mk3's. The EBQ gearbox looks to have the same ratios but a better final drive but it is from a Mk4 Golf and Beetle so its not a direct swop.
Paul
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It's not misleading. 02A's don't need to be from mk3s to fit. As long as it's a 4cyl it will fit.
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Sooooo....in basic form what code box would suit the ABF better than the standard one and be a straight swap over as all those ratios blow my brain?
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It's not misleading. 02A's don't need to be from mk3s to fit. As long as it's a 4cyl it will fit.
You can make them fit but they aren't a straight swop. If you use one from a Mk4 you will need to change either the shift tower or the cables. I believe you may will also need to change the drive shaft flanges depending on what gearbox you get. There is also some modification required to the shift cable bracketry dependent on which set up you use.
Paul
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It's not misleading. 02A's don't need to be from mk3s to fit. As long as it's a 4cyl it will fit.
You can make them fit but they aren't a straight swop. If you use one from a Mk4 you will need to change either the shift tower or the cables. I believe you may will also need to change the drive shaft flanges depending on what gearbox you get. There is also some modification required to the shift cable bracketry dependent on which set up you use.
Paul
Mk4's have 02j's not 02A's. Drive shafts may be an issue. But can be got around easily.
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Mk4's have 02j's not 02A's. Drive shafts may be an issue. But can be got around easily.
02A/02J basically the same...drive flanges differ, as covered by Paul above.
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16v O2A has a reasonably decent set of ratios...its the FD that's too high.
Passat 'box has the 3.94 FD...but bad ratios, giving similar overall results...CCM 'box maybe?
A good solution is the 3.94 FD into the DPA/CDA 16v 'box...
Or a 4.2 if you feel brave.
I've had both.
Preferably with a Quaife/Peloquin diff...and a light flywheel.
For road use, and a daily driver...a 3.94 FD (std is 3.67) is great...
For a weekend toy...a 4.2 is superb...but you really need work to the ABF to give more power up top to make best use of it.
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Is it difficult changing the FD?
When my clutch goes (touch wood not any time soon) I want to crack the box open and service it. Whilst it's open I'd like to stick a 3.94 FD, lighter flywheel and MAYBE, IF money allows a nice diff. If not then buy a bolt kit for the diff and get rid of the nasty rivets.
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Is it difficult changing the FD?
Yes, in so much that you have the strip the 'box to get the diff out...new bearings in, and shim the diff.
When my clutch goes (touch wood not any time soon) I want to crack the box open and service it. Whilst it's open I'd like to stick a 3.94 FD, lighter flywheel and MAYBE, IF money allows a nice diff. If not then buy a bolt kit for the diff and get rid of the nasty rivets.
Good choice...
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What is shimming the diff?
Well seeing as I plan on opening it to bolt the diff up and change any seals then I guess the FD will be along the way :smiley:
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What is shimming the diff?
You need to dummy build it, measure the play in the diff bearings, and order the correct shims from VW to give the correct play....as I recall...as my mate built mine and he works for VW, so getting shims was easy.
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My current 02A box seems to have been played with. It is from a Corrado 16v, but it tops out earlier than expected. I'm guessing a shorter final drive :undecided:
Got a G60 and a TDI box to try out, so the TDI will be going in soon, will suit me much better as 1st and 2nd are way too short. As said earlier 3rd is nice and its only then you can really pull.
Oh and my car is a daily drive, so would be nicer onto a day to day basis too and lower revs when cruising up the motorway.