3.0 Z3 (2002) as a Donor car (shocking I hear you say !!)

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Law'
Joined: Tue 04 Oct, 2016 17:41
Posts: 5

  Z3 roadster 3.0i

3.0 Z3 (2002) as a Donor car (shocking I hear you say !!)

Post by Law' » Tue 04 Oct, 2016 20:39

Hello, new member alert !!!!!!!!

I've bought a 2002 Z3 3 Litre to use as the base/donor for my 2Fifty kit car.

Here's my challenge, if I use the standard 3.0 rear axle set up then I can't fit the right rear classic wire wheels to get my kit car to look right. Rumour has it that I could source the half shafts & trailing arms from a pre Facelift 1.9 Z3 (pre 2000 me thinks?), this should give me an extra 35mm each side to play with in terms of rim offset.

My concern is that the 1.9 half shafts (drive shafts) splines / diameter marry up with the 3.0 Z3 Diff ???

All help advise is welcomed & appreciated - Thx

mrscalex
Joined: Fri 13 Mar, 2015 09:14
Posts: 795

  Z3 roadster 1.9

Re: 3.0 Z3 (2002) as a Donor car (shocking I hear you say !!

Post by mrscalex » Tue 04 Oct, 2016 21:23

If I was building a kit car based on a Z3 I think I would want the best model which wasn't an M.

Plus if there weren't people like yourself those of us who restore wouldn't have access to such nice panel sets from the initial strip down.

What colour is it by the way and will you be selling the panel set?

I'm breaking a pre-facelift 1.9 currently. I won't have time to take the half-shafts/trailing arms off myself but if you want to come down and do it yourself you can take them on sale or return depending on whether they fit. We might even be able to do a swap depending on the position with your panels.
ImageImage
1999 Z3 1.9 Boston Green (Dimitri) - My brother's car owned from new and restored by me
2001 Z3 2.2 Topaz Blue (Trudy) - My car rebuilt from a write-off
2002 Z3 2.2 Titan Silver (Okus) - Project car waiting for a new engine
2001 Z3 2.2 Topaz Blue (Debra) - Donor car/breaker
1998 Z3 1.9 Boston Green (Allsworth) - Donor car/breaker now gone to Z3 heaven
Always happy to try and help with spares :)

Law'
Joined: Tue 04 Oct, 2016 17:41
Posts: 5

  Z3 roadster 3.0i

Re: 3.0 Z3 (2002) as a Donor car (shocking I hear you say !!

Post by Law' » Tue 04 Oct, 2016 21:34

Thx for the reply mrscalex.

My 3.0 is a metallic black finish and yes your right I won't be needing the bonnet, bumpers / beams, boot or any of the lights.

What in your opinion is the best Z3 then ?

mrscalex
Joined: Fri 13 Mar, 2015 09:14
Posts: 795

  Z3 roadster 1.9

Re: 3.0 Z3 (2002) as a Donor car (shocking I hear you say !!

Post by mrscalex » Tue 04 Oct, 2016 21:38

No I meant I would want the best model and agree that's a 3.0 too.

However I'm an as it left the factory freak so doing a kit car wouldn't be my thing.

I bought a complete panel set for my project off the guy who does the Ferrari 250 conversions in Reading. Great source of panels because someone spending £10k+ on a kit car build wants a nice car to start with.

I'm afraid black panels aren't (currently) any use to me (Titan Silver or Topaz Blue would be). But let me know if I can help the 1.9 parts.
ImageImage
1999 Z3 1.9 Boston Green (Dimitri) - My brother's car owned from new and restored by me
2001 Z3 2.2 Topaz Blue (Trudy) - My car rebuilt from a write-off
2002 Z3 2.2 Titan Silver (Okus) - Project car waiting for a new engine
2001 Z3 2.2 Topaz Blue (Debra) - Donor car/breaker
1998 Z3 1.9 Boston Green (Allsworth) - Donor car/breaker now gone to Z3 heaven
Always happy to try and help with spares :)

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Southernboy
Joined: Thu 07 Oct, 2010 13:39
Posts: 6312

  Z3 roadster 3.0i
Location: Johannesburg

Re: 3.0 Z3 (2002) as a Donor car (shocking I hear you say !!

Post by Southernboy » Wed 05 Oct, 2016 06:20

The diff on the 1.9 is different to the diff on the 3.0. But the rear drive shafts do not enter into the diff.... the diff has an output flange left and right, to which the rear drive shafts are bolted... so if the 1.9 drive shafts match up to the 3.0 diff flanges you can just go ahead, alternately, have the 1.9 shaft flanges drilled with 4 new holes to match the 3.0 diff output flange. The new holes can be positioned between the OEM 1.9 holes.
"Normal is overrated"
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Law'
Joined: Tue 04 Oct, 2016 17:41
Posts: 5

  Z3 roadster 3.0i

Re: 3.0 Z3 (2002) as a Donor car (shocking I hear you say !!

Post by Law' » Wed 05 Oct, 2016 11:30

Thank you, you have confirmed my thoughts regarding the Z3 3.0 diff marrying up to the 1.9 drive shafts - I'm hoping that I can simply unbolt the 3.0 mounting plates/flanges off the diff' and switch it out fitting the 1.9 donor ones, then fit the 1.9 drive shafts onto my car's 3.0 std fit Diff.

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Southernboy
Joined: Thu 07 Oct, 2010 13:39
Posts: 6312

  Z3 roadster 3.0i
Location: Johannesburg

Re: 3.0 Z3 (2002) as a Donor car (shocking I hear you say !!

Post by Southernboy » Wed 05 Oct, 2016 11:53

It would be simpler to first check the hole match of the 1.9 shaft flange with the 3.0 diff flange... it'll be easier to have new holes drilled. The 1.9 diff flanges won't fit into the 3.0 diff - it's a completely different diff. The 1.9 diff is much smaller than the 3.0 diff as a complete lump. Also, the 3.0 diff is an LSD diff, whereas the 1.9 may not be.
"Normal is overrated"
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Z3 Upgrades and Additions

Law'
Joined: Tue 04 Oct, 2016 17:41
Posts: 5

  Z3 roadster 3.0i

Re: 3.0 Z3 (2002) as a Donor car (shocking I hear you say !!

Post by Law' » Wed 05 Oct, 2016 12:25

Here's where my head is at the mo' regarding this:

As they're cheap my plan is to buy a 'spares or repairs' 1.9 Z3 and get it home next to my 3.0, from here I can see what will bolt on and what will/may need modifying.

From what everyone's said it's a possible conversion but the 1.9 half shafts may struggle under load from the 3.0 lump, and that the 3.0 Diff mounting flanges are going to be different to the 1.9 drive shaft mounting flange plate?

What do you think of my plan, mad or sane ? :?:

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Southernboy
Joined: Thu 07 Oct, 2010 13:39
Posts: 6312

  Z3 roadster 3.0i
Location: Johannesburg

Re: 3.0 Z3 (2002) as a Donor car (shocking I hear you say !!

Post by Southernboy » Wed 05 Oct, 2016 12:36

It's your project, and you should do it the way you want to... No doubt you'll have some spares from both vehicles which can be used to offset some costs... Just enjoy yourself and don't hassle about anyone's approval or lack there-of.. :wave
"Normal is overrated"
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spurs fan in a coupe
Joined: Fri 18 Apr, 2008 20:24
Posts: 1435

  Z3 coupe 2.8
Location: woking

Re: 3.0 Z3 (2002) as a Donor car (shocking I hear you say !!

Post by spurs fan in a coupe » Wed 05 Oct, 2016 20:07

Where you based mate? There's a few people who specifically break Z3s and may be able to help you out.
we expres: " He did hear the bells ringing, but doesnt know where where the clapper hangs".

Julie Z3
Joined: Mon 22 Nov, 2010 09:47
Posts: 216

  Z3 roadster 2.8
Location: Bristol

Re: 3.0 Z3 (2002) as a Donor car (shocking I hear you say !!

Post by Julie Z3 » Wed 05 Oct, 2016 20:36

Hi Law
Welcome to the forum, just had a quick google , looks like a nice kit, reminds me of an MG from the rear? Looking at the car on youtube as well as the bonnet it looks like you won't need the original small wing panels that the side indicators are located? If you are looking to sell would be very interested if they are in good shape , also looking for a good pair of outer lower sills (left/right) again if your looking to offload the surplus panels .

handsomejackuk
Joined: Sat 18 Jun, 2016 11:35
Posts: 295

  Z3 roadster 1.9
Location: Blaenau Gwent South Wales...

Re: 3.0 Z3 (2002) as a Donor car (shocking I hear you say !!

Post by handsomejackuk » Wed 05 Oct, 2016 21:52

i would be interested in the facelift front headlights too if they become available please pm me

thanks Al...

Law'
Joined: Tue 04 Oct, 2016 17:41
Posts: 5

  Z3 roadster 3.0i

Re: 3.0 Z3 (2002) as a Donor car (shocking I hear you say !!

Post by Law' » Wed 05 Oct, 2016 23:45

To all that have expressed an interest. I will be selling (listing on here & eBay) all the parts I don't need for the build - Bonnet, bumpers, beams, sills, boot, lights, chrome side grills etc etc

roger_thelwell
Joined: Mon 25 Jul, 2016 23:52
Posts: 1

  blank

Re: 3.0 Z3 (2002) as a Donor car (shocking I hear you say !!

Post by roger_thelwell » Mon 07 Nov, 2016 12:07

Did you manage to find a simple'ish solution to your wire wheel problem, as I am looking for a set for my 1999 facelift 2.8.

I guess by the sounds of it your not looking for bolt-ons, of which I can't seem to find either (unless you want them in 17" * 8", which would be just too big).

Thanks,
Roger

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pingu
Joined: Fri 30 Apr, 2004 17:01
Posts: 3337

  M roadster S50

Re: 3.0 Z3 (2002) as a Donor car (shocking I hear you say !!

Post by pingu » Mon 07 Nov, 2016 12:32

I'd be very surprised if the driveshafts would be too weak to handle the torque.

If you use a 1.9 diff, that could be too weak, but finding out is part of the fun :D .

These torques are engine torques, you will have to calculate worst case scenarios using g/box and diff ratios...
1.9 torque = 180Nm
3.0 torque = 300Nm

[edit]
:shock: It look a bit more complicated. I would check RealOEM. A quick look showed this. If I were you, I would use specific chassis number to do the check, and not generic details as I did...
1.9 LK=80mm Dia=26mm
3.0 LK=110mm Dia=38mm
M LK=94mm Dia=27mm
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Pingu

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Gazza
Site Admin
Joined: Tue 04 Oct, 2005 21:58
Posts: 9186

  M roadster S54
Location: East London/Essex

Re: 3.0 Z3 (2002) as a Donor car (shocking I hear you say !!

Post by Gazza » Mon 07 Nov, 2016 22:35

Just noticed a guy has posted several pics on the Z3 owners page on facbook
Gazza

"Understeer is when you hit the wall with the front of the car, oversteer is when you hit the wall with the rear of the car. Horsepower is how fast you hit the wall and torque is how far you take the wall with you"

S54 M roadster Image Mustang Fastback, BMW Z1, BMW M3 CSL.

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