Z3M V8 Conversion

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Re: Z3M V8 Conversion

Postby Dino D » Fri 30 Jan, 2015 17:31

Looks great! Even lower and wider.
Seems strangely unfinished without them.
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Re: Z3M V8 Conversion

Postby c_w » Sat 31 Jan, 2015 21:19

Deano1712 wrote:Hamann diffusers fitted today. I love 'em :D
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I'm not normally keen on these but I think they really suit it - I think it's the big wide tyres make it work, but would look a bit "over dressed" on a car with normal width 245/255 rear tyres.
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Re: Z3M V8 Conversion

Postby Gazza » Sun 01 Feb, 2015 15:57

Deano1712 wrote:Hamann diffusers fitted today. I love 'em :D
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I have a set of those in the garage, must get around to fitting them this year.
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Re: Z3M V8 Conversion

Postby bertiejaffa » Wed 11 Feb, 2015 02:55

Dino D wrote:Have to make a plan to see and hear this car in action one day. Just awesome'


You have to come and see it... Under the bonnet is like looking into a JJ Abrams film but actually following it is immense....

From behind (default viewing option) it sounds amazing and leaves you like £10s in a strip club... Most impressive is how Mark keeps it under control... Ive seen it kick and scream like you have never seen but then when tamed it is like watching an F1 car
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Z3M V8 Conversion

Postby Deano1712 » Sat 02 Jan, 2016 20:16

Happy new year everyone [emoji3]

A few of you will know the car has had a small coolant leak for a while, getting worse in 2015. On Pingu's run last year it got me worried and I didn't drive the car much after for fear of coolant loss and overheating. The leak was coming out of the bottom of the bellhousing between the engine and gearbox. This made little sense unless there was a leak out of the back of the engine; eg core plug. I couldn't see a leak anywhere so the plan this winter period was to pull the engine out to find the damn leak.

So here is the culprit. A small hose ABOVE the engine at the rear. The hose has a small nick through the inner layer and the leak was coming through the end of the hose through the reinforcement fibres.

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The leak was dropping onto the top of the bellhousing and entering through an aperture passing through and out of the bottom!

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What a pain in the neck, two full days work getting the engine out. The hose must have been damaged when the conversion was done. The car has always used a little bit of coolant. The hoses at the back of the engine are impossible to access and see so now I have added new hoses running them across the back of the bay with no joints. There is just the one connection to the heater inlet on the firewall. I need to make a new coolant reservoir too.

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Now the engine is out there are a few jobs to do and I'm tempted to make a few upgrades [emoji3]

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Z3M with a few mods...and a little bit more power
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Re: Z3M V8 Conversion

Postby Lewy » Sun 03 Jan, 2016 12:56

Wow! I've just read from the very start and what an interesting project.

I've been flirting with a V8 conversion for years although I haven't got the skills to pull this off myself.

Clearly it's not all plain sailing but it must be a fantastic feeling burbling down the road knowing you built this all yourself.

Loving the work on your garage too :)



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Re: Z3M V8 Conversion

Postby Deano1712 » Mon 03 Apr, 2017 21:00

Hi all, I have been rubbish at keeping this up to date and generally posting on the forum. Must try harder :oops:

I got the car running again early in 2016 after making a new coolant header tank and simplifying the coolant hoses. That worked great for curing the leak at the bulkhead. The tank looks a bit neater too, here is a pic of the engine bay...
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In May 2016 a few of us did DTEC event (drive through every county) and it was a bril week. The car ran great over ~3000 miles with no problems at all. Averaged over 20 mpg too! Here are a few pictures.
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One problem I have been having every since fitting the v8 is with the starter motor. I am on motor number 3 now and think the problem may well have been with wiring rather than the starter motors failing, but its not possible to be sure. I now have a remote start solenoid and its staring great for now, fingers crossed this will continue. Its normal to wire the remote solenoid to parallel both the pos feed and trigger to the starter. I tried that but had a problem with starter over-run and now just use the solenoid to power the solenoid on the starter, with a perm 12v to the starter as normal. The only advantage is I'm running a big thick cable to the starter solenoid so there will be very little volt drop. I think with a small gauge cable the voltage can be too low to energise the starter, especially when it gets hot down there. The starter motor is located between the engine block and drivers side manifold.
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Fun day yesterday getting the car out of winter storage. I'm keeping the hardtop on for a few weeks to get some value out of the £2.5k cost lol. The daily driver is now a 335d and that's a fast car, but OMG the z3m is in a different league 8-)
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Re: Z3M V8 Conversion

Postby deni2s » Tue 04 Apr, 2017 22:05

Love your strut bar. Could it be fitted the same way to the middle with stock engine? If yes, would you consider making another one?
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Re: Z3M V8 Conversion

Postby Deano1712 » Wed 05 Apr, 2017 17:02

My car has a welded on bracket on the bulkhead to attach the brace to. To do this on a z3 you will need engine out to do same. So its not easy at all.
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Re: Z3M V8 Conversion

Postby Jonttt » Sun 09 Apr, 2017 23:26

Looking good Deano 8-)
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Re: Z3M V8 Conversion

Postby Martini » Thu 11 May, 2017 10:29

I smile every time I see a picture of the back end of that car :D
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Re: Z3M V8 Conversion

Postby bertiejaffa » Wed 17 May, 2017 10:24

Its a bit slow.... need those turbos fitting...... :twisted: :twisted:
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