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Home > 998cc > Megajolt or Turbo Dizzy,


275 Posts
Member #: 4600
Senior Member

Melton Mowbray,
near Leicester

I haven't bought either yet so I'm weighing up which will suit me best.

Budgets are running thin after just waving goodbye to my shell as it's headed to the bodyshop.

Do I really need Megajolt? would a turbo dizzy from a mg metro suffice? if I was to get the dizzy it means I could also spare some money to upgrade my cam to a mg metro cam. So either Megajolt or Mg metro turbo dizzy & Mg metro cam.

Basic specs are..

12g295 head.
Gen Challenge race carb.
T2 turbo.
TM Plenum.
Mirage Manifold.


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825 Posts
Member #: 9661
Post Whore

Sheffield South Yorkshire GB.

I have megajolt its brilliant worth every penny..Alan

Main Build

Upgrade to Turbo


275 Posts
Member #: 4600
Senior Member

Melton Mowbray,
near Leicester

But am I going to benefit hugely from it? I'm only running a timid 998cc! nothing serious!


733 Posts
Member #: 7912
Post Whore

Australia oi oi oi!

i would get the good cam first. use the dizzy

then save up for megajolt later..

and yes mega jolt all the way!! no cold start problems stays in tune no water issues, runs closer to a modern car.

you can properly tune your car for more power.


2926 Posts
Member #: 2500
Post Whore


As Nick says, you can always add the MJ later whereas changing a cam is a bit more laborious.

Rod S

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5780 Posts
Member #: 2024
Formally Retired

Rural Suffolk

As above but might be worth investing in the trigger wheel/bracket/sensor now as they will be a lot easier to fit with the engine out. Then save the expensive bit until later.

Schrödinger's cat - so which one am I ???


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824 Posts
Member #: 2065
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Why not do it right in the first place? A turbo dizzy will probably work. But it'll never be quite right. You'll benifit in all areas with megajolt. It'll start right, run right use less fuel etc

How long is it going to take you to put the car back together after being sprayed? Longer than it'll take you to save up for megajolt I recon!

You'll only regret not buying megajolt, plus you can get a bigger intercooler in without a dizzy - and that means more boost!!!

On 7th Nov, 2011 apbellamy said:
Shaft seems nice and snug

On 24th Mar, 2012 apbellamy said:
no no no no, you need more boost! you can never ever come on here and say I have enough boost, that's just silly.

On 29th Mar, 2010 Star Mag said:
these give no problems with good head


275 Posts
Member #: 4600
Senior Member

Melton Mowbray,
near Leicester

It'll only take a month or two to reassble it all (as if, things will go wrong and it'll take longer)

The main factor is that I'm at uni and my funds are limited and running dry!

I think for now instead of buying Mj I will use that money to buy a new cam & a turbo dizzy. As long as it runs and runs smoothly I'm happy! If I had all the money I'd happily splash out on it all!


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9161 Posts
Member #: 123
Post Whore

Betwix Harrogate and York

The MJ will make a massve differance. I wouldn't even entertain a dizzy now.

It will work and it will be safe though, but unless you have one or can borrow one I wouldn't spend money on one.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

On 2nd Jan, 2013 fastcarl said:

the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


275 Posts
Member #: 4600
Senior Member

Melton Mowbray,
near Leicester

Reason I asked was after seeing this build:

His specs:

standard 998 block, pistons and gear box.
1275 cam to give a little more exhaust lift.
Standard 998 head ported and then opened out to give a few more cc's
Renault 5 water cooled T2 turbo with 8psi of boost
Intercooler (not sure what from)
Metro turbo manifold and bits
Metro turbo dizzy
Converted maestro carb
Playmini exhaust


And he got good results on the rollers!

Ben H

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3329 Posts
Member #: 184
Senior Member

Melton Mowbray, Pie Country

Yep, flat out there is not much advantage having MJ. It is every other throttle opening that it becomes better. i.e 90%+ of the time driving. The MJ allows you to max out the advance when on light boost or no boost, improving MPG and drivability.

A man without a project is like a like a woman without a shopping list.


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1492 Posts
Member #: 9468
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Wootton Bassett

I have a mk1 metro turbo ignition setup if your intereseted, bought it but never used it because I havent got the engine back together - new cap and rotor srm included, silicon leads and brand new spark plugs will send piccies if your interested

On 10th Mar, 2012 theoneeyedlizard said:

Hypothetically speaking, where would you stick your nozzle?

On 22nd Jun, 2012 apbellamy said:
my wife doesn't know what.head is never mind compression ratio.

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