998 turbo - 600 quid - 90ish Bananas
Turbo Mini Forums

Here is the kind of post I mentionned in
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=333083

The target is to detail all the required stuff for the engine mentionned above.

It will be edited as comments come by.



Fuel :
SPi tank including pump - 50€
SPi sender unit (missing on the tank) 40£
Hif 44 N/A - free
Hif 44 turbo rebuild kit 45£
http://www.minispares.com/Product.aspx?ty=...0FOR%20HIF%20...
BDD Needle 6£
http://www.minispares.com/Product.aspx?ty=...BO%20SWINGING...
12oz spring - 5£
http://www.minispares.com/Product.aspx?ty=...20GREEN%2012o...
Metro turbo inlet and plenum - 40€
=> Metro turbo inlet + N/A carb = trimming of the cables required
Fuel pressure regulator - 10€


Head :
12G295 untouched complete with valves and springs - 100€
New inlets valves OS - 44£
New 998 27 mm inlets as exhausts - 24£
Surfacing and machining of the bigger exhaust seat - ?
Modded combustion chambers à la Vizard - free
Modded exhaust ports - free
New bronze guides - 25£
http://www.minispares.com/Product.aspx?ty=...T(8)%20MANGON...

300€ maybe


Block :
Standart A+
Standart flat top pistons - said OK up to 10 psi
Standart cam
MS block to turbo pipe - 53£
http://www.minispares.com/Product.aspx?ty=...CK%20OIL%20PIPE

Dizzy :
Megajolt kit - 70€
EDIS off an Escort - 30€
Coil pack off a Fiesta - free
TDC sensor off a Clio - free
TDC pulley off a racing Megane with a diesel engine in - free

Air :
Intercooler off a new Kangoo - free
Random Renault pipes - free
Cone shape air filter - ?

Exhaust :
SPi exhaust (for the O2 sensor) - 8€
Custom pipe from SPi exhaust to clutch mounted turbo - Probably free at work
GT15 off a diesel 1,5liter engine - free
T2 as a replacement if diesel turbo fails - needs rebuilding, was seized up ?
Custom downpipe - Probably free at work

Gearbox :
Everything standart but I have a X pin diff for the stage 2 rebuild


All in all 700€ but I got lots of parts from work
And it is not done yet so 90 to 100 bananas is an estimation from knowledgeable people on this site.

Edited by Advantage on 31st Dec, 2009.

Rusty by nature

Sounds good to me. You get a BDD needle in the carb re-build kits so that'll save £6!

The other problem you might have is that the throttle connections on the N/A carb foul the turbo inlet. The MG inlet or other alloy ones will make fitment easier.

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

www.twin-turbo.co.uk

If something is worth doing, it's worth doing half of.

You should have done.

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

www.twin-turbo.co.uk

On the minispares link I put, there is no needle.
There is the jet thought ..

Rusty by nature

I know this is a really old thread, but would you be better off using a 1275 head and pocketing the block rather than a 12G295? Seeing as there are getting quite rare so more expensive.

Also instead of using a spi tank could you just get an electronic fuel pump? That would work out cheaper if you already had a tank.

You would have to have the chambers on the 1275 head opened out, so if your not doing it yourself then by the time youve paid for the head mod and the block machining it would prob be cheaper to get a standard 295 head and bolt it straight on.

one day boost will be mine!

Heads :

4 options :

12G940
12G295
12G202
Standart 998 head

Standart 998 is crap, see Alpa's thread below
(need to edit link)

12G295 are sought after in standart form as the chamber volume will give a little over 9/1 on 998 flat top pistons.
Thickness need to be checked, it should be 76 mm otherwise it has been skimmed and chamber volume is down.
Edit : 12G295 is 2 3/4" or 69.85mm

12G940 could need pocketing of the block depending on valve lift.
With 998 flat top pistons, CR is too high for turbo application, either switch to dished pistons or enlarge head or both.

12G202 is basically a bigger valve version of standart 998.
It's main advantages are it's very cheap and availability is better than the 12G295.
Chambers will do with some enlarging à la Vizard.

When modding a head, never assume chamber volume, measure it !

On every head you plan modding, start grinding in the area between the valves to search for cracks.

Edited by Advantage on 13th Oct, 2011.

Rusty by nature

The 12G295 is 2 3/4" or 69.85mm before skimming.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Where are you getting a megajolt for £70?

http://www.turbominis.co.uk/forums/index.p...tid=469104&fr=0

2009!?

In case it's of use to anyone else, if you're using the standard A+ head (CAM4810) the BDD needle mentioned in the original post is too rich on boost/under load and I've found it too lean on light throttle.

The BDL needle seems to be a very good starting point. A little lean still on light throttle but almost perfect under load maybe just a touch rich.

Once I get mine on the rolling road, I'll update the thread with what's found.