998 - T2 and lots of budget help for newbie?
Turbo Mini Forums

Hey guys

Try not to beast me too much as I have spent many longs hours reading past posts before coming on here to ask these questions.

My aim is a cheap and cheerfull 998 turbo with T2 and 6-7 psi 70bhp?

1, Mirage manifolds look the way to go for me as I dont wish to chop the bulkhead due to tightening IVA laws on mods, BUT is there a more cost efective way without chopping the bulkhead?

2, Timing, I have read topics on welding dizzy's "locking" etc but will a MG Metro Turbo dizzy fit/work with my engine without the need for further mods?
Yup I'm just too cheap/broke for a mega jolt/squirt etc

3, I plan to have a crack at dropping my comp down by removing metal from the head (standard 998 unleaded head) should I be shot for this? I'm not looking for massive power.

What cc will I need the head chambers to be?

I have read up about the 12g295 on here but I have loads of standard 998 heads to play with and short arms, but deep pockets.

4, everything will be standard with the engine bar the modded head and turbo fitment, will 70bhp be an achievable target and a reliable one?

I realise I could just drop in a 1275 etc or even get those horsies from a 1000 with nice add on bits but I wish to teach myself the cogs and gears parts of minis and start with something basic and then over time learn more.

Many thanks

Edited by garrett3 on 7th Jan, 2010.

On 7th Jan, 2010 garrett3 said:
Hey guys

Try not to beast me too much as I have spent many longs hours reading past posts before coming on here to ask these questions.



big hug

My aim is a cheap and cheerfull 998 turbo with T2 and 6-7 psi 70bhp?

at least

1, Mirage manifolds look the way to go for me as I dont wish to chop the bulkhead due to tightening IVA laws on mods, BUT is there a more cost efective way without chopping the bulkhead?


make your own ? search pauls manifold.

2, Timing, I have read topics on welding dizzy's "locking" etc but will a MG Metro Turbo dizzy fit/work with my engine without the need for further mods?
Yup I'm just too cheap/broke for a mega jolt/squirt etc


cheapest workable thing is to fix the dizzy at 24 degrees (measured with no vac ).roughly ..,leave the vacuum advance on .


3, I plan to have a crack at dropping my comp down by removing metal from the head (standard 998 unleaded head) should I be shot for this? I'm not looking for massive power.


no thats fine

What cc will I need the head chambers to be?


youll have to measure the volume of the head and piston dishes .,and then work it out.

I have read up about the 12g295 on here but I have loads of standard 998 heads to play with and short arms, but deep pockets.

hope you have a girlfreind !


4, everything will be standard with the engine bar the modded head and turbo fitment, will 70bhp be an achievable target and a reliable one?


oh yes .

I realise I could just drop in a 1275 etc or even get those horsies from a 1000 with nice add on bits but I wish to teach myself the cogs and gears parts of minis and start with something basic and then over time learn more.


good thinking.


Many thanks

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

All sounds good to me. You need around 28cc in the chamber to get a little over 9:1 CR. Not sure this is possible on a standard head.

You could put a slight dish in the pistons if you can't.

Not much option with manifolds really, if you can make one it might be cheaper.

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

www.twin-turbo.co.uk

Thanks robert

Kill me for being stupid but why leave the vac advance on if the dizzy is welded in position?

I did search the above but found lots of posts where some guy was repeating himself and kept starting the same topic over and over??

Can someone explain the logic behind this in simple terms? the workings and weights etc and why the vac advance needs to stay on?
How will I set at 28 degrees?

I'm a body work man as you have probably guessed lol


Yeah I have a wife and I'm hoping she wont mind me doing this in the kitchen

As for making my own manifolds I would rather help someone with some cash to do it for me, I really do like the mirage set up but at £350 its pulling away from the budget build I had in mind.

I allready have the turbo carb and inlet manifold. £Free
T2 turbo complete £95
Lots of 998 engie parts £free

I will search pauls manifold and see what I can find...

Will_h thanks for the reply

You say 28cc may not be possible in a standard head? has anyone tried to mod a standard head for this application before?

I will post up my results when I try

What is the standard head cc and comp of the engine as standard?

Sorry for so many questions

Edited by matty on 31st Jan, 2010.

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1/4mile in 13.2sec @ 111 terminal on 15psi

On 7th Jan, 2010 garrett3 said:
Hey guys

I wish to teach myself the cogs and gears parts of minis and start with something basic and then over time learn more.

Many thanks

Rusty by nature

Thanks Guys, I'm off to find a vizards book


EDIT: this one? http://cgi.ebay.co.uk/Tuning-the-A-Series-...=item5ad5dda355

Edited by garrett3 on 7th Jan, 2010.

Thats the one.

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1/4mile in 13.2sec @ 111 terminal on 15psi

The standard 998 heads are rubbish even when worked. Make a manifold, as suggested above & spend the money you've saved on sourcing a decent 295 casting.

WWW.TURBO-MINI.COM

Hey Phil

thanks for the info

Thanks

Edited by garrett3 on 7th Jan, 2010.

phil , look at his bhp requirement , a stock head should do that no probs ?

on the distributor , you fix the advance mechanism in the distributor so it cant move , then run a vacuum advance that can still pull the back plate round ,this gives advance at cruise and roughly 4 more mpg .

really agree with matty , make your own ,the mirage one is v simple .

build it with a stock opened out head ,and see how it goes ? then strive to find a 295 if your not happy ?

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Doh ! Thanks Robert. I see you're only looking for 70hp, so yes the stock head will probably do then. Though if you can afford it, fitting a 295 will be the next big step in the tuning ladder.

WWW.TURBO-MINI.COM

For now I am just learning and having a play.

Later on I will go for a fire breather but for now 70ish bhp from a 998 should keep me happy and teach me the basics.

all good fun

Thanks for the replies