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Home > Introduce Yourself > Hello, looking for advice and guidance!

jakejakejake1

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293 Posts
Member #: 10010
Senior Member

Northants

23rd Jun, 2012 at 03:09:28pm

Hi everybody,

Been lurking here for a while and finally decided to sign up and get some questions asked and answered .

Firstly my plan is to turbo my 1991, 998.
I am aiming for up to 120 bhp and have worked out the below spec to help me get there.

I'm guessing I will need a cr around 8.5ish, up to 15psi for this kind of power.

Megajolt
12g295 head, ported with 35/29mm valves (already own this head, will need some chamber enlargement due to being skimmed, is this possible? around 25cc I think)
HIF44 turbo carb
MG metro cam or similar
gt1544/gt1548/gt1549 turbo etc (unsure which will suit best/ be easy to get hold of)
4 pin diff
MPI tank, pump, regulator etc
The biggest intercooler i can fit :)
Plus relevant items such as inlet & exhaust manifolds etc

Any advice on the spec is welcome, plus there are probably many things I haven't considered yet!

Thanks,
Jake

apbellamy

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16540 Posts
Member #: 4241
King Gaycharger, butt plug dealer, Sheldon Cooper and a BAC but generally a niceish fella if you dont mind a northerner

Rotherham, South Yorkshire

23rd Jun, 2012 at 03:18:00pm

Hello and welcome

On 11th Feb, 2015 robert said:
i tried putting soap on it , and heating it to brown , then slathered my new lube on it

*hehe!*

Mike-998

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882 Posts
Member #: 9774
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Buckinghamshire

23rd Jun, 2012 at 03:35:28pm

Double post

Edited by Mike-998 on 23rd Jun, 2012.

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

Mike-998

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882 Posts
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Buckinghamshire

23rd Jun, 2012 at 03:35:55pm

Are the standard 998 internals going to be up to 120bhp? I'd have thought you would be on the limit for at least some proper pistons?

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

BENROSS

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9812 Posts
Member #: 332
Resident Cylinder Head Modifier

Mitsi Evo 7, 911, Cossie. & all the chavs ...... won no problem

23rd Jun, 2012 at 03:50:43pm

A warm welcome! Yes your spec is ok parts wise
Depending how much has been skimmed. Of the head should be quite possible to pop it to 25 ccs in the chambers,

madonminis

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644 Posts
Member #: 9371
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East Yorkshire

23rd Jun, 2012 at 04:05:14pm

If you want the chambers enlarging talk to Benross, he's the man in the know!

BHP sells engines, but Torque wins races!


wng691s clubby

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2057 Posts
Member #: 9252
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Cleethorpes

23rd Jun, 2012 at 04:34:39pm

welcome

Done now needs redoing lol

jakejakejake1

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293 Posts
Member #: 10010
Senior Member

Northants

23rd Jun, 2012 at 04:35:30pm

Thanks for the welcomes.

Well the head is currently at 25cc, but will need to be enlarged/ dished pistons used is order to bring the CR down. The exact figures needed haven't been calculated yet.

I was contemplating reboring to the next size and getting new pistons anyway, depending on what state the bore is in.
Can anyone recommend some good pistons for a turbo 998, as I hear the old favourites are no longer available.

Brett

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9502 Posts
Member #: 1023
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Doncaster, South Yorkshire

23rd Jun, 2012 at 04:38:11pm

Welcome to TM !!

i think Wil_h's racer is still on standard 998 bottom end


On 23rd Jun, 2012 Mike-998 said:
Are the standard 998 internals going to be up to 120bhp? I'd have thought you would be on the limit for at least some proper pistons?

Yes i moved to the darkside *happy*

Instagram @jdm_brett

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