998 +60 turbo expected output?
Turbo Mini Forums

Heloooo I'm starting my turbo build this weekend and was just wondering how much power you think it'll produce. It's going to be used on the road/ track days and eventually a road trip to France :)
my plan is to build a reliable ish 120hp beast
The specs are as follows:
998 a+ block bored +60
Minispares p20950 +60 pistons
12g295 head with larger exhaust vavles, port polished and had gas flowed
Kent 266 cam
lightened, balanced and nitrided crank
standard rods
vernier duplex timing gears
1.3:1 roller rockers
Centre main strap

mirage stainless manifold and downpipe
t2 turbo
metro turbo carb and inlet manifold

pre-verto clutch and flywheel
unsure on clutch spec yet though,
straight cut drops from minispeed.
standard gearbox with cross pin diff.

sierra front mount intercooler
oil cooler
dump valve off plenum

ill be at minispares this Saturday buying my cam and bearings etc then strip the block and get the machinh work done. can't wait! :) I do have a few questions though...
what cc will +60 create?
Who does the best head work on the forum? Lol I hear benross heads are awesome.
I wanted to run a max of 20psi boost
The rods I'm using will be standard, is it worth getting them lightened and balanced? Or will this weaken them?
Will the gearbox take the torque?
Thanks, any answers are much appreciated

Jaffer :)

Seems reasonably well thought through, but you won't get 20psi from a T2. Much over 12psi and you will be just generating heat.

However, 120bananas should be no problem, and make a nice road engine.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

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

Thanks for the reply Ben, 20psi would've been an absoloute max incase I saw an r1 up my arse haha.
I will be connecting the water pipes to the turbo so it'll take 12 all day long, especially with an oil cooler.

I forgot to add, I will be running it on megajolt ignition.

Cheers
Jaffer.

When I say it will generate heat what i mean is that much over 12psi and the T2 is outside of its efficient range. The inlet air temperature just rises massively so although your boost gauge might tell you you are running higher boosts you probably won't be running much more power and probably risking detonation. No amount of cooling of the turbo will fix this.

If you want 20psi you will need a different turbo, but the T2 is a good choice for a 120brake 998.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

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

+60 is about 1046cc

Don't use the 266 cam, I regrett putting it in mine, the standard MG metro cam is better (Kent 500).

I wouldn't bother with straight cut drops, not needed, lots of money and 'orrible for your road trip.

Standard transmission is fine for the bananas you are proposing, with the exception of the diff, but you have that on your list.

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

www.twin-turbo.co.uk

^ Listen to these two they know what they are on about.

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

1275 N/A Sprite, 998 T2 Turbo Mayfair
1275 EFi Turbo

Thanks, But I'm just guessing as much as anyone. If it dosen't work I don't tell you!!

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

www.twin-turbo.co.uk

Any thoughts what turbo he should use if he wanted 20psi on a 998 wil? Is there anything that will spool at a reasonable threshold?

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

Well the GT17 will easily make that, but it's not something that I'd want to live with every day.

My IHI seems happy making 15psi, I've not tried higher, but you never know. And that makes a few psi at 2k and full boost at 3k

A similar turbo on the bread-knifes 500 Abarth makes full boost at 1500rpm and I'm sure will make 20psi, runs a bar as standard (abarth is 1400cc)

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

www.twin-turbo.co.uk

T2 50 TRIM still above 65% EFF up to 22 PSI... at 140 to 150 bhp.

at 120 bhp 15 psi above 70%eff.

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

The map may well say that, but our real life experience with the T2 on a 998 was not the same. We managed about 135 bananas, but were always on the limit of det.

Is the 50 trim the R5GT? I forget?

Edited by Ben H on 21st Jul, 2011.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

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

minispeed.co.uk/content/camshaft-kent-turbo

I was thinking about getting this cam, its the Kent 500 and its quite cheap too.
They also do a billet version for twice the price and a cross drilled billet version.

Which one would you recommend?

Thanks for all the replies guys :)
I probably won't go much over 12psi anyway, 120 brake will be enough for now.

Cheers
Jaffer :)

Thanks for all the replies guys
I probably won't go much over 12psi anyway, 120 brake will be enough for now.

Cheers
Jaffer

oh yes you will .....lol
take wil and bens advise on the cam and blower to use on the 998 these guys have had the T shirt

You don't need a billet cam, the md500 is fine

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

www.twin-turbo.co.uk

Thanks will I've just ordered the cam, ill be getting new cam bearings,
crank mains/big end bearings
New thrusts
Oil pump and
Timing gear
On Saturday from minispares
I'll save the rest of my months wage for machining costs to block and crank.

Oh and Benross can I talk to you about modifying my head?
Well, when i get paid again lol,
I'll look into which valves I wanna use etc then give you the proposed spec for a price?
Thanks
Jaffer :)

If your still in the machining phase would it not advantagous to pocket the block for a 1275 head or is this not necessary on a turbo motor with the esstimated bananarage?

edit; entire post.

Edited by zerocool_jj2000 on 21st Jul, 2011.

The 295 head makes a good road engine. For 150+ a 940 would be my choice, but in this case a well modified 295 will be the best choice.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

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

Bananarage lol!

I'm not sure but i already have a non molested 295 which i bought cheap so ill be going with that one.

Right then some progress or should i say a start has been made! I stripped the engine down tonight afterwork. Was loads of funn and only took a few hours. the block Is being sent for machining on Saturday :)
I also went minispares last saturday and bought new cam bearings, a duplex adjustable vernier timing gears and chain which look sexy lol, cam triangle plate thing and a few other bits and bobs.

The one thing i can't decide is what colour to paint the engine other than the usual red. I was thinking blue, or purple, or even 998 yellow
Here's a picture if my car and the engine.

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One from behind and a few more :)

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The fastest engines are black

Mine'll be going black.... Only because it looks good next to blue and it hides the oil stains better

Phew, thank god for that. Saves me some work.

On 26th Jul, 2011 apbellamy said:
The fastest engines are black

On 26th Jul, 2011 apbellamy said:
The fastest engines are black

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