what are my options?
Turbo Mini Forums

iv read everything i can find on it, but i havent found the exact details i was looking for.

im looking to turbo my bog standard 998, will have a differnt head on to drop the CR but nothing to tasty, and the neeccacery changes to the box and clutch,

firstly i was wondering if theres a best turbo , the turbos i have forund to be suitable are the T2, GT1544( can it be any begginigng with 15 ?) and the ihi rhf4 , is there much to tell them appart, or will they all do the job fine?

secondly if anyone has a standard 998 but turboed, what sort of proformance are you geting out of it ,is it worth doing with a standard engine?

thankyou :)

As for the turbo, I think the norm here is to go with a gt15 (1544, 1548 or 1549) each having slightly different characteristics (don't ask me what though ) They will all work, but the easiest thing to do would be to get their maps for a comparison and see which would suit your engine.

As for standard 998 turbos, I think someone on here got 80 odd out of a bog standard one (just an enlarged head i think) and for the small amount it costs a good cam and head can put you near the 100 mark.

Hope that helps :)

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

Yes it's worth doing, 80 to 90 bhp is achievable without having to change the clutch, box or diff (if it's all ok in the first place).

All the turbos will work pretty much the same and will be ideal for your project.

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

www.twin-turbo.co.uk

Its also worth doing cooling mods :) gotta keep the block cool

On my original roadgoing 998 conversion I used a standard 2-core rad, that had 30% of its fins missing and it was fine. so it can be done all standard if it is all working as it should in the first place.

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

www.twin-turbo.co.uk

thankyou very much everyone for clarifying that for me,

now its time to bite the bullet and get buying !

cheers

you won't regret it

hope not

Ive been looking at the maps on the Garrett site. What turbo you choose really depends on your application. I'm building a boosted 998 for autocross and from the looks of the maps I have chosen the gt1548 for what looks like to be a smoother powerband. It's a little numb on the bottom end so it won't light the tires as bad, yet it will still move a fair bit of air up top so it will have more top end.

If you are building a daily, go with the gt1544 and it will have a nice amount of torque where you can use it. But if you are building something that will be spending a fair bit of time above the 3500rpm mark, then go for the larger option.

This is an old thread, but I'll respond anyway.

The GT1544 would be a good choice for a boggo 998. But the 48 will be better.

With a 48 what you'll get is an easy 120bhp, and around 135 as a useable maximum. Boost will climb from 2500rpm or a bit earlier, with maximum boost available from a littte over 3k.

You will get a slug of torque as boost builds, which on a loose surface will spin the wheels in every gear.

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

www.twin-turbo.co.uk

120bhp out of a 998 + a GT1548 with what mods?

Nothing special. 8.5:1 CR, decent 12G940 or 12G295 head, cam (MG, 266 or 274 are a good choice) good IC and 12 psi boost, or a bit more.

Pretty mucg the spec I drive every day, although I have an IHI RHF4, but very similar to the GT1548 in performance, I get boost a little earlier.

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

www.twin-turbo.co.uk

Just a standard HIF44 turbo/modified for boost I would guess

The car Wil is talking about has SC injection, but it was similar performance with the metro turbo carb.

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.

giggidy

theres plenty of life in the 998!

what sort of torque are these putting out? Ballpark figures are fine. Obviously EFI helps with refinement and control, but a HIF44 wouldnt be too far off

carb would be fine. torque is over 100lbft

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

www.twin-turbo.co.uk

Didn't know you could get that from Little work on a 998. Very impressive

BHP sells engines, but Torque wins races!

See my build thread. First time round i used standard engine with a HIF44 and a T2 with good results circa 80 bhp. Then went to the 12G295 head and MG NA camshaft to get 110 bhp

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=326421

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

The road engines use pretty basic cast pistons. I once built a 90bhp turbo 998 on a 70k engine that was totally standard, no problems.

The hillclimb 998 turbo uses forged pistons and is now getting close to the magic 200 bananas.

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

www.twin-turbo.co.uk

With a 12g295 head is it best to go for Hypatec flat tops or dished pistons?