summer turbo
Turbo Mini Forums

hi this is my second post so be gentle.......

a few years ago i rebuilt my 998 to a fast road spec

+20 slipper pistons
12g940 head with pocketed block
sw5 camshaft with vernier timing gear
arp rod bolts with balanced rods
steel flywheel with orange cover and 's'plate
ballanced crank and bottom end
crank strap fitted.

tran x s/c c/r grarkit fitted
uprated diff pin fitted

the engine made 73bhp and 64lbs torque at the flywheel on the dyno

but eventually i crave more power.........

the plan is to turbocharge the 998, im going to make my own manifolds like the mirage kit. but which turbo charger would be suitable, the t2 i have read is capable of 125 but i would like 130/140, possibly the old t3 then?

i have been reading your threads about pistons but i cant seem to decide which pistons to go for to get my compression ratio lower 8.8/9.0
minispares megas
or
Hypatec
both +60's

And do you have to order the hypatec pistons from australia???

feel free to pick holes in my master plan so i can get started

That mini is determined to Kill me!!!!

Depending on what your CR is now, depends on how many extra CCs you need. You can get the extra CCs from modifing your chambers in the head or dished pistons. at a guess you'll need 4 or 5CCs extra.

Both the pistons you mention will be fine, by all accounts you'll save money ordering them from Oz, not done it myself.

For 140 bananas on a 998T you're going to need around 15psi with a T2. As I have said in another 998 thread, 15psi is not very efficient on the T2.

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

www.twin-turbo.co.uk

I had a look on minisport australia there but the only pistons they list are flat top versions I could dish them in my lathe but are there pistons out there with a dish that fit the 998 even if they need modifying a bit to get the right cr.

next up is getting the hold of some stainless and a turbo so i can mock up a manifold or i could just rummage throught the scrap bins in work for some offcuts

had a brainwave the other day, i was thinking of fitting a front mounted radaitor which leaves a nice big hole beside the engine for a turbo and intercooler but wot i need to know is wot diameter of pipe do i need to make the manifold out of. i take there will be two different sizes to allow for the siemese ports

That mini is determined to Kill me!!!!

Hi,
All the exhaust ports are the same size and all the inlet ports are the same size :)
Cheers,
Gavin :)

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My Mini build diary

but the middle exhaust port is shared And has to work twice as hard.... think i will get the calculator out................ And throw it away

Trial and error is the best way

Edited by bigmini998 on 11th Jun, 2008.

That mini is determined to Kill me!!!!

On 11th Jun, 2008 bigmini998 said:
but the middle exhaust port is shared And has to work twice as hard.... think i will get the calculator out................ And throw it away

Trial and error is the best way

Edited by alpa on 12th Jun, 2008.

std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm

If you are going to make your own manifold then hanging it over the clutch housing is bound to make the turbo easier to work with compared to between the bulkhead and block (I'm dreading plumbing mine in!). I would stick with the side rad as you want your intercooler in the airstream and thats easier done at the front than ducting air to the inner wing.

If you don't mind me asking, where did you go for your RR session? I'm not clued in on where is the best place in Norn Iron to go to set up etc.

it was a rolling road in ballymoney, the fella who ownes it is called stephen gault top man he is. but there is one in antrim aswell ds autos stephen is always busy but you do get wot you pay for when set up is concerned....
i think the only way is just to try the manifold and see... i will put up a wee build diary if you folks want from start to finish:)

That mini is determined to Kill me!!!!

Ah yes I know SG from the past but have lost touch. Glad that he is still working with minis, looks like I'll be headin for B'money when the time comes! Thanks.

http://www.twin-turbo.co.uk
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