OMS CF09 TT4
Turbo Mini Forums

Interested to see your progress Wil, it must be really hard with so many variables to dial it in so it works for your driving style.

Nice work, I bet she goes some!

My driving style has always been brake late and chuck it in. Which works well with the monoshock at the front.

The difficult thing is realising how fast the thing can corner. Lots of variables yes, but like the mini you just take your time and make lots of notes.

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

www.twin-turbo.co.uk

I stripped a cheap ebay gt17 core down t'other day and it had a 180 degree thrust bearing!!!! in it. I know some cheapy stuff is fine and some junk just letting you know to keep an eye on it. the core it was replacing had foreign object damage on the compressor, so I reused the old thrust and journal bearings and the cars been fine. I didnt want to risk it with the shitty thrust bearing.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

p.s. keep us up to date, beautiful machine.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

Finally getting somewhere with the OMS. It's now lighter, has new less draggy wings and a nice power graph.

This was running at 10psi according to the RR MAP sensor which we callibrated after as I thought it was wrong. Unfortunately, just as we were about to strat mapping the boost the turbo-return scavange pump shat the bed. The magic 200 bananas seems easily achievable with a couple more psi.



Next thing is a test day, if the terminal speeds are where I wnat them the boost will stay as it ism if not it'll get a tweak:)

Edited by wil_h on 7th Apr, 2017.

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

www.twin-turbo.co.uk

Nice piece of kit 🚗

very achievable given what you've still got to play with

Here's a cool video 360 of the test day. works really well on a phone.

https://www.youtube.com/watch?v=0Z9Gz2pb3UI

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

www.twin-turbo.co.uk

That is very cool!
What did you use for filming?

Nice run too

Dazed and Confused....

It's a Ricoh Theta S. Easy to use but a bugger to edit and process to make it work.

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

www.twin-turbo.co.uk

Honestly will, I can see why you're struggling with the car, looking at that vid the rear wheel have far to much neg camber and are toeing out a fuck load,

also there appears to be two people driving which won't help.

carl

WWW.FORCE-RACING.CO.UK PLEASE CLICK HERE

That looks seriously rapid

Very good.

I had to explain to my Dad that the video wouldn't work if using Microsoft IE.

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

www.twin-turbo.co.uk

Nice idea, but I've got a stiff neck from whatching the vide over my left shoulder so I could see where you are going.

A small update just for fun.

I got the car back on the RR last week. The idea was to finish the mapping we started and then play with the boost.

With the boost now increased to 1.25bar it's making over 200 bananas ATW. The RR I use is frequented by lots of my competitors, so it's a comparable figure to the 1100cc bike engines making 190.

It also has over 110 toques, again comparable to the 85 the 1100s make.

Unfortunately, an accidental overboost bust the ringlands on No4. No other damage. Worth noting that the power run was taken with the bust ringlands and only to 10,000 rpm, 1000 below max rpm.

Her's some 360 videos from Doune - A fantastic hill.

me
https://www.youtube.com/watch?v=fEn4ZHZw5r4

Ben
https://www.youtube.com/watch?v=SmIKKdQU8cw

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

www.twin-turbo.co.uk

Totally wicked😃

Own the day

man that looks scary...

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

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

www.twin-turbo.co.uk

I like the 360 videos!

Shame about the piston damage. hope it was easy to sort.

Car is all back and running now. So we'll be back out next weekend.

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

www.twin-turbo.co.uk

Looking forward to seeing it at Barbon

Work progresses on the OMS. Over the winter we have made it lighter, reduced the drag, lowered the engine 32mm and put a new manifold on; plus lots of other minor changes.

Hopefully this will all translate to better times, we were really making progress last year.

Now looks like this, just needs some decals adding.

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

www.twin-turbo.co.uk

The problem we have is the power. We changed from a really bodged up 'log' type manifold to a nice equal length jobbie. Like below



and the power changed like this - Black is with the new manifold, Red with the old (note this is transposed from a print-out, so not no comments on some odd bits)



What I'm after is thoughts on why the power seems to suddenly drop off at 9500 rpm. It's clearly spooling the turbo up earlier and making more low down torque, but not sure why it suddenly falls away. Thinking about manifold header lengths having a similar effect to a cam change????

For information, following this session at a test day the engine lunched itsself. The failure was cased by a sticking exhaust valve. Could a sticky/leaky exhaust valve cause such a drop?

Feel free to think out loud........

Edited by wil_h on 26th Mar, 2019.

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

www.twin-turbo.co.uk

Looking good Wil! Was just thinking about this other day as was talking about the TT3! Do you still compete in that too?

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