Mini hillclimber 1380cc
Turbo Mini Forums

Hi guys,

I've been on the forum for almost a year now and since then I think this forum has always thought me good knowledge with regards to internal combustion and A-series programmable fuel injection. In the past year I have managed to convert a standard 998cc engine to fuel injection and electronic ignition using the Megasquirt Ms3x, with a lot of help from Paul S. Also this summer I've fitted a GT1549 to the same engine.

With regards to the modifications done so far, I'm very satisfied with the fuel injection however I'm still on the learning curve with regards to the turbo mod. Currently the turbo is boosting up to 7psi.

To proceed my brother and I are considering to convert the mods done so far on a larger engine. Currently we have a stock 1275cc sitting in the garage, which will be overbored to 1380cc. The purpose is to modify it for hillclimbs, while in the process gaining some knowledge and having some fun. The engine will be fitted to a road legal car, so preferably the mods would allow an occasional, fast Sunday drive

Having said this, we are always on a budget so basically not all the mods will be purchased at once, but will develop on the project incrementally. So what do you guys prioritise in such a project ? My opinion is to overbore the engine to 1380cc, and use omega or powermax pistons, choose a suitable camshaft, uprated rockers, lightened flywheel and fit a turbo high capacity oil pump.

What are your views ?

Thanks in Advance,
Carl

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Edited by Barrieri on 3rd Oct, 2016.

Assuming that you are planning on building an NA 1380, why not just stick with the 998 turbo?

It'll run in the same class as a 1380 and you already have it. 12psi will see decent power, at 15psi it'll be a flying machine.

Then you can instead spend your money on lightweight goodies and things to make it handle.

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

The problem Wil is that the turbo is not boosting more than 50KPa. Even to go up to 50KPa I need to be at around 5000RPM WOT.

My plan was to convert the turbo setup to the 1380cc.

However I do like your idea of continuing the 998cc development instead, but what should I do to raise the boost ? I am assuming that the turbo is too big for the 998cc, what do you think ?

Edited by Barrieri on 3rd Oct, 2016.

By the way, this is the 1275cc I have sitting in my garage. What about its cylinder head ? Is it a good one ? From the little research I've done its a 12G940.

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A 12g940 is the standard 1275cc head. Its a good Base for a modified head if that's what you mean. Nothing special as standard tho.

As for your turbo setup a GT15 should be a good match for a 998cc. The ECU should give you good control to run very high boost levels but you must make sure the compression ratio is suitible and run a big intercooler. I too would stick with the 998 for hilclimbing. Its a cheaper way to get power than a NA 1380cc.

There are lots of choices for a decent turbo for a 998. A GT1548 worked well on mine. I don't know what a GT1549 is from, but it sounds too big.

I'd be tempted to try the IHI3 (I think it's a 3) from a Fiat 500 abarth. it worked fantastically on the abarth my wife had.

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

The GT1549 is from the Rover 25 SDI, 45SDI, 75SDI and MG ZR 2.0Turbo Diesel

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Have you adjusted the actuator pre-load to increase the boost?

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

20l turbo diesel turbos usually work ok on 998s (as a rough guide). But full boost at 5k at WOT and not earlier would suggest either the wastegate or manifols is leaking or it's too big.

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

Yes Paul, the wastegate is an external one and I have currently blanked it to see if it is the problem, but it seems not.

One of the apparent problems was actually a small leak in the inlet and solved that. Now I am reaching aaproximately 150KPa and occasionally 160KPa but definitely not more.

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By the way Wil, I think you have changed my opinion I think I'm sticking with the 998cc. However I think it needs some serious work.

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What have you done about the internal wastegate?

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

I fabricated a rod to keep it closed.

That chart suggests a huge leak.

Just double-check that the rod is holding it closed and not open.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

This is mine at Harewood, not a great advert for a 998 turbo, but the failure was my fault.

https://www.youtube.com/watch?v=WP3NOyguBec

And at Thorsby

https://www.youtube.com/watch?v=CzdPTMNCTUA

There are other vids of the sister car too.

On 4th Oct, 2016 Barrieri said:
By the way Wil, I think you have changed my opinion I think I'm sticking with the 998cc. However I think it needs some serious work.

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

Good job Wil :) In the video says its a 7 porter. I definitely cannot afford that right now.

How did you notice the leak Paul ? Actually that graph was plot before I solved the intake leak. Now that I solved it, it is reaching around 150KPa, occasionally rising to 160KPa.

Obviously the internal wastegate rod has not yet been fitted.....looking at the picture it looks to be in the wrong position?.......

On a side note, the 2.0L SDI was a 134hp deisel on a standard boost of 15psi, so should boost better than it is on a 1.0L engine

actually Sprocket, to fit perfectly in front of the cross member I had to cut the lever arm of the internal wastegate and weld it on the opposite side.

To understand, the rod I've fitted is pushing the lever away from the compressor, which is equivalent to pulling it towards the compressor in the original configuration

You shoukd see more than 7psi boost, so i agree with others, something isnt right.

Was the turbo a new unit or a used one?

Edited by Sprocket on 4th Oct, 2016.

No the turbo was new.

An issue might be a.misinterpretation. I am reading the MAP downstream of the throttle body. Now I know that usually the boost is tapped from the compressor housing, but my reasoning is that at WOT the throttle body shouldn't be much of a restriction so theoretically the MAP at the inlwet manifold should be almost equal.to the MAP at the compressor housing. Isn't it ?

If I have to read the boost from the compressor housing I need to install another gauge, as I am using the inlet manifold MAP tapping as a load parameter for the MS3x