2 petrol heads one 16v mini and a country road!!!
Turbo Mini Forums

Fuel cut at full boost full chat doesn't sound a good idea to me, surely as it cuts the fuel and the revs drop it starts to inject again, risking it running lean?

In anycase, the ignition cut should be more than enough to get the job done, works A-OK on the DON.

Ive just looked at the settings again and it does cut the spark first although it didn't start running again untill I was down to about 2000RPM, which im guessing was a fuel cut as the lambda was like 18 odd... like when completely off the throttle when slowing down?

What will a hard cut do that a soft cut won't?

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1/4mile in 13.2sec @ 111 terminal on 15psi

I don't know how your ECU does it, on the Emerald the soft cut pulls timing off, and then the hard cut stops sparks. On the DON the soft cut is 9000 and the hard cut 9200. On the rev telltale (in the ECU software) it has never been past about 9220 or so, so the hard cut limiter is doing its thing quite well.

Matty the over run fuel cut in Basic settings should be dissabled, by setting both fuel cut above and fuel resume below to 25500. Those settings are for over run fuel cut, so you wouldnt be on full throttle or any boost what so ever, its in the software you cant adjust it other than the point in the RPM that it cuts and resumes

The soft cut is in the extras menue down near the bottom with the ALS and Launch control. The spark cut idle control is just that, It cuts sparks to control idle speed. Its for race cars that have wild cams and large TB's Dont bother with it, you have ignition based idle control working anyway. The hard cut drops all sparks, that setting is in the basic settings menue.

If you have the hard cut at say 8700, the soft cut at 8500 with the control range of 200, soft cut will start to drop sparks at 8300 up to 8500, if you manage to get past 8500 and reach 8700 all sparks will be cut.

Just make sure that the Fuel cut above KPA is well above your boost pressure, and im not sure how the fuel cut will respond to a MAP sensor that has maxed out.

If it didnt come back on till 2000rpm or there abouts, I dont think it was any of the fuel cuts or hard cuts, but then i dont know whats in the depths of the software. I dont know how fuel cut above KPA responds, you shouldnt get to that point.

Tom, im not sure that the soft cut retards the ignition, that itself at full boost is bad, Im pretty sure it drops individual sparks entirely

Edited by Sprocket on 12th Aug, 2008.

Ah well ive got the soft cut set to 8500RPM and the hard cut to 8500RPM with a control range of 100RPM I guess I should adjust one of the values by 100RPM?

Edited by matty on 12th Aug, 2008.

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1/4mile in 13.2sec @ 111 terminal on 15psi

thats what i'd expect too,

qute a few production turbos (and N/A efi) use fuel cut as a rev limiter, not that that means its ok.

Ive just done a calc of speed/revs and I can supposedly do 90mph in second at 8.5K running 10's on a 3.1 diff, is that right?

Ive adjusted the soft cut rev limiter now, will give it another blast when its dry.

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1/4mile in 13.2sec @ 111 terminal on 15psi

well done mate, what an achivement cant wait to see it at MITP!

Here's what happened...missfire then cut?

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1/4mile in 13.2sec @ 111 terminal on 15psi

Stone the crows! thats good camera work
(did you get the other vid working?)

No I think it was too big for my phone! lol

What did you make of what happened nic?

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1/4mile in 13.2sec @ 111 terminal on 15psi

here you go matt,

1ST 60mph
2ND 91mph
3RD 125mph
4TH 156mph

all at 8500rpm

with tyre circ of 59.97.

Edited by robert on 13th Aug, 2008.

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

cant get thevid working but well done on getting it up and running mate.

no longer a series, but still 1.3 turbo.

Soft cut is the missfire hard cut is the engine dieing

Hard Cut cannot be the same as the soft cut, otherwise whats the point

I would set a control range of roughly 200rpm as these engines by the looks of it and from what Tom and Carl have been saying, will over shoot considerably.

So 8500 soft cut, 200rpm control range, and 8700 hard cut, that way you will know when you are on the soft limiter and it would have to overshoot by 200rpm for it to totaly kill the engine.

That is all based on a rev limit of 8500rpm, if you feel that it needs to be higher and you are happy that your engine will take the RPM then move it all up

Ah that explains the cooking of brakes then!

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1/4mile in 13.2sec @ 111 terminal on 15psi

On 12th Aug, 2008 Sprocket said:
Soft cut is the missfire hard cut is the engine dieing

Hard Cut cannot be the same as the soft cut, otherwise whats the point

I would set a control range of roughly 200rpm as these engines by the looks of it and from what Tom and Carl have been saying, will over shoot considerably.

So 8500 soft cut, 200rpm control range, and 8700 hard cut, that way you will know when you are on the soft limiter and it would have to overshoot by 200rpm for it to totaly kill the engine.

That is all based on a rev limit of 8500rpm, if you feel that it needs to be higher and you are happy that your engine will take the RPM then move it all up

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1/4mile in 13.2sec @ 111 terminal on 15psi

Heres my 'Nicolas Cage' look! And yes....the mini got cut up! lol

On 12th Aug, 2008 matty said:

On 12th Aug, 2008 Jay#2 said:
So matty tell us, does Robert really look like Nicolas Cage with welding goggles on or is that just his avartar?

Yep, I kept telling him to take the goggles off, but Robert insisted they stay on...Im convinced there is some Vampirism (if thats a word??) going on somewhere!

Yeah LT cams Harry.

Edited by Jason G on 12th Aug, 2008.

im building a na engine with megajolt but i didnt realise you can display realtime engine diagnostics like that revs and stuff!!
ace just like fast and furious lol.
can you hear the turbo spoool like that in all turbo a-series engines?"!?!
YOU RULE MAN

Eh, that ISN'T Megajolt lol

or the floor pan drops out

Yeah I never got that one, why did he have a checkerplate bolt-in floorpan anyway? And why did it spark assuming it was alloy?

DANGER TO THE MANIFOLD!