Another Rolling Road Log
Turbo Mini Forums

Result.

It does actually what it says on the tin !!!!

Well it did after we advanced the ignition a bit.

Ist run was much the same as before despite my attempts to improve matters. 104hp and 95 lb ft.

Following Troys advice, we advanced the ignition for the top two lines of the map. We had it set at 18 degrees advance at 1 bar boost. Too conservative.

Anyway, the final run at 24 degrees maximum ignition advance was no better than 22 degrees, so we knew we had the optimum.

The end result was 112 hp and 105 lb ft. Just three horsepower down from expected, but boost was down to 0.84 bar from 0.88, so overall approx. a 10% improvement.

Still can't get the outer cylinders running as rich as I would like on the rolling road, whereas on the dual carriageway they are spot on.









I'll post the Megaview log later.

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."

Looks good to me. Very impressive figures for a 998.

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

Here is the MV log:



Inner cylinders ar AFR1, outers AFR2.

Lean on the outers, mainly due to trying to run a 9mSec pulse width at 6000 rpm.

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."

And these are the calcs that back it all up:

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."

where did that nat asp figure come from Paul

Attachments:

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Edited by PaulH on 6th Nov, 2009.

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."

looks alot smoother than the previous runs.

Must be on the limit of the injectors in the given timeframe

Edited by sturgeo on 6th Nov, 2009.

We could play with the injection timing to see if the improved combustion due to more ignition advance has an impact on the AFRs.

I was tempted to try different injection timing whilst at the RR, but we know that we get better distribution under real conditions, plus the clock was ticking.

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."

Well done. very impressive results.

How did the rolling road session compare to last time? Where they as friendly and helpfull as before?

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."

On 6th Nov, 2009 sturgeo said:
Must be on the limit of the injectors in the given timeframe

Schrödinger's cat - so which one am I ???

On 6th Nov, 2009 Rod S said:

On 6th Nov, 2009 sturgeo said:
Must be on the limit of the injectors in the given timeframe

I agree, 9mS at 6kRPM is 45% total duty (ie, 2 X 22.5% equivilant if it were single pulses).

I have a set myself an arbitrary limit of 2 X 20% based on everything you have shown with your testing.

Presumably on the Miglia with triple injectors and staged you are aiming for a lower duty cycle anyway ???

It's still strange the AFRs drift on the RR but not on the real road... any thoughts as to why ???

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."

Schrödinger's cat - so which one am I ???

As Rod says, you have one more on board but, but I'm Just taking my time and trying to get it all in my head before I make too much of a mess of things..

’77 Clubman build thread
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=618189

Siamese 5 port EFI testing
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=611675

All looks good to me Paul. That is a great torque curve you have there.

Another good NMS review, lets hope the TT gets on well next friday. If you are around in the morning pop over. (this is obviously NOT an open invitation to anybody)

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.

Aww! We all wanted to come and sample the burger van's delights again

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

That is a great torque curve indeed. What I find impressive is that your computations are for a 95% VE which I find impressive for a 5-port head. And since the numbers seem to match it must be close to that.

If we can confirm that inlet temperature dependency with other setups and that it is related to wall wetting, there might be a way to modify the EAE code to take that into consideration and adjust the inner and outer pulse widths or the single pulse timing accordingly. I'll have to think about how this could be tuned.

Jean

http://www.jbperf.com/

well done! :)

Yes i moved to the darkside

Instagram @jdm_brett

Good stuff Paul,

the power curve looks a hell of a lot cleaner now :)

any idea what that glitch it where the tps hits 105%?

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."

Time to invest in a better head then Paul

really?

why does everying thing spike at that point, i would have guesed at noise on the earths, the MAT signal goes mental.

.77 lambda? bit more area under the curve to come there paul ,but much nicer plot for power .
one point , i thought you were of the 've cant be higher than 85 to 89 %', whereas fab and i were of the 90 to 95% point of view ..whence the change ?sure we had a discussion on this somewhere on here ?

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