Yet Another Rolling Road Log
Turbo Mini Forums

Plots from the RR sessions at Smart Performance yesterday:

The RR printout:


Odd behavour on the third run, so we aborted. It is not clear at this moment in time if these are flywheel or wheel powers as we did not complete the coast down run.

Run 1:


Hit the rev limiter hard and a nive big bang out of the exhaust
A little bit of AE spiking to sort out.


Run 2:

Looks OK


Run 3:

Nothing untoward except that the boost did not build as quick, but note how the revs rise twice as fast. I think that Chris must have halved the resistance on that run.

I've plotted the flywheel power, based on the assumption that the above are wheel powers and we are getting the target 120hp. I'll wait for the confirmation before posting the new curves.

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."

Funnily enough Paul, Garry had something similar on one of his runs, inexplicably he couldn't get the motor to make boost, as if it wasn't loaded enough.

I thought I'd forgotten to tighten a clamp in the rush to put it back together, but it was fine on the road both there and back.

Robert mentioned something about the resistance/speed of the rollers affecting boost?

In the 13's at last!.. Just

I must say although from a couple of cars, mine included, the numbers seemed credible, it did seem to be quite a low resistance and hence high acceleration rate that was being used for the sweep tests.

The T2 does take time to spool up, so if I'm pushing it in 1st, then I will not see boost until 5000 rpm. By the time I get to top gear it is usually all in by 4000rpm.

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, Chris has confirmed that we did not do the coast down run, so here is the flywheel power curve using the losses from the NMS rolling road. I think that we should take the Run 3 data with a pinch of salt for now.





It also at 11.6 psi boost, so I'm well pleased.

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."

good stuff!

That torque curves not very flat though is it!

That could still be down to running too rich. Looking at the datalogs from last years RR days (flatish torque curve) we were running leaner and steadier afr's. Since we've fitted the new FPR we need to do a little more fine tuning.

On 3rd Oct, 2010 Joe C said:
That torque curves not very flat though is it!

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 notice afr2 stays pretty flat and afr 1 goes slighty richer at the top end

Edited by Paul S on 3rd Oct, 2010.

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."

ah so afr 2 is the outers then?

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."

LOL

well its certainly doing the do!

Well, it seems to be doing incredably well.

I've just calculated the SOT figure and fell of my chair.

Must wait until our psycho-analyst has sorted out the unsmoothed numbers before publishing.

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."

paul ,can you do an overlay of your previous best power graph from nm ?

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

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."

blimey that was quick ! now can you do a boost overlay for the two runs ?

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

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 makes me even mor sceptical on my torque figures of 140ftlb. I'll stick my graph up later.

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

www.twin-turbo.co.uk

Boost data added.

This is taken from the MS logs as it was not available elsewhere.



Spooling at a different rate, but the NMS RR did have a lot more resistance.

Let me know when you are ready for the SOT curve!

Edited by Paul S on 4th Oct, 2010.

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."

Do you want MAT's and AFR's as well Robert?

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."

Just a note about our rollers that might help you.

The power runs are done via an inertia test. I.e. no load was applied to the rollers. The resistance is just the rollers weight.

So the load was definitely not changed from one run to the other.

Maybe the engines revved up to quickly to produce the best boost?

Chris

Thanks Chris.

Here are the two MV logs from NMS and Run 2:

NMS - 112hp run


SP - Run 2

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."