More on Chipping
David French
plotted torque and power curves from each of Superchips, van Aaken and
Diagnos on the same graph.
(The Diagnos graph is for a Defender TD5, the others are from Disco (vAd
Auto, Superchips Manual) - so I appreciate it's not a very fair comparison.
The Defender TD5 is supposed to be lower powered than the Disco from what I
understand.)
I've plotted both "before" and "after" figures for each. And I've ended up
with 6 different lines on each graph, each of which bears virtually no
resemblance to any of the others.
The big problem appears to be that the "before" curve for each manufacturer
varies as much as, or more than, the difference between the "before" and
"after" curves. In other words, the cars they're testing are vastly
different, before they've even done anything to them. OK, so they are 3
different cars, but given the engine is still a TD5, I'd expected them
either to be the same shape, or the same magnitude, but they're not really
either. So, comparing the "after" curves doesn't really bear scrutiny.
For example, the Superchips Disco (auto) isn't really getting much torque up
until about 2500rpm, whereas the other 2 are well up the curve at 1750.
On the other hand, the Autologic Defender is pretty pooped in the Power
front at 4000rpm, whereas the van Aaken drops off at 4500, and the
Superchips at 5000. All of these are "before" curves.
So, I'm really no better off than I was before, but I would say the biggest
difference between "before" and "after" is with Autologic on the power, and
vAd on the torque in the low revband, Autologic on the torque in the high
revband.
If anybody wants to see mi spreadsheet then I'll post it on
www.lobsternet.org/discoveryii/perf.xls, just as soon as I can get my
network drive working again. Please note, my figures are taken from printed
graphs, not original data, so don't expect them to be as accurate as the
vendors' figures.
I'll add in the Autologic Discovery figures if they email them to me at a
later date.
David
David French
news:c5h5li$1l0ms$1...@ID-160280.news.uni-berlin.de...
> Well, following on from the various threads involving chipping TD5s, I've
> plotted torque and power curves from each of Superchips, van Aaken and
> Diagnos on the same graph.
> If anybody wants to see mi spreadsheet then I'll post it on
> www.lobsternet.org/discoveryii/perf.xls, just as soon as I can get my
> network drive working again. Please note, my figures are taken from
printed
> graphs, not original data, so don't expect them to be as accurate as the
> vendors' figures.
I've added in the figures for Dastek PowerPlug as sold by DiscoParts. What
I'm mainly learning here is that everybody's dynamo seems to give totally
different readings than everybody else's. I'm not convinced it's just down
to the vehicles.
For example, the Superchips modified Disco gives about the same torque out
as the van Aaken *un*modified one... in fact a lot less, at the base of the
rev-band.
It would be nice to get all of these things on the one dynamo and test them
all properly.
David
Paul - xxx
> I've added in the figures for Dastek PowerPlug as sold by DiscoParts.
> What I'm mainly learning here is that everybody's dynamo seems to
> give totally different readings than everybody else's. I'm not
> convinced it's just down to the vehicles.
That's 'cos although there is a standardised method of calibration for the
dyno's, there isn't a standard method of where the dyno readings are taken
from, and how. Some may be taken from the road wheels, and these _ought_ to
be most repeatable, but I've seen manufacturers fitting smaller or larger
wheels, for instance, to get more 'suitable' torque / power curves .. ;)
Some are taken from the crank, some from a n other driven area, and some may
be not even be true power curves, but extrapolations from sensors in the
fuel / air / timing systems ...
I view torque / power curves with an amount of circumspection unless the
publisher / manufacturer details exactly _how_ the curves are produced.
--
Paul
(8(|) Homer rocks .. ;)
Austin Shackles
<notchec...@hotmail.com> enlightened us thusly:
>
>I view torque / power curves with an amount of circumspection unless the
>publisher / manufacturer details exactly _how_ the curves are produced.
The only thing that'd make sense is to do road-wheels with standard diameter
tyres.
--
Austin Shackles. www.ddol-las.fsnet.co.uk my opinions are just that
"Remember that to change your mind and follow him who sets you right
is to be none the less free than you were before."
Marcus Aurelius Antoninus (121-180), from Meditations, VIII.16
Marshall Wilkinson
"Austin Shackles" <aus...@ddol-las.fsnet.co.uk> wrote in message
news:b43r70p06am5nqsrd...@4ax.com...
> On or around Wed, 14 Apr 2004 18:59:53 +0100, "Paul - xxx"
> <notchec...@hotmail.com> enlightened us thusly:
> >
> >I view torque / power curves with an amount of circumspection unless the
> >publisher / manufacturer details exactly _how_ the curves are produced.
>
> The only thing that'd make sense is to do road-wheels with standard
diameter
> tyres.
And same type of tyre. Different amounts of energy could be lost in the
sidewalls of different tyres. Best to standardise to the max.
Marsh.