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.
(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
I'll add in the Autologic Discovery figures if they email them to me at a later date.
David