that’s a interesting theory about the weight of passat vs. 
Ibiza , I can actually relate to that as my previous toledo seemed to have better handling than my 
Ibiza sport, could be something to do with weight distribution  as 
Ibiza is very front heavy and maybe putting someone in the back could 
help the handling. However your times where lap times hence lots of cornering, I suspect if the put the two cars in a straight line race the 
Ibiza would win easily. So in relation 0-60  30-70 times should be noticeably different compared to a mapped 
Ibiza and passat
		
 
		
	 
Maybe.
0-60... I think the Passat got its power down better tbh, but had to clear 1st gear before it really got into its stride, whereas the 
Ibiza seems better in 1st, when it's not spinning up. 
In short, I'm not all that impressed with the chassis of the 
Ibiza compared to the Passat.
30-70... I don't think there would be that much in it.
Handling wise, yes the Passat almost certainly had more equal weight distribution as well as the other chassis plus points I mentioned before.
One mate who watched me slinging that round the track mentioned it did quite a bit of 'leg cocking' on bends, as in it kept lifting the inside rear wheel like Clios tend to do when pushed hard on bends etc. 
A good sign the chassis was nice and stiff on such a big car, anyway.
*sigh*
I really do miss that car - it gave all sorts of supposedly more sporty smaller stuff a really hard time on both the road and the track and was more comfy ride wise, plus it had loads of room for 'entertaining' in the back. 
Today I sussed something else out as well... the 
Ibiza is heavily loaded up insurance wise despite it being only a group seven.
My son turned 17 on Saturday, so just out of interest I ran some quotes today on various cars including the 
Ibiza, with him as the main driver and me as a named driver, the quotes for TPFT were:
106 1.1 (IG 3) = £985
Clio Diesel (IG 4) = £1080
Passat TDI Sport 130 (IG 12) = £4050!
Ok... so look at the spread of cars so far, and their respective insurance groups... the 
Ibiza is group 7, so how much do you reckon they quoted on that?
£2k?
Nope....  £3995!