How is the Alfa a problem??? if the process and the GCR match? I suspect you typo-ed the GCR weight. (My GCR shows every single Alfa Spider at 2400) That car would need a TON of baggage to weigh that, I'd think.
Typo and an error on my part. HP number I had probably was gross, not net.
Car works out to: 17 x 1.25 x 115 = 2445 GCR = 2400 or just a little too low per the GCR.