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This little one was doing same type of speed maybe fraction more Grant (it had 2ltr) at Puke had a trap reading one day 138 and no back on it. I did have to put alloy tags on the back window and drilled 3 holes along the bottom of it to stop it sucking out, specially around the sweeper at Puke. Remember in practice first time I ran it at Puke a big woosh sound and it was gone, so on went the tags and holes. Later had a very little alloy lip run along the back edge of roof and this seemed to deflect the air up instead of straight down into back area, certainly stopped the rear window vibrating as bad.
This came about after we stuck some little bits of knitting wool along the back edge and back of bonnet to see where the air was going, quick trip down northern motorway with boys running alongside in ute and observing wind flow and back to shop and play aerodynamic engineers.
Hard case really when you look back at some of the things we did.
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