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I've run a fair few profiles from different manufacturers, including Cat Cams and Piper.
My Clio was used to test the BP270's, on standard timing it had an almost standard idle, nice wide power band and made 192BHP with 12% trans. losses.
It's worth noting that the Pipers now come with a shim...
The rocker cover holds the cams in place and you cannot take it off without removing the pulleys - you'll have to take the timing belt off at the same time.
Worth a look here:
http://www.cliosport.net/forum/showthread.php?694181-Piper-cams-kit
Although I would be interested to see what gains can be had from 197 cams.
I've run a few cars, and know of others who have on these rollers and they've all been in the right region. I agree to get a good comparison a run with the car standard is required..
They're now supplied with a shim that sits under the hydraulic follower to keep the followers in range and stop them tapping!
I don't know how you've calculated your transmissions losses Martin, but with 12% gives 192BHP ATF and 15% gives 197 BHP ATF. ;)
I thought it would be flat lower down...
I was a bit unsure of whether to fit Piper Cams as even though they have been produced more power than 428's (see below), they have been known to be a little noisey - but as they are now supplied with a shim to keep the follower in range and keep them quiet I went for it...
It locks the pulleys in place, without this you'll bend the tool in the lower photograph when undoing or doing up the camshaft pulley bolts - putting the timing out.
ESP/cruise control
I retrofitted cruise control to mine, see:
http://www.cliosport.net/forum/showthread.php?570338-I-ve-fitted-cruise-control-but-ESP-doesn-t-work