Roadsport K - upgrades.
Discussion
Been pondering some enhancements / additions to my k series roadsport.. not that I particularly think it needs more power. Part navel-gazing, part I have an urge to fiddle..
Cams: Supersport, or BP270H – with or without verniers? Both seem broadly comparable with the 270’s being a little more sporty than the supersport.. Having read around I’d not want to take the rev limit past 7200 (I understand the supersport ecu gives a higher limit, but then it seems eventual piston failure is all but inevitable if you make use of that limit). I’d also want to retain the standard hydraulic followers.
Verniers: Seems from reading DVApower that the cam timing tends to be a smidge retarded. Much (any?) mileage in properly timing the standard cams, or any point in putting in ‘hotter’ cams without verniers?
Exhaust: Have the standard 4:1 internal with weedy looking headers. Powerspeed seems to be the stock answer, possibly more inclined towards trying to pick up a ‘standard’ system off a one of the more up-spec cars that flows better, or false economy? Is there much point in doing any of the above (cams etc) without the exahaust?
I can see possible(?) advantage in sticking to the supersport spec on the basis it makes the car a ‘supersport’, and is probably better for resale (opportunity & value) than just messing around with custom spec; not that I’m looking at it as anything other than a money sink, I just don’t want to make the car unsellable in the future / get the impression that ‘modified’ caterhams don’t go down too well?
Appreciate any thoughts / advice.
Cams: Supersport, or BP270H – with or without verniers? Both seem broadly comparable with the 270’s being a little more sporty than the supersport.. Having read around I’d not want to take the rev limit past 7200 (I understand the supersport ecu gives a higher limit, but then it seems eventual piston failure is all but inevitable if you make use of that limit). I’d also want to retain the standard hydraulic followers.
Verniers: Seems from reading DVApower that the cam timing tends to be a smidge retarded. Much (any?) mileage in properly timing the standard cams, or any point in putting in ‘hotter’ cams without verniers?
Exhaust: Have the standard 4:1 internal with weedy looking headers. Powerspeed seems to be the stock answer, possibly more inclined towards trying to pick up a ‘standard’ system off a one of the more up-spec cars that flows better, or false economy? Is there much point in doing any of the above (cams etc) without the exahaust?
I can see possible(?) advantage in sticking to the supersport spec on the basis it makes the car a ‘supersport’, and is probably better for resale (opportunity & value) than just messing around with custom spec; not that I’m looking at it as anything other than a money sink, I just don’t want to make the car unsellable in the future / get the impression that ‘modified’ caterhams don’t go down too well?
Appreciate any thoughts / advice.
SS cams are a lot hotter than BP270s. With the stock pullies the cams will run around 8-10 degrees retarded so it is imperative to time them correctly with verniers.
In my experience with SS or equivalent (633 profile) cams properly timed with verniers you should lose little mid range and gain 10-15BHP at the top end which makes a cam upgrade very cost effective.
Dave
In my experience with SS or equivalent (633 profile) cams properly timed with verniers you should lose little mid range and gain 10-15BHP at the top end which makes a cam upgrade very cost effective.
Dave
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