nimsie Member 45 Member For: 18y 6m 2d Gender: Male Posted 02/10/07 12:44 PM Share Posted 02/10/07 12:44 PM hey there another blacktrack carI guess you got the same mods as me as your peak power is 1kw off minemy valve springs maxed at 268.4 and my car was detuned to 260I've just done the injectors, next will be springs and cat.Maybe a few other bits as well Link to comment Share on other sites More sharing options...
IH8TOADS Silver Donating Members 3,618 Member For: 19y 7m 24d Gender: Male Location: OZ Posted 03/10/07 06:48 AM Share Posted 03/10/07 06:48 AM IH8TOADS this could be valve springs as they don't like holding boost under heavy load, when the engine has to work hard at pushing air in and spent gases out, the stock valve springs will be the weak link...Thanks mate. As soon as my clutch is installed I'll be doing a centre muff removal, 3.5" metal cat and around battery pipe / process west pod set-up when it's available (and a re-tune). Hopefully this takes some pressure off the valve springs!! Cheers. Link to comment Share on other sites More sharing options...
gragraaa Member 21 Member For: 18y 5m 19d Gender: Male Location: mackay Posted 21/10/07 03:22 AM Share Posted 21/10/07 03:22 AM I agree, its a flow back pressure problem, I have a 4 inch dump, 5 inch cat, and im doing 303rwkw, and no problem at all . been 8 months too Link to comment Share on other sites More sharing options...
senna_T Forged Member Lifetime Members 15,818 Member For: 18y 25d Gender: Male Location: SW Sydney Posted 21/10/07 03:31 AM Share Posted 21/10/07 03:31 AM 5inch cat is definately the way to go with these things, the exhaust is so big, a 3inch is just too much of a restriction IMO Link to comment Share on other sites More sharing options...
BUL11E Member 89 Member For: 19y 7m 10d Gender: Male Location: Sydney Posted 22/10/07 06:53 AM Share Posted 22/10/07 06:53 AM mine is tuned for 254rwkw. the valve springs started going spastic after 5000rpm on the dyno Link to comment Share on other sites More sharing options...
XAH03 Member 597 Member For: 17y 4m 3d Gender: Male Location: Cairns QLD Posted 20/11/07 12:00 PM Share Posted 20/11/07 12:00 PM mine only pulled 200rwkw with standard valve springs! Link to comment Share on other sites More sharing options...
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