sideexitsupra Posted August 6, 2012 Share Posted August 6, 2012 Quick question guys, I have a J-spec TT and wondered if I would see any benefits from 264 cams and if they will cause any issues with the stock fuelling and ecu? Ta. Edit: I did a search but couldn't find anything. Disclaimer- it was on my phone! Quote Link to comment Share on other sites More sharing options...
T2 MSW Posted August 6, 2012 Share Posted August 6, 2012 I believe to get the best out of Adjustable cams you would need adjustable cam gears or a programable ECU. With a stock ECU you have no way to advance or adjust the timing so I would think you would see minimal benefit. Quote Link to comment Share on other sites More sharing options...
Ian C Posted August 7, 2012 Share Posted August 7, 2012 264 cams will make a big difference from 6000rpm+, it will no longer feel like it's starting to choke up around there and instead will pull hard to the rev limit. However, it'll also run a bit leaner as well. You could run it without any fuelling adjustments but it'd make me nervous, especially on a long pull. -Ian Quote Link to comment Share on other sites More sharing options...
Nic Posted August 7, 2012 Share Posted August 7, 2012 You'll lose some low down torque but gain a little in the mid and upper rev range, not worth doing IMO without having an ECU mapped to get the best out of the cams. Quote Link to comment Share on other sites More sharing options...
Guest Budz86 Posted August 7, 2012 Share Posted August 7, 2012 I have heard that HKS 264's are ok as the stock ECU will compensate. But others would benefit from a piggyback or standalone ECU. I've looked into doing this to mine too (I'm full BPU on a Jspec) and decided it would be better to get SRD cams, 650 SARD drop in injectors (for a bit of headroom so they're not running 100% duty) and a ECU but not sure which one yet. Some have said HKS F-Con or of course a Syvecs but not sure on that part yet. - - - Updated - - - Also, I'd probably get it mapped in TTC as I've heard you get very good results this way! Quote Link to comment Share on other sites More sharing options...
Luxluc Posted August 7, 2012 Share Posted August 7, 2012 You do have a piggy back ECU Tim, don't you? Quote Link to comment Share on other sites More sharing options...
Ian C Posted August 7, 2012 Share Posted August 7, 2012 The ECU won't compensate as when they are effective (around 6000rpm+), the ECU will be in open loop mode. That means it fuels according to the MAP sensor, engine revs etc. The volumetric efficiency of the engine has changed, and that's after the MAP sensor, so the ECU has no idea that the engine is ingesting the air better than it used to. So it goes a bit lean. I've seen it on datalogs Having said that I ran 256in/264ex cams for years with hybrids twins and they never had a problem, even during top speed runs at TOTB back in the day. -Ian Quote Link to comment Share on other sites More sharing options...
Guest Budz86 Posted August 7, 2012 Share Posted August 7, 2012 The ECU won't compensate as when they are effective (around 6000rpm+), the ECU will be in open loop mode. That means it fuels according to the MAP sensor, engine revs etc. The volumetric efficiency of the engine has changed, and that's after the MAP sensor, so the ECU has no idea that the engine is ingesting the air better than it used to. So it goes a bit lean. I've seen it on datalogs Having said that I ran 256in/264ex cams for years with hybrids twins and they never had a problem, even during top speed runs at TOTB back in the day. -Ian Lesson learnt, thanks Ian Quote Link to comment Share on other sites More sharing options...
sideexitsupra Posted August 7, 2012 Author Share Posted August 7, 2012 You do have a piggy back ECU Tim, don't you? Not yet........... Just trying to check it all out;-) Quote Link to comment Share on other sites More sharing options...
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