Scootg Posted February 6, 2014 Share Posted February 6, 2014 Hey guys, I recently had a pair of Berks Hi-Flow Cats fitted to my HR Z. Since then, when I go full throttle, as I found at Santa Pod recently, I get a judder. It's like the car is trying to stall. It'll do it maybe three times then clear and full power returns. I thought it could be the cats needing to settle in, but it's been happening a few weeks now. Would a simple remap cure this? Thanks, Scott Sent from my iPhone 5S using Tapatalk Pro. Quote Link to comment Share on other sites More sharing options...
ioneabee Posted February 6, 2014 Share Posted February 6, 2014 O2 sensors ? Quote Link to comment Share on other sites More sharing options...
Scootg Posted February 9, 2014 Author Share Posted February 9, 2014 I don't know how to check if I'm honest. Sent from my iPhone 5S using Tapatalk Pro. Quote Link to comment Share on other sites More sharing options...
HARMLU Posted February 9, 2014 Share Posted February 9, 2014 Do you have the engine light come up on your dash? If not, couldn't imagine it being anything to do with the cats. Might just be coincidental Quote Link to comment Share on other sites More sharing options...
cmck13 Posted February 9, 2014 Share Posted February 9, 2014 I think you've hit the nail on the head when I was thinking of those cats and remapping I was advised on here to have a remap after the cat fitting. Clearly they affect performance, and to get the best a remap after fitting was advised. Quote Link to comment Share on other sites More sharing options...
Neilp Posted February 9, 2014 Share Posted February 9, 2014 have you ever had a remap? Without a remap theres a chance you may be running your engine outwith the required AFR's. Quote Link to comment Share on other sites More sharing options...
Scootg Posted February 10, 2014 Author Share Posted February 10, 2014 Just had RS Tuning remap the Z turns out it was running VERY lean after the Cat fitment. Seems to be cured now. I'll update if it returns, but thanks all for the advice. Sent from my iPhone 5S using Tapatalk Pro. Quote Link to comment Share on other sites More sharing options...
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