downhuman Posted February 28, 2013 Share Posted February 28, 2013 Hey guys Since installing the HFC's my HR now drives a bit oddly... If you suddenly floor it when in mid rev's it hesitates and 'feels' less smooth once accelerating than it did. No CEL codes, checked on a reader. I still have an issue with sound so gonna check for blows but not sure this would affect drive-ability anyway. Any ideas? Thanks Quote Link to comment Share on other sites More sharing options...
downhuman Posted February 28, 2013 Author Share Posted February 28, 2013 Oh - and traction control on or off, doesn't matter Quote Link to comment Share on other sites More sharing options...
NeilMH Posted February 28, 2013 Share Posted February 28, 2013 Did you have it remapped after fitting the new bits? Quote Link to comment Share on other sites More sharing options...
downhuman Posted February 28, 2013 Author Share Posted February 28, 2013 Nope.... Quote Link to comment Share on other sites More sharing options...
Mark@Abbey m/s Posted February 28, 2013 Share Posted February 28, 2013 This is something we have seen a few times prior to remapping on the HR engined cars. 1 Quote Link to comment Share on other sites More sharing options...
downhuman Posted February 28, 2013 Author Share Posted February 28, 2013 This is something we have seen a few times prior to remapping on the HR engined cars. Do the sport cats (Stillen) always sound like the baffles are broken too?? At 4krpm it sounds a bit like a blow / metallic resonance which is really annoying - I'm not really overly impressed with the HFC experience so far... Is the hesitation 02 sensor related Mark ? And is uprev the only solution? TBH I may take them off and sell them as the noise is doing my head in! Quote Link to comment Share on other sites More sharing options...
NeilMH Posted February 28, 2013 Share Posted February 28, 2013 In which case it may be running lean. The sensors/ECU try and restore the engine running to OEM settings but the new bits are probably taking it outside the range of adjustment. This also means that you are not gaining any real advantage from your upgrades. Best to talk to Abbey or one of the other authorised tuners about an Uprev re-map. It will transform the car. 1 Quote Link to comment Share on other sites More sharing options...
NeilMH Posted February 28, 2013 Share Posted February 28, 2013 Whoops hadn't seen Mark's posting. 2 Quote Link to comment Share on other sites More sharing options...
downhuman Posted February 28, 2013 Author Share Posted February 28, 2013 I'm going to get the car on a ramp today and see if the stillen cats ARE blowing or just sound cr@p with the Milltek first - as if they're definitely installed correctly they will be heading onto ebay soon anyway!! Quote Link to comment Share on other sites More sharing options...
NeilMH Posted February 28, 2013 Share Posted February 28, 2013 The rasping you refer to is not an uncommon observation. I have Berks and I like the sound in combination with the Milltek. I don't know if Stillen HFCs differ. Mark would know. Quote Link to comment Share on other sites More sharing options...
Mark@Abbey m/s Posted February 28, 2013 Share Posted February 28, 2013 Stillen are normally noisier than Berks we have found. We have run De-cats with Milltek system's on HR without any noise hassle normally so it seems strange your having issues. Pete on here had De-cats on his HR car with a Milltek without any issues the car wasn't noisy in the dyno. The driving issue is due to 02 response time , the HR are mapped so rich stock they don't run too lean once bolting HFC's and a exhaust system. 1 Quote Link to comment Share on other sites More sharing options...
NeilMH Posted February 28, 2013 Share Posted February 28, 2013 Stillen are normally noisier than Berks we have found. We have run De-cats with Milltek system's on HR without any noise hassle normally so it seems strange your having issues. Pete on here had De-cats on his HR car with a Milltek without any issues the car wasn't noisy in the dyno. The driving issue is due to 02 response time , the HR are mapped so rich stock they don't run too lean once bolting HFC's and a exhaust system. Ah....didn't know that HRs run rich...you learn something every day. Quote Link to comment Share on other sites More sharing options...
downhuman Posted February 28, 2013 Author Share Posted February 28, 2013 Spoke to Mark - thanks mate Quote Link to comment Share on other sites More sharing options...
glrnet Posted February 28, 2013 Share Posted February 28, 2013 I don't know if this is related but it might be worth you thinking about. Will370z bought Stillen HFC's for his 370 and had all sorts of problems with fitment I believe, from memory I think the general consensus was that Stillen quality seems to have deteriorated from what had been previously experienced. Maybe fir a PM off to Will for the full story. 2 Quote Link to comment Share on other sites More sharing options...
downhuman Posted February 28, 2013 Author Share Posted February 28, 2013 Thanks mate Quote Link to comment Share on other sites More sharing options...
Bockaaarck Posted February 28, 2013 Share Posted February 28, 2013 Really feel for you on this downhuman. It seems you're not getting the same great experience that the rest of us who've had the Berks HFCs fitted have enjoyed. Getting in touch with Will is great idea, see what he comes back to you with. I hope its a fitting issue which you can get sorted. Or if you've decided you want to get rid of the Stillen's and you want to head down another route that you can do that as easily as possible. Quote Link to comment Share on other sites More sharing options...
downhuman Posted February 28, 2013 Author Share Posted February 28, 2013 Yeah heading off to my mate's shortly. Mark suggested a possible blow between manifold and cat ... fingers crossed it is simple as that. Otherwise - they go! Quote Link to comment Share on other sites More sharing options...
Will370z Posted February 28, 2013 Share Posted February 28, 2013 Stillen hfcs werent the issue in my case, never even got them on the car, we just compared them in size and fit the berks. Issue was the stillen exhaust itself but that was on a 370 Good luck getting it fixed but regardless you will get a tinny rasp from the hfcs, its a character of the part Quote Link to comment Share on other sites More sharing options...
downhuman Posted February 28, 2013 Author Share Posted February 28, 2013 Back for Mark @ Abbey and he thinks they sound as they should... Which means I don't like the HFC Milltek combo! I will probably go back to oem shortly so watch the for sale thread for some brand new HFCs shortly Quote Link to comment Share on other sites More sharing options...
NeilMH Posted February 28, 2013 Share Posted February 28, 2013 Shame but best to go with what you like and resolve it asap, as you are doing. I recently bought a hatchback which did not prove to be what I hoped...got rid of it a week later! Yes it will cost me a bit but I don't like to dwell on my mistakes - life is too short. 1 Quote Link to comment Share on other sites More sharing options...
spursmaddave Posted February 28, 2013 Share Posted February 28, 2013 Back for Mark @ Abbey and he thinks they sound as they should... Which means I don't like the HFC Milltek combo! I will probably go back to oem shortly so watch the for sale thread for some brand new HFCs shortly Shame you didn't come along to a meet up or find someone who had HFCs to have a listen, but anyway as Neil said life's too short to dwell on mistakes just chalk it up and move on Quote Link to comment Share on other sites More sharing options...
downhuman Posted February 28, 2013 Author Share Posted February 28, 2013 (edited) Yup Need to arrange a karting date soon - you just reminded me!! And I have HFC with Milltek on my Focus RS but it sounded awesome. Just on the 350z it isn't for me Edited February 28, 2013 by downhuman Quote Link to comment Share on other sites More sharing options...
spursmaddave Posted February 28, 2013 Share Posted February 28, 2013 Exhaust note is a very personal thing..... Karting Quote Link to comment Share on other sites More sharing options...
Tarmac@TarmacSportz Posted February 28, 2013 Share Posted February 28, 2013 Sorry you don't like these, as mentioned they were bought for Will to see if we could sort the issue on his Zorst. If you sell them and have a listen to someone else Berk/Miltek combo and you like that then I will do you a set at cost, as mentioned though the noise described is common, sounds much better on the outside, not heard Stillens in the flesh though to be fair Quote Link to comment Share on other sites More sharing options...
downhuman Posted February 28, 2013 Author Share Posted February 28, 2013 Sorry you don't like these, as mentioned they were bought for Will to see if we could sort the issue on his Zorst. If you sell them and have a listen to someone else Berk/Miltek combo and you like that then I will do you a set at cost, as mentioned though the noise described is common, sounds much better on the outside, not heard Stillens in the flesh though to be fair Not your fault at all mate! Will stick to oem cats for short term and when I have the money consider an HFC and uprev combo as mine misbehaved from a throttle response perspective too, which some HR cars do apparently . And thanks for your kind offer on the Berks Chris Quote Link to comment Share on other sites More sharing options...
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