sregorn Posted August 19, 2014 Share Posted August 19, 2014 My HR has a flat spot / hesitation when driving slowly in traffic when I come off the pedal and then go on it again . Have fitted K&N panels and cleaned the air flow sensors but it is still there any ideas guys ? Quote Link to comment Share on other sites More sharing options...
leebottrill Posted August 19, 2014 Share Posted August 19, 2014 I have the same thing I think. Is it like almost a judder of powerlessness? Quote Link to comment Share on other sites More sharing options...
marzman Posted August 19, 2014 Share Posted August 19, 2014 Does the throttle position re-learning procedure work on the HR models? May be worth a shot. Quote Link to comment Share on other sites More sharing options...
mouthwash Posted August 19, 2014 Share Posted August 19, 2014 http://www.350z-uk.com/topic/79207-2007-313-roadster/ Is that similar issue to what you're having? Quote Link to comment Share on other sites More sharing options...
Roscoe Posted August 20, 2014 Share Posted August 20, 2014 I spent a lot of time looking into this as mine had what sounds like a very similar issue to what you are experiencing when I first brought it (which is probably why the last owner sold it because not even nissan know how to work it out) It's to do with the exhaust cam timing going slightly out of its preset limits. Can be cured with an uprev remap! Contact mark at abbey motorsport. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
leebottrill Posted August 20, 2014 Share Posted August 20, 2014 I was thinking of upreving mine anyway. What are the pros and cons? I would be concerned about damaging my engine tbh! How safe are they really? Quote Link to comment Share on other sites More sharing options...
djb55 Posted August 20, 2014 Share Posted August 20, 2014 I had the same issue with my 313 HR, had the UPREV done at TDI North in Warrington. Problem solved and it makes the car more driveable, no great gains on BHP but the car feels so much better to drive. Worth every penny Quote Link to comment Share on other sites More sharing options...
leebottrill Posted August 20, 2014 Share Posted August 20, 2014 Did you have to mod anything else? Quote Link to comment Share on other sites More sharing options...
Jp606 Posted August 20, 2014 Share Posted August 20, 2014 (edited) Normal, it's the exhaust cam timing. An UpRev remap cures it, as well as making the car 100% more fun to drive. No just a software remap sorts it, no risk of engine damage or anything like that, you tend to improve the efficiency of it too. Edited August 20, 2014 by Jp606 Quote Link to comment Share on other sites More sharing options...
sregorn Posted August 20, 2014 Author Share Posted August 20, 2014 Thanks sounds like the uprev is the answer . Quote Link to comment Share on other sites More sharing options...
Ebized Posted August 20, 2014 Share Posted August 20, 2014 Just bear in mind that if you are also thinking of upgrading exhaust, air filters etc it is best to do those before the uprev otherwise you won't benefit from any gains these changes might do and might even upset the tune Quote Link to comment Share on other sites More sharing options...
Roscoe Posted August 21, 2014 Share Posted August 21, 2014 Mines standard with an uprev and still gained about 10bhp but it's not really about the gains as you will never get much even with mods. It's about how the car feels to drive after the uprev! Go for it! Definitely worth it! Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
leebottrill Posted August 21, 2014 Share Posted August 21, 2014 OK. I am going to have to replace my exhaust soon as there is a small hole in the back box which I've had welded for now. Would you say its better to change the exhaust then get the uprev? Also I'm interested. You say it improves how the car feels? In what way if power isn't really increased? Quote Link to comment Share on other sites More sharing options...
Roscoe Posted August 21, 2014 Share Posted August 21, 2014 I found after I had my uprev the engine felt much sharper, throttle response is also improved. I found before I had the uprev sometimes when pulling away the revs would sort of dive around a bit. I would say the car just feels more alive after the uprev Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
djb55 Posted August 21, 2014 Share Posted August 21, 2014 I cant remember the exact figures but the car does not get full throttle response in 1st 2nd and 3rd gear ... somebody please correct me, after the uprev its 100% through all gears Quote Link to comment Share on other sites More sharing options...
Roscoe Posted August 21, 2014 Share Posted August 21, 2014 I think it does get full throttle it just restricts the speed the throttle becomes wide open in 1st 2nd and 3rd Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
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