Y23DRH Posted July 15, 2013 Share Posted July 15, 2013 (edited) I have had my 2005 350z roadster almost a year and still most i see is 20.7mpg on motorway and 19.6 around town and thats driving sensible but my car has a few upgrades Custom Remapped by jez @ horsham devlopments Full exhaust system with no restrictions and centre bit cut out and straight pipe fitted Decatted Megan racing tubular manifold Paddle clutch Horsham developments 5/16th plenum spacer Lightened fly wheel Short shifter fitted And blitz lm induction kit with decent heat shield Plus many more mods but none that would cause the car to drink fuel :/ then i spoke to some one who has a super charged 350z and he gets around 20mpg :/ how can i be getting 20mpg been told I should get 27 to 30mpg ??? Nit sure if thats correct but almost every one i have spoke to says must be something wrong :/ I have been to nissan had the car fully serviced and checked over they said everything is ok :/ The car is not over fuelling or running rich I'm at a loss to what it could be I only use shell v power aswell Any suggestions would be very appreciated Many thanks dan Edited July 15, 2013 by F4ABP Quote Link to comment Share on other sites More sharing options...
370Ad Posted July 15, 2013 Share Posted July 15, 2013 You should easily be able to get 35mpg cruising at 70 on the motorway. If something was wrong with the engine wouldn't Jez have picked this up? It also made good power too if I recall?' 1 Quote Link to comment Share on other sites More sharing options...
Y23DRH Posted July 15, 2013 Author Share Posted July 15, 2013 You should easily be able to get 35mpg cruising at 70 on the motorway. If something was wrong with the engine wouldn't Jez have picked this up? It also made good power too if I recall?' Yea the car made very good power and the torque curve was very good aswell jez run it 12 times on the dyno with no problems at all :/ The car has been fully health checked etc all came back ok ??? Quote Link to comment Share on other sites More sharing options...
Y23DRH Posted July 15, 2013 Author Share Posted July 15, 2013 I just cant seem to find what the problem could be or if there is one at all ???? Quote Link to comment Share on other sites More sharing options...
M13KYF Posted July 15, 2013 Share Posted July 15, 2013 best place to start is to go back to Jez and get the map checked. You should be getting better mpg. Either that or have you tried 5th and 6th gear on the motorway 1 Quote Link to comment Share on other sites More sharing options...
Y23DRH Posted July 15, 2013 Author Share Posted July 15, 2013 best place to start is to go back to Jez and get the map checked. You should be getting better mpg. Either that or have you tried 5th and 6th gear on the motorway Yea i will go back to jez get him to check it all over And yep tried every thing i can to see if i can get it to be better on fuel :/ Quote Link to comment Share on other sites More sharing options...
Lincolnbaggie Posted July 15, 2013 Share Posted July 15, 2013 How are you measuring the mpg? Quote Link to comment Share on other sites More sharing options...
M13KYF Posted July 15, 2013 Share Posted July 15, 2013 I was joking about the gears 1 Quote Link to comment Share on other sites More sharing options...
M13KYF Posted July 15, 2013 Share Posted July 15, 2013 How are you measuring the mpg? good point Have you reset the counter whilst on the motorway Quote Link to comment Share on other sites More sharing options...
Lincolnbaggie Posted July 15, 2013 Share Posted July 15, 2013 The computer is not very accurate. Mine always shows DTE of 0 when there is at least 150 miles left in the tank. How many miles do you get between fill ups and how much fuel does it take to fill up? Quote Link to comment Share on other sites More sharing options...
Y23DRH Posted July 15, 2013 Author Share Posted July 15, 2013 I was measuring the mpg off the computer but i have also kept a log of total miles on the trip computer Aswel i zero back setting a and b every time i fill up but when come to next fill up lucky if i get 240 miles from a tank :/ Quote Link to comment Share on other sites More sharing options...
Y23DRH Posted July 15, 2013 Author Share Posted July 15, 2013 I takes just over £100 to fill up and i get 240 miles from it :/ Quote Link to comment Share on other sites More sharing options...
bamdc2 Posted July 15, 2013 Share Posted July 15, 2013 hmmm does seem a little low even with all those upgrades. Jez would surely know if there were any fueling issues. I consistently get 22/23mpg around town but I havent specifically reset the mpg for a long run. Definately get more than 20.7 though! Must be the way its mapped? Quote Link to comment Share on other sites More sharing options...
Aliensurfer Posted July 15, 2013 Share Posted July 15, 2013 Small fuel leak somewhere maybe? Quote Link to comment Share on other sites More sharing options...
Lincolnbaggie Posted July 15, 2013 Share Posted July 15, 2013 (edited) I takes just over £100 to fill up and i get 240 miles from it :/ Ouch, that does sound low. I assume no leaks? Oops, beaten to it Edited July 15, 2013 by Lincolnbaggie Quote Link to comment Share on other sites More sharing options...
squanchy Posted July 15, 2013 Share Posted July 15, 2013 Wait a minute, I rarely get more than 16mpg around town... I just assumed this was normal. Quote Link to comment Share on other sites More sharing options...
M13KYF Posted July 15, 2013 Share Posted July 15, 2013 Wait a minute, I rarely get more than 16mpg around town... I just assumed this was normal. its on the motorway the OP has the issue Quote Link to comment Share on other sites More sharing options...
NeilMH Posted July 15, 2013 Share Posted July 15, 2013 Presume the re-map was done after the mods? Quote Link to comment Share on other sites More sharing options...
Y23DRH Posted July 15, 2013 Author Share Posted July 15, 2013 No fuel leaks that i can or smell and nothing on the floor when i leave the car for the day in once space either i have also had nissan check the car over and they said they couldn't find any thing wrong :/ Quote Link to comment Share on other sites More sharing options...
Y23DRH Posted July 15, 2013 Author Share Posted July 15, 2013 Presume the re-map was done after the mods? Yep all mods added then went for a remap Quote Link to comment Share on other sites More sharing options...
Lincolnbaggie Posted July 15, 2013 Share Posted July 15, 2013 You say its got a paddle clutch? Assume an auto then. Is it sitting in the correct gear? Quote Link to comment Share on other sites More sharing options...
Y23DRH Posted July 15, 2013 Author Share Posted July 15, 2013 I will reset every thing on next fill up and see what the results i get And i will check under the car make sure none the fuel hoses are leaking or weeping and also check the fuel pump and tank for leaks but if it is leaking its not detectable at all :/ Its had new spark plugs correctly gapped New fuel and oil filter Among lots of other bits And also new coil packs to see if that would sort it but still nothing :/ Quote Link to comment Share on other sites More sharing options...
Y23DRH Posted July 15, 2013 Author Share Posted July 15, 2013 You say its got a paddle clutch? Assume an auto then. Is it sitting in the correct gear? No its a manual 6 speed gt roadster Has a very heavy clutch its either on or off no in between Im really at a loss to what the problem could be Quote Link to comment Share on other sites More sharing options...
jjt Posted July 15, 2013 Share Posted July 15, 2013 The mpg does vary massively depending on whether its around town or on a run. On a run its around 34mpg, but around town about 21. Id say if all I do to a tank is urban driving, I would get about 260 miles out of the £80 tank, up to 360+ on a run. Quote Link to comment Share on other sites More sharing options...
Y23DRH Posted July 15, 2013 Author Share Posted July 15, 2013 The mpg does vary massively depending on whether its around town or on a run. On a run its around 34mpg, but around town about 21. Id say if all I do to a tank is urban driving, I would get about 260 miles out of the £80 tank, up to 360+ on a run. I get 20.7 mpg on motorway i should be getting 35mpg ??? So something must be wrong then ??? Quote Link to comment Share on other sites More sharing options...
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