AaronC350z Posted March 15, 2014 Share Posted March 15, 2014 Hello All, I need some advice...Put my 2003 350z (40,000 miles on the clock) jap import on the dyno today and to be honest the results were that poor I just wanted to hang my head in shame ! the car made 249.5 bhp at the fly and 215.5 at the wheels ! Does anybody know what could be causing such poor performance... advice appreciated thanks regards Aaron Quote Link to comment Share on other sites More sharing options...
Neilp Posted March 15, 2014 Share Posted March 15, 2014 Who's dyno was it? There's a lot of factors outwith the car that can give poor results Quote Link to comment Share on other sites More sharing options...
mattross1313 Posted March 15, 2014 Share Posted March 15, 2014 Fuel can usually make a massive difference, what did you have in the tank? Quote Link to comment Share on other sites More sharing options...
AaronC350z Posted March 15, 2014 Author Share Posted March 15, 2014 wallace performance in aberdeen and i was running momentum and then before the run i topped it up with vpower Quote Link to comment Share on other sites More sharing options...
A9H-RX Posted March 15, 2014 Share Posted March 15, 2014 What mods you got on the car? You burning a lot of oil? Quote Link to comment Share on other sites More sharing options...
Ekona Posted March 15, 2014 Share Posted March 15, 2014 Does it feel slow? Any other issues? If not, then don't worry about the numbers. They don't mean much unless you're doing comparison runs between mods, and then only really on the same day. You can rig a dyno to read any numbers you want. Quote Link to comment Share on other sites More sharing options...
imhereithink85 Posted March 15, 2014 Share Posted March 15, 2014 I have had my car on Wallaces dyno three times now and they have been very consistant. This years was almost exactly the same as last year, the graphs overlayed very nicely. Forgot to ask you when your last service was and which one was it? Quote Link to comment Share on other sites More sharing options...
Ekona Posted March 15, 2014 Share Posted March 15, 2014 That's all you need, consistency. Ignore the actual numbers, just look at the number changes. Quote Link to comment Share on other sites More sharing options...
GMballistic Posted March 15, 2014 Share Posted March 15, 2014 What mods you got on the car? You burning a lot of oil? This. If it's a standard 2003 car then it is totally possible that it could have lost 30bhp over the years. Especially true if it hasn't been serviced that well. Have you had the plugs changed at all? I know that's not going to lose you 30bhp just wondered though. Quote Link to comment Share on other sites More sharing options...
Neilp Posted March 15, 2014 Share Posted March 15, 2014 Wallace performance know their stuff to be honest. Quote Link to comment Share on other sites More sharing options...
flyboy Posted March 15, 2014 Share Posted March 15, 2014 About 10% down in 10 years. 1% per year....... Losing that is not to bad. Especially as its an import so may have done many many more miles before it escaped Japan. 1 Quote Link to comment Share on other sites More sharing options...
JEMAN Posted March 15, 2014 Share Posted March 15, 2014 Mines 2003 and to be honest.....it still feels rapid ! I've never had it on the Dyno, but as long as I'm happy with it I won't Quote Link to comment Share on other sites More sharing options...
rtbiscuit Posted March 15, 2014 Share Posted March 15, 2014 Early cars were 276 BHP, but it was found many years ago a lot of them never made those figures even when new. Several members found many years ago that the cars could be down as much as 30 BHP. All depended on the engine. Some made the figures others didn't. Dino figures are only good for base lines for nodding and testing, or pub willy waving. 1 Quote Link to comment Share on other sites More sharing options...
KyleR Posted March 15, 2014 Share Posted March 15, 2014 Dino figures are only good for base lines for nodding and testing, or pub willy waving. A Jurassic statement, but very true 5 Quote Link to comment Share on other sites More sharing options...
Ekona Posted March 15, 2014 Share Posted March 15, 2014 Oh man, that joke is prehistoric! 1 Quote Link to comment Share on other sites More sharing options...
JB-UK Posted March 15, 2014 Share Posted March 15, 2014 Pre map, bone stock mine had 252 bhp. 2003/52 JDM import so you're not the only one! 73k miles at the time, on momentum 99. Once all the bits and bobs were added, up to 280bhp following remap. 1 Quote Link to comment Share on other sites More sharing options...
evilscorp Posted March 16, 2014 Share Posted March 16, 2014 JB-uk snap ,after mods mine made 280bhp or around 230 fly hp so don't worry just b happy with what you have, better than the route I chose. . . . 1 Quote Link to comment Share on other sites More sharing options...
Pete87 Posted March 16, 2014 Share Posted March 16, 2014 We went to a rolling road day last month and that was around the average so I wouldn't be to worried mine only made 225.2bhp and I've got full exhaust system, air filter and plenum spacer. I wouldn't worrie to much about the numbers more that the air fuel mix is good. 1 Quote Link to comment Share on other sites More sharing options...
Mark@Abbey m/s Posted March 16, 2014 Share Posted March 16, 2014 How many pulls did the guys @ Wallace do? These cars need 5 and 6 pulls to settle down to give a reasonable output figure. Also ECU reset will help. 2 Quote Link to comment Share on other sites More sharing options...
rtbiscuit Posted March 16, 2014 Share Posted March 16, 2014 How many pulls did the guys @ Wallace do? These cars need 5 and 6 pulls to settle down to give a reasonable output figure. Also ECU reset will help. does resetting the ECU only lead to an inaccurate reading as the results although positive, are only temporary as the ECU relearns the driving style and then settles back to what it was pre reset? Not sure the time period to return to previous though. Quote Link to comment Share on other sites More sharing options...
Rock_Steady Posted March 17, 2014 Share Posted March 17, 2014 i'd've thought the main reason why any car loses that kind of power is due to less compression than when it rolled off the production line. Not soley on that basis but that, and a mix of poor servicing by the previous owner perhaps. Plus, like others have said, who knows what power it was making from the get go. Quote Link to comment Share on other sites More sharing options...
zxrob Posted March 17, 2014 Share Posted March 17, 2014 Surely the only way to know what power it has lost was to bang it on the dyno from new to give a comparison If cars are anything like bikes, the manufacturers tend to slightly over exaggerate power Rob Quote Link to comment Share on other sites More sharing options...
rtbiscuit Posted March 17, 2014 Share Posted March 17, 2014 It would have been missing from the get go. Nissan was very optimistic. Some made the grade lots didn't. Quote Link to comment Share on other sites More sharing options...
AaronC350z Posted March 17, 2014 Author Share Posted March 17, 2014 ah right cheers for all your info guys and what im reading makes sense ! the car has no clunks bangs moans and runs sweet as a nut and tbh when driving it i wouldn't of known it was down on power until it hit the dyno at which point i was like ohhh..... and scratched my head at the figures but reading what yous are posting makes sense.. im booking the car in for a p3 service and then have plans just the normal ones to start exhaust plenum spacer, hfc / decat and up rev map... maybe in time super charger... haha cheers for the advice though ! didnt realise id get a good response like this ! very helpful indeed ! 1 Quote Link to comment Share on other sites More sharing options...
GMballistic Posted March 17, 2014 Share Posted March 17, 2014 ah right cheers for all your info guys and what im reading makes sense ! the car has no clunks bangs moans and runs sweet as a nut and tbh when driving it i wouldn't of known it was down on power until it hit the dyno at which point i was like ohhh..... and scratched my head at the figures but reading what yous are posting makes sense.. im booking the car in for a p3 service and then have plans just the normal ones to start exhaust plenum spacer, hfc / decat and up rev map... maybe in time super charger... haha cheers for the advice though ! didnt realise id get a good response like this ! very helpful indeed ! You should see a good improvement with those plans and definitely a much more lively Zed after the UpRev. Although Supercharger is definitely the best idea. 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.