Guest Niklas Posted September 6, 2009 Share Posted September 6, 2009 (edited) Hi . We had some problems with my supra mkiv this weekend when i was on dyno with it. Mods on it bl t67dbb + aem ems + sard 800cc + 2 fuelpumps + hks ssqv + hks dli When it hit max boost( 1.4 bar ) at 4000rpm then the graph power and torque leans out. You can see it on graph. Have someone some ideas what is wrong?? coils?? niklas finland Edited September 7, 2009 by Niklas (see edit history) Quote Link to comment Share on other sites More sharing options...
michel lane Posted September 6, 2009 Share Posted September 6, 2009 Has the car been correctly setup ? 1: additional fuel pumps 2: FPR 3: Is the car running 02 feedback on the ECU ? who tuned it for you ? sounds like a fueling issue you have. are the injectors direct drop in or aftermarket rail ? Quote Link to comment Share on other sites More sharing options...
dude Posted September 7, 2009 Share Posted September 7, 2009 Sounds like the fuel pressure reg is either plumbed wrong or you do not have a vac hose connected so the pressure is not rising on boost, make sure you have a guage on it and watch to see if the pressure goes up as it comes on boost. Quote Link to comment Share on other sites More sharing options...
Guest Niklas Posted September 7, 2009 Share Posted September 7, 2009 I have orginal fpr and orginal fuelrail with 800cc drop ins. The fueling is not the problem.. the afr was very good .. Quote Link to comment Share on other sites More sharing options...
dude Posted September 7, 2009 Share Posted September 7, 2009 When you say the car leans out to us that means it is running lean, do you mean the power tails off. Quote Link to comment Share on other sites More sharing options...
dude Posted September 7, 2009 Share Posted September 7, 2009 Is it holding 1.4 bar all the time or is it losing boost Quote Link to comment Share on other sites More sharing options...
dude Posted September 7, 2009 Share Posted September 7, 2009 I would say the turbo and cams are running out of puff at higher revs. Quote Link to comment Share on other sites More sharing options...
michel lane Posted September 7, 2009 Share Posted September 7, 2009 if thats the case , its most likely what Dude has suggested, i would say its the turbo, its most likely running a .68ar exhaust housing thats why its begining to choke at 6000rpm Quote Link to comment Share on other sites More sharing options...
michel lane Posted September 7, 2009 Share Posted September 7, 2009 is that showing your torque figures are substantially larger then your HP figures, or am i reading it wrong here. show us some light. It looks like your hp figure are 580hp at max, that seems right for 1.4 bar. Quote Link to comment Share on other sites More sharing options...
Guest Niklas Posted September 7, 2009 Share Posted September 7, 2009 (edited) turbo is holding 1,4 bar the hole run. no problems . but if you are looking att the dyno chart att 4000rpm. At the same time the turbo has got 1,4bar. Why does it not follow a smooth line?? can it be the ignition coils or some poor ground?? Edited September 7, 2009 by Niklas (see edit history) Quote Link to comment Share on other sites More sharing options...
Guest Niklas Posted September 7, 2009 Share Posted September 7, 2009 no the max power was 515hp and 600nm Quote Link to comment Share on other sites More sharing options...
Guest Niklas Posted September 7, 2009 Share Posted September 7, 2009 I would say the turbo and cams are running out of puff at higher revs. at the high revs is not a problem...but at 4000rpm when i got full boost 1,4bar....why does the chart change direction...if you understand what i mean Quote Link to comment Share on other sites More sharing options...
michel lane Posted September 7, 2009 Share Posted September 7, 2009 i dont know what you are talking about ? the graph looks fine ....just out of curiousity do you know what you are looking at ? and do you know how to read a dyno graph ? maybe you lack the understanding of a dyno chart. please explain what you imagine or how you imagine the graph to look like. Quote Link to comment Share on other sites More sharing options...
Guest Niklas Posted September 8, 2009 Share Posted September 8, 2009 has someone some ideas?? or is the maxboost too low...how high ? i thought i have nearer 600hp in engine ..but not on what boost are you driving? Quote Link to comment Share on other sites More sharing options...
dude Posted September 8, 2009 Share Posted September 8, 2009 What cams do you have??? Quote Link to comment Share on other sites More sharing options...
Guest Niklas Posted September 8, 2009 Share Posted September 8, 2009 stock jspec cams Quote Link to comment Share on other sites More sharing options...
Stephendjb Posted September 8, 2009 Share Posted September 8, 2009 I can't see anything wrong change the cams it'd make more power & be more of a curve than a straight lineat the top of the rev range Quote Link to comment Share on other sites More sharing options...
Ian C Posted September 10, 2009 Share Posted September 10, 2009 i dont know what you are talking about ? the graph looks fine ....just out of curiousity do you know what you are looking at ? and do you know how to read a dyno graph ? maybe you lack the understanding of a dyno chart. please explain what you imagine or how you imagine the graph to look like. Yeah, that. I looked at this graph and unless I'm really missing something, the AFRs are rock steady? Quote Link to comment Share on other sites More sharing options...
Ian C Posted September 10, 2009 Share Posted September 10, 2009 stock jspec cams That'll choke your power at 6000rpm+ waaaay before it's the exhaust housing on the turbo. -Ian Quote Link to comment Share on other sites More sharing options...
Guest Niklas Posted September 10, 2009 Share Posted September 10, 2009 That'll choke your power at 6000rpm+ waaaay before it's the exhaust housing on the turbo. -Ian ok...what cams you recomend? how much better is the euro/ us cams? niklas Quote Link to comment Share on other sites More sharing options...
Ian C Posted September 10, 2009 Share Posted September 10, 2009 ok...what cams you recomend? how much better is the euro/ us cams? niklas One is exactly the same, the other is too small a difference to be worth it. 256in 264ex or 264in 264ex are very favoured combinations over here. -Ian Quote Link to comment Share on other sites More sharing options...
Guest Niklas Posted September 10, 2009 Share Posted September 10, 2009 That'll choke your power at 6000rpm+ waaaay before it's the exhaust housing on the turbo. -Ian One is exactly the same, the other is too small a difference to be worth it. 256in 264ex or 264in 264ex are very favoured combinations over here. -Ian ok good to know...cam change this winter then . You got nice specs anf power in your car...i thought i have about same power in my car also... yes the afr was very good the hole run on my car. So there is no problems.... can it be the cams which do so much in power result?? niklas Quote Link to comment Share on other sites More sharing options...
Ian C Posted September 10, 2009 Share Posted September 10, 2009 ok good to know...cam change this winter then . You got nice specs anf power in your car...i thought i have about same power in my car also... yes the afr was very good the hole run on my car. So there is no problems.... can it be the cams which do so much in power result?? niklas Thank you Right I think I see what you are referring to now. The power builds up initially and then at 4000rpm it continues to rise but at a slower rate. If you look at the boost pressure, you'll see it does the same thing. The initial fast buildup of power is the turbo coming on boost - as the turbo adds more and more compressed air, the power increases rapidly. Once it reaches target boost, the power only continues to increase as a function of the revs getting higher. That increase in power isn't as big as a turbo coming on boost. Torque will start to tail off after 5757 rpm (I think it's that?) because of the way BHP is worked out mathematically from torque - a search should provide a far better explanation than that. And power stops climbing and begins to tail off probably because of the stock cams. Looks like a good clean graph. Don't get too hung up on the numbers, that can vary from dyno to dyno. -Ian Quote Link to comment Share on other sites More sharing options...
Guest Niklas Posted September 10, 2009 Share Posted September 10, 2009 Thank you Right I think I see what you are referring to now. The power builds up initially and then at 4000rpm it continues to rise but at a slower rate. If you look at the boost pressure, you'll see it does the same thing. The initial fast buildup of power is the turbo coming on boost - as the turbo adds more and more compressed air, the power increases rapidly. Once it reaches target boost, the power only continues to increase as a function of the revs getting higher. That increase in power isn't as big as a turbo coming on boost. Torque will start to tail off after 5757 rpm (I think it's that?) because of the way BHP is worked out mathematically from torque - a search should provide a far better explanation than that. And power stops climbing and begins to tail off probably because of the stock cams. Looks like a good clean graph. Don't get too hung up on the numbers, that can vary from dyno to dyno. -Ian thanks [GRIN][/GRIN] thats good info... Quote Link to comment Share on other sites More sharing options...
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