Piggaz Posted April 18, 2013 Share Posted April 18, 2013 Other thing is the turbos are REALLY laggy. I get 18psi by 6000rpm and power drops off completely at 22psi at 7500rpm so theres no point revving past there... Has it been tuned? If it has I'd be finding someone else to tune it. Link to comment https://www.sau.com.au/forums/topic/254450-79s-or-5s-garretts/page/28/#findComment-6820144 Share on other sites More sharing options...
Marko R1 Posted April 18, 2013 Share Posted April 18, 2013 Has it been tuned? If it has I'd be finding someone else to tune it. I think this is your issue as well. Is the engine healthy i.e. done a compression test as this could be the source as well? Your tuner should have diagnosed if there was an issue from the onset. Link to comment https://www.sau.com.au/forums/topic/254450-79s-or-5s-garretts/page/28/#findComment-6820158 Share on other sites More sharing options...
TheGeniusMoose Posted April 18, 2013 Share Posted April 18, 2013 It's been tuned multiple times by the same workshop and they just say its a low reading dyno... Link to comment https://www.sau.com.au/forums/topic/254450-79s-or-5s-garretts/page/28/#findComment-6820177 Share on other sites More sharing options...
(OO)SKYLINE(OO) Posted April 18, 2013 Share Posted April 18, 2013 That's the plan when I think I need more power. One day... The urge for more power will get to you 1 Link to comment https://www.sau.com.au/forums/topic/254450-79s-or-5s-garretts/page/28/#findComment-6820188 Share on other sites More sharing options...
Piggaz Posted April 18, 2013 Share Posted April 18, 2013 It's been tuned multiple times by the same workshop and they just say its a low reading dyno... It can be low reading all it likes. 18 psi at 6000 rpm then falls over at 7500 is the issue. Link to comment https://www.sau.com.au/forums/topic/254450-79s-or-5s-garretts/page/28/#findComment-6820204 Share on other sites More sharing options...
levinboy Posted April 18, 2013 Share Posted April 18, 2013 Ethanol Content Sensor. Next excuse!!! No money for everything I want to use Check mate Link to comment https://www.sau.com.au/forums/topic/254450-79s-or-5s-garretts/page/28/#findComment-6820206 Share on other sites More sharing options...
TheGeniusMoose Posted April 18, 2013 Share Posted April 18, 2013 (edited) It can be low reading all it likes. 18 psi at 6000 rpm then falls over at 7500 is the issue. This is the dyno chart. If you could interperet it that would be great. Sorry its not in RPM. If it helps, I've got an RB25 box and 4.08 gears. Edited April 18, 2013 by TheGeniusMoose Link to comment https://www.sau.com.au/forums/topic/254450-79s-or-5s-garretts/page/28/#findComment-6820212 Share on other sites More sharing options...
Piggaz Posted April 18, 2013 Share Posted April 18, 2013 What turbos are they? What's the rest of the setup? Link to comment https://www.sau.com.au/forums/topic/254450-79s-or-5s-garretts/page/28/#findComment-6820295 Share on other sites More sharing options...
TheGeniusMoose Posted April 18, 2013 Share Posted April 18, 2013 (edited) R33GTR motor. 155PSI compression on all 6 2860-5 turbos 255L walbro pump Nismo 600CC injectors RB25 box and 3.08 diff gears Coppermix clutch STD r33 GTR FMIC piping Power FC D Jectro Greddy Profec B 8psi actuators Is that what you need to know? What turbos are they?What's the rest of the setup? Edited April 18, 2013 by TheGeniusMoose Link to comment https://www.sau.com.au/forums/topic/254450-79s-or-5s-garretts/page/28/#findComment-6820342 Share on other sites More sharing options...
MrStabby Posted April 18, 2013 Share Posted April 18, 2013 R33GTR motor. 155PSI compression on all 6 2860-5 turbos 255L walbro pump Nismo 600CC injectors RB25 box and 3.08 diff gears Coppermix clutch STD r33 GTR FMIC piping Power FC D Jectro Greddy Profec B 8psi actuators Is that what you need to know? Also need exhaust details. You should have minimum 3.5in with metallic matrix cat. Take a look at the RB26 sticky to see what you should be getting - something is seriously wrong with your result. Injectors might run out of puff if they're not clean. Link to comment https://www.sau.com.au/forums/topic/254450-79s-or-5s-garretts/page/28/#findComment-6820390 Share on other sites More sharing options...
TheGeniusMoose Posted April 18, 2013 Share Posted April 18, 2013 Twin 3" dumps into a 3.5 decat and 3" cat back Also need exhaust details. You should have minimum 3.5in with metallic matrix cat. Take a look at the RB26 sticky to see what you should be getting - something is seriously wrong with your result. Injectors might run out of puff if they're not clean. Link to comment https://www.sau.com.au/forums/topic/254450-79s-or-5s-garretts/page/28/#findComment-6820772 Share on other sites More sharing options...
(OO)SKYLINE(OO) Posted April 19, 2013 Share Posted April 19, 2013 Will Adjustable Cam Gears help tweak the power up a bit? Link to comment https://www.sau.com.au/forums/topic/254450-79s-or-5s-garretts/page/28/#findComment-6820978 Share on other sites More sharing options...
TheGeniusMoose Posted April 19, 2013 Share Posted April 19, 2013 I'd have thought cam gears wind a bit more response in and not a whole heap of power. Regardless... something in my current setup is very wrong without buying new stuff I think. Link to comment https://www.sau.com.au/forums/topic/254450-79s-or-5s-garretts/page/28/#findComment-6821006 Share on other sites More sharing options...
Piggaz Posted April 19, 2013 Share Posted April 19, 2013 I'd have thought cam gears wind a bit more response in and not a whole heap of power. Regardless... something in my current setup is very wrong without buying new stuff I think. Depends which way you turn the gears. Link to comment https://www.sau.com.au/forums/topic/254450-79s-or-5s-garretts/page/28/#findComment-6821018 Share on other sites More sharing options...
Ants Posted April 19, 2013 Share Posted April 19, 2013 Here is a question for you rev heads. My build comprises of the following: Tomei Advance Spec RB26 (long engine) spec are here http://www.tomeipowered.com/BTE/index.php/2011/04/28/rb26-complete-engine-advanced-spec/ Garrett 2860R -5s (ex. housings lightly ported) HKS actuators (set at 1 bar each) OEM ex. Manifolds (ported) Mines dump Pipes (Pipe diameter: 70φ) Midori Ti front pipes (80φ diameter) Catco Race Cat (3' diameter) Tomei Ti Expreme cat back exhaust (3.5' diameter) HKS fuel rail HKS 1,000cc injectors Tomei fuel pressure regulator SARD Intank Fuel Pump (280ltr p/h) (in bold because I believe this will be a weak point) Nismo Plenum Cooling Pro I/C (100mm) Apexi Power FC + HC To be tuned on E85 Boost say 20psi What power do you think I should make? and do you think that choice of -5s is appropriate? Link to comment https://www.sau.com.au/forums/topic/254450-79s-or-5s-garretts/page/28/#findComment-6821071 Share on other sites More sharing options...
gtr jet Posted April 19, 2013 Share Posted April 19, 2013 370kw as a rough guess. The fuel pump will run out 1st. Depends what you want to use the car for. If you don't mind the extra lag over -7's or -9's then they'll be fine. Link to comment https://www.sau.com.au/forums/topic/254450-79s-or-5s-garretts/page/28/#findComment-6821083 Share on other sites More sharing options...
(OO)SKYLINE(OO) Posted April 19, 2013 Share Posted April 19, 2013 ^^ Yeah!I believe -5's on a fully built forged RB26, you would see that, if not a tad more... Link to comment https://www.sau.com.au/forums/topic/254450-79s-or-5s-garretts/page/28/#findComment-6821099 Share on other sites More sharing options...
Piggaz Posted April 19, 2013 Share Posted April 19, 2013 Why have a 3 inch cat ? Make it the same size as your catback. Link to comment https://www.sau.com.au/forums/topic/254450-79s-or-5s-garretts/page/28/#findComment-6821180 Share on other sites More sharing options...
Piggaz Posted April 19, 2013 Share Posted April 19, 2013 And why only 20 psi. IIRC, those Tomei engines are 8:5:1 (correct me if I'm wrong). 24 on pump fuel! Link to comment https://www.sau.com.au/forums/topic/254450-79s-or-5s-garretts/page/28/#findComment-6821185 Share on other sites More sharing options...
Ants Posted April 19, 2013 Share Posted April 19, 2013 (edited) Why have a 3 inch cat ? Make it the same size as your catback. I thought that would be restriction....where can I get a 3.5in cat back from? And why only 20 psi. IIRC, those Tomei engines are 8:5:1 (correct me if I'm wrong). 24 on pump fuel! 20psi was just an estimate Advance spec is 8:4:1 (same as Tomei 2.8 Genesis) if that changes anything??? Edited April 19, 2013 by Ants Link to comment https://www.sau.com.au/forums/topic/254450-79s-or-5s-garretts/page/28/#findComment-6821195 Share on other sites More sharing options...
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