lusunt Posted March 10, 2015 Share Posted March 10, 2015 (edited) Hi all just seeing what people's thoughts are and what may be the cause.... I got a rb25 neo with a gt3076r.82 and I'm not getting full boost until 5500rpm...feels way too laggy for me and from my research and what other people have said it shouldn't be so laggy either. I've just brought a .63 rear housing to get better response (not fitted yet) but I feel like it shouldn't be so laggy anyway and maybe there's an underlying issue?? Setups currently making 340kw @17psi. Some of the Mods are: New neo engine Plazmaman plenum 1000cc injectors Rb26 covers -12 breathers 52mm rad 600x300x100 fmic One piece cooler pipping Fpr 6boost top mount Gt3076.82 Haltech platinum pro Edited March 10, 2015 by lusunt Link to comment https://www.sau.com.au/forums/topic/454627-rb25-neo-gt3076-issue/ Share on other sites More sharing options...
Ben C34 Posted March 10, 2015 Share Posted March 10, 2015 (edited) That's ridiculous. Check cam timing. Edited March 10, 2015 by Ben C34 Link to comment https://www.sau.com.au/forums/topic/454627-rb25-neo-gt3076-issue/#findComment-7494252 Share on other sites More sharing options...
KiwiRS4T Posted March 10, 2015 Share Posted March 10, 2015 340Kw is pretty impressive. Can you post your dyno chart(s)? Stock cams? VCT working? Link to comment https://www.sau.com.au/forums/topic/454627-rb25-neo-gt3076-issue/#findComment-7494256 Share on other sites More sharing options...
lusunt Posted March 10, 2015 Author Share Posted March 10, 2015 (edited) Yeh I havnt done any of the work myself this time....my tuner/mechanic has. Havnt got results printed or anything waiting till I'm completely happy and finished Edited March 10, 2015 by lusunt Link to comment https://www.sau.com.au/forums/topic/454627-rb25-neo-gt3076-issue/#findComment-7494257 Share on other sites More sharing options...
zebra Posted March 10, 2015 Share Posted March 10, 2015 340Kw is pretty impressive. Can you post your dyno chart(s)? Especially at 17psi Link to comment https://www.sau.com.au/forums/topic/454627-rb25-neo-gt3076-issue/#findComment-7494259 Share on other sites More sharing options...
lusunt Posted March 10, 2015 Author Share Posted March 10, 2015 (edited) Stock internals vct isn't hooked up I don't think Edited March 10, 2015 by lusunt Link to comment https://www.sau.com.au/forums/topic/454627-rb25-neo-gt3076-issue/#findComment-7494261 Share on other sites More sharing options...
lusunt Posted March 10, 2015 Author Share Posted March 10, 2015 Sorry it's only got acl bearings arp head studs? metal head gasket from memory Link to comment https://www.sau.com.au/forums/topic/454627-rb25-neo-gt3076-issue/#findComment-7494263 Share on other sites More sharing options...
zebra Posted March 10, 2015 Share Posted March 10, 2015 Stock internals vct isn't hooked up I don't think That is 90% of the problem Link to comment https://www.sau.com.au/forums/topic/454627-rb25-neo-gt3076-issue/#findComment-7494264 Share on other sites More sharing options...
lusunt Posted March 10, 2015 Author Share Posted March 10, 2015 That is 90% of the problem As in vct not hooked up? I was told it doesn't matter at all.... Link to comment https://www.sau.com.au/forums/topic/454627-rb25-neo-gt3076-issue/#findComment-7494268 Share on other sites More sharing options...
zebra Posted March 10, 2015 Share Posted March 10, 2015 Then you need to find a new mechanic/tuner 2 Link to comment https://www.sau.com.au/forums/topic/454627-rb25-neo-gt3076-issue/#findComment-7494269 Share on other sites More sharing options...
lusunt Posted March 10, 2015 Author Share Posted March 10, 2015 Can you elaborate a bit for my own knowledge cos I tried looking into that too but couldn't find anything that matched my issue..... Link to comment https://www.sau.com.au/forums/topic/454627-rb25-neo-gt3076-issue/#findComment-7494271 Share on other sites More sharing options...
Kinkstaah Posted March 10, 2015 Share Posted March 10, 2015 It matters, a lot. Not as much as you'd get this result though, there's more than just that at play.. I also vote there's some massive boost leak somewhere too, for bonus points Link to comment https://www.sau.com.au/forums/topic/454627-rb25-neo-gt3076-issue/#findComment-7494272 Share on other sites More sharing options...
lusunt Posted March 10, 2015 Author Share Posted March 10, 2015 It matters, a lot. Not as much as you'd get this result though, there's more than just that at play.. I also vote there's some massive boost leak somewhere too, for bonus points Is there something I can buy that reliably tests for boost/vacuum leaks? Link to comment https://www.sau.com.au/forums/topic/454627-rb25-neo-gt3076-issue/#findComment-7494286 Share on other sites More sharing options...
jay-rod Posted March 10, 2015 Share Posted March 10, 2015 Goto bunnings, get some pvc end caps, put a hole in it and hook up a air compressor.Pump it upto ~25 psi. Link to comment https://www.sau.com.au/forums/topic/454627-rb25-neo-gt3076-issue/#findComment-7494293 Share on other sites More sharing options...
lusunt Posted March 10, 2015 Author Share Posted March 10, 2015 Still wouldn't mind any other thoughts..... Link to comment https://www.sau.com.au/forums/topic/454627-rb25-neo-gt3076-issue/#findComment-7494321 Share on other sites More sharing options...
jay-rod Posted March 10, 2015 Share Posted March 10, 2015 (edited) Getting VCT working should be a priority, unless you don't have stock cams?I believe it will give you about 200rpm more response compared to off.I would be PM Stao from hypergear and see if he will give you some tips. The .62 housing will prob get you about another 500 rpm response.Is it running internal gate?Try pre loading the actuatorEdit, Oh yeh, a china spec 3076 will do this Edit again340 kw with a gt3076 and only 17 psi? That doesnt seem right?are you on E85? Edited March 10, 2015 by jay-rod Link to comment https://www.sau.com.au/forums/topic/454627-rb25-neo-gt3076-issue/#findComment-7494328 Share on other sites More sharing options...
KiwiRS4T Posted March 10, 2015 Share Posted March 10, 2015 I agree. Get another mechanic/ tuner. VCT changes the cam timing by... I think its 20 degrees... so you can see it's not insignificant. Link to comment https://www.sau.com.au/forums/topic/454627-rb25-neo-gt3076-issue/#findComment-7494339 Share on other sites More sharing options...
lusunt Posted March 10, 2015 Author Share Posted March 10, 2015 (edited) Getting VCT working should be a priority, unless you don't have stock cams? I believe it will give you about 200rpm more response compared to off. I would be PM Stao from hypergear and see if he will give you some tips. The .62 housing will prob get you about another 500 rpm response. Is it running internal gate? Try pre loading the actuator Edit, Oh yeh, a china spec 3076 will do this Edit again 340 kw with a gt3076 and only 17 psi? That doesnt seem right? are you on E85? Well my thoughts were that it should hit full boost at around 4000rpm 4400 at latestif vct only effects it by a couple hundred rpm then I'm not fussed about using it... Sorry it's 45mil turbosmart External gate Genuine gt3076 and yeh e85 Edited March 10, 2015 by lusunt Link to comment https://www.sau.com.au/forums/topic/454627-rb25-neo-gt3076-issue/#findComment-7494340 Share on other sites More sharing options...
jay-rod Posted March 10, 2015 Share Posted March 10, 2015 (edited) Then dont use it, but if you have a neo engine with neo cams, why the hell wouldnt you?No negatives, only positives???But yes every 3076 i see has full boost by ~4300 on a rb25Gate could be causing slow boost, do you have a dyno graph with correct scaling?Would help out most people here diagnoses issues Edited March 10, 2015 by jay-rod Link to comment https://www.sau.com.au/forums/topic/454627-rb25-neo-gt3076-issue/#findComment-7494344 Share on other sites More sharing options...
lusunt Posted March 10, 2015 Author Share Posted March 10, 2015 Very true. Seems kinda minor at this point in time though unless someone thinks otherwise.... It's just at the moment I want to focus on the main issue...getting it to come on properly.... Link to comment https://www.sau.com.au/forums/topic/454627-rb25-neo-gt3076-issue/#findComment-7494345 Share on other sites More sharing options...
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