Bellato Donating Members 2,713 Member For: 14y 3m 20d Posted 04/09/14 06:31 AM Share Posted 04/09/14 06:31 AM Just wondering how many people have put a full 4" exhaust or even just a 4" dump and 3.5" exhaust without doing the port and flapper mod?If so how well was your tuner able to control boost? Can you post your boost graphs to check out?My mate has 4" into 3.5" and with just actuator but he wanted the boost brought on hard and fast so had 17psi and it died off to 12 straight after, but I figure that is likely to be the case if you'r trying to bring a lot of boost into the factory FG turbo Link to comment Share on other sites More sharing options...
JETURBO ...JD TUNING ADELAIDE... Gold Donating Members 23,708 Member For: 16y 8m 8d Gender: Male Location: Adelaide Posted 04/09/14 08:52 AM Share Posted 04/09/14 08:52 AM Port n flap jobs are for control on small turbo fg's for lower boost applications vs big in then taper off So nil effect on your mates set up Port n flap typically is detrimental to later in the rpm for b series and just low flat desired boost on a fg small turbo Link to comment Share on other sites More sharing options...
bjc Donating Members 2,823 Member For: 21y 5m 4d Gender: Male Location: Townsville Posted 04/09/14 09:24 AM Share Posted 04/09/14 09:24 AM Little turbo just runs out of puff regardless and that's why there is only 17psi at full boost then tapering down as it runs out of flow (My F6X does the same with the small comp wheel).My BA turbo had the xforce 3.5in system with their split dump, no cat and rear muffler was also changed to a straight through type. I had all supporting mods except for the wastegate port or flapper mod (which should really have been donw but I was lazy) and the car initially went 357rwkw but boost was uncontrollable at 21-22psi in the top end so my tuner pulled it back and I settled for 18psi and with only 320rwkw though...If you have all suporting mods for 400-450rwkw then I would be swapping the comp wheel over to the larger billet type and getting the wastegate ported at the same time for boost control as it's not worth it on the little comp wheel! Link to comment Share on other sites More sharing options...
ratter Member 6,793 Member For: 18y 8m 12d Gender: Male Location: @ my laptop Posted 04/09/14 10:55 AM Share Posted 04/09/14 10:55 AM Bels g6et would have 16 psi at 0 duty cycle and 18 when we tested a turbo side intake, port job and now we can control down to around 10 psi. 1 Link to comment Share on other sites More sharing options...
MattyP MattyP Cruise Control 6,317 Member For: 12y 9m 4d Gender: Male Location: Central Coast Posted 04/09/14 12:17 PM Share Posted 04/09/14 12:17 PM My turbo had 16 tappering off to 11 with the standard turbo and 4 in to 3 1/2 dump and cat into catback with great sucess 1 Link to comment Share on other sites More sharing options...
Bellato Donating Members 2,713 Member For: 14y 3m 20d Posted 08/09/14 05:04 AM Author Share Posted 08/09/14 05:04 AM Port n flap jobs are for control on small turbo fg's for lower boost applications vs big in then taper offSo nil effect on your mates set upPort n flap typically is detrimental to later in the rpm for b series and just low flat desired boost on a fg small turboMy turbo had 16 tappering off to 11 with the standard turbo and 4 in to 3 1/2 dump and cat into catback with great success A bit of a spike and drop off doesn't worry me all that much anyway. If I could get 15-16 tapering to 12 I won't be too concerned.. Obviously controlling a flat line of boost to achieve the same result would be good, was just more concerned with how bad the boost would spike. Will be using a 12psi actuator aswell not factory so that will help fractionally. Matty what power was your car making at that point? Little turbo just runs out of puff regardless and that's why there is only 17psi at full boost then tapering down as it runs out of flow (My F6X does the same with the small comp wheel).My BA turbo had the xforce 3.5in system with their split dump, no cat and rear muffler was also changed to a straight through type. I had all supporting mods except for the wastegate port or flapper mod (which should really have been donw but I was lazy) and the car initially went 357rwkw but boost was uncontrollable at 21-22psi in the top end so my tuner pulled it back and I settled for 18psi and with only 320rwkw though...If you have all suporting mods for 400-450rwkw then I would be swapping the comp wheel over to the larger billet type and getting the wastegate ported at the same time for boost control as it's not worth it on the little comp wheel!Yea I was going to upgrade to a gtx3576 but realistically I just can't afford to break anything at the moment and not happy with my exhaust or current tune so thought I would just change those 2 things, try get over the 300rwkw hurdle and leave it until I finish uni and get a job, then reassess where to go with future mods. With the addition of this exhaust the car only needs valve springs and a good turbo to see over 400rwkw Link to comment Share on other sites More sharing options...
MattyP MattyP Cruise Control 6,317 Member For: 12y 9m 4d Gender: Male Location: Central Coast Posted 08/09/14 05:05 AM Share Posted 08/09/14 05:05 AM My car was making 357 on e85 with the standard actuator as well.I've been told that the standard actuator is enough to max out the standard turbo.The standard turbo maxed out is brilliant for a daily Link to comment Share on other sites More sharing options...
bjc Donating Members 2,823 Member For: 21y 5m 4d Gender: Male Location: Townsville Posted 08/09/14 05:51 AM Share Posted 08/09/14 05:51 AM Just change the to comp wheel to a bigger billet style like Matty and myself have done then you can have your cake and eat it on the cheap... 1 Link to comment Share on other sites More sharing options...
MattyP MattyP Cruise Control 6,317 Member For: 12y 9m 4d Gender: Male Location: Central Coast Posted 08/09/14 06:25 AM Share Posted 08/09/14 06:25 AM (edited) Yeah what bjc said You can even take the fg turbo, take off the compressor wheel and cover, fit a t04z wheel and .7 35r housing machined to accept the wheel and then go 500 on e85 Edited 08/09/14 06:26 AM by MattyP 1 Link to comment Share on other sites More sharing options...
Bellato Donating Members 2,713 Member For: 14y 3m 20d Posted 08/09/14 10:43 AM Author Share Posted 08/09/14 10:43 AM Yea I just dont want major boost spike, might need to have anothet chat to the tuner. Yea I was going to go billet wheel, then was gonna go gtx3576, but decided to hold off for the moment. Cars only making 275 and 295 on different dynos so will try go 300 on the harsher dyno Link to comment Share on other sites More sharing options...
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