FGeorge Member 79 Member For: 3y 8m 29d Posted 04/08/21 12:16 AM Share Posted 04/08/21 12:16 AM Hi everyone, A reputable tuner (not wanting to name names but comes highly recommended on the forum) has told me that with a high flow cat, 3.5inch x-force catback and antz intercooler that a tune will not stop over-boost from occuring, especially during cold nights. I'm told that the only option is to get a waste gate and turbo actuator to stop a mechanical problem from eventuating. Can anyone shed some light here? Build list: high flow cat 3.5 inch xforce catback stage 2 antz intercooler (to be fitted with piping kit) kpm1000-s walbro 460 Valve springs Head studs Billet gears oil pump Link to comment Share on other sites More sharing options...
k31th less WHY; more WOT Site Developer 29,269 Member For: 16y 10m 19d Gender: Male Location: Melbourne Posted 04/08/21 12:47 AM Share Posted 04/08/21 12:47 AM if you're not happy with what they've said and are happy with another tuner, then go with the other one. Link to comment Share on other sites More sharing options...
Panda Eyes flame magnet Gold Donating Members 5,674 Member For: 16y 9m 13d Gender: Male Location: adelaide hills- 'race air' central Posted 04/08/21 01:51 AM Share Posted 04/08/21 01:51 AM Why would you not listen to the advice of a reputable tuner? There's a reason they've got a good reputation Link to comment Share on other sites More sharing options...
FGeorge Member 79 Member For: 3y 8m 29d Posted 04/08/21 02:31 AM Author Share Posted 04/08/21 02:31 AM Reputable doesn't mean infallible, and it also means extra work for them so they possibly have an incentive to over engineer it. There's a lot of knowledge and experience here so I'm curious to get a few opinions Link to comment Share on other sites More sharing options...
biddie_fiddler [IMPULSIV3] Donating Members 1,374 Member For: 5y 11m Gender: Male Location: Perth, WA Posted 04/08/21 02:40 AM Share Posted 04/08/21 02:40 AM I mean... That sounds pretty accurate to me? Its extremely common knowledge that the stock turbo's on these cars do not work well over 16ish (numbers can vary) due to the wastegate setup not being efficient. Small wastegate port and all that. Hence the extremely common mod that is to port the wastegate and install a bigger flapper. Commonly dubbed "flapper mod". Link to comment Share on other sites More sharing options...
FGeorge Member 79 Member For: 3y 8m 29d Posted 04/08/21 03:58 AM Author Share Posted 04/08/21 03:58 AM Right, but isn't the flapper mod to get more out of the stock turbo? What if I'm happy at the 300-320 mark? Do I need to do the wastegate and flapper then? Link to comment Share on other sites More sharing options...
adams355 Member 529 Member For: 7y 10m Gender: Male Location: Brisbane Posted 04/08/21 04:06 AM Share Posted 04/08/21 04:06 AM You only need the flapper mod at lower boost levels 8-14 or so. You don't need it with anying above 16 ish but you will need an appropiate actuator at that level 10,12,14 psi spring etc. Link to comment Share on other sites More sharing options...
biddie_fiddler [IMPULSIV3] Donating Members 1,374 Member For: 5y 11m Gender: Male Location: Perth, WA Posted 04/08/21 04:08 AM Share Posted 04/08/21 04:08 AM 8 minutes ago, FGeorge said: Right, but isn't the flapper mod to get more out of the stock turbo? What if I'm happy at the 300-320 mark? Do I need to do the wastegate and flapper then? It was recommended to me to do it, and I'm in that bracket. I didn't do it and Rob tuned it accordingly. So no, not technically. But it'd definitely help 😋 Link to comment Share on other sites More sharing options...
FGeorge Member 79 Member For: 3y 8m 29d Posted 04/08/21 04:19 AM Author Share Posted 04/08/21 04:19 AM How's your car running Biddie_fiddler? Any overboost issues on cold winter nights? 12 minutes ago, adams355 said: You only need the flapper mod at lower boost levels 8-14 or so. You don't need it with anying above 16 ish but you will need an appropiate actuator at that level 10,12,14 psi spring etc. So I'll get it tuned to exactly 15 PSI and I'll be right, yeah? haha Link to comment Share on other sites More sharing options...
biddie_fiddler [IMPULSIV3] Donating Members 1,374 Member For: 5y 11m Gender: Male Location: Perth, WA Posted 04/08/21 05:03 AM Share Posted 04/08/21 05:03 AM I've hit upwards of 18psi on more than one occasion.... So if I was to do it again I'd do the flapper mod 😅 Max I've recorded is 21psi Its tuned to 16psi Link to comment Share on other sites More sharing options...
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