patrol_maverick Member 54 Member For: 12y 8m 3d Gender: Male Location: Taree NSW Posted 31/03/14 11:41 PM Share Posted 31/03/14 11:41 PM I'm putting a BA Barra turbo into a Nissan Patrol. I have a factory FG manifold and dump pipe fitted, and will have a 3 inch exhaust fitted which wraps around under the sump, then will run down the passengers side of the car.My concern is, if I have a free flowing muffler and no cat, am I going to have turbo overspeed/ overboost issues? I don't really want to throw more money at it and get the gate ported. Should I expect to have issues with it before/ after I get it tuned? I'm not chasing huge power, it's a Patrol, not a drag car **My apologies if this is in the wrong section. I wasn't sure if this should be in the turbo or exhaust section. Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,331 Member For: 19y 5m 8d Gender: Male Location: Perth Posted 01/04/14 12:49 AM Share Posted 01/04/14 12:49 AM More than likely you will have issues Link to comment Share on other sites More sharing options...
ratter Member 6,793 Member For: 18y 9m 4d Gender: Male Location: @ my laptop Posted 01/04/14 02:26 AM Share Posted 01/04/14 02:26 AM overboost depends mainly on what your target boost level is, if you want to run 12 psi and can get 12 psi with some control over it, it is fine, but aiming for 12 and having 14 at 0 duty cycle is really an overboost situation and will be worse with cold air, but there are many cars running around like this and they just claim that's how it's tuned for 1 Link to comment Share on other sites More sharing options...
patrol_maverick Member 54 Member For: 12y 8m 3d Gender: Male Location: Taree NSW Posted 01/04/14 10:45 AM Author Share Posted 01/04/14 10:45 AM More than likely you will have issuesCan you elaborate a bit more?If I were to get it tuned at 10psi, it should stay pretty stable shouldn't it?Can't excessive exhaust flow/ lack of back pressure cause boost spikes? I thought that was the reason for porting the waste gate- to better balance the flow between the gate and turbine. Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,331 Member For: 19y 5m 8d Gender: Male Location: Perth Posted 01/04/14 11:13 AM Share Posted 01/04/14 11:13 AM Your likely to have boost control issues with no cat. The stock Ford intake and exhaust until used back pressure in the exhaust to prevent boost spikes/creep with the small stock gate. I think your exhaust will be free flowing enough to cause issues. In all seriousness if your skills enough to carry out the engine install your skills enough to have a crack at porting the turbo. There's plenty of info on this site and on the net to guide you. Link to comment Share on other sites More sharing options...
JVK Silver Donating Members 751 Member For: 19y 2m 13d Gender: Male Location: North West Hot Hell,VIC Posted 01/04/14 07:57 PM Share Posted 01/04/14 07:57 PM Ralph is right about porting the turbo yourself , but if you are not chasing big power why not just put in the std cat and not worry about over boost . Link to comment Share on other sites More sharing options...
patrol_maverick Member 54 Member For: 12y 8m 3d Gender: Male Location: Taree NSW Posted 04/04/14 02:37 AM Author Share Posted 04/04/14 02:37 AM Yeah maybe you're right, I might just use the standard cat and play it safe. I'll check out the porting too. I was assuming it was a specialist job. Link to comment Share on other sites More sharing options...
ratter Member 6,793 Member For: 18y 9m 4d Gender: Male Location: @ my laptop Posted 04/04/14 04:10 AM Share Posted 04/04/14 04:10 AM Almost anyone can do the port.how well?have seen some jobs from specialist that did not work very well when combined with free flowing intake and exhaust Link to comment Share on other sites More sharing options...
patrol_maverick Member 54 Member For: 12y 8m 3d Gender: Male Location: Taree NSW Posted 04/04/14 07:25 AM Author Share Posted 04/04/14 07:25 AM Almost anyone can do the port.how well?have seen some jobs from specialist that did not work very well when combined with free flowing intake and exhaustWhat was the reasons for it not working very well? Link to comment Share on other sites More sharing options...
ratter Member 6,793 Member For: 18y 9m 4d Gender: Male Location: @ my laptop Posted 04/04/14 08:49 AM Share Posted 04/04/14 08:49 AM the port not being contoured, just milled bigger Link to comment Share on other sites More sharing options...
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