ADD Posted March 27, 2006 Share Posted March 27, 2006 i fitted a miami gt FMIC (cheers paul) last week and have only just had time to drive the car properly, but have noticed i'm running lower boost. the 1st peaks at 0.7 bar and the 2nd max just over 1 bar, i thought fitting one of these front mounts was meant to increase power!!!! any ideas? oh and ive tried it with the stock air filter on and with the apexi air filter on but no change! Quote Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted March 27, 2006 Share Posted March 27, 2006 scrap that idea and give fmic to me...;-) Quote Link to comment Share on other sites More sharing options...
ADD Posted March 27, 2006 Author Share Posted March 27, 2006 NO Quote Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted March 27, 2006 Share Posted March 27, 2006 oh go on...pretty please:vamp: Quote Link to comment Share on other sites More sharing options...
JohnA Posted March 27, 2006 Share Posted March 27, 2006 The drop in max boost only happens on supercharged engines (tightly coupled to the engine) Turbos are forced to spin harder until they reach the point where their actuator is set. If you haven't meddled with the turbo's boost pickup point (right after the compressor) then you shouldn't be seeing less boost - not appreciably anyway. Check for leaks. Boost and Power don't always go together by the way - colder air would show less static pressure (boost), yet it would make the same (or more) power. Quote Link to comment Share on other sites More sharing options...
ADD Posted March 27, 2006 Author Share Posted March 27, 2006 so it may be phychological then, even though its showing the boost decrease it could be gaining power or there abouts. think im gonna have to check for split pipes Quote Link to comment Share on other sites More sharing options...
Ian C Posted March 27, 2006 Share Posted March 27, 2006 All things being equal, if your wastegate flows the same amount of exhaust gas that means your turbos will flow the same amount of air, but the more efficient intercooler cools it more. So you have the same mass of air but it's colder and therefore denser, so it's lower pressure = lower reading on your boost gauge for the same pressure. What this means is you can tweak your boost controller settings to get the pressure back up and *that's* where you get the extra power from the intercooler. More mass of air for the same boost pressure. it's also why bigger turbos generate more power at the same boost. I ducted my intercooler back when I had hybrids on and saw a 0.05bar drop in pressure on average because of this effect -Ian Quote Link to comment Share on other sites More sharing options...
Lucifer Posted March 27, 2006 Share Posted March 27, 2006 I hate to ever disagree with JohnA but you will see a drop in boost if your last intercooler was not leeking and you new FMIC is large simply due to volume, it however should not be that noticable. It points more to a boost leak. Quote Link to comment Share on other sites More sharing options...
Ian C Posted March 27, 2006 Share Posted March 27, 2006 I hate to ever disagree with JohnA but you will see a drop in boost if your last intercooler was not leeking and you new FMIC is large simply due to volume, it however should not be that noticable. It points more to a boost leak. Mmm when the system is fully pressurised the volume of the intercooler is irrelevant. You may experience more lag if it's a big change in volume, as it gets pressurised, but no overall pressure drop. The physics don't allow it. -Ian Quote Link to comment Share on other sites More sharing options...
ADD Posted March 27, 2006 Author Share Posted March 27, 2006 alright gents thanks for you help, think im gonna go for a boost controller now then and get that boost right up. gotta try and find one at the right price!! Quote Link to comment Share on other sites More sharing options...
JohnA Posted March 28, 2006 Share Posted March 28, 2006 I hate to ever disagree with JohnA but you will see a drop in boost if your last intercooler was not leeking and you new FMIC is large simply due to volume, it however should not be that noticable. It points more to a boost leak. the volume of the i/c affects pressure after it in no way. It does affect pressure inside the core, yes. A mild static pressure drop will be due to the air being slightly cooler, because the turbo 'sensing' signal is still taken before the i/c. But we're talking here a fraction of a psi, it's not that the engine was non-intercooled before! Time to check for boost leaks indeed. Quote Link to comment Share on other sites More sharing options...
Dragonball Posted March 28, 2006 Share Posted March 28, 2006 alright gents thanks for you help, think im gonna go for a boost controller now then and get that boost right up. gotta try and find one at the right price!! I have a used HKS EVC you might want mate - good price too.. Quote Link to comment Share on other sites More sharing options...
ADD Posted March 28, 2006 Author Share Posted March 28, 2006 cheers paul, whats a good price? Quote Link to comment Share on other sites More sharing options...
Dragonball Posted March 28, 2006 Share Posted March 28, 2006 Give me a shout m8 Quote Link to comment Share on other sites More sharing options...
ardasaliah Posted March 28, 2006 Share Posted March 28, 2006 use a simple bleed valve. 1/2 a turn should see things back to normal. and only cost £2. I use one and its fine. Quote Link to comment Share on other sites More sharing options...
mr keef Posted March 28, 2006 Share Posted March 28, 2006 Yea i was running 15 psi and then i fitted a front mount and i was only getting 10psi,but the car felt quicker,checked and there was no leaks,Ian c is spot on!,turned it back up via bleed valve and now its fine! Quote Link to comment Share on other sites More sharing options...
ADD Posted March 28, 2006 Author Share Posted March 28, 2006 confused, where does the bleed valve go? Quote Link to comment Share on other sites More sharing options...
Lucifer Posted March 28, 2006 Share Posted March 28, 2006 confused, where does the bleed valve go? Be careful and make sure you are able to measure either boost or AFR's Quote Link to comment Share on other sites More sharing options...
ADD Posted March 28, 2006 Author Share Posted March 28, 2006 got a boost gauge but still dont know where to put the bleed valve? Quote Link to comment Share on other sites More sharing options...
rob wild Posted March 28, 2006 Share Posted March 28, 2006 This should help mate have a read of this: http://www.mkiv.com/techarticles/bleedert/bleedert.htm Quote Link to comment Share on other sites More sharing options...
ardasaliah Posted March 28, 2006 Share Posted March 28, 2006 the above can be confusing at first. http://www.mkivsupra.net/vbb/attachm...chmentid=13234 Bleeder goes on the pipe that the red arrow points to. Bottom nipple! Just cut that pipe in half. Put your bleeder in. Thats it. Half a turn= about 0.1 bars worth of extra boost. Be careful! Quote Link to comment Share on other sites More sharing options...
ADD Posted March 28, 2006 Author Share Posted March 28, 2006 great stuff thanks Quote Link to comment Share on other sites More sharing options...
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