carl0s Posted May 9, 2006 Share Posted May 9, 2006 well, not enough anyway. Since swapping the RSR for a Greddy Power-Extreme-II, I can't get above 14psi. My car is a UK spec auto, with no cats, a 3" downpipe and a ball-and-spring type manual boost controller. I was easily hitting 18 and sometimes nearly 19psi with the RSR. I have adjusted the boost controller just now, and it's made no difference. All the way up to 140mph it won't go above 14psi. So, is this as much as my turbos can make of the exhaust energy at their disposal? i.e. is this not a wastegate issue, therefore boost controllers will be of no use? Is a less restrictive exhaust the only way for more power? Or is my boost controller hooked up wrong? There is still a little bit more to go on the screw-in of the boost controller, so I could try for more... I'd appreciate your thoughts guys Link to comment Share on other sites More sharing options...
carl0s Posted May 10, 2006 Author Share Posted May 10, 2006 Anybody? .. Link to comment Share on other sites More sharing options...
SupraJames Posted May 10, 2006 Share Posted May 10, 2006 My UK Auto made 1.2 bar boost, but my boost controller had problems controlling both turbos, only seems to make a difference to the first one..! I would personally recommend an electronic controller though, I run a Greddy Profec Spec B, and speak highly of it..! Link to comment Share on other sites More sharing options...
Pig Posted May 10, 2006 Share Posted May 10, 2006 how much have u adjusted the manual boost controller? Link to comment Share on other sites More sharing options...
Bobbeh Posted May 10, 2006 Share Posted May 10, 2006 Thought about the warm weather? Maybe thats having some effect. Link to comment Share on other sites More sharing options...
carl0s Posted May 10, 2006 Author Share Posted May 10, 2006 The MBC is screwed-in about 7/10 of the way. Previously (with the RSR on) it was in about 2/10 (a fifth) of the way. SupraJames - was that 1.2bar with a restrictive exhaust, or with your NUR? Obviously with a NUR I'd expect loads of boost.. as I had with my RSR. Not really considered the warm weather, but I was testing last night @8pm so it wasn't blistering hot.. hmm. Any more thoughts guys? Should I screw this MBC in all the way? Link to comment Share on other sites More sharing options...
Chris Wilson Posted May 10, 2006 Share Posted May 10, 2006 err, shouldn't you be screwing it OUT more.... ? Link to comment Share on other sites More sharing options...
carl0s Posted May 10, 2006 Author Share Posted May 10, 2006 err, shouldn't you be screwing it OUT more.... ? hmmm... you might be onto something there. What do you reckon? It's been some time since I fitted it Link to comment Share on other sites More sharing options...
Pig Posted May 10, 2006 Share Posted May 10, 2006 I have to screw my bleed valve OUT would make a lot of sence lol Link to comment Share on other sites More sharing options...
carl0s Posted May 10, 2006 Author Share Posted May 10, 2006 I was presuming that screwing it in was in effect shortening the spring thereby making it more difficult for the boost air to move it inside and clean the ball over the outlet.. If it's screwed out then the spring is longer and slacker... I should read the instructions again I suppose shouldn't I. This particular MBC looks like a T-shape, if you know the type. I think it's been called a 'dawes' type before. Link to comment Share on other sites More sharing options...
carl0s Posted May 10, 2006 Author Share Posted May 10, 2006 I have to screw my bleed valve OUT would make a lot of sence lol but it's not a bleeder, it blocks the pressure to the wastegate sensor thingy.. Link to comment Share on other sites More sharing options...
Clarkey Posted May 10, 2006 Share Posted May 10, 2006 Anti-clockwise for pressure. Link to comment Share on other sites More sharing options...
carl0s Posted May 10, 2006 Author Share Posted May 10, 2006 .. or something Link to comment Share on other sites More sharing options...
carl0s Posted May 10, 2006 Author Share Posted May 10, 2006 Anti-clockwise for pressure. I'm doing it right then.. clockwise for greater pressure, right. That's screwing it in.. Link to comment Share on other sites More sharing options...
Chris Wilson Posted May 10, 2006 Share Posted May 10, 2006 You need to adjust it so it bleeds more air out of the valve. I just use the dead basic bleed valves, not the spring loaded ball flash ones Link to comment Share on other sites More sharing options...
carl0s Posted May 10, 2006 Author Share Posted May 10, 2006 You need to adjust it so it bleeds more air out of the valve. I just use the dead basic bleed valves, not the spring loaded ball flash ones I might come to you for one of those then Chris. I'll have a play tomorrow anyway. Link to comment Share on other sites More sharing options...
carl0s Posted May 10, 2006 Author Share Posted May 10, 2006 You need to adjust it so it bleeds more air out of the valve. I just use the dead basic bleed valves, not the spring loaded ball flash ones I'm just thinking about it more. It's definately not a bleeder. There's no where to bleed to - it just has in and out and the screw. It's inline with the no2 wastegate actuator thingy. Link to comment Share on other sites More sharing options...
carl0s Posted May 16, 2006 Author Share Posted May 16, 2006 result! I removed the boost controller from hose 2 of the VSV, thereby allowing the VSV to leak to atmosphere, and right away I hit over 18psi without even trying So, my ball and spring MBC was not holding the boost off from the wastegate actuator as it should. The reason why? .. have a look at the pathetic spring inside it! (pics below). The answer to the original question then, is that the turbos can make *plenty* of boost regardless of a slightly restrictive exhaust.. Link to comment Share on other sites More sharing options...
Bob Posted May 16, 2006 Share Posted May 16, 2006 Blimey, high quality controller! Is that one of the ebay ones? Link to comment Share on other sites More sharing options...
carl0s Posted May 16, 2006 Author Share Posted May 16, 2006 Blimey, high quality controller! Is that one of the ebay ones? Yep Now, I need one that has a proper spring inside it, but none of those on eBay actually show the spring, and to look at, the units themselves are of a simliar size to this one. Link to comment Share on other sites More sharing options...
uk-rich Posted May 16, 2006 Share Posted May 16, 2006 it looks like a spring out of a ball point pen Link to comment Share on other sites More sharing options...
carl0s Posted May 16, 2006 Author Share Posted May 16, 2006 it looks like a spring out of a ball point pen My thoughts exactly. Link to comment Share on other sites More sharing options...
carl0s Posted May 16, 2006 Author Share Posted May 16, 2006 I know JohnA bought one which he felt was of better quality than the rest.. going in search of his thread now. Link to comment Share on other sites More sharing options...
carl0s Posted May 24, 2006 Author Share Posted May 24, 2006 Quick update: Bought and fitted a simple brass bleed valve. From Halfords of all places! They had to go searching upstairs after I tried to explain what it would look like £16.99 but I hate waiting for things I'm now hitting 16.7psi easily with a peak so far of 18.1 a few days ago. Very happy again now. I love how my car feels and drives, and sounds Ball-and-spring MBC's sucks donkey kong. I even doubled-up the spring inside that POS and still didn't get over ~14.3 psi. Link to comment Share on other sites More sharing options...
Chris Wilson Posted May 24, 2006 Share Posted May 24, 2006 Glad it's sorted, how's that exhaust? Getting a few enquiries / orders for them now. Link to comment Share on other sites More sharing options...
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