Steve W Posted June 6, 2003 Share Posted June 6, 2003 Lads, this is a paste of a P'M' I sent to Matt yesterday... ...can someone explain further....particularly, IF it's supposed to do something BELOW max' boost, HOW ? ? AT what revs does max' boost normally occur too ? ********************************************** " I'm just pondering one next, just like to see/know how one fits etc. like...am I capable etc. You said last time that it takes the READING from the intake manifold-ish and it 'cuts' into the wastegate operating pipe (?) Is that IT - if so then I presume it ONLY affects MAXIMUM boost ? or does the Actuator come into it (or am I getting entirely cocked- up and the Actuator 'ACTUATES' the wastegate ? ? ) Can it / does it affect boost BEFORE maximum ? ? just tryin' to get me 'ead round it all..... after all, it IS ~£300/400 even if I fit it !? that's a lot of petrol/beer/Big-Mac money " ********************************************** FatS. Quote Link to comment Share on other sites More sharing options...
Gaz Walker Posted June 6, 2003 Share Posted June 6, 2003 They do seem expensive but they do offer clever features for that money (normally). If you want the same principle but without all the electronic stuff, get a mechanical boost controller... Normally you get the highest boost in 4th gear on a manual, it'll probably be 3 or4 on the Auto... At what revs after 4k and the second turbo comes in. The point of a boost controller is to hold the boost at level you specify... Have a look on the howstuffworks.com site, it'll probably explain it in laymans terms better than any of us can. Gaz. Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted June 6, 2003 Share Posted June 6, 2003 They allow you to try and maintain a boost setting anywhere between stock boost and maximum boost (destruction). They achieve this by keeping pressure off the wastegate (and hence wastegate staying closed) until your desired level and then it will open the wastegate quickly. That's a very basic summary and some of them do work slightly differently and depending on how they are plumbed in. Quote Link to comment Share on other sites More sharing options...
Need4Speed Posted June 6, 2003 Share Posted June 6, 2003 I have a Blitz dual SBC and consider it to be a fantastic piece of kit for the money. What it does is: monitors the boost level and then bleeds off a liitle boost to fool the waste gate into staying shut. If you are running 1 bar, the waste gate only sees 0.7bar max etc. other useful things is it gives you a boost gauge with a peak hold reading (handy for spotting boost spikes) and different settings that you can pre-program for different levels of boost. I keep the top level for track with octane booster etc and normally run the next one down. You can also turn off the unit and your car becomes standard again. In terms of what it does (more power) for the money, I rate it. Mechanical bleed valves are OK if you have an XR2 turbo, but that's it. Quote Link to comment Share on other sites More sharing options...
eyefi Posted June 7, 2003 Share Posted June 7, 2003 basically they control boost, but they can only control boost within the mechanical limits. it relies on existing parts on yr car to b able to do its job correctly. if them parts rnt quite up to the job there is nothing the boost controller can do. eg if the wastegate isnt big enough to allow enough exhaust gas to escape the turbine, then the boost controller can keep the wastegate open as long as it wants, to try and lower the boost, but it wont have any effect. if everything was mechanically perfect to allow the boost controller to do its job, it would. the BC also has an effect on how fast u build boost. Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted June 7, 2003 Share Posted June 7, 2003 In more basic terms, they make the car go faster... What more do you need to know? Quote Link to comment Share on other sites More sharing options...
MONKEYmark Posted June 7, 2003 Share Posted June 7, 2003 i always thought i did not need a BC if i was hitting up to 1.4 on J-SPEC without a BC its about as much as you dare run on stock turbos. a big single you would want to control boost or UK-SPEC are they easy to fit for someone with basic skills. fitted a couple of bits and dont mind getting hands dirty. can you tell it builds boost faster with BC than without BC Quote Link to comment Share on other sites More sharing options...
Steve W Posted June 7, 2003 Author Share Posted June 7, 2003 SO, under 'normal' conditions, does the Actuator start opening BEFORE Max' Boost ? ? AND, the Controller can keep it shut 'LONGER' ? ? THAT'S the only way I can see it making ANY difference BELOW Max' Boost ? ! OTHERWISE, it's ONLY gonna increase power above, say, 4,500 revs ? .........OR........ ? ? Quote Link to comment Share on other sites More sharing options...
Need4Speed Posted June 7, 2003 Share Posted June 7, 2003 It doesn't affect anything below std. boost. Quote Link to comment Share on other sites More sharing options...
Steve W Posted June 7, 2003 Author Share Posted June 7, 2003 SO, no change at all below ~4,000/4,500 ? (or does it affect No. 1 turbo even though THAT max's lower ?) Quote Link to comment Share on other sites More sharing options...
Need4Speed Posted June 7, 2003 Share Posted June 7, 2003 My no.1 still runs 0.7 but when no.2 comes on stream, all hell lets loose! Quote Link to comment Share on other sites More sharing options...
Steve W Posted June 7, 2003 Author Share Posted June 7, 2003 RIGHT, at last, THAT'S what I wanted to know John... SO, on yours, it seams to only affect MAX boost - which is basically all the time No.2 is in - as long as the loud pedal is pressed ! CHEERS John. ANYBODY second that ? ? No. 1 or LIGHT No. 2 is the same.... but HARD No.2 is where the increase is felt ?? Quote Link to comment Share on other sites More sharing options...
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