Andrew, Yeah, that EBC I was using was a Fuzzy Logic type. I was sceptical at first, but when you see it learning as you drive it's pretty convincing. I'm a convert.
It basically learns the boost response of the engine as you drive it. The first time it comes on boost it overshoots a lot and then oscillates up and down around the set level. The next time it comes on boost it does the same, but overshoots less. After doing this a few times the boost comes up cleanly to the set level and doesn't overshoot. Sweet. PL -----Original Message----- From: andrew smith [mailto:[EMAIL PROTECTED]] Sent: Tuesday, 22 January 2002 12:49 To: [EMAIL PROTECTED] Subject: Re: acutator Mark, To use a solenoid type device you need something to control it.To have any advantage over a conventional bleed system it needs to be kept closed until the desired boost is reached thus reducing wastegate creep.Some people have used a variable speed drill circut to achieve this but i have a feeling that the steeper type motors are unhappy being pulsed.There are other soleniods available that will keep up with the fast pulsing like those used with electronic boost controllers.The problem with the variable speed type controllers is that they can sometimes give different boost levels depending on the load(different boost in low gears etc).The after market electronic boost controllers use a fuzzy logic self learn type setup that eliminates that problem.Some ecu's will do the same.Anyone else on the the list that is better with electrical stuff should be able better explain this. Putting a volume like a aerosol can in the system can reduce waste gate creep.It should be fitted after the line restriction and before the actuator.The idea behind it is that the pressure take time to fill the volume so the wastegate sees pressure later reducing creep.You can try different size volumes until you get it right.You can usually tell when its working as you start to get boost spikes after gear changes.A couple of psi is usually acceptable just make sure its not detonating. Andrew Smith mark krawczuk wrote: > hey , what about using a idle bypass solenoid from a commodore throttle body > to controll boost? it has a stepper type motor on it so it can be adjusted > finely, this might be better than using the old brass needle valve > setup,,,, ( i`m using this set up at the mo) > > i heard about putting a cannister ( aerosol can) some where in the > acutator line... how do i do this? and exactly what does this do? > > mark k > ----- Original Message ----- > From: "LIEBIG, Peter" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Tuesday, January 22, 2002 10:46 AM > Subject: RE: Exhaust sizes (HELP) > > > Andrew, > > > > Ahh, the people you run into on the Ozdat list eh! > > > > GT25 is going well. I was a bit disappointed at first, because the boost > was > > still dropping off high in the rev range - the main reason I wanted to > > upgrade, but once I got the right WG actuator it was better. I was using > the > > old T25G actuator, but the GT25's should have a much larger actuator. > > > > I tried an Electronic Boost Controller out awhile ago and it really was > the > > turning point. It proved that my turbo setup is capable of supplying as > much > > boost as I want all the way to redline. The boost is there - it's just a > > matter of controlling it properly! It made a huge difference. Very happy. > > Pity they are all so expensive! > > > > How's the 1200 going? Got a T4 on it yet? :-) > > > > PL > > > > > > -----Original Message----- > > From: Andrew Denniss [mailto:[EMAIL PROTECTED]] > > Sent: Friday, 18 January 2002 19:47 > > To: [EMAIL PROTECTED] > > Subject: Re: Exhaust sizes (HELP) > > > > Hi pete long time no hear hows the gt25 going?? > > cheers andrew > > > > "LIEBIG, Peter" wrote: > > > > > Hi Daniel, > > > > > > Yeah, I thought I'd come back and see how the list is going! I was > > > subscribed on my home address before and it was getting a bit much. This > > > time I've tried doing it at work, so we'll see how it goes. Between the > > > Srtransplants list and this one I'm afraid my email volume may be > getting > > a > > > bit high! > > > > > > I'm currently not running a cat (smack smack!), but when I do I guess it > > > will be in the usual place just after the dump pipe. > > > > > > The best dump pipe dia is generally 3". That's pretty much the biggest > > > you'll fit without hassles. I've made a few now and I'm considering > making > > a > > > batch for sale to suit SR's into 1600's. I'll send you a photo of one. > > I've > > > seen a lot of "professional" dump pipes and I've decided that it > wouldn't > > be > > > too hard to improve on them myself! > > > > > > PL > > > > > > -----Original Message----- > > > From: Daniel Kroehn [mailto:[EMAIL PROTECTED]] > > > Sent: Wednesday, 16 January 2002 18:57 > > > To: [EMAIL PROTECTED] > > > Subject: Re: Exhaust sizes (HELP) > > > > > > HOLY SHIT, > > > > > > where did you come from Pete, I thought you'd left the list forever? > > > Anyway, thanks for the advice. The muffler I have coming has a 2.25 > inlet > > > and 4 inch outlet. So I'm still undecided what size to go from the > > > crossmember back. Up until the crossmember I'm going to use 3 inch for > > > sure. Where did you mount your cat? The other question I have is what > > size > > > dump pipe to use? I want to seperate the internal wastegate gases from > > the > > > turbine gases and join them together after the dump pipe exits the > engine > > > bay. The turbine itself is only about 2.25" in diameter so should I use > a > > > 2.25" - 3" reducer/expander and build a 3 inch dumpy with a 1.25" > seperate > > > wastegate pipe? > > > > > > Cheers > > > > > > Daniel Kroehn > > > ----- Original Message ----- > > > From: "LIEBIG, Peter" <[EMAIL PROTECTED]> > > > To: <[EMAIL PROTECTED]> > > > Sent: Wednesday, January 16, 2002 3:15 PM > > > Subject: RE: Exhaust sizes (HELP) > > > > > > > Daniel, > > > > > > > > I'm with Geordie - 3" up front with 2 1/2" down back is a good > > compromise. > > > > Easier to silence too. And if it's on a 1600 it's heaps easier to get > it > > > > through the rear crossmember. > > > > > > > > I'm running that setup with my SR20 and at 14psi boost the exhaust > > > > backpressure never exceeds 3 psi. > > > > > > > > PL > > > > > > > > > > > > -----Original Message----- > > > > From: Geordie Smith [mailto:[EMAIL PROTECTED]] > > > > Sent: Tuesday, 15 January 2002 15:13 > > > > To: [EMAIL PROTECTED] > > > > Subject: RE: Exhaust sizes (HELP) > > > > Importance: High > > > > > > > > > > > > 2.5" is generally a lot cheaper and in my opinion there is not a lot > of > > > > benefit to the expense of going to a 3" system. > > > > If you want the best of both worlds, you can go for 3" off the turbo > and > > > go > > > > down to 2.5" further back as the gas is cooler and will condense > > slightly. > > > > > > > > -----Original Message----- > > > > From: [EMAIL PROTECTED] > > > > [mailto:[EMAIL PROTECTED]]On Behalf Of Daniel > Kroehn > > > > Sent: Sunday, 13 January 2002 8:36 PM > > > > To: [EMAIL PROTECTED] > > > > Subject: Exhaust sizes (HELP) > > > > > > > > > > > > List, > > > > > > > > heres a question for all you switched on turbo boys. Following > > > traditional > > > > lines for an exhaust, I was going to get a 3 inch system for my turbo > > > > project. However after reading "maximum boost" by corky bell, it > seems > > > that > > > > he reckons that for the approximate engine power output of my engine, > I > > > > should use a 2.5 inch system. The book also states that for a turbo > > setup > > > > the least exhaust is the best? I'm very confused by now. Anyway back > > to > > > > the 2.5 inch set-up, this size comes from a few calculations to do > with > > > > exhaust gas velocities. He recommends that the exhaust gases > shouldn't > > > > exceed ~450 feet per second, and thus a 3 inch system would be capable > > of > > > > much more than that, so no good? > > > > There's a bit more in the book but at this stage I've just become > > totally > > > > confused. > > > > > > > > Eagerly awaiting some opinions.................. > > > > > > > > Daniel Kroehn > > > > > > > > > > > > --membersozdat------------------------------------------------------- > > > > OZDAT Mailing List Please Note:- > > > > Send (un)subscribe requests to [EMAIL PROTECTED] > > > > Send submissions to [EMAIL PROTECTED] > > > > No unauthorised redistribution of this email > > > > http://www.ozdat.com/ozdatonline/index.htm > > > > http://www.ozdat.com/ozdatonline/listindex.html > > > > http://www.mail-archive.com/[email protected]/ > > > > --------------------------------------------------------------------- > > > > > > > > > > > > --membersozdat------------------------------------------------------- > > > > OZDAT Mailing List Please Note:- > > > > Send (un)subscribe requests to [EMAIL PROTECTED] > > > > Send submissions to [EMAIL PROTECTED] > > > > No unauthorised redistribution of this email > > > > http://www.ozdat.com/ozdatonline/index.htm > > > > http://www.ozdat.com/ozdatonline/listindex.html > > > > http://www.mail-archive.com/[email protected]/ > > > > --------------------------------------------------------------------- > > > > > > > > > > > > > > --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[email protected]/ ---------------------------------------------------------------------
