hi, i know that there are special stepper controllers to controll the stepper motors, i dont think that u can use a ordinary voltage controller, silicon chip magazine have produced circuits for this stepper motor.
----- Original Message ----- From: "andrew smith" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, January 22, 2002 12:48 PM 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]/ ---------------------------------------------------------------------
