The Twin Screw Thread
12-09-2005, 09:56 PM
#17
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Originally Posted by BrendanC
Tony are you going to try for 10 or 11? I'd really like to see the power curve on that. It would be great to compare that to whomever else has gone that high. Do you have enough fuel for that?
Well, a new Walbro 255lph pump is enroute, that will help.
30 or 42lbs injectors will have to go in...probably 30s as the 42s wont idle too well from what ive heard.
as far as the BEGI unit SHANE, ill get a pic. Im wating as i type for an overhaul kit from them as i bew up the metal diaphram in mine with a fuel pressure experimentgone bad LOL. I wanted to data log the differnt fuel pressures and slope vs boost as i adjusted the needle valve and center screw. The over haul kit i think includes a schematic of the device...ill no more when it comes. Ill grab a picture of mine when i get it set back up.
The check valve goes on the needle valve fitting...NOT THE BARBED FITTING ON THE OTHER SIDE.
If you mean the fuel lines, the BEGI unit should have been stamped with the letters "IN" above one of the 1/4npt ports.
Also if you have a ruptured diaphram, your fuel pressure will pretty much max out and the car will run rich untill it dies....thats what mine seemed to do.
Your pump will also make wierd noises...i think it was cavitation on mine.
each failure may manifest itself differntly....but thats what happend to me a few days ago.
HTH
Last edited by Tony; 12-09-2005 at 10:17 PM.
12-09-2005, 10:00 PM
#18
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I was under the impression that the 928SP kit was indeed the next evoloution of Andy's kit, and that he was helping them with the development. He was going to do it with Devek, but I guess that fell through. Andy's a smart guy, and you have to give him credit for getting the system off the ground. He just could not keep up with the constant demand for tech support. It makes perfect sense for him to try to pass off the kit to one of the "Big 3" to take over sales and support.
12-09-2005, 10:14 PM
#19
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EB338, look for the original 928 Specialists supercharger thread. The similarities and differences were discussed. IIRC, none of the major components are compatible.
12-09-2005, 10:19 PM
#20
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Without a doubt
It absolutely makes sense for him to pass off the kit... however, there are a lot of people with his 'old' kits who are still waiting for parts, can't get answers to installation problems etc. that are feeling pretty screwed. A few quick e mails from Andy would go a long way for some folks.
It absolutely makes sense for him to pass off the kit... however, there are a lot of people with his 'old' kits who are still waiting for parts, can't get answers to installation problems etc. that are feeling pretty screwed. A few quick e mails from Andy would go a long way for some folks.
Originally Posted by bcdavis
I was under the impression that the 928SP kit was indeed the next evoloution of Andy's kit, and that he was helping them with the development. He was going to do it with Devek, but I guess that fell through. Andy's a smart guy, and you have to give him credit for getting the system off the ground. He just could not keep up with the constant demand for tech support. It makes perfect sense for him to try to pass off the kit to one of the "Big 3" to take over sales and support.
12-09-2005, 10:25 PM
#21
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Here ya go
928 SP SC link
https://rennlist.com/forums/928-forum/230957-sneak-peek-supercharged-by-928-specialists.html
Customized Supermodel set up.
https://rennlist.com/forums/928-forum/242306-sc-install-with-links-to-pics.html
928 SP SC link
https://rennlist.com/forums/928-forum/230957-sneak-peek-supercharged-by-928-specialists.html
Customized Supermodel set up.
https://rennlist.com/forums/928-forum/242306-sc-install-with-links-to-pics.html
12-09-2005, 10:46 PM
#23
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Originally Posted by Tony
The check valve goes on the needle valve fitting...NOT THE BARBED FITTING ON THE OTHER SIDE.
HTH
HTH
Yep that was how mine was set up. But IIRC, they were suggesting it be the other way around. My needle valve was wide open and the adjusting screw was just barely turned in, and I still had to have an aditional needle valve on the vacuum/boost line going to the BEGI to limit the signal it was seeing. Otherwise I was still way rich even with the 24# injectors.
12-10-2005, 12:17 AM
#24
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I actually don't think Andy was aware of the hose fix right away. By the time he knew of it and verified it, he was already on his way out of the 'scene'. It also isn't an idiot-proof swap... the hose gets much closer to the fan and CAN be cut by the fan if not installed a certain way.
Originally Posted by Jim_H
With Andy phasing out of the TS world and many of us having his systems there are a lot of questions and ideas that I think arent going anywhere. Maybe this can be a thread where we can do some Q & A and maybe improve on what we have. Maybe even swap some parts.
For instance, somehow the fact that the pre S4 radiator hose (ds) remedies the cut hose problem didn't get passed along to all.
Critiquing the system is fair game also, especially if there is a solution by the critquer
For instance, somehow the fact that the pre S4 radiator hose (ds) remedies the cut hose problem didn't get passed along to all.
Critiquing the system is fair game also, especially if there is a solution by the critquer
12-10-2005, 12:21 AM
#25
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I haven't had my own supermodel for a while, but IIRC, that "pipe" in front of the SC for the IC is actually an IC OUTPUT (not input). It was designed that way for a reason. If you put water INTO it, there is a chance that water would go in, and run out the bottom of the IC (and not fill the entire IC up thereby reducing efficiency).
Originally Posted by Tony
Also, if you have the snout support with the 3 aluminum cyclindrical spacers on the back...CHECK them. One of the spacers on Darriens "kit" was a different length. If it was supposed to be that way, i havent seen anything to show me that?
It skewd the whole alignment of the tensioner/ilder pulley and messed it up. Scuffed up a SC belt as well when the car was first started and the belt found its comfortable running position.....half of it folded up on to the AC pulley!
By adding a couple of thin washers to the spacer i got Darriens belt running smack dab in the middle of the idler pulley.
Ive got a few things relating to the I/C system that cleans it up a bit. The newer manifolds have the I/C inlet pipe on the top. The older ones were in the front and allowed for a more stealthy run of hose to the heat exchanger.
I fab'd up a 180' turn for Darriens so the hose can now run under the snout and down along the lower rad hose where it eventually meets the heat exchanger inthe front bumper.
this was the copper fitting i made
Ill get a pic of it at some point. Its not really needed, but we didnt care for a big 3/4" hose coming off the top of the manifold towards the passenger fender area.
Also, something im looking into eventually is some more boost. With a swap to a smaller pulley i think you will run up against some significant belt slip as we dont have the nice belt wrap like DR has on his setup
Another way to increase the boost besides going to a smaller upper pulley is to make the lower pulley bigger
I havent tried it yet or done the math on the pulley ratio/boost etc. but believe it or not, the MURPH lower pulley may be useable on the TS set ups. Even though Murph uses 8 rib and the TS 6rib, the plane that they run in is the next position fwd of the AC pulley. This would give you a larger LOWER pulley instead of a smaller upper......as not to get to wild you would probably have to go to a slightly bigger upper pulley also(hood clearnce???..dunno)! Just a thought for you Jim....since 460 HP isnt enough
top...stock
middle...TS
bottom ...MURPH
It skewd the whole alignment of the tensioner/ilder pulley and messed it up. Scuffed up a SC belt as well when the car was first started and the belt found its comfortable running position.....half of it folded up on to the AC pulley!
By adding a couple of thin washers to the spacer i got Darriens belt running smack dab in the middle of the idler pulley.
Ive got a few things relating to the I/C system that cleans it up a bit. The newer manifolds have the I/C inlet pipe on the top. The older ones were in the front and allowed for a more stealthy run of hose to the heat exchanger.
I fab'd up a 180' turn for Darriens so the hose can now run under the snout and down along the lower rad hose where it eventually meets the heat exchanger inthe front bumper.
this was the copper fitting i made
Ill get a pic of it at some point. Its not really needed, but we didnt care for a big 3/4" hose coming off the top of the manifold towards the passenger fender area.
Also, something im looking into eventually is some more boost. With a swap to a smaller pulley i think you will run up against some significant belt slip as we dont have the nice belt wrap like DR has on his setup
Another way to increase the boost besides going to a smaller upper pulley is to make the lower pulley bigger
I havent tried it yet or done the math on the pulley ratio/boost etc. but believe it or not, the MURPH lower pulley may be useable on the TS set ups. Even though Murph uses 8 rib and the TS 6rib, the plane that they run in is the next position fwd of the AC pulley. This would give you a larger LOWER pulley instead of a smaller upper......as not to get to wild you would probably have to go to a slightly bigger upper pulley also(hood clearnce???..dunno)! Just a thought for you Jim....since 460 HP isnt enough
top...stock
middle...TS
bottom ...MURPH
12-10-2005, 12:23 AM
#26
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The supermodel forum isn't really accepting new users. It currently serves as "knowledgebase" of sorts for customers who already had logins.
Originally Posted by MrLexse
Could this be done on the Supermodel forum, or is it defunct?
12-10-2005, 12:25 AM
#27
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I don't think Andy would call it a favor...
Originally Posted by Tony
IMHO...From what i can gather people arent being given the time of day on that forum from the person that should be giving it.
So, why give the forum the traffic and the owner the return favor.
There is a great wealth of knowledge and diversity on THIS forum alone that can be of benefit to the folks out there who run the twinscrew. The people who provide it dont have access to the "supermodel" forum and most likely arent TS owners, so if they want to chime in on this thread they are more than welcome to and dont have to be "approved" to do so..
I imagine over time the thread here will fall off the pages or perhaps turn into a TS vs CS vs TURBO debate but in the mean time it seems like a pretty good idea?
So, why give the forum the traffic and the owner the return favor.
There is a great wealth of knowledge and diversity on THIS forum alone that can be of benefit to the folks out there who run the twinscrew. The people who provide it dont have access to the "supermodel" forum and most likely arent TS owners, so if they want to chime in on this thread they are more than welcome to and dont have to be "approved" to do so..
I imagine over time the thread here will fall off the pages or perhaps turn into a TS vs CS vs TURBO debate but in the mean time it seems like a pretty good idea?
12-10-2005, 01:09 AM
#28
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Tony: You're a genius! The Murph pulley idea is phenomenal. I like the plumbing change too, although Mike is right - you should fill from the bottom.
Daryl, et al: I will post details on making the throttle bracket soon. I'm still willing to make them for free. Hard to charge for something made with a hack saw and patio door wheels. Here's a link that shows the installation.
http://www.billsworkshop.com/P928S4/sc/throttle.htm
Shane: At Sharktoberfest we never had a consensus on how the Begi should be hooked to vacuum. We had cars running both ways. I don't have one, so I hope you guys sort it out. Regardless, Derek's car was running real rich. Also, he said his AFM was steady and never oscillated as I think they are supposed to. Sounds like a broken 02 sensor, although it had been replaced and Greg Brown spent 5 hours trying to tune it.
Mike: Unless Andy is actively processing the posts on his forum, I don't see how he could be upset with posting here. This is a great place to get more eyes looking at things and it will potentially expand the Eaton/Twin screw fan base. I have always admired Andy and wouldn't want to do anything that would harm or upset him. If this is a real issue, please explain.
Daryl, et al: I will post details on making the throttle bracket soon. I'm still willing to make them for free. Hard to charge for something made with a hack saw and patio door wheels. Here's a link that shows the installation.
http://www.billsworkshop.com/P928S4/sc/throttle.htm
Shane: At Sharktoberfest we never had a consensus on how the Begi should be hooked to vacuum. We had cars running both ways. I don't have one, so I hope you guys sort it out. Regardless, Derek's car was running real rich. Also, he said his AFM was steady and never oscillated as I think they are supposed to. Sounds like a broken 02 sensor, although it had been replaced and Greg Brown spent 5 hours trying to tune it.
Mike: Unless Andy is actively processing the posts on his forum, I don't see how he could be upset with posting here. This is a great place to get more eyes looking at things and it will potentially expand the Eaton/Twin screw fan base. I have always admired Andy and wouldn't want to do anything that would harm or upset him. If this is a real issue, please explain.
12-10-2005, 02:40 AM
#29
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Originally Posted by Bill Ball
Tony: You're a genius! The Murph pulley idea is phenomenal. I like the plumbing change too, although Mike is right - you should fill from the bottom.
Daryl, et al: I will post details on making the throttle bracket soon. I'm still willing to make them for free. Hard to charge for something made with a hack saw and patio door wheels. Here's a link that shows the installation.
http://www.billsworkshop.com/P928S4/sc/throttle.htm
Shane: At Sharktoberfest we never had a consensus on how the Begi should be hooked to vacuum. We had cars running both ways. I don't have one, so I hope you guys sort it out. Regardless, Derek's car was running real rich. Also, he said his AFM was steady and never oscillated as I think they are supposed to. Sounds like a broken 02 sensor, although it had been replaced and Greg Brown spent 5 hours trying to tune it.
Mike: Unless Andy is actively processing the posts on his forum, I don't see how he could be upset with posting here. This is a great place to get more eyes looking at things and it will potentially expand the Eaton/Twin screw fan base. I have always admired Andy and wouldn't want to do anything that would harm or upset him. If this is a real issue, please explain.
Daryl, et al: I will post details on making the throttle bracket soon. I'm still willing to make them for free. Hard to charge for something made with a hack saw and patio door wheels. Here's a link that shows the installation.
http://www.billsworkshop.com/P928S4/sc/throttle.htm
Shane: At Sharktoberfest we never had a consensus on how the Begi should be hooked to vacuum. We had cars running both ways. I don't have one, so I hope you guys sort it out. Regardless, Derek's car was running real rich. Also, he said his AFM was steady and never oscillated as I think they are supposed to. Sounds like a broken 02 sensor, although it had been replaced and Greg Brown spent 5 hours trying to tune it.
Mike: Unless Andy is actively processing the posts on his forum, I don't see how he could be upset with posting here. This is a great place to get more eyes looking at things and it will potentially expand the Eaton/Twin screw fan base. I have always admired Andy and wouldn't want to do anything that would harm or upset him. If this is a real issue, please explain.
You're right, the forum is dead. Regardless of what goes on here or there, I don't think Andy cares either way. I thought he'd ask me to close it down, but he didn't even do that (i wouldn't be surprised if he forgot about it). I only continue to host it so it acts as a knowledgebase for anyone who has a login. I know he's finally busy with his own life once again (now that 928supermodel is "dead"), and i'm happy for him. He's got NOTHING to be upset about, so please do share all the info you can to keep this limited production-run working. All I ask is that people just stop talking about him with ANY negativity... there's no point in villanizing him. Just remember him as someone who tried to give us another option for our cars.
12-10-2005, 08:57 AM
#30
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Andy is a stand up guy. This is what I was told and that is what I have come to know. Maybe when (and if) he decides to "chime in" again on a regular basis, we'll have the additional benefit of his insight, but until then, remember he's human. Many of us are better off today because he gave it a shot, regardless how things turned out. It seems to me that if the Supermodel Forum is no longer acting as the knowledge base and discussion center for twin screwers, Tony's idea to use this forum for twin screw threads, Q&A, developments etc. sounds good. Tonys participation makes it even better. Let the games begin.