The Centrifugal Thread
01-09-2006 | 07:28 PM
#31
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Originally Posted by mspiegle
Good point. That would be the piston rings right? If they aren't sealing due to pressures, then all the air is going past them.
Well, I'm not so sure ALL that air going in at neutral is getting past the rings. I hope the hell not.
01-09-2006 | 07:30 PM
#32
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Originally Posted by BrendanC
I do believe Tim is taking the pressurized oil at the oil filter with a sandwhich unit to the gearcase on the CS. From there it simply gets squirted or sprayed into the gears you see in my avatar, and then it drips down to the drain back hole. It not really, That I know of, filling with oil, but there is alot in it at one time. A good reason to keep the temp of that oil down, thereby keeping the temp of the UNIT down, and getting the best "oilZ" to it.
Another question....the vacuum line that feeds the airpump diverter valve seems to be an interesting place to get some differential boost pressure data, as compared to vacuum sourced in the manifold, because of its location so close to the throttle plate. What do you think?
01-09-2006 | 07:33 PM
#33
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Roughly 4psi or 80 to 100 additional horsepower is what you would see at 4000 rpm on a system that's designed to peak at 6psi.
I have never seen boost while freely revving the engine with no load. You have to hit the throttle so hard to close the BOV that you would be hitting the rev limiter before noticing any boost.
Then again if you have a 5-speed car and are trying to launch it at 4krpm, you will have instant boost as soon as you let out the clutch. Traction would be almost non-existant.
I have never seen boost while freely revving the engine with no load. You have to hit the throttle so hard to close the BOV that you would be hitting the rev limiter before noticing any boost.
Then again if you have a 5-speed car and are trying to launch it at 4krpm, you will have instant boost as soon as you let out the clutch. Traction would be almost non-existant.
01-09-2006 | 07:35 PM
#34
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'Nuther question.... based on the way the H2O lines feed into the intercooler, there has to be trapped air in the intercooler. I am thinking about tapping a hole in the highest point of the IC and inserting a bleed valve. Sholld be pretty easy to get all the air out by turning on the pump, and opening the bleed valve till it spits H2O....close it up and air cannot get back into the system...Yes? Should up the efficiency of the IC.
01-09-2006 | 07:35 PM
#35
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Originally Posted by BrendanC
I don't recall any tip in detonation on Tim's Wife's Auto. I recall hanging on for dear life, and seeing the boost gauge almost hit 10, with the methanol light on, with no unusual noises, but thats about it.
Tip in is an instanteous change problem. As in splits of a second changes. When you floor it on a CS, you get 2, then 3 then 4 then 5 and so on on the PSI gauge.
The TS is more, cruising (0psi), and then you floor it. WHILE you are flooring it, the PRE-supercharger vac-thingy that lets you cruise at ATMO, will SLAM shut, thereby creating, what 6psi INSTANTANEOUSLY, Boom - boost, full boost, where there was none a split second ago.
The maf doesn't even know this happened yet, because its sitting all jolly and nice up before the vac thingy OR the Supercharger.
Put a MAP based EFI system on your TS, and the tip in should be gone.
OKay, this is a CS thread. Thats all I will say about that (in the forrest gump voice)
Tip in is an instanteous change problem. As in splits of a second changes. When you floor it on a CS, you get 2, then 3 then 4 then 5 and so on on the PSI gauge.
The TS is more, cruising (0psi), and then you floor it. WHILE you are flooring it, the PRE-supercharger vac-thingy that lets you cruise at ATMO, will SLAM shut, thereby creating, what 6psi INSTANTANEOUSLY, Boom - boost, full boost, where there was none a split second ago.
The maf doesn't even know this happened yet, because its sitting all jolly and nice up before the vac thingy OR the Supercharger.
Put a MAP based EFI system on your TS, and the tip in should be gone.
OKay, this is a CS thread. Thats all I will say about that (in the forrest gump voice)
I duno... if I were Tim, I would be slightly hesitant to give my wife 500rwhp. But hey, who knows
I seem to remember someone loaning their wife a supermodel'd car to get something. She tried to pass another car and almost went sideways when she put the throttle down. Just thought that was funny
01-09-2006 | 07:37 PM
#36
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Originally Posted by Gretch
Be interesting to know the oil flow volume in one of these things at 5 bar....I suppose they go with oil flow from the motor to keep the gearcase oil from overheating (???????), yet at the same time the source oil is gonna get pretty hot....
Originally Posted by Gretch
Another question....the vacuum line that feeds the airpump diverter valve seems to be an interesting place to get some differential boost pressure data, as compared to vacuum sourced in the manifold, because of its location so close to the throttle plate. What do you think?
01-09-2006 | 07:37 PM
#37
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Originally Posted by Ketchmi
I have never seen boost while freely revving the engine with no load.
Then again if you have a 5-speed car and are trying to launch it at 4krpm, you will have instant boost as soon as you let out the clutch. Traction would be almost non-existant.
01-09-2006 | 07:38 PM
#38
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Originally Posted by Ketchmi
Roughly 4psi or 80 to 100 additional horsepower is what you would see at 4000 rpm on a system that's designed to peak at 6psi.
I have never seen boost while freely revving the engine with no load. You have to hit the throttle so hard to close the BOV that you would be hitting the rev limiter before noticing any boost.
Then again if you have a 5-speed car and are trying to launch it at 4krpm, you will have instant boost as soon as you let out the clutch. Traction would be almost non-existant.
I have never seen boost while freely revving the engine with no load. You have to hit the throttle so hard to close the BOV that you would be hitting the rev limiter before noticing any boost.
Then again if you have a 5-speed car and are trying to launch it at 4krpm, you will have instant boost as soon as you let out the clutch. Traction would be almost non-existant.
01-09-2006 | 07:39 PM
#39
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Originally Posted by Gretch
'Nuther question.... based on the way the H2O lines feed into the intercooler, there has to be trapped air in the intercooler. I am thinking about tapping a hole in the highest point of the IC and inserting a bleed valve. Sholld be pretty easy to get all the air out by turning on the pump, and opening the bleed valve till it spits H2O....close it up and air cannot get back into the system...Yes? Should up the efficiency of the IC.
01-09-2006 | 07:41 PM
#40
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From: Bountiful, Utah
Hey Gretch, I wouldn't worry too much about air trapped in the intercooler. It's not like an engine that will have hot spots and be damaged in any way. The intercooler will probably never see the high side of 140 degrees and depending on what pump you are using, it will actually blow most of the air out to the reservior.
A CS system will have instant boost relative to rpm when you close the BOV. If you are cruising at 5krpm and floor it, you will be at instant boost in proportion to the rpm. (5psi on a 6psi system) I have not encountered any detonation at this point.
A CS system will have instant boost relative to rpm when you close the BOV. If you are cruising at 5krpm and floor it, you will be at instant boost in proportion to the rpm. (5psi on a 6psi system) I have not encountered any detonation at this point.
01-09-2006 | 07:47 PM
#41
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Originally Posted by BrendanC
You know man? You got me there. I have no idea, as whenever I get a 928, I chuck all that crap. On the S4, you don't have too many options for vac readings post throttle, as I recall.
IIRC it only accuated the diverter valve at idle though....I will go find out.......
01-09-2006 | 07:55 PM
#42
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Originally Posted by Ketchmi
Hey Gretch, I wouldn't worry too much about air trapped in the intercooler. It's not like an engine that will have hot spots and be damaged in any way. The intercooler will probably never see the high side of 140 degrees
and depending on what pump you are using, it will actually blow most of the air out to the reservior.
and depending on what pump you are using, it will actually blow most of the air out to the reservior.
Brendan....right about the metal filings.....make a mess of the pump if they are left in there....gonna have to drain the IC to do the surgery....
01-09-2006 | 07:59 PM
#43
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Originally Posted by Ketchmi
A CS system will have instant boost relative to rpm when you close the BOV. If you are cruising at 5krpm and floor it, you will be at instant boost in proportion to the rpm. (5psi on a 6psi system) I have not encountered any detonation at this point.
What method are you using to check for detonation at 5K rpms? I'm not implying there there is any, but I thought knock sensors have limits as to what they're capable of distinguishing as far as engine-noise vs knocking?
01-09-2006 | 08:04 PM
#45
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Originally Posted by mspiegle
So, how many headgaskets have centrifugals blown?
FYI: There have been no blown head gaskets with the "kit" boost levels. This kind of suprises me because of the condition of some of the head gaskets I have seen that came out of totally stock engines.