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#16
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Harvey: Look at the second posting on this page http://www.subaru-svx.net/forum/show...=25555&page=42 Look at the last map (Stg 3) Essentially I am running a map like this. I do not have the resolution though, but its a good extrapolation. I am running 30* of intitial timing at startup, which according to the listed map is too low, but close, and its as high as my software will let me go. I do go slightly above 50* where you see his curve peak. The map works. I have not pushed it at all. I'll wait for the experts and the dyno. Problem is I don't think anyone is going to want to touch a car with this much timing. We shall see. Chuck D.
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Chuck D. 1992 Subaru SVX LS-L - Heavily modded turbo 2002 Subaru Impreza WRX- Turboxs stg3 & Susp. Mods |
#17
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hey chuck,
long time no talk. i quit my old job and now i'm a bartender. new hours are killing me and i've been working about everyday. that's the reason for the short pms and no responses. you are seeing 50 degrees of timing? shouldn't you be falling off the map for timing advancment? i don't think the compression is the reason for having to run such high timing. on my cobra i was running 26-27 degrees of total timing. its also a 10:1 engine. that was on race gas to. hmm. do you think there is any way something could be hooked up wrong? iono. i'll give you a shout later tonight.
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92 LS-L been sitting for 6 years. 86 fiero gt, t-tops, 3800sc, headers, intercooler, p&p blower and lower intake, 3.0 pulley, 1.6RR's, double roller timing chain, xp cam, 130lb valve springs and hooisers :P 87 starion- currently rides on jackstands. |
#18
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No there is nothing wrong, the car loves timing and for some reason loves it on boost as well. It makes no real sense to anyone, but it is working really well
Tom |
#19
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Finish work
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You need to check out page 42 of the stage III supercharger. I'm using a map simulated from that. It works great. I'll talk to you soon.
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Chuck D. 1992 Subaru SVX LS-L - Heavily modded turbo 2002 Subaru Impreza WRX- Turboxs stg3 & Susp. Mods |
#20
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cobra's gone. the black car is nearing it's final assembly of the engine. just one more time to put it together and it will be done and ready to go back in the car. i'm not sure if i told you i dumped my huge procharger f1 for a turbo. i'm hoping to break the 1krwhp mark with my newest changes and only 22lbs to do it out a 283ci motor. here's a pic of something that is going to be hard to fit under the stock hood.
what do you think of that?
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92 LS-L been sitting for 6 years. 86 fiero gt, t-tops, 3800sc, headers, intercooler, p&p blower and lower intake, 3.0 pulley, 1.6RR's, double roller timing chain, xp cam, 130lb valve springs and hooisers :P 87 starion- currently rides on jackstands. |
#21
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Hits about 34*BTDC at full throttle, which is what a combustion chamber this size would need, to achieve maximum pressure by 13/15*ATDC. As the boost pressure goes up, the advance needed is less, due to the higher pressure that increases the burn speed. Exhaust gas temps are at their max at about 14.7:1 A/F, but are also the result of the burn time. A late burn produces high EGT. Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#22
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Numbers
Harvey:
I don't know where you are getting 12-15*. Please explain. I am seeing about 34* at max load and max RPM. Are you familiar with the scale he is using? Thanks Chuck D.
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Chuck D. 1992 Subaru SVX LS-L - Heavily modded turbo 2002 Subaru Impreza WRX- Turboxs stg3 & Susp. Mods |
#23
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The main objective of advancing the spark is to give time for the burning gas to heat up the air in the cylinder, so that the maximum pressure in the cylinder is developed, when the piston is about 13/15* ATDC. At this angle the pressure acting on the con rod, can turn this pressure into rotational force at the crankshaft. If the maximum pressure is developed too early (too much advance), the con rod is too vertical, and the pressure just pushes the crank down, instead of rotating it. If it is too late( too much retard), The con rod is past the point of angularity, and the combustion chamber is growing too big to develop the maximum pressure. So the spark advance is tied to the burn time. The burn time is affected by; The mixture strength, lean burns longer. Compression pressure, more pressure burns faster. Con rod length, short rods burn faster. Combustion chamber shape. High turbulence burns faster. So the advance for the engine is set to the point that will have the maximum burn pressure arrive at 13/15*ATDC. Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. Last edited by oab_au; 10-04-2006 at 06:44 PM. |
#24
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Thinking
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Chuck D. 1992 Subaru SVX LS-L - Heavily modded turbo 2002 Subaru Impreza WRX- Turboxs stg3 & Susp. Mods |
#25
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what? this car is setup up right. you will have to wait and see what i'm talking about. i think you will be suprised on how well i put it together
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92 LS-L been sitting for 6 years. 86 fiero gt, t-tops, 3800sc, headers, intercooler, p&p blower and lower intake, 3.0 pulley, 1.6RR's, double roller timing chain, xp cam, 130lb valve springs and hooisers :P 87 starion- currently rides on jackstands. |
#26
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Fast Cars
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Chuck D. 1992 Subaru SVX LS-L - Heavily modded turbo 2002 Subaru Impreza WRX- Turboxs stg3 & Susp. Mods |
#27
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phil
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~Phil Teal 1992 Subaru SVX Turbo - Sold in May 2011 to peace-frog. |
#28
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Multiple Cars
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Chuck D. 1992 Subaru SVX LS-L - Heavily modded turbo 2002 Subaru Impreza WRX- Turboxs stg3 & Susp. Mods |
#29
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It's been a while. Would you say, our engines are equipped with short length connecting rods? And would you say we have a high turbulance combustion chamber?
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www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link |
#30
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Quote:
The shorter the rod, the faster the piston moves across TDC. This causes the compression space to change, through the burning phase. The longer rod keeps the combustion space, pretty much the same during the burn. The shorter rod length, suits the high speed, high compression engine, better than the longer rod. The ample squish area provides the turbulence that is needed to keep the burn time reducing, as the engine rpm increases, otherwise we would need to keep advancing the spark timing as the engine speed increases. Harvey. Shouldn't you be putting sheets up on your erection?
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
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