vacuum and transmissions?
04-02-04, 01:26 AM
#1
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vacuum and transmissions?
2 questions, please answer based on fact/personal experience rather than theory.
1. What is the difference between s5 T2 and N/A trannys? Are there any different trannys among the N/As?
2. Does negative vacuum indicate what kind of life your engine has left? If so, what should it read on the negative part of a standard boost gauge (psi or bar). (found a thread with avg. readings, but because of porting, it seems readings were affected)
Thanks,
Jack
1. What is the difference between s5 T2 and N/A trannys? Are there any different trannys among the N/As?
2. Does negative vacuum indicate what kind of life your engine has left? If so, what should it read on the negative part of a standard boost gauge (psi or bar). (found a thread with avg. readings, but because of porting, it seems readings were affected)
Thanks,
Jack
04-02-04, 01:34 AM
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vacuum is the opposite of pressure. Pressure is positive and vacuum is negative. So, negative vacuum isn't the right term. Negative vacuum is boost.
Vacuum is like reserve power meter. As long as you have vacuum, you will be able to make more power, until you reach zero on the gauge (zero being no vacuum or no boost pressure.) Then the engine is taking in as much air as it can. Once you add a device like a turbo, you can force in more air than the engine can inhale on its own. Hence, forced induction. This, as you know, starts at zero and goes up from there.
Vacuum can't indicate the life expectancy of the engine, but it can tell you its current condition. If the gauge fluctuates at idle, or if its too low, are just a couple signs of a defect in the engine.
Vacuum is like reserve power meter. As long as you have vacuum, you will be able to make more power, until you reach zero on the gauge (zero being no vacuum or no boost pressure.) Then the engine is taking in as much air as it can. Once you add a device like a turbo, you can force in more air than the engine can inhale on its own. Hence, forced induction. This, as you know, starts at zero and goes up from there.
Vacuum can't indicate the life expectancy of the engine, but it can tell you its current condition. If the gauge fluctuates at idle, or if its too low, are just a couple signs of a defect in the engine.
04-02-04, 06:23 AM
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What kind of numbers are you guys seeing as "Normal" on your gauges? In normal driving I'm pulling around 10hg in most gears under 3KRPM. (With a high of 15hg under 3KRPM)
I know for a fact my 6ports dont work. (One is stuck open, one stuck shut.) I'm pretty sure that would affect it.
I know for a fact my 6ports dont work. (One is stuck open, one stuck shut.) I'm pretty sure that would affect it.
04-02-04, 06:56 AM
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Originally posted by Tofuball
What kind of numbers are you guys seeing as "Normal" on your gauges? In normal driving I'm pulling around 10hg in most gears under 3KRPM. (With a high of 15hg under 3KRPM)
I know for a fact my 6ports dont work. (One is stuck open, one stuck shut.) I'm pretty sure that would affect it.
What kind of numbers are you guys seeing as "Normal" on your gauges? In normal driving I'm pulling around 10hg in most gears under 3KRPM. (With a high of 15hg under 3KRPM)
I know for a fact my 6ports dont work. (One is stuck open, one stuck shut.) I'm pretty sure that would affect it.
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04-02-04, 10:14 AM
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Warm engine, no loads, at sea level, 750RPM: 15-18"Hg.
For example: TII 90,000 miles, compression 85/90
For example: TII 90,000 miles, compression 85/90
Last edited by SureShot; 04-02-04 at 10:18 AM.
04-02-04, 11:52 AM
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Originally posted by JackoliciousLegs
mine sits at 13-15... that ok?
mine sits at 13-15... that ok?
One indicator - When you shutdown, it should take slightly more than 1 second for the vac to equalize.
Last edited by SureShot; 04-02-04 at 11:54 AM.
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