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1-6-2-4-3-5's Avatar
 
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I'm in. Let the production begin!!!!

Thanks for organizing this, Jeremy.
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Kirk
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1988 930 Daily Driver
1997 Land Cruiser
Old 08-17-2011, 07:19 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #81 (permalink)
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I could use a brake booster fitting if not too late.??
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Old 08-17-2011, 07:33 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #82 (permalink)
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3 down, 4 remaining!!

I will see if I can buy just the fitting, or do you need the booster kit?
Old 08-17-2011, 07:52 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #83 (permalink)
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Quote:
Originally Posted by jcc911 View Post
do you need the booster kit?
I've currently got a hose run down the tunnel to the intake manifold..whatever I need to connect the gauge to the brake booster up front would be a "cleaner" installation..not sure what parts that requires?
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Old 08-17-2011, 08:00 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #84 (permalink)
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1986 911 Turbo
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Old 08-17-2011, 09:19 AM
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Alright!

As for the kit, I think it just consists of a hose and check valve maybe more. I will see if it can be ordered separately.
Old 08-17-2011, 09:42 AM
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GT has also paid wpozzz and Shay (cliyde) are up.
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Jeremy C.
Why's he calling me meat? I'm the one driving a Porsche. (Bull Durham)
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Old 08-17-2011, 03:57 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #87 (permalink)
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Old 08-17-2011, 04:27 PM
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Nice!
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Jeremy C.
Why's he calling me meat? I'm the one driving a Porsche. (Bull Durham)
----Nothing is far away in this car!----
-1978 911 SC TURBO, Minerva Blue Targa 965 update.
-2008 550i M-Sport
Old 08-17-2011, 04:43 PM
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Old 08-17-2011, 04:43 PM
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Yeah Buddy! Now who will get theirs first?
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Jeremy C.
Why's he calling me meat? I'm the one driving a Porsche. (Bull Durham)
----Nothing is far away in this car!----
-1978 911 SC TURBO, Minerva Blue Targa 965 update.
-2008 550i M-Sport
Old 08-17-2011, 04:46 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #91 (permalink)
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Quote:
Originally Posted by jcc911 View Post
Yeah Buddy! Now who will get theirs first?
I'll probably get mine last as it has to go over the ocean. They'll probably send it Parcel Post or something and it'll get here inn time for Xmas. lol
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Old 08-17-2011, 10:01 PM
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I slipped an extra $20 into my order so NHS would put me at the top of the list...

JFairman's post #45 mentioned that the boost gauge's vacuum side can help indicate if an engine has adequate vacuum or not. What amount would be considered healthy? With 24 year old vacuum lines, I'm sure I have a leak somewhere....
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Old 08-18-2011, 04:01 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #93 (permalink)
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If the motor is stock 7:1 compression in good tune and fully warmed up idleing about 800rpms manifold vacuum at sea level it will be around 12-13 inches of vacuum or about 13hg for inches of mercury in a skinny vertical glass tube which is what they used to measure vacuum before round gauges with needle pointers were invented.

A 7:1 compression normally aspiriratd motor is extremely inefficiant but it is that low so you can run alot of turbo boost in these old 2 valve hemi combustion chamber air cooled heads.

By contrast a healthy motor with 10:1 compression will idle at around 20-21" of vacuum because with that compression each power stroke makes alot more heat and power with the same amount of air and fuel in the combustion chamber after the intake stroke.
Old 08-18-2011, 06:49 AM
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Jim, thanks for the info. Then for nuts like Cliyde and myself, who have done conversions, where should the vac be? As I should be at 8.5:1
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Jeremy C.
Why's he calling me meat? I'm the one driving a Porsche. (Bull Durham)
----Nothing is far away in this car!----
-1978 911 SC TURBO, Minerva Blue Targa 965 update.
-2008 550i M-Sport
Old 08-18-2011, 06:59 AM
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If I'm doing my conversion correctly, I should see -.4 to -.5 bar for a healthy, stock engine at idle?

High school physics was a long time ago, so I may be off a bit....
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Old 08-18-2011, 07:04 AM
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Quote:
Originally Posted by jcc911 View Post
Jim, thanks for the info. Then for nuts like Cliyde and myself, who have done conversions, where should the vac be? As I should be at 8.5:1
I'm not going by a math formula to figure this out, I'm going on experience with cars I own or have owned in the past that have 270 degree vacuum gauges installed in the dash.
I've installed one in every car I've owned other than a pos PT cruiser because I'm a gadget freak and I probably looked at too many JC Whitney catalogs when I was a kid...

I have a now parked BMW 3 series with a 3.5 liter big six motor with JE 10:1 compression pistons, 284 degree reground Elgin cam, and Stahl equal length headers and it idled smooth and strong around 750rpms at ~ 21" vacuum depending on the weather.

I used to have a 4 cylinder 2 liter BMW 2002 with Mahle 10:1 compression pistons, dual sidedraft weber 45DCOE carburators, and a high lift BMW motorsport 300 degree cam and Stahl headers and because of the valve overlap with that cam it idled rough but the power band up top was great.
Because of the intake and exhaust valve overlap with that cam idle manifoldvacuum was down around 16-17" of vacuum if I remember correctly.

I don't know the math formula and it depends on alot of things like compression ratio, cam duration and timing what your intake manifold vacuum will be at idle or steady cruise on level ground - including barometric pressure, altitude, and humidity so I can only guess what a well tuned healthy 930 motor would be with 8.5:1 compression.
Old 08-18-2011, 07:34 AM
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jcc911,
FWIW, I have my digital boost gauge plumbed below the throttle plate. I can see "true" manifold vac and boost pressures this way. I plan to plumb the NHS gauge in the charge pipe to show the spool threshold levels.

Cheers!
Quote:
Originally Posted by jcc911 View Post
Jim, thanks for the info. Then for nuts like Cliyde and myself, who have done conversions, where should the vac be? As I should be at 8.5:1
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Old 08-18-2011, 07:09 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #98 (permalink)
 
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Shay, so where is your vac at idle? Thanks
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Jeremy C.
Why's he calling me meat? I'm the one driving a Porsche. (Bull Durham)
----Nothing is far away in this car!----
-1978 911 SC TURBO, Minerva Blue Targa 965 update.
-2008 550i M-Sport
Old 08-18-2011, 08:25 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #99 (permalink)
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I'm seeing a small swing between 14.5- 15.5 hg of Vac at 850 RPM. Engine has 85K miles so possible worn valve guides could be contributing to that reading. I'm due for valve adjust and plug re-gap so I'll re-check soon.

From what I've read, it's not uncommon for performance tuned engines to read 14-16 hg vac at idle. I would like to think ours fit that category!
Quote:
Originally Posted by jcc911 View Post
Shay, so where is your vac at idle? Thanks
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Old 08-19-2011, 04:39 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #100 (permalink)
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