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The Official "Ask Your Novice 928 Questions Here" Thread.

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Old 03-13-2008, 01:25 AM
  #46  
ddarnell
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Okay..........I'll bite. What is the LSA (lope separation angle) on the 78 16V cams? I know that I should be able to figure it out from the valve opening and closing data in the WSM, but I'm kinda challenged in that department.
Thanks,
David
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Old 03-13-2008, 02:13 AM
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Originally Posted by PorKen
The SS manifolds are lighter and flow better than stock 16V cast iron manifolds. But, cast iron manifolds with some outlet porting (51mm->55mm), flow just as well, or better, IMHO, can be upgraded on the car, and don't require a spacer. This is assuming you put 2" down pipes on either, to match.

On the flip side, removing SS manifolds and installing headers (usually) results in a reduction in horsepower.
Ken, how far down do they have to be ported to accomplish anything? IOW do they neck down at the gasket surface, are you talking about something more like extrude honing, or...? Did you just have them match the gasket?
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Old 03-13-2008, 09:08 AM
  #48  
BPG_Austin
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Can pre S4/post S4 car hoods be interchanged?
Seriously, the hi beams on my S4 are basically glorified parking lights that aluminate the surrounding ditches to my left and right? where's the 'bright?' Standard night driving is great, but those lower lights don't do squat.
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Old 03-13-2008, 10:09 AM
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Originally Posted by Andrew Olson
Where is the brake propotioning/bias valve?
Still looking for an answer on this. I gues I'd also like to know how difficult it is to swapp out.
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Old 03-13-2008, 10:24 AM
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rixter
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Originally Posted by BPG_Austin
Can pre S4/post S4 car hoods be interchanged?
all 928 hoods are the same 78-95
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Old 03-13-2008, 10:25 AM
  #51  
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Originally Posted by Andrew Olson
Still looking for an answer on this. I gues I'd also like to know how difficult it is to swapp out.
See Pic:

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Old 03-13-2008, 10:31 AM
  #52  
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Why does having a part start with the numbers 928 make it cost 4 times as much as the same part that starts with a 944?
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Old 03-13-2008, 10:52 AM
  #53  
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Originally Posted by cold_beer839
This thread should have been named in my honor.

Here is my question:

Why are there no beer can holders,.....oh uhhhh, 'CUP HOLDERS' in the 928?
thats what passengers are for.
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Old 03-13-2008, 10:58 AM
  #54  
marton
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HTML Code:
Why does having a part start with the numbers 928 make it cost 
4 times as much as the same part that starts with a 944?
Calculation of multiplication factor 928-944=4!

Andrew, are you being serious about the brake bias valve? Maybe I am losing my sense of humour...

It sits under the Brake M/C (position changed after '83); it is not hard to take out but you have to disconnect all the brake pipes & it can be #@*"# to get the bolts exactly lined up so you can get the threads started again for each pipe.
47-17 & 47-18 in the WSM

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Old 03-13-2008, 11:16 AM
  #55  
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Originally Posted by rixter
all 928 hoods are the same 78-95
Not exactly. There are two different part numbers for them. '78-88 and '89-95 IIRR. Must have something to do with engine bay light or something similar very small change.
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Old 03-13-2008, 11:21 AM
  #56  
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Originally Posted by ttaddict
thats what passengers are for.
good one!
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Old 03-13-2008, 11:41 AM
  #57  
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Originally Posted by ddarnell
Okay..........I'll bite. What is the LSA (lope separation angle) on the 78 16V cams? I know that I should be able to figure it out from the valve opening and closing data in the WSM, but I'm kinda challenged in that department.
Thanks,
David
I have a pair sitting on my work bench, is there any way to measure this?
Originally Posted by FlyingDog
What is the best thread/site for info on slushbox to 5-speed upgrades?
Upgrade or conversions?
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Old 03-13-2008, 12:01 PM
  #58  
BPG_Austin
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Thanks Rixter and Erkka.
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Old 03-13-2008, 12:32 PM
  #59  
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Originally Posted by Hacker-Pschorr
Upgrade or conversions?
Going from slushbox to 5-speed would be both.

I know Constantine and others have done it. I just don't remember seeing a detailed write up of the process, parts needed, and permanent changes to the car.
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Old 03-13-2008, 12:38 PM
  #60  
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Originally Posted by FlyingDog
Going from slushbox to 5-speed would be both.

I know Constantine and others have done it. I just don't remember seeing a detailed write up of the process, parts needed, and permanent changes to the car.
These are the best I could find:

https://rennlist.com/forums/928-forum/307035-s4-auto-to-manual-conversion.html

https://rennlist.com/forums/928-forum/220787-calling-auto-to-manual-conversion-masters.html

Wrong direction but right idea:
https://rennlist.com/forums/928-forum/291169-latest-project-5-speed-to-automatic-conversion.html
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