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Re: Question on 6 Pack Vaccuum requirement [Re: scrag] #1484999
08/16/13 09:51 PM
08/16/13 09:51 PM
Joined: Aug 2003
Posts: 2,482
Answering the call of the wild
T
ThermoQuad Offline
top fuel
ThermoQuad  Offline
top fuel
T

Joined: Aug 2003
Posts: 2,482
Answering the call of the wild
Your initial timing should be 18 and for total try 34. Try heavier secondary springs as well...you might be surprised. If you read the guide it says to start with black springs.

A pcv oil separator - that's a mustang part - makes a difference as well. Oil in the mixture causes detonation at high rpm which is difficult to hear

Re: Question on 6 Pack Vaccuum requirement [Re: ThermoQuad] #1485000
08/18/13 02:58 PM
08/18/13 02:58 PM
Joined: May 2005
Posts: 476
Mount Airy, Maryland
S
scrag Offline OP
mopar
scrag  Offline OP
mopar
S

Joined: May 2005
Posts: 476
Mount Airy, Maryland
Thanks Everyone - lots of good info and I am looking for forward to getting the part (due Monday)...I need to to get a couple more....what was the part number for advance? Grease on the screws....sometimes you read something like that and do the face palm - thanks -regarding the springs I will go back to see the color - I know that kick when the secondaries come in is actually a flat spot and a sign for a lighter spring - I was told smooth is the word when it comes to secondary operation....

Re: Question on 6 Pack Vaccuum requirement [Re: scrag] #1485001
08/18/13 06:26 PM
08/18/13 06:26 PM
Joined: Oct 2003
Posts: 2,537
PORT ALBERNI , BC., CANADA
superwrench Offline
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superwrench  Offline
master

Joined: Oct 2003
Posts: 2,537
PORT ALBERNI , BC., CANADA
I got the purples in my race car.....with the 4600 convertor I don't feel a thing... except brutal toque.....My car will actually slow down with the short yellows. Just keep the initial timing up at 16 or better....you'll love it!!

Re: Question on 6 Pack Vaccuum requirement [Re: scrag] #1485002
08/18/13 08:39 PM
08/18/13 08:39 PM
Joined: Feb 2005
Posts: 4,333
Prospect, PA
BSB67 Offline
master
BSB67  Offline
master

Joined: Feb 2005
Posts: 4,333
Prospect, PA
Quote:

... I was told smooth is the word when it comes to secondary operation....




You were told wrong. If you are trying to maximize performance, you can only determine the best spring at the track. The springs that generate the lowest et, best mph, may, or may not be smooth on the street. Weight, gear, and converter play a key role in what springs are best, and whether or not there will be a sag when they come-in on the street.

Re: Question on 6 Pack Vaccuum requirement [Re: BSB67] #1485003
08/18/13 09:25 PM
08/18/13 09:25 PM
Joined: Jun 2008
Posts: 3,916
usa
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lewtot184 Offline
master
lewtot184  Offline
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Joined: Jun 2008
Posts: 3,916
usa
Quote:

Quote:

... I was told smooth is the word when it comes to secondary operation....




You were told wrong. If you are trying to maximize performance, you can only determine the best spring at the track. The springs that generate the lowest et, best mph, may, or may not be smooth on the street. Weight, gear, and converter play a key role in what springs are best, and whether or not there will be a sag when they come-in on the street.


what BSB67 says is fact. as far as the short yellows slowing a car down; the short yellows actually have a slower opening rate than the long yellows. this is per holley's info. i don't know why they even marketed them. i use purples for street use but yellows go quicker. from a standing start you won't feel any soggy spots, like from a kickdown, with softer springs. anything heavier than purples is worthless.

Re: Question on 6 Pack Vaccuum requirement [Re: lewtot184] #1485004
08/24/13 04:50 PM
08/24/13 04:50 PM
Joined: May 2005
Posts: 476
Mount Airy, Maryland
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scrag Offline OP
mopar
scrag  Offline OP
mopar
S

Joined: May 2005
Posts: 476
Mount Airy, Maryland
Many thanks to all - here is an update - I went with the short yellow springs when I replaced the diaphragm.....I am really stoked as the neck snap is back as is the smile. Thanks!

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