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Unread 10-16-2013, 11:55 AM   #1
CoryA
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1977 CJ7 
 
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Holley 390 Secondary Spring

Hello,

I noticed my secondarys looked dusty and dirty so I thought my secondaries weren't kicking in I tried the paper clip test and sure enough they weren't. I went ahead and ordered a new diaphragm and a quick change kit for secondary spring

Just wondering what your all are running for a secondary spring?

My current setup is a 258 team rushed offy intake Headers msd 6a

T5 and 5.38's

Thanks,
Cory

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Unread 10-17-2013, 05:19 AM   #2
2Xtreme
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Holley 390 uses vacuum secondary....
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Unread 10-17-2013, 06:06 AM   #3
Matt1981CJ7
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Quote:
Originally Posted by 2Xtreme View Post
Holley 390 uses vacuum secondary....
True, but the secondary diaphragm still has a spring.

Cory, I'd start out with the lightest spring in the kit, then follow the tuning procedure, found here.

Matt
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Unread 10-17-2013, 06:38 AM   #4
BESRK
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I've always just started with the stock spring (I think it's usually the Plain Steel one?), and go lighter one step at a time until I'd induce a bog due to opening the secondaries too fast. Then, I'd go back up a color to get rid of the bog.

Last several years, I've had FI, so I've gotten kind of rusty with my "carb tuning"..
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Unread 10-17-2013, 08:55 AM   #5
CoryA
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Nice thanks guys! That PDF is really helpful I got the quick change diaphragm housing so it should hopefully be pretty easy to swap between springs. I think I'll start with the lightest spring just to make the bog obvious so I know what in looking for then start from the stiffer springs and work my way down to find the bog Everything should be coming in tonight so I'll post up tomorrow what spring worked best for me

Originally wanted to go fuel injection Eddie but I figured engine runs well might as well work with what I have. Fuel injection would be great.
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Unread 10-18-2013, 10:14 AM   #6
2Xtreme
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Quote:
Originally Posted by Matt1981CJ7 View Post
True, but the secondary diaphragm still has a spring...
That would be why I didn't understand what he meant by the 'paper clip test'.... lol
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