Tuning vacuum secondaries

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Sep 8, 2008 | 06:53 PM

Tony238

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From: Lloydminster,Alberta

Tuning vacuum secondaries

I just bought a 570 street avenger and so far everything has been good. The only issue is at around 3500 rpm there is a pretty big hit. Is this a sign that i need to use a heavier or lighter spring?

Sep 9, 2008 | 12:08 AM

kermmydog

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From: Western Central NV

What does a big hit mean? You should not feel anything when the secondaries kick in. What kind off vehicle is this? what size engine?

Sep 9, 2008 | 11:07 PM

Tony238

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From: Lloydminster,Alberta

it is on a relatively stock 360 which is in a 76 f100 with 3.00 gears. By a hit i mean you can feel a jump around 3500 rpms.

Sep 9, 2008 | 11:57 PM

LxMan1

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From: Louisville,Ky.

If it is bogging a bit @ 3500, then it is opening too fast and a slightly heavier spring is needed.

Sep 10, 2008 | 10:51 PM

Tony238

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From: Lloydminster,Alberta

heavier spring, sweet good to know thanks all.

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