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04-19-2003, 06:14 PM
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#1 |
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Registered User
Join Date: May 2002
Location: Woodstock, GA USA
Posts: 300
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RPM Question
When I put the truck in gear the tach drops 500 to 600 RPM. What would cause this much of a drop? I have to idle at 1200 in order for it to run in drive. I am running a ZZ502 that has a pretty lumpy cam. Is this normal?
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Bill Durham http://home.attbi.com/~bulldurham 72 Cheyenne Restoration in progress Currently: frame sand blasted and powdercoated, Inline Tube brake and fuel lines, Blazer tank in rear, Holley Red electronic fuel pump, Eaton posi with 3.42 gears, 2 1/2" drop front spindles, 4" drop rear springs with adjustable panhard bar, KYB shocks, ZZ 502/502 GM Performance crate engine, Zoops brackets and pulleys, Vintage Air, dual electric fans, Ram Air II hood and late model sport side bed. |
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04-19-2003, 06:22 PM
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#2 |
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Used to have a truck
Join Date: May 2002
Location: port orchard WA
Posts: 1,552
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Thats normal with a big cam. A higher stall converter will take care of that problem.
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No truck :-( |
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04-19-2003, 06:52 PM
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#3 |
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Registered User
Join Date: May 2002
Location: Woodstock, GA USA
Posts: 300
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What stall should I run with this engine? I have 3.42 gears.
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Bill Durham http://home.attbi.com/~bulldurham 72 Cheyenne Restoration in progress Currently: frame sand blasted and powdercoated, Inline Tube brake and fuel lines, Blazer tank in rear, Holley Red electronic fuel pump, Eaton posi with 3.42 gears, 2 1/2" drop front spindles, 4" drop rear springs with adjustable panhard bar, KYB shocks, ZZ 502/502 GM Performance crate engine, Zoops brackets and pulleys, Vintage Air, dual electric fans, Ram Air II hood and late model sport side bed. |
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04-19-2003, 07:42 PM
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#4 |
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Used to have a truck
Join Date: May 2002
Location: port orchard WA
Posts: 1,552
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Youve got a huge amount of torque with that thing. You really dont need much above 2500 stall speed. Stock being more like 1600 or less. I think I'd look at the B&M nitrous holeshot 2400 . Your'e going to want a quality unit for that BIG big block and the nitrous holeshot should handle the extra power . It also has an anti baloon plate. Summit has them for $309 PN# BMM-20480
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No truck :-( |
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04-19-2003, 08:12 PM
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#5 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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Just make sure your cruising RPM is higher than your stall. If you don't, you'll burn up your tranny in short order.
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