Heads/Cam idle question

Stdyhand · May 12th, 2011, 03:41 AM

Will a higher lift/duration cam always result in a rougher idle or will it depend on how well the heads flow?

This is probably a horrible example, but would a TFS stage 2 cam result in a rougher idle with AFR 165's vs. higher flowing 185's or would the idle be the same despite the flow of the heads?

The reason I ask is because a guy I work with wants to run a set of GT40p heads with a higher lift cam, not necessairly a TFS 2 cam.

He is aware he can get a set of TFS springs to run a higher lift, but supposing he upgrades later to aluminum heads which flow better will it result in a smoother idle or would he still keep the lopey idle he is aiming for now?

Also will he need any fuel mods with the gt40p heads and will the cam he chooses dictate his ignition timing?

LSX Freak · May 12th, 2011, 03:52 AM

Should keep the lopey idle.

Iwannagofast · May 12th, 2011, 11:13 PM

with gt40p's and a cam and intake to match id probly go ahead and step up to 24 lb injectors

93hatch · May 12th, 2011, 11:15 PM

bigger heads=overall louder car. My afr headed car with a mac catback sounded like dogshit, didnt sound too bad when the car was stock

May 12th, 2011, 03:41 AM	#1
Stdyhand Regular 1991 Ford Mustang GT Join Date: Apr 2011 Location: Missouri Posts: 213 iTrader: 0 reviews	Heads/Cam idle question Will a higher lift/duration cam always result in a rougher idle or will it depend on how well the heads flow? This is probably a horrible example, but would a TFS stage 2 cam result in a rougher idle with AFR 165's vs. higher flowing 185's or would the idle be the same despite the flow of the heads? The reason I ask is because a guy I work with wants to run a set of GT40p heads with a higher lift cam, not necessairly a TFS 2 cam. He is aware he can get a set of TFS springs to run a higher lift, but supposing he upgrades later to aluminum heads which flow better will it result in a smoother idle or would he still keep the lopey idle he is aiming for now? Also will he need any fuel mods with the gt40p heads and will the cam he chooses dictate his ignition timing?

May 12th, 2011, 03:52 AM	#2
LSX Freak Enthusiast Canary yellow 1990 GT Praying for 11's after winter mods Join Date: Apr 2011 Location: Moberly, Missouri Posts: 539 iTrader: 0 reviews	Should keep the lopey idle. __________________ -Edelbrock Performer Intake/Heads -TFS2 Cam -Tremec 3550 -All them other bolt on performance thingys

May 12th, 2011, 11:15 PM	#4
93hatch Banned 1992 Lx 11.39@119.24 Join Date: Jan 2008 Location: Az Posts: 11,644 iTrader: 0 reviews	bigger heads=overall louder car. My afr headed car with a mac catback sounded like dogshit, didnt sound too bad when the car was stock __________________ [QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]

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