Idle Quality October 07, 2015, 12:44:57 PM So I've got a trick-flow trackMAX stage 1 cam, like some of you guys, and I'm wondering what your idle is like. Mine is somewhat rough and a little lopey. I'm trying to decide if it's a characteristic of the cam, or if I've got some sort of problem. Quote Selected
Idle Quality Reply #1 – October 07, 2015, 06:30:37 PM Quote from: TheFoeYouKnow;451645So I've got a trick-flow trackMAX stage 1 cam, like some of you guys, and I'm wondering what your idle is like. Mine is somewhat rough and a little lopey. I'm trying to decide if it's a characteristic of the cam, or if I've got some sort of problem.Totally normal...It won't be happy till you bring up the in gear idle to around 850-900 RPMs... Quote Selected
Idle Quality Reply #2 – October 07, 2015, 07:32:54 PM Yeah you're going to want to up the idle in the 850rpm range in drive. Any idea how much vacuum the engine has? The cam specs out as follows:Duration at 050 inch Lift: 221 int./225 exh.Valve Lift with Factory Rocker Arm Ratio: 0.499 int./0.510 exhI would think it should make around 14" or so of vacuum at hot idle. For example here are the specs on the cam in my Thunderbird:Duration at 050 inch Lift: 210 int./215 exh.Valve Lift with Factory Rocker Arm Ratio: 0.533 int./0.533 exh.About 10* less duration on the intake/exhaust side but much more lift. Idles great with a slight lope at 650rpm in drive and 700rpm in park. It has 17" of vacuum at hot idle. Quote Selected
Idle Quality Reply #3 – October 07, 2015, 08:25:50 PM I'll get my laptop out and try that tomorrow. The duration will have a noticeable effect on vacuum. When I get the chance, I'll measure it. Quote Selected
Idle Quality Reply #4 – October 29, 2015, 10:48:23 PM Raised the idle a couple weeks ago, God I really love tuning with a Quarterhorse and TunerproRT. Idle is smoother, I lowered back down some and settled on a target RPM of 825. Raising the idle actually increased my vacuum to about 14 inches, which among other things, has my brake booster somewhat happier. Thanks for the help, I still have to get on a dyno for tuning, but my street tuning is good enough to wait for next summer. Quote Selected
Idle Quality Reply #5 – October 30, 2015, 11:46:38 AM Glad to hear it worked out!I still have to tune mine. I know there is probably 10-20hp that can be unlocked with a tune. The thing just runs so well that I really haven't been in a hurry to spend the cash to tune it. Quote Selected
Topic: Idle Quality (Read 2255 times)
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