Newbie question of the day???????????

thething96 · Post by **thething96** » Wed Apr 08, 2009 1:45 pm

Hi everyone, I've gotten great response from a couple of topics I had, let's give this one a shot. What is the REAL difference between low and high cam. All I know is vtec is used for high cam, but I'm blank on all the details. What is the best way to tune on both settings. Anyone care to enlighten me please??

b20beast · Post by **b20beast** » Wed Apr 08, 2009 2:06 pm

low cam is engaged from idle - Vtec High cam is the VTEC map.

poodlemuffer · Post by **poodlemuffer** » Wed Apr 08, 2009 2:45 pm

the difference is the cam profile .high cam having higher lift and longer duration , watch this video explains it really well http://www.youtube.com/watch?v=AcT_ZyY3 ... re=related but on ectune you have a low and a high cam map, both can have different fuel and ignition values. you can select at what rpm it switches. the way i tune is i set the vtec engagement at 7000rpm then tune the low cam till 6000rpm. then set vtec to swap at 3500rpm then tune the high cam. after that do a power run with vtec low and vtec high and look at the torque curve, roughly where the lines cross each other is generally where you would set the vtec swap over. some cars can be different and like a low vtec crossover others ive seen have a bit of a dip in torque unless the vtecs high . hope that helps.

thething96 · Post by **thething96** » Wed Apr 08, 2009 3:16 pm

That really helps, but how do you set what rpm you want high cam to kick in? It's also a little tricky for newcomers like me for the fact that low cam has a wide rpm range, just like high cam. On the vtec engagement note, the better flowing exhaust, the lower vtec should be set. My type r has bolt ons only, except for a warm air intake, stock exhaust. Bone stock, vtec would start making power after 5700rpm. Ever since the electric cutout was installed, I noticed that vtec starts pulling hard after 5000. Mhhhhhhh.......

MantisX · Post by **MantisX** » Wed Apr 08, 2009 4:07 pm

Not to thread highjack, but what should be done if you car is non vtec? The same settings for both high and low? Zeroed out high map? MantisX

poodlemuffer · Post by **poodlemuffer** » Wed Apr 08, 2009 4:41 pm

thething - i usually use a dyno so i choose what rpm to crossover by looking at the datalogs and can see where the torque falls off and where torque picks up on the high cam, if your doing it on the street i normally leave it where it is stock.

Post by **Gaskleppie** » Wed Apr 08, 2009 4:55 pm

Newbie question of the day???????????

this must be the newbie question of the year.......

thething96 · Post by **thething96** » Wed Apr 08, 2009 7:10 pm

Even Nostradamus couldn't predict this question..........

thething96 · Post by **thething96** » Wed Apr 08, 2009 7:26 pm

No, but seriosly, I knew the difference between low and high cam, just thought there would be more to it. Every time there is a topic, even something as simple as an injector, there's some much info that people share in the forum. Just thought this would be the same case.