A year or so back I saw a suggested sequence for cam gear timing adjustment in a mag. The dyno shop I go to seems to just try a few different settings to see if it makes a difference.
Searching didn't turn up anything. I'm going to take the car in next mon. Anyone have the info or know where I can find it? Thanks.
(H22, stock cams, 7-16 lbs. boost)

 

Any responses?

 

I usually start with the exhaust side. I usually advance it first, and see if it picks anything up. And just try different things. Then I will move to the intake cam. I usually don't adjust the intake cam a lot at all if any. Really, there is no "set" in stone way to do it. I like to just start with the exhaust, I have had good results with adjusting the exhaust cam on a lot of setups, so naturally I go there first.

 

If turbo setup, try reducing the overlap. Good place to start. Cam tuning is crazy, can have 2 motors with same specs and everything and react diff to cam adjustments.

Anyways, i think advancing exhaust and retarding intake reduces overlap.. try that first. I might be wrong, might be other way around.

 

hey i have done alot of tuning with cam gears and i will tell you that if you are turbo then you will want to retard them Both of them! advancing them with give you more over lapping and that is very bad when your boosting! Great when your N/A but other than that NO!
Also do not forget that when you change your cam gear settings that you will need to reset your ignition timming as well
And yes every car is differant and i would suggest going about 2Deg's neg on both first and then going from there! Remember ( AEM) 1 Line is 2 deg's so 1 and 1
Hope that i helped and good luck

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blinddan &raquo;</TD></TR><TR><TD CLASS="quote">hey i have done alot of tuning with cam gears and i will tell you that if you are turbo then you will want to retard them Both of them! advancing them with give you more over lapping and that is very bad when your boosting! Great when your N/A but other than that NO!
Also do not forget that when you change your cam gear settings that you will need to reset your ignition timming as well
And yes every car is differant and i would suggest going about 2Deg's neg on both first and then going from there! Remember ( AEM) 1 Line is 2 deg's so 1 and 1
Hope that i helped and good luck</TD></TR></TABLE>

That is not ALWAYS the case. Some cars can benefit from increasing over lap even when boost. Sounds silly, but it is what some setups prefer. I would think it depends on the type of exhaust manifold for one and the flow of the head.

 

Ok well i would think that if your going to need ot over lap the valves then there is a problem with ,Turbo to big or to small..over lapping valves is going to keep more of the (Entering/ Exhausting gasses in or out!)
i have a B16 with a JDM R intake Manifold and all JDM internals in the head adn i needed to Retard them 2 Deg Each, With doing this i got 0 Lag into 3rd and 4th Gear, Useing a garrett 60/63 with a 57 trim adn a stg3 wheel with an ram horn manifold( ITs a peak boost BUT i dont like to help them out anymore) and 3 Inch from turbo back.
Yes again remember Everycar is differant and you can NOT expect to get the same results from 2 differant cars!
I set everything @ 0 and go from there, I will generally set the gears back for hi end power and foward to get more tourqe, Also to much is NOT a good thing!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blinddan &raquo;</TD></TR><TR><TD CLASS="quote">Ok well i would think that if your going to need ot over lap the valves then there is a problem with ,Turbo to big or to small..over lapping valves is going to keep more of the (Entering/ Exhausting gasses in or out!)
i have a B16 with a JDM R intake Manifold and all JDM internals in the head adn i needed to Retard them 2 Deg Each, With doing this i got 0 Lag into 3rd and 4th Gear, Useing a garrett 60/63 with a 57 trim adn a stg3 wheel with an ram horn manifold( ITs a peak boost BUT i dont like to help them out anymore) and 3 Inch from turbo back.
Yes again remember Everycar is differant and you can NOT expect to get the same results from 2 differant cars!
I set everything @ 0 and go from there, I will generally set the gears back for hi end power and foward to get more tourqe, Also to much is NOT a good thing!
</TD></TR></TABLE>

i would say your settings are right for your car because of the ram horn manifold. But with a log style, some can benefit from advance.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ella94 &raquo;</TD></TR><TR><TD CLASS="quote">Anyways, i think advancing exhaust and retarding intake reduces overlap.. try that first. I might be wrong, might be other way around.</TD></TR></TABLE>

Thats correct. The term overlap comes from the amount of time the intake valve is open before the exhaust is closed. It's done to improve exhaust gas scavaging. The more burnt gas you get out of the cylinder the more potential you have to let in fresh air. But you don't want to much overlap, cause you will just blow out the fresh charge. So the most important timing with any engine is the time when the intake valve closes. All the potential to make power is done once the intake valve closes.