GSC S2 Cam Settings
Thread Starter
Newbie
Joined: Sep 2008
Posts: 54
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From: Australia
GSC S2 Cam Settings
Hey guys and girls ,
Was just after some advice as to what settings will work best when dialling in the cam gears for my setup . Ive got the GSC S2 cams with a built 2L and a 35R combo. Race ported head etc and all other required supporting mods .
My question is what setting should i dial in the cams to achieve all top end, and how much lag am i giving up ? And is there a setting that may work better up top (extra hp) without sacrificing as much down low ?
Any help is greatly appreciated so thanks in advance
Cheers
Was just after some advice as to what settings will work best when dialling in the cam gears for my setup . Ive got the GSC S2 cams with a built 2L and a 35R combo. Race ported head etc and all other required supporting mods .
My question is what setting should i dial in the cams to achieve all top end, and how much lag am i giving up ? And is there a setting that may work better up top (extra hp) without sacrificing as much down low ?
Any help is greatly appreciated so thanks in advance
Cheers
I havent played around with them much to be honest. On the VIIIs we leave them pretty much straight up and go from there. The sister car to mine (all mods except its an VIII) has an almost identical powerband, makes the same power and torque, and I am using MIVEC. I only beat him in the spool dept.
with stock head,intake manifold,throttle, a gt35 and 2 hours of dyno playing with cams,the best setting for me was stock marks and the car pulled 628hp at 35psi with 100%meth and incredible power band, i love these cams and only cams i will use.looking to use them with toyota 3sgte and some 4g63 early engines.
Taken from Pro Street Online: http://my.prostreetonline.com/forums...read.php?t=117
How to Tune Cam Gears on a 4g63t
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This article assumes that you have a clear understanding of what cam gears are and that you have at least one of them installed. Keep in mind that your modifications (turbo, fuel setup, etc.) might yield different results for your application. Use the explanation below to experiment with your cam gear settings but we HIGHLY advise not exceeding 5 degrees in either direction, advance or retard. As with all of our tech tips and how tos, You should have a certified mechanic working on your car, or if you wish to do yourself, Pro Street Industries is not responsible for the modifications you perform on your own vehicle.
On the 4g63 DOHC engine you can dial-in intake and exhaust timing independently of each other to regulate overlap. As you'll start to see as you make changes, combined with the use of a chassis dyno (highly recommended) you can fine-tune your cam's entire operation by advancing or retarding its action, squeezing as much horsepower and torque from your state-of-tune as possible.
It's important to note that adjustable cam gears have no direct effect on the duration and lift of the valves, that's the job of the camshaft lobes (profile) as dictated by the cam manufacturer.
*TIP - Always make sure your cam gears are tightened correctly to combat cam gear slippage. Slippage refers to the bolts that hold your cam gear to the settings you desire loosening up and allowing the cam timing to advance or retard fully often with catastrophic results. DO NOT LET THIS HAPPEN TO YOU. And not to state the obvious, but... make sure your car is in tip-top working order before you adjust your cam gears.
Generally, advancing a cam gear opens a valve sooner, and closes it sooner... retarding the cam gear, opens the valve later, and closes it later... since all you've done is "move" the fixed event.
Advancing Intake and Exhaust : This will provide the car with more bottom end power, and will decrease top end. Advancing both cam gears will move overlap earlier but will not increase it.
Retarding Intake and Exhaust : This will increase the cars top end, but will decrease low end. Retarding both cam gears will move the overlap later and but will not change the amount of overlap.
Advance Exhaust Only : This will help the cars top end, and it reduces overlap.
Retard Exhaust only : This will help the cars mid range power, very useful for cars with big turbos / big cams. By increasing overlap, It decreases lag significantly. Doing this will bring the boost on all at once. Very common DSM modification.
Advance Intake only : This will increase overlap and helps the cars bottom end and mid range power. This mod will bring the turbo on all at once, although isnt a very common mod for DSMS.
--------------------------------------------------------------------------------
This article assumes that you have a clear understanding of what cam gears are and that you have at least one of them installed. Keep in mind that your modifications (turbo, fuel setup, etc.) might yield different results for your application. Use the explanation below to experiment with your cam gear settings but we HIGHLY advise not exceeding 5 degrees in either direction, advance or retard. As with all of our tech tips and how tos, You should have a certified mechanic working on your car, or if you wish to do yourself, Pro Street Industries is not responsible for the modifications you perform on your own vehicle.
On the 4g63 DOHC engine you can dial-in intake and exhaust timing independently of each other to regulate overlap. As you'll start to see as you make changes, combined with the use of a chassis dyno (highly recommended) you can fine-tune your cam's entire operation by advancing or retarding its action, squeezing as much horsepower and torque from your state-of-tune as possible.
It's important to note that adjustable cam gears have no direct effect on the duration and lift of the valves, that's the job of the camshaft lobes (profile) as dictated by the cam manufacturer.
*TIP - Always make sure your cam gears are tightened correctly to combat cam gear slippage. Slippage refers to the bolts that hold your cam gear to the settings you desire loosening up and allowing the cam timing to advance or retard fully often with catastrophic results. DO NOT LET THIS HAPPEN TO YOU. And not to state the obvious, but... make sure your car is in tip-top working order before you adjust your cam gears.
Generally, advancing a cam gear opens a valve sooner, and closes it sooner... retarding the cam gear, opens the valve later, and closes it later... since all you've done is "move" the fixed event.
Advancing Intake and Exhaust : This will provide the car with more bottom end power, and will decrease top end. Advancing both cam gears will move overlap earlier but will not increase it.
Retarding Intake and Exhaust : This will increase the cars top end, but will decrease low end. Retarding both cam gears will move the overlap later and but will not change the amount of overlap.
Advance Exhaust Only : This will help the cars top end, and it reduces overlap.
Retard Exhaust only : This will help the cars mid range power, very useful for cars with big turbos / big cams. By increasing overlap, It decreases lag significantly. Doing this will bring the boost on all at once. Very common DSM modification.
Advance Intake only : This will increase overlap and helps the cars bottom end and mid range power. This mod will bring the turbo on all at once, although isnt a very common mod for DSMS.
Thread Starter
Newbie
Joined: Sep 2008
Posts: 54
Likes: 0
From: Australia
have read that info already 
cheers for the replies guys . Ive currently got them dialled into 0,0 and the power isnt that great . Im getting a Wilson V2 and 70mm TB put on before the tune tonight and have heard guys making insane increases by just changing the gear dials a bit .
Any more info at all ? Is there a specific number GSC thinks they work best on ??
Cheers
cheers for the replies guys . Ive currently got them dialled into 0,0 and the power isnt that great . Im getting a Wilson V2 and 70mm TB put on before the tune tonight and have heard guys making insane increases by just changing the gear dials a bit .
Any more info at all ? Is there a specific number GSC thinks they work best on ??
Cheers
The GSC S2s are ground at 107/113, and give a long 236deg @ 1mm of effective duration.
For most applications, I would leave them right where they are. For large turbo, high rpm drag setups with CNC ported heads, the only thing I might suggest is retarding the exhaust cam 1 degree.
For most applications, I would leave them right where they are. For large turbo, high rpm drag setups with CNC ported heads, the only thing I might suggest is retarding the exhaust cam 1 degree.
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From: CHICAGO!!!
Hey guys and girls ,
Was just after some advice as to what settings will work best when dialling in the cam gears for my setup . Ive got the GSC S2 cams with a built 2L and a 35R combo. Race ported head etc and all other required supporting mods .
My question is what setting should i dial in the cams to achieve all top end, and how much lag am i giving up ? And is there a setting that may work better up top (extra hp) without sacrificing as much down low ?
Any help is greatly appreciated so thanks in advance
Cheers
Was just after some advice as to what settings will work best when dialling in the cam gears for my setup . Ive got the GSC S2 cams with a built 2L and a 35R combo. Race ported head etc and all other required supporting mods .
My question is what setting should i dial in the cams to achieve all top end, and how much lag am i giving up ? And is there a setting that may work better up top (extra hp) without sacrificing as much down low ?
Any help is greatly appreciated so thanks in advance
Cheers
http://www.youtube.com/watch?v=Jpafx9Y2aLw
Mods are:
GSC S2 cams
titanium springs and retainers
HTA GT3586 turbo
stock 2.0 4g63
on 93 octane and 24 PSI
428 HP
