how would drivability be on the -2* everyday?

 

It'll behave just fine and have a smoother idle and part throttle character. It'll just tend to make less torque in the midrange and delay spool a bit.

 

One thing I'm not totally sure is at what crank degrees (mivec map input) does 0* overlap appear to be on my cams . I've seen estimated 14-19 in various discussions. Is it simple math or very complex to figure this out?

 

According to my own brief calculations GSC S2 will have 0* of overlap (speaking of effective duration of 230* at 1mm of lift) at mivec settings of 14* in the table.

 

Biggy's calculations are more or less correct.

GSC S2 Exh has a LC of 113 BTDC and an effective duration (@1mm) of 230. That means the effective Exh closing point is 2 deg ATDC.

GSC S2 Int (IX) has an LC of 128 ATDC and an effective duration (@1mm) of 226. That means the effective Int opening point is 15 ATDC at the zero position, which in turn means that overlap begins at 13 degrees of advance.

 

Again thanks for the help fellas. would it be ok that I quote and repost your guys information in the tuning ecuflash forum > mivec tuning, do that other ls can use it on that end when they search? With a link to this thread.

 

what kindof setup would i be looking at? earlier spool and better idle.

2.0l 4g63 EVO 6
Kelford 272s
Kinugawa TD06 25g
KVS63 Valve Springs

Thanks

 

You can try advancing the intake cam 1 or 2 degrees.

 

But idle won't become any better.. Actually it will be a little worse.

 

Yes Biggy, you are correct. He should try +1/+2.

My brain isn't working yet. I need coffee.

 

Thanks. Will try it later

 

Was hoping to get settings for my cams. I have a 2.4 running an EF3 turbo with HKS 274/278 cams on HKS springs and Ti retainers. I just finished the build have it set at 0/0 but was hoping to get better guidance on an appropriate setting. Oh and it's and VIII. Thanks in advance

 

I haven't seen a cam card for the HKS Step 2 274/278 cams. Do you have them? I need to know the lobe centerline of those cams. They may be the same 110 deg LCs as the earlier cams, but I don't want to make assumptions.

 

Thanks for the response. After a little digging on HKS-power.co.jp and found that it is 110 degrees designed valve timing. Hopefully that is what you are looking for

 

That's what I would have guessed knowing HKS, but I don't like guessing. What length connecting rod in your 2.4?