Adjusting the cams as such allowed me to run the bone stock idle setup, with no adjustments. It can vary a little, but during the cold months it was 750-800. With HKS 264's and no cam adjustment it was more like 600-700.Just following up on this terrific thread - I've got a few questions!
First, from Al, what is your idle rpm? I have GSC S1s and a ported head and at around 950rpm, am seeing ~12inHg. These are with my cam gears set to zero. I'm assuming here that idle vacumn drawn correlates with idle rpm, but am happy to be corrected on that. If it does - is my idle vacumn acceptable for this rpm, or would there be gains to be had by retarding the ex cam/advancing the inlet?
My second question was (to Alpha/Al/Eden), given that ignition timing advance is linked to the inlet cam - did you advance the ignition timing across the board by 2deg for each 1 degree of inlet cam retard to compensate, or did you leave timing untouched?
Thanks for your input
Of course, my bad for writing e-mails at work ... I meant to say ex cam advance and inlet cam retard. Thanks for the advice, I'll start with those settings and see how I goYou are going to want to advance the exh cam and retard the intake cam. Start with +2 exh, then try -2 intake, that will get you most of the way there. Mine is +5,-2, and Tayousei's +5,-4 works well also.
Idle emissions did not improve much with degree'ing the cams, still reeks really bad!
So I assume you liked the results I'm going to try messing with this, too....fantastic...phenomenal...45lb-feet of torque where it matters (both down low and at peak) and more torque everywhere; and 40rwhp more peak power in addition to more power everywhere...on-road difference is fabulous...very worthwhile exercise overall...
i still need to degree my cams, while idling im only getting about 10 inHG. and when the car is fully warmed up, it stalls.Although mine are S2's after the talking with Greg and having the it degree'd according to the card this is what the results looked like on the cam gears.
With only 10hg of vacuum, the idle will need turned up to provide enough air to keep the engine running, or increase the vacuum with the cam settings instead.no im using AEM V1 thats tuned for my old setup. i know i need to get it tuned as well. but it should still run the engine.
now you read it wrong smaay, the ex cam in picture on this page the "Rocketman1000R picture" of the hks gears is retarded not advance, i think its tricky for some ppl to read different cam gear labels right cuz if the adv/retd marks are on the inner section of the gear or outer section,Smaay, that ex cam is advanced. I'm not sure why the gears are labelled like that in the pic, but as we established in this thread, http://www.supraforums.com/forum/showthread.php?693663-Retard-and-advance-timing-question that direction is definitely advanced.
Apparently you dont have to. A while back i read that for us 2jz guys, the crank sensor is responsible for timing and the inlet cam sensor is just referenced for where you are in the cycle. Maybe someone can confirm that before people go out and mess with their timing tables.Keep in mind that after adjusting the intake cam you have to reset your ignition timing.