Cam & Idle, Where Are You At?
04-19-2010, 04:05 PM
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Cam & Idle, Where Are You At? I thought it would be interesting to see who has what cam and where you idle at.
I just swapped out my 228/228 563/576 on a 114 to a 233/239 596/605 on a 112. The car is fairly loppy now with the new cam. but will get more loppy because my car is idling at 1,000 RPMs. I need to go back for a retune now but was wondering what others have cam and idle wise.
Watcha Got?
I just swapped out my 228/228 563/576 on a 114 to a 233/239 596/605 on a 112. The car is fairly loppy now with the new cam. but will get more loppy because my car is idling at 1,000 RPMs. I need to go back for a retune now but was wondering what others have cam and idle wise.
Watcha Got?
04-19-2010, 10:05 PM
#4
I've got a X1 with the idle set at 900, I wish it was a little lower though. Would be cool if ya'll could post a vid to hear how your car idles too. I would but my car isn't running right now 
.
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04-20-2010, 01:09 AM
#5
I thought it would be interesting to see who has what cam and where you idle at.
I just swapped out my 228/228 563/576 on a 114 to a 233/239 596/605 on a 112. The car is fairly loppy now with the new cam. but will get more loppy because my car is idling at 1,000 RPMs. I need to go back for a retune now but was wondering what others have cam and idle wise.
Watcha Got?
I just swapped out my 228/228 563/576 on a 114 to a 233/239 596/605 on a 112. The car is fairly loppy now with the new cam. but will get more loppy because my car is idling at 1,000 RPMs. I need to go back for a retune now but was wondering what others have cam and idle wise.
Watcha Got?
221/226 .550/.575 114+1 Cam Motion currently in my RCSB @ -4.5°. Idles at 800...give or take ~15-20 rpms according to hptuners on an 87octane conservative tune.
244/248 .595/.595 115+2 Comp XE rolled over at 975rpms. Sounded sick ***** with cut outs opened at 16°. VID - https://ls1tech.com/forums/6497767-post3.html
224/230 .581/.588 114+2 Comp XER 900rpms. Pretty sleeper with -2°.
And there are many more, but the wind has changed direction and I forgot what all I have had since I am the worlds worst at keeping records other than oil change frequency.
04-20-2010, 08:00 PM
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It is idling at 1,000 right now. I'm not sure if drops once it goes into closed loop? The car now needs to be tuned since the cam is so much bigger than the last one. In addition, I had the 5.3L heads shaved by .023.
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04-20-2010, 08:09 PM
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Looks like you went from 0° overlap to 14°. Should be pretty noticeable change even at 1,000 rpm idle.
221/226 .550/.575 114+1 Cam Motion currently in my RCSB @ -4.5°. Idles at 800...give or take ~15-20 rpms according to hptuners on an 87octane conservative tune.
244/248 .595/.595 115+2 Comp XE rolled over at 975rpms. Sounded sick ***** with cut outs opened at 16°. VID - https://ls1tech.com/forums/6497767-post3.html
224/230 .581/.588 114+2 Comp XER 900rpms. Pretty sleeper with -2°.
And there are many more, but the wind has changed direction and I forgot what all I have had since I am the worlds worst at keeping records other than oil change frequency.
221/226 .550/.575 114+1 Cam Motion currently in my RCSB @ -4.5°. Idles at 800...give or take ~15-20 rpms according to hptuners on an 87octane conservative tune.
244/248 .595/.595 115+2 Comp XE rolled over at 975rpms. Sounded sick ***** with cut outs opened at 16°. VID - https://ls1tech.com/forums/6497767-post3.html
224/230 .581/.588 114+2 Comp XER 900rpms. Pretty sleeper with -2°.
And there are many more, but the wind has changed direction and I forgot what all I have had since I am the worlds worst at keeping records other than oil change frequency.
Someone calculated my overlap at 12*. Any idea on what this means for performance?
I am not sure if mine is going to hang at 1,000 or if it will drop when it goes into closed loop? How much does idle normally drop when going from open to closed loop? That is one thing I never have paid attention to?
Thanks,
Bill
04-20-2010, 09:45 PM
#9
That is lots of cams.
Someone calculated my overlap at 12*. Any idea on what this means for performance?
I am not sure if mine is going to hang at 1,000 or if it will drop when it goes into closed loop? How much does idle normally drop when going from open to closed loop? That is one thing I never have paid attention to?
Thanks,
Bill
Someone calculated my overlap at 12*. Any idea on what this means for performance?
I am not sure if mine is going to hang at 1,000 or if it will drop when it goes into closed loop? How much does idle normally drop when going from open to closed loop? That is one thing I never have paid attention to?
Thanks,
Bill
the overlap itself isnt always a bad thing...sometimes its the placement of the overlap... how much of that overlap os before topd dead center and after top dead center..
this can make a huge difference in idle quality...especially if you dont change the injector boundary to match the cam(reference to when the injector sprays fuel)..if its sprays the same as stock...you waste a lot of gas at idle and get poor efficiency as it shoots right out the still open exhaust valve
if you make the injector shoot a little later you can improve idle quality and get a better idle combustion...
I've made some pretty huge cams idle at 800rpm with no issues and yet I see people struggle sometimes with the medium cams in the 230ish range
depending on the ICL...say if its a 108 ICL..then you only have 3.5* after top dead center...
however if its a 112 ICL then you have 7.5* after TDC...
you can see where this could cause some bad idle if your injectors are firing too soon in relation to the overlap
04-21-2010, 11:27 AM
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I guess my car is not as far off as I thought. It looks like the average is about 900 rpms... I am sitting at 1,000 rpms.
I would like to see it closer to 800 so I can hear the loppy cam a little more.
I would like to see it closer to 800 so I can hear the loppy cam a little more.
