Provided the weather is nice, I will be running my car at the track this Friday for my b-day.

The other day I adjusted my cams gears because the setting on the exhaust cam seemed to skew from the original setting.

The car seemed to be VERY torquey before I adjusted it, but lacked/lost some power on the top-end after about 4-4500rpm.

My questions are:

What settings have any of you had success with? Care to share?

At about what point in the cam gear setting range would a piston meet a valve?
(Obviously DONT WANT THAT TO HAPPEN)

BTW: I have 8.6:1 pistons and Crane # 14 turbo-grind cams.

Thanks

Jonathan
95 Eclipse GS
8 injector
Hahn Stage 3.5
Howell 2.2L Stroker

T O T A L L E D, T H A N K S T O S O M E A S S H A T!!!!!!!!!!!!

The only thing you can really try with them cams unless you put it on a dyno, is put the exhaust to -2 degrees. I had them cams and reall didnt get anything outta them.

You are turbo, right?

With the dish pistons and small exhaust cam, you could go a long way with it. I had the 14's and retarded mine as much as -6*. If you retard only the exhaust cam, you're gonna increase your overlap, which isn't what you want when boosted.

Play with it, you're going to the track. Run 2/3 runs each at 0/0 (exh/int), then at -2/0, -2/-2, -4/-2, etc. After you adjust them, turn the motor over with a wrench to see if it spins freely. You should fine, but check it just in case. To make it easier to turn, you could pull your plugs as well.

~Luke
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1969 Cougar - 11.91 - 380HP
2007 GSXR 750
1999 OZ - SOLD - 15.26 NA - 14.71 on 75 shot

be careful adjusting your exhaust cam too much as thats where the cam sensor magnet resides... There was discussion about it throwing a wrench into all sorts of things with timing etc.

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Built. That's All...
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www.monkeybuttpirate.com
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2 Fingers of Scotch with a milk back... Stat!

~Luke
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1969 Cougar - 11.91 - 380HP
2007 GSXR 750
1999 OZ - SOLD - 15.26 NA - 14.71 on 75 shot

Thanks for the help so far. I adjusted the exhaust cam back to what is/close to 0/0 (exh/int) and seemed to have lost power and torque.

As far as turning the engine over manually, thats what I did thinking that if it stopped, then something wasnt right. Glad to hear I did that properly. THANKS.

So if I dont want overlap, then I should change the intake setting as much as the exhaust setting? Am I understanding you correctly?

Thanks

Jonathan
95 Eclipse GS
8 injector
Hahn Stage 3.5
Howell 2.2L Stroker

T O T A L L E D, T H A N K S T O S O M E A S S H A T!!!!!!!!!!!!

The camshaft angle sensor doesn't have nearly the resolution that the crank angle sensor has, i.e. it isn't as important in the timing calculation as the crank angle sensor is. I'm willing to bet you can play with it a lot before it will throw a check engine light for crank/cam out of time. I ran something like -3 on the intake and +3 on the exhaust at one point, and I never got a CEL or noticed anything else strange.

After you change the angle of the exhaust cam check the spark advance with an OBD2 datalogger vs. no adjustments. I'm interested to see if 2-3 degrees of error would actually do anything in regards to ignition. With regards to fuel, having the injector fire in error by a few degrees will probably do nothing.

2016 WRX STi Limited (current)
2001 A4 1.8tqms (donated)
1991 GVR4 #1933 (sold)
old.dsmregistry.com/detail.php?carid=218 (dismantled)

Huh, I learned something today, lol.

~Luke
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1969 Cougar - 11.91 - 380HP
2007 GSXR 750
1999 OZ - SOLD - 15.26 NA - 14.71 on 75 shot

Thanks guys, you are the best!!! I will see what goes down at the track this Fri and share regardless of the outcome of my driving and/or the car.

Thanks again
Jon

Jonathan
95 Eclipse GS
8 injector
Hahn Stage 3.5
Howell 2.2L Stroker

T O T A L L E D, T H A N K S T O S O M E A S S H A T!!!!!!!!!!!!

ummm, when you create more overlap, you are pulling more mixture mass into the cylinder, but are inevitably blowing some fresh charge straight into the exhaust, right? So wouldn't the O2 sensor pick this up and tell the ECU the car is running rich, subsequently leaning out the mixture and negating any gains you got by creating the overlap in the first place? I was intrigued by the concept of the cam gear adjustment, and when I started thinking about why the engineers wouldn't do it in the first place, this is what I came up with (along with maybe poor gas mileage)
-Or is this a track only trick, where you adjust the cam gear for one run and the ECU doesn't have enough time to adjust the mixture.
-Or can you pull this off all the time if you have a standalone engine management system?
Please cure my ignorance.

Proud owner of a '95. Johnny Tran says the '95 VTEC just kicked in, yo.


RICE: AEM Short Ram, CI 55mm Throttle Body, GS-T Muffler, Self-Made Ground Wire Kit, Caulk, Duct Tape,
and "Stage 1 Weight Reduction" aka screws and bolts always left over from working on car.

~Luke
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1969 Cougar - 11.91 - 380HP
2007 GSXR 750
1999 OZ - SOLD - 15.26 NA - 14.71 on 75 shot