Dyno questions with 224 cam
this thread is scarey interesting to me. let me explian. first i'm having a similar problem w/ my car. it's got TR stage II'2 w/ dual coil springs. it HAD the tr224/ 114 in it. the best numbers i made with it were 390 rwhp and 368 rwtq, and it peaked at 6100 rpm. after going back and forth w/ the folks at thunder racing, we decided to try a differant cam, thinking the the old 224 had to much advance ground in when it was made. so we tried that TR227/224 114- i think they call it the reverse split cam. anyway, after some slight a/f tuning and pulling a couple of degrees timing out of it it made 405rwhp and 374 rwtq. it peaked again- at 6100 rpm and started to roll over after that. basically the car is making the rwhp it's supposed to, but the torque #'s are slightly low and it doesn't pull up to 6500rpm like it's supposed to. this is what is bothering the guys at thunder. so now they are thinking my pushrods they sold me are to long and are might be holding the valves open at high rpm, keeping it from pulling any harder. so they want me to check the lifter preload. fortunately i'm a mechanic at a pontiac dealer so all the installs and checks can be made at work. i do however understand any frustartion from the guys at thunder, 'cuz they don't have the car there to look at, we are doing this all by the phone. the car is an '02 ws6 that has kooks LT's, corsa cat-back, lid, filter, 4:10 gears with an m6 trans.
This is what is involved in degreeing a camshaft, it is a percise setting, you match it to the cam card look at these;
www.geocities.com/cambusters_detroit/camdegree.htm
www.hotrodder.com/kwkride/degree.html
Then for lingo & general info look at this;
www.compcams.com/Technical/TimingTutorial/
www.geocities.com/cambusters_detroit/camdegree.htm
www.hotrodder.com/kwkride/degree.html
Then for lingo & general info look at this;
www.compcams.com/Technical/TimingTutorial/
Last edited by wrencher; Jan 25, 2004 at 05:24 PM.
Originally Posted by HC02SS
Here is a dyno from my buddies car. It has a TR224 114lsa, m6, LTs, intake, borla, lid. This dyno to me seems kinda LOW.

Can someone also tell me why that HP and TQ don't cross at 5200 rpms?

Can someone also tell me why that HP and TQ don't cross at 5200 rpms?
and something is way off, that is not sposed to peak at 5600 and then fall off.
as the other guy found out its probably not degreed right. the 224 should peak at 6100-6300 and maintain power to 6600 or so.
are you swapping cams cuz this one has low numbers?
are you swapping cams cuz this one has low numbers?
Originally Posted by HC02SS
That is the main reason. He also wanted to go to a larger cam. We'll find out when we do the swap. I bet it is degreed properly actually. I dunno.



