Lost 3 rwhp changing to a bigger cam?
Thread Starter
Staging Lane
Joined: Dec 2002
Posts: 57
Likes: 0
From: Dallas Tx
Lost 3 rwhp changing to a bigger cam? Ok, I was running a 216/220 .525 .532 on a 114 with my 1.8 rockers and I changed to a 224/224 .563 .563 114 cam with the 1.8 rockers and lost 3rwhp up top. I did pickup HP from 3500-4400 then it mirrored my previous cam. Air fuel was 12.8 to 1 across the board.
I am thinking my cats my be screwed, hell I cant explain why I did not pick up any top end.
Any suggestions?
I am thinking my cats my be screwed, hell I cant explain why I did not pick up any top end.
Any suggestions?
Last edited by cscollis; Nov 26, 2003 at 10:33 AM.
TECH Junkie
Joined: Nov 2001
Posts: 3,604
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From: Los Angeles
Back when I had some crappy heads, I could put in all sorts of huge cams and I never gained rwhp. At the time, I didnt have the facilities to re-tune after each one. I imagine if you could tune your car, the bigger one would probably make a bit more.
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With retune you might gain some.
I didn't think 1.8 rockers were recommend for cams with ~.560+ lift...but I could be wrong.
I don't think the stock heads are going to gain much with even more lift. Seems like its time for heads to me.
I didn't think 1.8 rockers were recommend for cams with ~.560+ lift...but I could be wrong.
I don't think the stock heads are going to gain much with even more lift. Seems like its time for heads to me.
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10 Second Club
Joined: Jun 2002
Posts: 1,884
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From: H-town
i would also bet on the 1.8 rockers. i never liked going with a higher ratio then stock. if i wanted more lift i would just pick a different cam. put on the stockers, get it tuned and get another dyno run on it. then let us know.
Originally Posted by JoeDirt
Isnt that WAY too much lift for stock heads anyways ??
. Go back to 1.7's , good springs, Tit. retainers and hard prods then tune. You'll be amazed. 
!LS1 11 Second Club
Joined: Apr 2003
Posts: 7,133
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From: Miami
I'm not sure if the overall lift values are so much the culprit here, just that the TR224's aggressive ramp rates are not supposed to be used with 1.8 rockers, as per TR's website. The thing is that to begin with, we don't know if he's running a TR cam, or simply a cam with similar specs.
The TSP 231/237 I use has .598/.595 lift values, but with a bit less aggressive ramp rate. It runs fine on stock heads and Comp 918s.
The TSP 231/237 I use has .598/.595 lift values, but with a bit less aggressive ramp rate. It runs fine on stock heads and Comp 918s.
In most cases the 224/.561 lift cam is the comp XE lobe. 224/.581 is the XE-r. I agree that the 1.8's are throwing things out of wack. If the 224 cam needed .596 lift, they would've ground it that way. Check the spring pressures and put the 1.7's back on.