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-   -   Need Some Help/Opinions Please (https://www.camaroz28.com/forums/lt1-based-engine-tech-9/need-some-help-opinions-please-180493/)

whontime 10-12-2003 06:52 PM

Need Some Help/Opinions Please
 
Ok, I posted my dyno graphs on Friday along with my results. The dyno graph showed a fall off around 5,000 rpm with zig zagging. I had been noticing that the car hadn't been "feeling" right between 2,000-3,000 rpm under light/normal accleration. When going at WOT the car feels great and pulls strong all the way to the rev limiter. I cannot feel any fall off in power or and surging/miss. The car idles perfectly and runs fine. Here is where my question comes in.... What should I do about this? Should I try to find this problem or just not worry about it for now? Like I stated, the car runs and pulls great, but the dyno graph shows a problem. I feel like it is probably ignition related, but I don't want to go replacing parts without knowing the problem. I figure that I will know soon enough if the opti is going bad or any other part of the ignition for that matter, when the part just stops working. I am ready to put headers on and do a cam swap in the very near future. Should I go ahead with my plans or not? Also, I was considering getting a Scanmaster anyway, would it help in locating this problem? Thanks in advance.

Pull #1 274.4hp, 314.4 torque
http://www.villagephotos.com/viewpub...sp?id_=5489550
Pull #2 274.2hp, 313 torque
http://www.villagephotos.com/viewpub...sp?id_=5489585
Pull #3 274.4hp, 314.4 torque
http://www.villagephotos.com/viewpub...sp?id_=5489617
This last graph show the A/F ratio which showed a little lean, but I find that hard to believe considering my mods.
http://www.villagephotos.com/viewpub...sp?id_=5489659

I got some thoughts from others when I posted my dyno pulls on Friday, but I need some more opinions on this. Thanks.

EDIT: Here are my mods: Moroso CAI, Gutted Cat, Flowmaster Muffler. I also have removed the MAF screen and I have the Nitrous Works Plate system on my car(I seldom use it). Think the plate could cause any of this?

Josh-'04 GTO 10-12-2003 08:02 PM

Your links don't work. If the graph is very choppy, then you probably do have an ignition malady. This happened to me recently, and rather than mess around, I took the "war hammer" approach. I swapped out the opti, coil, plugs, and wires with brand new components. That seemed to do the trick, but if you're a little short on cash, then you'll have to try harder than I did to narrow it down. :)

whontime 10-12-2003 08:09 PM

The links should be working now, villagephotos is pretty crappy at times. I don't have a problem with spending the money to fix the problem, but..... The opti has less than 20,000 miles on it and I just changed the plugs and wires recently. Hopefully the links are working now..

whontime 10-12-2003 11:08 PM

TTT. I would really like some thoughts on this. The links to the graphs should be working now.

RedPhenx 10-13-2003 04:13 AM

if you dont think it's ignition could be springs or something floating? going out on a limb there, but it def does sound more elec, ignition related that mechanical, i would replace it or fix the problem, since if you dont it may mess something else up in the future


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