Did you ever think it might be a combination of things? Do you really think the 612s are the hot set-up?

 

It very well could be a combination of things. Doesn't look like valve float, though.

 

looking at my datamaster logs though, the car seems to flow decent amount of air... from 5900-6350 it flows around 330 Gps at the MAF, which would indicate that it's getting the air even higher in the powerband. Also there is minimal knock retard.

 

Any knock retard is bad.

 

i was guessing knock retard on page two.get a cable, and when it gets in download tunnercats,buy the deff file for your car and shoot me a pm.you can get a cable and deff file for $50 or so, then we can take alook at what is causing the kr.pcm for less base tune will alow for 10 deg or retard im pretty sure.all you have to do if find out at what tps % and rpm your getting the kr and turn the timing back a couple of deg in those cells.not hard to do.post a datamaster file in the computer tunning forum, but like i said youll need the cable and deff file to fix it.

 

Are you mental? I don't recall ever saying it was any ONE symptom, but rather it WAS NOT valve float. You're a weird dude. Please keep your bleeding emotions in the designated thread. No need to **** this one all up. Perhaps instead of wasting your time with the rolleyes why not explain why you think one of your "combination of things..." is the springs? G'head....

 

How's the ignition system? all up to par?


With dips like those in the middle I'd say it's something to do with tuning, a good dynotune should fix that.

And your lack of peak power suggests to me that you got ripped on those heads, there is alot more to porting heads than flow numbers.

 

Oh? Are you sure about that? Please explain.

 

Sparkplugs are some new AC Delco's that were put in with the new cam kit 3 years ago. MSD 8.5 wires changed last summer, stock coil, opti replaced in summer of 1999 (has about 40,000 miles on it).


11secgen, I'll try to get some datamaster files posted up ASAP. I just need to find a place to host them.

 

Here's a log from 2005:
http://www.sharebigfile.com/file/198069/2005-uni.html

and from 2006:
http://www.sharebigfile.com/file/198070/2006-uni.html

To download the files you have to scroll down to the bottom of the page and enter the code and click submit, then wait like 20 seconds to be able to download the files.

I don't have any logs from the dyno day unfortunately, but this is the same setup I've been running the whole time. on thing to note is, 2005 and 2006 I had different pcmforless tunes. with the tune from 2006 I made the most power on the dyno. Tune from 2005 made 334 RWHP (you can see the curve under the 340 RWHP curve).

 

I had this same cam and blew up my opti on the dyno... but before that happened it made 318rwhp and 335rwtq at 4900rpms (max rpm we went to) So I would say your tq is a little low. I did not have the elec. wp. at the time either, but I would definitely get rid of the springs. I ran those springs with that cam and one of the springs decided to explode into 3 peices one day while starting the car. Loudest pop I ever heard. I am not saying your dyno problem IS valvesprings but I am saying that I dont see how at least some beehives wouldnt HELP your dyno. HTH

 

I'd have to be, wouldn't I, to keep up with you. Ever hear of harmonics? Ever hear of guys having problems with the 612s? Do I claim to know what possibly could be wrong here, no. My statement simply stated it could be multiple things. And I was wondering if you thought the 612s were enough spring to do the job. Are they?

 

For that cam they would seem to be. I don't believe I've ever seen such an early onset of valve float which came on so suddenly and recovered so quickly. Harmonics? It's a possibility, but since the original poster said the A/F ratio also fluctuates along with the torque curve I believe that should be investigated first. It makes a bit more sense than just plainly telling someone to replace their springs before investigating why.

 

You know it's funny you should mention that because on the way home from the dyno day, I was driving along on the highway, at one point I just held it a 3500 RPM for a few seconds... then all of a sudden 'POW' I heard what sounded like a gunshot I think it came from the passenger side under the hood I don't know what to make of it??? I was thinking it was just a backfire, but I really could have sworn it was coming from under the hood??

Anyway, so today I pulled the valvecovers just to see... everything seems fine from what I can see though (I'm just paranoid I guess)




Only thing was this guy seems to be not quite centered over the valvespring but I have NSA rockers with guideplates so I guess it's normal...


passenger side:










Also I've noticed that since this hapenned on saturday... my car seems to be burning oil ...in the exhaust... it is usually just the 'rich' exhaust smell but now I can distinctly smell oil burning. Thing is though is that there is no smoke, no smoke on startup and no smoke while I drive (I just went out for a spirited 10 min. drive and there was no smoke I was keeping my eyes on the rear view mirrors the whole time I think this car is making me crazy??

 

Picture #3.....the rocker is WAAAY out of wack!