Okay guys I posted on here before about problems but I am still stumped.
Kinda had a few beers so bear with me.. and no intake/vacumn leaks. pulling 10-11 hg's of vacumn.
About a month ago I had my new cc306 cam , ported heads by a professional shop, crane gold 1.6 rr's. stock lifters, installed had comp r lifters. but 4 failed so put in stockers again. adj. to 1/4 turn past zero lash. .600 lift k-motion dual coil springs,hardened pr's.new accel 300+ ign. holley 58mm. t.b. ported intake 30lb. accel injectors. new lunati timing chain/gear. all new gaskets. and had it installed. installer said he did degree the 306 cam. I did fudge up and put in a used opti off of ebay, was very clean suppose to have only 40,000 miles on it. non vented for my car. new plugs,wires, do have used heated 02's in it. have new ones in on fri. oh yeah madz28 tune. anyways, did not gain hardly any h.p. if any. only gained .1 tenth and 3 mph. in 1/4 mi. car seems to run good. lost quite abit of lower end tq. car does have some cam surge, and am showing 160blm's. at idle closed loop. does not seem to be missing. just loosing alot of power. any ideas on what it could be, does not miss all the way to 6,000 rpm's. maybe I did pick too big of cam, because of stock bottom end. shifting at 6,000-6,2000 rpm's. could it be the 02's. they really jump around on the datalogger, no codes, they go from 65-950's at closed loop. runs smooth when going wot all the way to 6,000 rpm's. I know the cam is seeing overlap, and causing a false lean, getting dynotuned in mid. august now to help straighten it out. could my tune being off cause what I would say is a 50-75hp. loss? or opti, but like I said not missing out all the way to wot. or could 02's be causing the power loss. or could the cam be degree'd wrong. does not backfire or pop... just loosing alot of low end, and I feel that I am also loosing top end.. all around... please any ideas or questions just ask... and sorry so long,, kinda drunk, because I am so depressed, spent over 5,000 total in mods and not much too gain? I also have gears/stall. panhard/lca's. alot of mods... Please Help...

 

The Accel injectors are crap and I would not have put a cam that big in a speed density car unless you were having an in person tune or a very intensive datalogging and back and forth with info with the tuner. B&M is possibly the worst shift kit offered for these trannies as well, the adjustable FPR could be making Ion's tuning job very hard.
Frankly you needed to come here and do research before putting together such a poor combo. I am running a smaller cam in a heavier car and trapping 106 in the summer heat.
Transgo is the only shift kit you will find recommended by reputable 4l60/4l60E builders, adjustable regulators can be of use but most folks will just screw things up with them, the need to be treated as part of the fuel system not as a tuning tool. Bigger is not always better in cams, especially with a engine management system like yours, the MAF systems are MUCH more forgiving.
A used opti with the rpms that cam needs is a gamble, I would strongly recommend a new cap and rotor.
2800 stall is a bit low too and can I guess it is something cheap?? The good 9.5" units are great Edge is my pick but will say Yank and Vig are good too.

 

Yeah Dwayne I should of done more research... lesson learned.. if I don't get it straightened out I am going with a LE 2 cam new lifters and a new opti this winter. I finally got a new dynotuner out of st. louis he scanned my chip and noticed that it is set really lean at lower rpm's. really rich in the upper rpm's. and is tuned for a 348ci. with 29lb. injectors. hopefully he can help. he is making it to get me by until he comes back up in mid. august and is going to dynotune my car. I just hope that I can atleast pull 370 at the wheels... yeah I also learned about the junk accels injectors after the fact. next time I am doing major research. but I also hear stories where stock LT1's are pulling 365whp. with the 306 on stock heads... but prob. just fabrications.... oh well lesson learned...
is it poss. that my tune can be that far off... and I can get decent h.p. with the mods I have?
Oh yeah the stall is a tci 11" breakaway stall..

 

365 with a stock LT1 and a cc306? Hard to believe.

 

Did you adjust the rockers with the car running?

 

The 306 is not bad it is just bigger than most should go with especially with the speed density. I know of a local car with it in a 383 that is just nasty, it can make good power but in a 350 most of us are not going to like the drivability or the complimentary parts needed to make it truely work. Milling and a thin gasket can help the lowend with compression, but tuning will still be the key and a PITA with speed density.

Far as the 348/29lbs I have seen LT1 Edit/Tunercat interperet tunes written on one another pretty goofy wonder if that is what happened here, not that either was using LT1 Edit but maybe just different programs.

Far as making mistakes we all have just admit and learn from them.

 

I did adj. the rr's with the car running. went about 1/4 turn past zero lash.
Well I guess I will see how the dynotuner does... if all hope is lost I am prob. going to find a shortblock and save some money and put a 383 kit in it... oh decisions decisions... just stumped why only around a 25hp. gain. I should of gained more than that with just the heads and rr's.

 

Send me a PM of the tuner you're using out of St. Louis. I pretty much know all of the good tuners around there and can give you some insight or recommend someone else. Also, let me know where you're located. Even with speed density, you should be able to gain more than a .10 in the quarter. A custom tune will probably do wonders. Post back after the car is tuned and see how it runs. I know a tuner around the St. Louis area that takes cars with MAF and switches them to speed density because he can get more power and better driveability out of the car. He's damn good too.

 

you cant shift that cam at only 6000 - 6200 rpms. you need to shift much higher. it was probably not a smart idea to put such a big cam in a speed density auto where you cant change the shift points through a computer. your going to need to get a spring set and re-do the shift points manually in the tranny..which is alot of trial and error.

you should put it on a dyno..and run it to where that cam needs to be run to see if your making the power,and get air/fuel. without doing that, its just alot of guess work by fixing this and that.

you are also running a 2800 stall? with a 306 cam, you would need a 3600+ stall.
No offense, but it doesnt sound like you really researched your descisions.

First things to do, is shift much higher (i think 306 cam users shift at like 6600-6800 rpms, but dont quote me on that). and get a much bigger stall. Also, dyno it. you are probably making the power, but your gearing and stall are WAY off.

 

GET a GEAR and a tune and shift about 68/6900. Your stock bottom end won't last long but it should run while it's running.

 

I can vouch for this by experience.

 

I had not even thought of how a 4L60(no "E") would shortshift if not opened up and tweaked, very good point.

 

yeah my tranny really shortshifts... I have to manually shift it to get it to rap to 6200 at the track, I also unplugged my heated 02's today to see how it runs also, to see if the 02's are going bad. haven't drove it yet, but I am going to try it tomorrow.

 

I've ran 12.0 with "junk" Accel injectors.

I'm running a CC305 with a Speed Density car that has a mail order PCMFORLESS tune. Speed Density cars usually respond better to modifications. Why do you think ALL aftermarket fuel injection systems are SD? Why do you think so many people do away with the MAF system to install SD?

I'm THE MOST REPUTABLE 700/4L60E BUILDER on this board, and I won't install a Trans-Go shift kit in anything, unless I want alot of burnt up parts.

Why are you giving this guy information based on your off the wall theories? Let's keep the replies based on facts, so we can help people.

Frank

 

B&M sells a governor spring/weight kit that allows you to tailor your shift points wherever you need them. If you need any help with this, give me a call.

Frank