So today we strapped the camaro to the dyno and we base lined it. I knew it felt slow and knew it would be down on power. Baseline was 150hp/200 ft lbs of torque haha. Good news was my air fuels were pretty darn good for tuning with no wideband, had a good 14.6 at cruising and idle and a 12.1-12.5 at WOT. Anyway, The car has a high rpm miss. We took the plugs out and re gapped them to .030 and retested, jumped to 168 hp, 215 torque. So i am pretty confident it is igntion related. cap and rotor are probably a month old, wires about a year, coil about a year (msd blaster) and plugs about 4 months. Plugs looked pretty good when pulled as well. What do you guys think i should change or look at first? I figured wires would be first on my list but i wanted everyones suggestions. I forgot to mention the dizzy is new with a new a/c delco module as well. Car finally dynoed 180/241 after messing with knock retard and such. I know she has alot more in her. When i made that pull it was much much smoother until about 4500rpm when the miss showed itself again.

nice job on the a/f tuning! it's kinda funny to see how much of a difference plugs and electrode gapping can make if fueling is fine, i'd also guess it to be ignition-related.
so, did you already change the plugs out? you maybe want to go to a colder range and/or other plugs such as the RapidFires (summit's ACF-1 is what i'll be using)

do you have a hp/tq/rpm/afr sheet of your pull?

edit: sorry just re-read your post saying you changed plugs 4 months ago.. anyway, what did they look like?

they looked pretty good, dark tan showing it was kinda fat but im wondering if its just a weak spark causing em to show a tad rich.

I will probably change the plugs anyway because they are cheap. I am leaning towards the wires being the culprit since i never seem to have a set of aftermarket wires last more then 2 years but..

I would check that coil also . The reason I say this is I have a buddy that has never had good luck out of there coils wether it was on stock ignition or running MSD box so he went to a Accel coil and has run it for 6-8 years now with no problems .

I guess it wouldnt hurt just to give it a full tune up...isnt very expensive i am just being a cheap *** haha.. I will see if i can get it back on the dyno today and post my results with graphs too

That would be cool .

ok ignition miss is fixed, i changed the coil, wires and plugs and im pretty confident it was actually the plugs. I was using ac delcos however they were the wrong plug for the engine, they didnt seat right so i now have a set of ngks ur5's that are right for my 601 head. Car feels MUCH better. I am going to redyno it sometime this upcoming week.

great, that sounds promising! keep us posted

Sounded promising but didn't do squat.

I fixed the miss, and fixed my air fuels (they were alittle fat towards the end it would dip as low as 11.6:1) i leaned it out to 12.5...even 13:1, it didnt change power at all.

182hp/241tq

Spark timing is in @ 34 degrees (though i cant prove this at the moment, no datalog or timing light to verify, but its what i am commanding)

I did forget i am not locking my converter, it unlocks at wide open, so i am hoping that is my extra 20wheel. If it puts down 200 i would be happy. That means i came relatively close to my goal of building a 260hp 305.

by the way my combo is:

L03,
601 heads,
lt1 cam,
heddman shorties,
heddman y pipe,
not cat,
hooker aerochamber exhaust,
weiand stealth manifold,
stock tb with ultimate tbi mods and 65lb injectors,
supporting ignition mods
stock trans with vette servo
2.73's

Don't Dyno in Overdrive use drive because it uses a 1/1 gear ratio and when you are in Overdrive at wide open throttle it shifts down to Drive anyways and your convertor unlocks .

I am dynoing in 3rd...you can feel like lock or see it actually but as soon as i got wide out it unlocks.

I found you can manually lock it by jumping the diagnostic port terminals a and f. I may try throwing it back on today, we will see but i knows its a guaranteed 10 hp at least.

Yeah I would try that .

What did you come up with ?

Haven't been able to get to it. I had to made some new tunes for the Ford 6.0L diesels and then we had a 2010 stang on the dyno to play with. Not really sure when i will be able to get it back on there...

Keep us posted .

My 601 heads like 36-37*BTDC by about 3,200 rpm. Depending on the fuel being used, 12.5:1 could be too lean. I try to shoot from 11.75:1 now, since you never know when you are going to hit a tank of E10 that is doused with Ethanol.

1.5:1 roller tip rockers really aren't helping you. A 1.5:1 or 1.6:1 FULL roller rocker would be a MUCH better rocker. Full rollers can give you 10-15 ft/lbs across the WHOLE rpm band by reducing friction at the fulcrum, with 1.6:1s giving additional gains from the increased lift and duration.

Although I have not personally used them, I have not heard of a fast thirdgen running the Hedman headers and Y-pipe. While its better than stock, its still restricting your setup.

ah fast i was hoping you'd eventually chime in here. Alright i will up my timing and try and shoot for a richer air fuel and yea next on my list was changing the exhaust, what would you suggest fast?