95 Z28 M6 - CC306 w/ported factory heads

338/326


Note: I bought the car as it sits and have only tweaked the tune, so I don't know the exact flow specs on the heads. Stock bottom end, 119k. AFR is 12.9-13.2 at WOT. Thoughts? This seems awfully low compared to what I've seen from this setup. I have Edelbrock shorties, a high flow cat and an unknown catback (Magnaflow I think?). Peak torque came on at ~3k and stayed there, power climbed until redline. One theory is that I might be choking it with the shorties. Opti is newer, plugs are new, wires are good. Car runs great in general.

not too bad for stock ported heads and that cam

i dont think the shorties are the issue, i've made more power then that with the same headers.
what type of dyno was it? have you ran it at the track to see what it traps?
both numbers seem at least 30 low, not sure how much cats are going to choke it up. i had decent heads and same cam and dynoed 390/360

I think u can go leaner at wot...

leaner is meaner.... ;) j/k

MEMBER @ LTXtech.com

Might actually try richen it up to 12.2 or 12.5 what timing?

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Originally Posted by Dangerous95lt1

Might actually try richen it up to 12.2 or 12.5 what timing?

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on a serious note...wasnt it like 11.5 that was the prime na wot a/f?

MEMBER @ LTXtech.com

That's way low. More often than not a CC306 cam only car will make around 360 RWHP. N/A you want to go about 12.8-13.0 AFR at WOT, for the "sweet spot" per se.

I was shooting for 13.0, ended up a bit over around 4-5k. It's not exactly dialed in, but I didn't expect it to be THAT low on the dyno. Timing is aggressive, but zero knock. I don't have the tune in front of me so I don't have the numbers. I suppose it's possible the guy I bought it from was full of shit and these are just factory heads. Would it even make this much power with this huge cam and untouched stock heads?

Leaving a lot on the table. My wifes TA with simple bolt on's and stock internals put 339 to the tire. All she has is 1.6 rockers, shorty headers and a cut out and a gear. Nothing else. All I did was tune it. You should be in the 360 neighborhood with a good tune. I was actually shocked to see your hp number and being 1 off of her car and hers is an auto. Here is the dyno from when I tuned it for the previous owner of the car right before we bought it.
http://i3.photobucket.com/albums/y77/jpack24/KIM.jpg

My car cc306 car. Picks up a full tenth at track between 13.0 afr and 12.4. N/A runs 8.03 with 13.0 and 7.93 with a lil richer 12.4 afr. 1/8th mile times. AEM wideband

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