EDIT: the airfuel #'s that i posted were wrong...

went to the dyno last weekend. not sure the torque numbers yet (i gotta find out still) but it made 318hp (motor) and 441 (nitrous). more importantly, my air/fuel is was 12:1-13.2:1 on motor and 11.5-12.1:1 on nitrous. going to Bradenton (1/4 mile track) next weekend for some long awaited track numbers since i finally got a working transmission.

 

uh... larger valves + cam and you only made 318.... those are hotcam numbers...

 

I thought a nitrous tune should be more like 11.5 to 11.8?

 

Don't expect the motor to last very long on spray with a 12.9:1 a/f.

 

its an auto too btw. its only a cc305 and the heads arent really ported. c'mon dont make me feel too bad im happy being 60-something rwhp higher than stock. so i guess it should be a little richer while spraying huh? i've been spraying this car for 3 years. last time on the dyno was 13.1 spraying...i guess i'm still learning. oh well i've been lucky so far with this car. i know its just a matter of time though

 

I'm not sure what to say. Seems like your numbers w/o the juice
should be 20-35 rwhp higher.

 

I am sure their is a bolton car out their that put down close to those numbers.

 

Your numbers are not far off for a 503 without well ported heads, and through a fuddle stall. I would expect 320-330. A stalled auto will never dyno like a smilar M6, no point in listening to people try to compare them. The "missing" 10rwhp or so isnt much to worry about, especially considering day to day variances on dynos.

The track numbers will show the true story, but I do not think you have much to worry about.

 

thank you. track #'s are more important to me anyway, i just figured i'd post them. it was the cc305 btw (.510/.510 220/230 114lsa) (+1.6 rr's). im sure the numbers would have been higher if it was a manual transmission, but doesnt bother me. at least i know i can get below an 8 second 8th mile time (on motor) with 318hp and my goal next week spraying is 11.4 @ 121 or so (this is a goal, this is not my best time).

Also, i was wrong about the air/fuel. it wasnt as lean as i thought. here's the dyno graphs...

here's the dynographs...

 

Don't worry Ryan, we'll see what it does at the track and then go from there.

 

Dyno numbers don't mean **** on an auto car. Back when I was cam only with a 218/224 I only made 303 at the tires, but ran 12.4's@108-109. Don't get hung up on the numbers. Just make sure your setup works well together

 

 

i hate it when they post MPH speed instead of rpms. but those dont seem bad for an auto car with stall. i had a buddy only make 374whp with a 406 sbc with like a 4500stall unlocked. Car runs high 10's at 126....and it aint gutted

 

I think those numbers look about right! My car with 218/224/112lsa cam only made 297 my first time to the dyno through a 2800 vigilante. After some of my own tuning I got it up to 310hp and about 345tq on the dynojet. It liked having more fuel. According to the dyno's wideband in the tail pipe I had worked the AFR down to 12.4:1 and it was still picking up a couple horse power at a time. I ran out of time and didn't get to try any richer AFR's. Keep us updated on the track times!

Just out of curiousity, are your valves back cut? And did you have a 3-angle valve job or 5? I have not learned much about head flow but I would think bigger valves will change the flow characteristics of the heads. It may have raised peak flow numbers with stock porting but at a higher lift than what your cam makes. Or maybe it didn't help at all without porting the heads. Its impossible to know without actually having the heads put on a flow bench.

PS...The difference between a manual and automatic transmission on a motor making 375 HP at the flywheel will be anywhere between 20-40rwhp depending on torque converter! From what I've seen at the dyno, on our 4L60E's that difference is about 25-30rwhp difference to our T56's. I say this based on results of similarily set up customer's cars I've tuned on the dyno. Obviously each motor, even with the exact same modifications, will not put down the exact same numbers but this seems to be the general trend in my experience.

 

im not sure if the valves were back cut (if they would charge more for that, i dont think they are because i dont remember paying more for it). it was a 3 angle valve job and the heads aren't really ported. i just got the edges gasket matched. i changed my mind about going to the track this weekend. there's a track event on saturday the 29th in bradenton, so i'm gonna go to that instead. i'll post back the results.