Engine spec:
chevy 383
Edelbrock RPM heads
Compcam 276hr-14
1,6 roller rockers
HSR ,30 lb injectors
Hooker 2055 3" catback
comp 10,8:1

Only got 295 rwhp and 510nm was expecting 320-330rwhp, AFR was 12,8 when I tested the day before but 11.6 on the dyno how much HP did that cost me approx?
Pictures here http://cid-7a06729d03062ecf.skydrive...aspx/Bromsning

 

Well first look at it this way...Thats power making it to the wheels...second look at your rpm range, you hit 6grand correct...and then look at your trq...almost 360 ft/lbs !!! You may not have the #s you want but Id say its pretty stoout and the car should be pretty quick.

 

seems low for a hsr on a stroker...is it dialed in all the way with the tune?

 

The cam doesn't seem too radical, I wouldn't assume these numbers are that bad at all. Has someone gotten significantly more out of a similar build?

 

The problem is those heads, get something bigger than puny edel rpm heads.

 

Should be capable of more hp than that. I've seen 350 L98s with that cam but miniram and AFR heads put out near 370whp. HSR is capable of similar hp as miniram for most situations. Well built 383 should have no problem reaching near 350whp with that setup, but i'm not too familar with the heads

How much timing are you running? Was the cam degreed when installed?

 

Good points.
Have you done a compression test?
350 w/ 276hr and Vortecs made 282rwhp and 280ftlbs torque.

 

No I have not done a compression test yet the engine is newly built. Timings at 34 deg from 3000 and up. the cam was not degreed when it was installed. Because I read this on compcams site that it wasnt necesary I installed after their instructions:
"Should you degree your new cam?
It isn’t absolutely necessary to degree the cam for the engine to run efficiently. COMP Cams® grinds most
of its High Energy, Magnum, and Xtreme Energy™ cams four degrees advanced. This positions the camshaft for the best street performance."

How much hp could I expect to gain if afr is 12.8 instead of 11.5? I had hope for 330-340rwhp but I guess it wont happen with my edelbrock heads.

 

I gained nearly 50rwhp when I brought my AFR's at WOT from high 11's to high 12's.

 

God d.a.m.n. 50 rwhp??? Maby thats where my missing horses are, I only need 35rwhp to reach my goal for this year.

 

Why do alot of people worry about dyno's??? You could have 400rwhp on a dyno but if you are only running 13 sec ETs....its kinda pointless....

My suggestion is look everything over...and if it still dyno's around the same so be it. I ran mid 12's solid with only 310rwhp and 330rwtq.

 

That is what did it, you need to lean out your afr. 11.6:1 is way too rich at WOT, you need to get it back in the 12.6:1 / 13.4:1 area. What does your timing look like, 34 degrees throughout....?

 

yes 34 degrees. Any1 had RPM heads and then switch to AFR 195cc? How much can I gain from that? Is the difference worth it?

 

Lean out the air fuel ratio, then slightly increase timing to see what the engine really wants. Start out with 34 degrees, of course, then back off when necessary. How many pulls are they allowing you....?

 

Not worth it. You should easily be making what you want with what you already have....

 

There is only 1 pull for $110 I dont know how much he charge for a couple of pulls. It feels like the heads are to small for 383 they are only 170cc/65cc and flows
229 at .400 and 232 at .500

 

IF your A/F is 12.8 on the street, then leave it! Dyno will not load the motor as much as street driving so leaning it on the dyno to show hp will make the car run much slower and more dangerous on the street due to being lean

 

14.7 w/out ethanol is stoich, but with the 10% of ethanol in the fuel today he's now looking at about 14.1 being stoich. He can lean out the air fuel ratio closer to 13.4:1 w/out going lean in a naturally aspirated engine, and this of course works best in conjunction with the right amount of timing thrown into the mix. His 220/230 510"/510" @ 114 is pretty tame for a 383.

 

At 11.6:1 your running way too rich at WOT in a naturally aspirated engine, and your robbing yourself of horsepower. Leaning out the engine some more will get you where you want to be, but just remember that there is always a limit to how much fuel you can pull out. We tune fuel with the air being consumed, not the air with fuel being consumed....

 

See what it runs at the track. Dynos are more of a tool then a bible. I had that cam in my 350 last year and went 12.27 with the stock tpi intake and 11.95 with a miniram, 3400 pounds. Never been on a dyno though. That cam is pretty good for a street car and very easy to tune. And I agree with Orr about the dyno not being able to load the motor causing it to run rich. See what the afr is going down the track. If tuned right it should run pretty good though the 170cc runners are a bit of a comprimise.

 

You ran a 12.2 with a stock TPI in a full weight thirdgen? More details please...I'm finding that extremely hard to believe.

 

Take from his signature:
Looks like its a bit MORE than stock.

 

By stock tpi i did not mean stock motor. He said he ran a 12.2 with a stock tpi INTAKE. I dont car what heads cam package you come up with, your not going to hit a 12.2 with a stock tpi intake on a 350, without using nitrous, in a full weight thirdgen.

 

i got rpm performer heads 2.02 1.6 64cc 3-8 stud, 1.6 comp silvers, 12-367-4 comp cam rpm air gap intake, high flow oil pump moroso 6 quart pan etc and i should be look at around 450-500 hp

 

You have a bigger cam than I have but 500hp with heads that flow 229 at .500 and 231 at .600 I find that hard to belive. They usually put out 400-420hp.

 

it was just a rough estimate. maybe it is somewhere around 400-420 but it really dont matter to muchhp you have. hp dont mean anything. its the torque you have at that certain rpm.