Dynoed my 383
Dynoed my 383 I dont know what to do now. I spent and *** load of money on this new 383 set up and it only made 338hp@5800rpm and 366tq 
. I dont understand why it dynoed so low. It should have been over 400hp and 400tq. Brian Herter was the one tunning it at the time and he seems to think that its got something to do with either the heads or the valvetrain. He was most concerned with the fact that power started to fall off at 5800rmp instead of 6200 or 6300 where it should have been. What else could possibly be the reason why my dyno #'s are so low? 
. I dont understand why it dynoed so low. It should have been over 400hp and 400tq. Brian Herter was the one tunning it at the time and he seems to think that its got something to do with either the heads or the valvetrain. He was most concerned with the fact that power started to fall off at 5800rmp instead of 6200 or 6300 where it should have been. What else could possibly be the reason why my dyno #'s are so low? I have stock LT1 intake thats ported and ported heads with 2.00in and 1.56ex valves. the cam is 230/244 .510/.540 with a combo of 1.5rr on the exhaust and 1.6rr on the intake making the valve lift to be .544/.540. My hp curve is not as smooth as pictured above. I'll try to get a pic up of the dyno graph.
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Originally Posted by 96capricemgr
Golen shortblock with his heads and you selected a 306 cam?????
Oh and the Injectors are Racetronix 37lb injectors
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I would think you should be making more power. I would be more concerned with the power falling off at 5800...Which valve springs do you have and how did you set the lash? How is your ignition?
Bryan tuned my car a year ago and it made 385rwhp/366rwtq thru shorties and a stock wp on a dynojet in 105 deg heat. I have less cam and less injector. I know that the dyno has correction factors for weather, etc, but if you're sucking in 105 deg air its going to effect power...Numbers on dynos don't concern me too much, but I'd be concerned with the power falling off...It seems you would be getting plenty of fuel and Bryan could tell that...Like I said above, I would look at ignition, valve springs, and lash...
--Alan
Bryan tuned my car a year ago and it made 385rwhp/366rwtq thru shorties and a stock wp on a dynojet in 105 deg heat. I have less cam and less injector. I know that the dyno has correction factors for weather, etc, but if you're sucking in 105 deg air its going to effect power...Numbers on dynos don't concern me too much, but I'd be concerned with the power falling off...It seems you would be getting plenty of fuel and Bryan could tell that...Like I said above, I would look at ignition, valve springs, and lash...
--Alan
They're the CC918 spings. I had my buddy set valve lash, he did it with the motor off, he said he went to zero lash and a 1/4 turn for preload. That sounds about right to me. One of my friends told me that its possible that my compression my be lower than I thought. I was told by my local machine shop that I would be at about 10.8:1 CP. My buddy said that 10.8 is still kinda low for an NA 383. could this be my problem?
Originally Posted by BarneyMobile
I dont have a golen motor. The block is out of a 96 Vette.
Oh and the Injectors are Racetronix 37lb injectors
Oh and the Injectors are Racetronix 37lb injectors
I asked about Golen because they sell some strokers with very nearly stock heads that make weak numbers like this http://impalassforum.com/cgi-bin/ult...c;f=1;t=010986 people buy these base packages because they do not understand a 440hp on the engine dyno motor will be around 350 maybe even lower in a car.
What is the compression and what work was done to the heads??
Who chose/setup the springs?
HEADS are the key to a stroker if you did not have them worked there is your problem simple as that, ported heads on a stock shortblock is miles ahead of stock heads on a stroker.
I'd say its somehwere in the valve train. combining 1.5's and 1.6's.....never heard of that before. to me your nto letting all the exhaust get out through the valves.
I'd put all 1.6's on there and reset valve lash, and then re dyno. what feul pump do you have? what was your pressure at? even at 10:8:1...you should have more than 360hp.
I'd put all 1.6's on there and reset valve lash, and then re dyno. what feul pump do you have? what was your pressure at? even at 10:8:1...you should have more than 360hp.