418ci LS3 dyno low??
Also need...
throttle cable bracket $30
Valve spring kit $300 (assuming springs not included in your 1200 dollar porting figure?)
MAP extension harness $25
Fuel Rail $100
I'm not disagreeing with you...I'm in the middle of a cathedral to LS3 topend swap right now and just making the list more complete
I assume 1500 for TEA included springs?
throttle cable bracket $30
Valve spring kit $300 (assuming springs not included in your 1200 dollar porting figure?)
MAP extension harness $25
Fuel Rail $100
I'm not disagreeing with you...I'm in the middle of a cathedral to LS3 topend swap right now and just making the list more complete
I assume 1500 for TEA included springs?
Also need...
throttle cable bracket $30
Valve spring kit $300 (assuming springs not included in your 1200 dollar porting figure?)
MAP extension harness $25
Fuel Rail $100
I'm not disagreeing with you...I'm in the middle of a cathedral to LS3 topend swap right now and just making the list more complete
I assume 1500 for TEA included springs?
throttle cable bracket $30
Valve spring kit $300 (assuming springs not included in your 1200 dollar porting figure?)
MAP extension harness $25
Fuel Rail $100
I'm not disagreeing with you...I'm in the middle of a cathedral to LS3 topend swap right now and just making the list more complete
I assume 1500 for TEA included springs?
And if he buys an LS3 fuel rail for $100, he can sell his fuel rail for close to that.
Either way it would still be cheaper or close. I'm not bashing ported 243s as I have the same stuff and more than happy with it, but sometimes I think a set of rectangular style heads would've cost me less and probably made more power (at the expense of low end torque on my setup, something that should not be an issues on a 4.080 bore block like his).
While I'd say those numbers are low for that cam and a 418 stroker I'd be WAAAAAYYYY happy with that tq curve. The fact that it peaks so early and the pull wasn't even to 6k makes me think those heads are choking it bad....I'm sure the exhaust doesn't help but that cam should develop peak hp a good 800+RPM later.
A vacuum pump might help as well. But it's easy to spend someone else's money. :-p
A vacuum pump might help as well. But it's easy to spend someone else's money. :-p
Last edited by Exidous; Apr 18, 2015 at 05:33 PM.
While I'd say those numbers are low for that cam and a 418 stroker I'd be WAAAAAYYYY happy with that tq curve. The fact that it peaks so early and the pull wasn't even to 6k makes me think those heads are choking it bad....I'm sure the exhaust doesn't help but that cam should develop peak hp a good 800+RPM later.
A vacuum pump might help as well. But it's easy to spend someone else's money. :-p
A vacuum pump might help as well. But it's easy to spend someone else's money. :-p
In all reality, that was a hair bit more than what I was expecting in tq. I was initially more worried about that number over the hp. I definitely hear what your saying about the heads. I wasn't exactly expecting this. With that said, I have a problem else where that is contributing to this, even if its small. I seriously believe my cats are toast. I had a small handful of stumbles lastnite with the wife in the car around 2200 and 2400rpms. Infact, I had the same thing happen on the OLD motor cruising on he freeway one day as well. Its either the cats, or a potential coilpack. I have the delete pipes coming this week and will hit the dyno again to see. No it's not you're right, but stock cubed LS3s with stock heads and intake are pushing 500rwhp.
Yes you have some other areas to open up and free more power, but you're really being limited by the heads. Those are good for torque down low, as you obviously have seen, but you can't expect ridiculous amounts of power up top...it's just the nature of the beast.
Yes you have some other areas to open up and free more power, but you're really being limited by the heads. Those are good for torque down low, as you obviously have seen, but you can't expect ridiculous amounts of power up top...it's just the nature of the beast.
prime example right here.
https://ls1tech.com/forums/dynamomet...ast-102-a.html
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From: Wilson n.c.
there are plenty of ported 243 head strokers pushing well over 500whp. I do not see a stock LS3 head outperforming a worked 243 especially under the curve.
prime example right here.
https://ls1tech.com/forums/dynamomet...ast-102-a.html
prime example right here.
https://ls1tech.com/forums/dynamomet...ast-102-a.html
thats whats i was saying
there are plenty of ported 243 head strokers pushing well over 500whp. I do not see a stock LS3 head outperforming a worked 243 especially under the curve.
prime example right here.
https://ls1tech.com/forums/dynamomet...ast-102-a.html
prime example right here.
https://ls1tech.com/forums/dynamomet...ast-102-a.html
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There is definitely something going on in your setup. If you put your cam in that other motor that made 550/500, your cam would make at least 530/480... Your cam is easily big enough to make 520+ at the tires... I have a 10% intake restriction reading from the map sensor and i still put down 520/490 with a very similar setup to yours and a much more parasitic drive-line. There is more power in your setup just waiting to be unleashed. Good luck finding it OP.
There is definitely something going on in your setup. If you put your cam in that other motor that made 550/500, your cam would make at least 530/480... Your cam is easily big enough to make 520+ at the tires... I have a 10% intake restriction reading from the map sensor and i still put down 520/490 with a very similar setup to yours and a much more parasitic drive-line. There is more power in your setup just waiting to be unleashed. Good luck finding it OP.
. Well there are key things like mentioned....1 3/4's vs 1 7/8's, Unported FAST (will be doing sometime this summer), and (im certain) cats. Im headed back to the dyno once I get the cats off. Other than what ive listed, I really don't know. 
changing headers will probably net very little gain but who knows. the lg 1 3/4 headers make good power. my car (f body but still....) had 1 3/4 qtp, unported 90,just got rid of the bump in it,244/248 cam made 538 rw on my 408.after you get you cat delete kit on and hit the rollers again if they would let you you could drop the exhaust and see if that 2 1/2 system is restricting it any.
There are some areas that you already know of to improve upon, so I wouldn't worry about the numbers until you address those. That torque curve is sick though!
Dyno numbers are not just numbers, they are a clear representation of where the car is. How many times do guys say that and come to find out weeks later the tune was off or something else. Yes some read a bit low and some a bit more but if you aren't even in the realm of where your build should be it's a clear indication of a problem.
Cat delete and ported fast is probably worth 30whp...probably another 10-15 going to a 1 7/8. There is a bit left in that combination if you wish to pursue it. However if you are happy and it runs good, then that is all that matters...dyno numbers are just that...numbers.
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There are some areas that you already know of to improve upon, so I wouldn't worry about the numbers until you address those. That torque curve is sick though!
Dyno numbers are not just numbers, they are a clear representation of where the car is. How many times do guys say that and come to find out weeks later the tune was off or something else. Yes some read a bit low and some a bit more but if you aren't even in the realm of where your build should be it's a clear indication of a problem.
Dyno numbers are not just numbers, they are a clear representation of where the car is. How many times do guys say that and come to find out weeks later the tune was off or something else. Yes some read a bit low and some a bit more but if you aren't even in the realm of where your build should be it's a clear indication of a problem.
I agree it's a tuning tool and lets you know where you are at. I would love to see the graphs of when you did this comparison.
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