Porting tfs 205s
Thanks Jake. How bad was flycutting? If I bite the bullet and flycut, I'll get something along the size of the Hellion and raise my compression to 12:1 or whatever I can get away with on 93 octane.
Flycutting was fine. Just take your time. I'd do it again without hesitation. In fact I'm thinking of getting an 02 Camaro M6 and going with a different setup and would flycut there too.
And the chambers depend on the cam. A bigger cam needs more compression but has less ptv... So you're running into a convergence problem in terms of space needed and space available.
And the chambers depend on the cam. A bigger cam needs more compression but has less ptv... So you're running into a convergence problem in terms of space needed and space available.
I'm running a fairly large cam, 237/240 622/588 112+3 109iCL.
I want to run the tfs 205s because on the compression I can gain off of them. But I'd need them to be ported to help the motor breathe with the larger cam. Hence why I'm looking for someone who does good head porting with these heads. But if I can gain enough compression out of tfs 215s I may just run them instead.
I want to run the tfs 205s because on the compression I can gain off of them. But I'd need them to be ported to help the motor breathe with the larger cam. Hence why I'm looking for someone who does good head porting with these heads. But if I can gain enough compression out of tfs 215s I may just run them instead.
That's not really a good way to look at it... Pat G ran a 238/242 with AFR 205s and made 508rwhp...
300cfm is plenty for a 346. Getting it out of a smaller port equates to more power and will help throttle response and overall performance with a big cam.
One thing to add: flow is just one thing to consider. Efficiency of the port and how effectively you can fill the cylinder should be your primary concern.
300cfm is plenty for a 346. Getting it out of a smaller port equates to more power and will help throttle response and overall performance with a big cam.
One thing to add: flow is just one thing to consider. Efficiency of the port and how effectively you can fill the cylinder should be your primary concern.
Last edited by JakeFusion; Jan 28, 2014 at 07:04 PM.
True but wouldn't a bigger intake runner help push fuel into the motor?
And I don't look at peak hp numbers I look at the torque curve.
I'm not looking at just flow, I'm looking at the actual size. Yes the smaller runner will help with velocity but will it be enough?
And I don't look at peak hp numbers I look at the torque curve.
I'm not looking at just flow, I'm looking at the actual size. Yes the smaller runner will help with velocity but will it be enough?
My brothers car with these heads unported made 480rwhp 430rwtq. With a fast 102 and an eps 234/242 60x/61x 110lsa. But it's a screamer, it screams after 4500 but feels like it's waiting before that.
I'm running a fast 92 (may upgrade to the 102) and a ported tb with this cam and those heads.
I'm running a fast 92 (may upgrade to the 102) and a ported tb with this cam and those heads.
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Verdad Gallardo My brothers car with these heads unported made 480rwhp 430rwtq. With a fast 102 and an eps 234/242 60x/61x 110lsa. But it's a screamer, it screams after 4500 but feels like it's waiting before that.
I'm running a fast 92 (may upgrade to the 102) and a ported tb with this cam and those heads.
I'm running a fast 92 (may upgrade to the 102) and a ported tb with this cam and those heads.
I think I'm going to upgrade to a 102. But we'll see and hoping to have a better power curve with more average power. But a better power curve with more peak hp would be nice too.
I also have a ported ls2 tb, whereas he has a stock ls2 tb. Few little things here and there that he doesn't, but I'm doing every mod I can to make more efficient hp.
I also have a ported ls2 tb, whereas he has a stock ls2 tb. Few little things here and there that he doesn't, but I'm doing every mod I can to make more efficient hp.
Jake my brother launches off his 2step from about 5k. I think if he'd bump it to about 5500 and was a bit quicker off the clutch he'd get the wheels off the ground. I have a go pro vid of it and the front left tire is barely touching the ground right now.
Yeah, they don't do a very good job of marketing them. They say they are for the 5.3, but are really well suited for the 5.7. I'm sure they're on par or better than the AFR 205's.
I guess the question I have, having been down this road before, is why limit yourself with a 205cc runner?
The gains would be better with their 215's, and they're tried and true. I'm simply speaking if you're sticking with TFS.
I've had AFR 205's. And while they made great power, I never could get it out of my head just how much MORE I could have made with a bigger head.
Just asking a question here. No bashing whatsoever.
The gains would be better with their 215's, and they're tried and true. I'm simply speaking if you're sticking with TFS.
I've had AFR 205's. And while they made great power, I never could get it out of my head just how much MORE I could have made with a bigger head.
Just asking a question here. No bashing whatsoever.
Being that the 215s have larger valves, you can't get the compression out of them that you can with the 205s with out flycutting . But your right a bigger intake runner would help hp gains. But the 205s will help gain tq. Which is why I want to port a set of 205s. If I can get the compression of the 205s but get the runners of the 215s or close, gains will be more than one or the other could give me.
The 215s would give more peak hp. But then I'd lose on tq and the power curve would be higher in the rpms. Where as with the 205s I'll have a broader power curve.
The 215s would give more peak hp. But then I'd lose on tq and the power curve would be higher in the rpms. Where as with the 205s I'll have a broader power curve.
