Quality LICP?
Originally Posted by spdracerut
That is incorrect. Using the coupling as transition is pretty abrupt and creates a flow loss. When you have a tapered pipe going from small to big, it's called a diffuser; you can also call it a diverging nozzle (as opposed to a converging nozzle which goes from big to small). The smaller the angle of the diffuser, the lower the loss. You try to not go bigger than ~7 degrees on the taper (or 14 degrees included angle).
Well, short version, when you go immediately from a small hole to a bigger hole (no taper, basically 90 degree angles), you get the biggest losses. A diverging nozzle minimizes losses.
In the case of LICPs, using a diffuser section probably adds a bit of cost and complexity (because you also need the smaller diameter piping as opposed to one size piping). Using the coupler for the transition makes things a lot simpler. While not ideal, it's probably not much of a loss compared to if you used a proper diffuser on something like this.
If someone gets bored... could always test a few variations out on a flow bench!
Well, short version, when you go immediately from a small hole to a bigger hole (no taper, basically 90 degree angles), you get the biggest losses. A diverging nozzle minimizes losses.
In the case of LICPs, using a diffuser section probably adds a bit of cost and complexity (because you also need the smaller diameter piping as opposed to one size piping). Using the coupler for the transition makes things a lot simpler. While not ideal, it's probably not much of a loss compared to if you used a proper diffuser on something like this.
If someone gets bored... could always test a few variations out on a flow bench!
So I guess the word "taper" in this case is incorrect, we should be saying "diffuser" instead.
Cost aside, that means that the AMS way of doing it, which "diffuses" smoother rather than abruptly at the connector, is the correct way of doing things.
Well I am very glad to know about this big difference in performance from that taper in the lower pipe!
Just think, my car ran 10.88 at 128 with the 20gLT on it and our lower pipe and then I upgraded the turbo to the GT35R and ran 9.97 at 142.32, if only I had known about that difference I could have gone fast! haha
Just think, my car ran 10.88 at 128 with the 20gLT on it and our lower pipe and then I upgraded the turbo to the GT35R and ran 9.97 at 142.32, if only I had known about that difference I could have gone fast! haha
Originally Posted by davidbuschur
Well I am very glad to know about this big difference in performance from that taper in the lower pipe!
It's all speculation at this point unless someone flow tests them!
David: so your new IX LICP also does not taper/diffuse slowly like the AMS, right?
I had actually suspected (without any proof though) that the slow taper of the AMS one was too long, as in it tapered/diffused too slowly, and should maybe be done at most in about 8 inches from the small diameter side, which would give a smooth, but more quick, diffuse/taper.
But as you said, I think the big pipe is actually more effective. I think tapering at the coupling would be better than taking almost half the pipe length to taper/diffuse.
I had actually suspected (without any proof though) that the slow taper of the AMS one was too long, as in it tapered/diffused too slowly, and should maybe be done at most in about 8 inches from the small diameter side, which would give a smooth, but more quick, diffuse/taper.
But as you said, I think the big pipe is actually more effective. I think tapering at the coupling would be better than taking almost half the pipe length to taper/diffuse.
plain fact of the matter is when you have a volume differential you will have a pressure differential...which will result in a velocity differential. Doesnt take a rocket scientist to figure that out.
Whats in the pudding? The effect it has on the overall output of the car is negligible.
Whats in the pudding? The effect it has on the overall output of the car is negligible.
yup....pick one that you like...whether your deciding factor is the finish, the fitment, the mounting tabs, or the price... I wouldn't bank my decision on the angle of taper on the pipe.
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