Clipped turbos??
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Joined: Mar 2001
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From: japan
you got it backwords
when you clip you loose response.
clipping cuts off the corners of the blades so more air can flow through them at higher rpm so you loose response because it takes more air to spin up the turbin because there it less pich on the blades.
clipping cuts off the corners of the blades so more air can flow through them at higher rpm so you loose response because it takes more air to spin up the turbin because there it less pich on the blades.
You do not necessarily loose respone. It is more complex than that and also depends on other mods made to the engine at the same time.
They remove material from the outter edge of the turbine blades. This reduces the inertial of the total rotating mass. Thus the turbo will spool up faster due to the weight reduction. But
this also reduces the efficiency of the turbine to harness the exhaust energy and reduces back pressure. Thus do you loose more here than was made due to weight reduction? Reduced back pressure means more power at the higher revs. Is more gain by reduce back pressure than lost by efficiency?
What happens when the engine is ported and running higher boost, you might actual gain at low and high because the stock
setup is too restrictive.
The only way to be sure, is before and after dyno tests.
They remove material from the outter edge of the turbine blades. This reduces the inertial of the total rotating mass. Thus the turbo will spool up faster due to the weight reduction. But
this also reduces the efficiency of the turbine to harness the exhaust energy and reduces back pressure. Thus do you loose more here than was made due to weight reduction? Reduced back pressure means more power at the higher revs. Is more gain by reduce back pressure than lost by efficiency?
What happens when the engine is ported and running higher boost, you might actual gain at low and high because the stock
setup is too restrictive.
The only way to be sure, is before and after dyno tests.
You definately loose low end response with clipped turbos!
Not sure how many of you have driven a 3rd gen with clipped turbo's, but I have. There is a big difference in the boost at low RPM's. However, the very top end of the power curve is better than stock. I guess it just takes awhile for the "less rotational resistance" to make up for the "loss of turbine efficiency."
I did not like the clipped turbo's because I am an autocrosser, and I need the low end response all the time. I would have actually been slower with this "upgrade". The car I had the clipped turbo's on was a track car, and the previous owner said that he liked the clipped turbos on the track because he always ran higher RPM's.
My opinion is that the clipped turbo mod is one of those mods that is all hype, and not much performance. I don't see many people who have had this mod done raving about how pleased they are with the results. It is pretty easy to talk-up a mod that is strictly based on theory, but little data.
Anyone?????
My experience is that you don't gain enough on the top end to pay for the loss at the low end. Just my $.02.
Jeff
Not sure how many of you have driven a 3rd gen with clipped turbo's, but I have. There is a big difference in the boost at low RPM's. However, the very top end of the power curve is better than stock. I guess it just takes awhile for the "less rotational resistance" to make up for the "loss of turbine efficiency."
I did not like the clipped turbo's because I am an autocrosser, and I need the low end response all the time. I would have actually been slower with this "upgrade". The car I had the clipped turbo's on was a track car, and the previous owner said that he liked the clipped turbos on the track because he always ran higher RPM's.
My opinion is that the clipped turbo mod is one of those mods that is all hype, and not much performance. I don't see many people who have had this mod done raving about how pleased they are with the results. It is pretty easy to talk-up a mod that is strictly based on theory, but little data.
Anyone?????
My experience is that you don't gain enough on the top end to pay for the loss at the low end. Just my $.02.
Jeff
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