Stock o2 too restrictive for 400+ whp?
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Stock o2 too restrictive for 400+ whp?
Im trying to set up my car for 400whp using an Fp Green. I currently have a UR turboback but with the stock o2 housing. I was curious if this may be a limiting factor in achieving my 400whp goal.
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I made 480 on the stock o2 housing. soon to be well over 500 whp on e85 fp red combo. The housing restriction is so short and so close to the turbo that the losses are not as big as many make them out to be.
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tephra we barely made more on stock dump after switching to a Green.
put a bigger/better dump in = more power...
is that 480 at the fly?
That was at the wheels with mfred from the boards doing the tunning
put a bigger/better dump in = more power...
is that 480 at the fly?
That was at the wheels with mfred from the boards doing the tunning
Last edited by 3dman1; Nov 30, 2010 at 06:44 AM.
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I guess i dont see it. Its the same size outlet as the turbo and around 4 or 5 inches long im sure there is some restriction there but 25 whp when its the same size as the outlet to the turbo? I will just say i dont believe it and i havent seen it yet on my car based on comparisons to other cars with simular builds.
#12
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I guess i dont see it. Its the same size outlet as the turbo and around 4 or 5 inches long im sure there is some restriction there but 25 whp when its the same size as the outlet to the turbo? I will just say i dont believe it and i havent seen it yet on my car based on comparisons to other cars with simular builds.
On the Evo 8/9, just swapping out the O2 housing to a better design would gain 10-15whp.
That ~25whp gain was also on a bigger than stock turbo and also on 91 oct. You probably won't see the same gain on 93 oct.
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It may be about the same size as the turbine wheel outlet, but the outlet dumps into a very large area. Then, it has to squeeze down to the small hole again. If you want to try, run a 6" exhaust all the way to the muffler of your car and put a 2 1/8" hole at the end.
On the Evo 8/9, just swapping out the O2 housing to a better design would gain 10-15whp.
That ~25whp gain was also on a bigger than stock turbo and also on 91 oct. You probably won't see the same gain on 93 oct.
On the Evo 8/9, just swapping out the O2 housing to a better design would gain 10-15whp.
That ~25whp gain was also on a bigger than stock turbo and also on 91 oct. You probably won't see the same gain on 93 oct.
#14
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I remember the early days of the Evo 10 when AMS was saying that there was nothing to gain by going to a larger O2 housing. IIRC, the issue is that the turbo has a very long extension from the turbine out let to the O2 flange, and its relatively small diameter, so there is a bunch of flow restriction there, and beefing up the O2 housing has a minimal relative effect. I imagine that there is something to be gained with going to a better housing, but its not going to be a 30+ whp difference. Its likely no better than the Evo 8/9 which is usually around a 10-15 whp difference.
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