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judeisnotobscure
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« on: August 31, 2011, 07:19:03 PM »
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I haven't heard too many people discuss this, but kfwdksmx
is where to open the throttle plate earlier, instead of the stock map that many ots companies still run. I got the idea to look for it from that jhm 1/4 mile video where they said the throttle opens sooner in the credits.
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« Last Edit: September 01, 2011, 05:49:53 AM by judeisnotobscure »
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I have a b5 s4
but i just want to dance.
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nyet
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« Reply #2 on: August 31, 2011, 08:41:17 PM »
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The consensus seemed to be it didn't make much difference .. but please let us know if you see results
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Rick
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« Reply #3 on: September 01, 2011, 12:37:44 AM »
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I have been opening mine early for a long time, but in reality it doesn't make a difference as the engine still isn't being throttled enough to cause a restriction at those low rpms.
Rick
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NOTORIOUS VR
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« Reply #4 on: September 01, 2011, 05:09:48 AM »
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Meh I let mine open 100% by 2500 or 3000 (can't remember which now)... I've noticed no difference at all.
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Snow Trooper
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« Reply #5 on: September 01, 2011, 10:06:50 AM »
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It only matters on big turbos. My throttle is 100% right out of idle rpm.
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cartoons?
6A 61 72 65 64 40 76 6C 6D 73 70 65 63
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judeisnotobscure
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« Reply #6 on: September 01, 2011, 10:17:37 AM »
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It only matters on big turbos. My throttle is 100% right out of idle rpm.
That's along the lines of what I was thinking. can u coment on the differnce if you open the throttle later. |
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I have a b5 s4
but i just want to dance.
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Rick
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« Reply #7 on: September 01, 2011, 10:38:21 AM »
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A bigger turbo and more boost actually makes throttle plate angle less important. If you have ever tuned alpha n, atmospheric pressure is reached at very small throttle openings at low rpm.
Rick
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Snow Trooper
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« Reply #8 on: September 02, 2011, 12:26:39 PM »
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Well it makes a 800-1000 rpm difference in spool so I am going to stick with my line of thought.
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cartoons?
6A 61 72 65 64 40 76 6C 6D 73 70 65 63
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Snow Trooper
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« Reply #9 on: September 02, 2011, 12:36:29 PM »
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It only matters on big turbos. My throttle is 100% right out of idle rpm.
That's along the lines of what I was thinking. can u coment on the differnce if you open the throttle later. With the map stock an no other changes with timing/afr or anything to try and spool faster it was a huge difference. 25psi wasn't happening until 4500-5000. With it revised I can be fully spooled by 3500-3800 |
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cartoons?
6A 61 72 65 64 40 76 6C 6D 73 70 65 63
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judeisnotobscure
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« Reply #10 on: September 02, 2011, 12:39:08 PM »
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Wow, those are pretty substantial gains.
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I have a b5 s4
but i just want to dance.
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nyet
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« Reply #11 on: September 04, 2011, 02:37:25 PM »
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I still don't get how opening the throttle earlier would make a difference in a big turbo kit that spools SLOWER than k04s?
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NOTORIOUS VR
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« Reply #12 on: September 04, 2011, 02:40:45 PM »
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I still don't get how opening the throttle earlier would make a difference in a big turbo kit that spools SLOWER than k04s?
I agree... your spool isn't limited by flow of the TB but rather the turbo itself. |
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judeisnotobscure
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« Reply #13 on: September 04, 2011, 02:48:25 PM »
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I think of it as relieving some pressure off the charge air side. like running a pump with the discharge valve 1/2 open vs. full open. I agree that the major hold up is on the hot side, but every little bit should help.
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I have a b5 s4
but i just want to dance.
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Snow Trooper
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« Reply #14 on: September 04, 2011, 04:11:42 PM »
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When I really think about it and try to picture why it doesn't make sense. But fact is that on all drive by wire cars that I have messed with this is the case.
It is heavily documented on newer suby stuff also.
Maybe the bigger turbos fight against the flow restriction where as small frame turbos fight to fill. One thing I know for sure is that the whole limited throttle angle thing is intended for smooth operation or "refinement" as Bosch puts it.
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cartoons?
6A 61 72 65 64 40 76 6C 6D 73 70 65 63
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