4ringpieces
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« Reply #60 on: March 16, 2017, 08:11:39 AM »
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Reduce back pressure pre turbo and you'll gain power top end
Less pre turbo pressure the better.
I've seen on a engine dyno a non vwg engine go from 320 to 350bhp by changing to a larger turbine housing and reducing overlap via verniers, lost a little low end spool and torque but huge gain at the top
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TijnCU
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flying brick
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« Reply #61 on: March 17, 2017, 01:22:32 AM »
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You will tend to find switching the cams to closed just after peak boost/spool is the best imo.
I have a VVT tensioner for my new block, and I will experiment with it! Low end gains are always welcome to me  Sticking to ME7 for now  |
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Awaken
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« Reply #62 on: March 18, 2017, 05:13:52 PM »
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Awaken, if you find out more, please let us know. Im currently trying to find out the same thing then you, i dont understand how i have to edit this values to take effect.
Br
I was advised by a friend who's a really good mapper to bring up the VVT control "on" up to 5000 rpm. He said he has tested on another S3 with similar big turbo and there were some gains in terms of spool time. I haven't dynoed the car, but it feels alright. |
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« Last Edit: March 18, 2017, 05:17:18 PM by Awaken »
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4ringpieces
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« Reply #63 on: March 19, 2017, 05:56:50 AM »
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Stock vvt k04 switch over is 4500rpm,
K04 is at full boost by 3500rpm
So takes 1000rpm after full boost it before it switches over.
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Awaken
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« Reply #64 on: March 21, 2017, 02:22:55 PM »
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Stock vvt k04 switch over is 4500rpm,
K04 is at full boost by 3500rpm
So takes 1000rpm after full boost it before it switches over.
At least for the S3 with K04 it is up to 4000, not 4500, but that doesn't matter much. The question is for a bigger turbo can we go more RPM over full boost, say if full boost is 4500, can we go with overlap up to 6000, has anyone tried something similar and does it gain anything? |
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« Last Edit: March 21, 2017, 02:38:08 PM by Awaken »
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prj
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« Reply #65 on: March 21, 2017, 04:15:06 PM »
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The discussion is waste of time.
It needs to be tuned on the dyno.
Overlap up to 6000 rpm is probably too much even for a GT35R.
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KasperH
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« Reply #66 on: March 21, 2017, 05:45:01 PM »
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I threw caution to the wind and just tried it out on my k03s (I know it spools fast in the first place ) Set it from 1300-3000 RPM and from 30% load. I don't know if it's a pseudo effect but it feels like it spools faster and smother, and the car feels more driveable in low load/city driving I'm going to make some logs and compare this weekend |
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nyet
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« Reply #67 on: March 22, 2017, 11:31:14 AM »
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I don't know if it's a pseudo effect but it feels like it spools faster and smother, and the car feels more driveable in low load/city driving IMO there is no way you can know this w/o a dyno. It may not even show up in logs unless you are extremely meticulous about taking logs (only change one thing at a time in the bin, same road, same conditions, etc). |
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KasperH
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« Reply #68 on: March 22, 2017, 12:15:50 PM »
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Im going to be as scientific as i can, taking multiple logs of cam control off and on(only thing changed) with completely reset trims on the same road, same direction, after a similar cooling run maybe its a waste of time, maybe it isn't. there's only one way to find out. and it gives me a cuple of hours of something "productive" to do  |
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nyet
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« Reply #69 on: March 22, 2017, 01:17:33 PM »
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Just keep in mind even something as simple as changing when you roll on the throttle can alter spool.
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KasperH
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« Reply #70 on: March 22, 2017, 03:21:21 PM »
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My thought was setting cruise control to the same speed each run, and just clapping the throttle to 100% |
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Norwegian1.8T
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« Reply #71 on: June 10, 2021, 11:59:09 AM »
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Did anyone try enabling VVT via the maps Fukenbroken stated? I tried enabling it on my 032 HJ and the cam switching works great, but my rlmax_w is cflatt lined for soem reason? Anyone had the same issue?
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