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#285
by
justiz00
on 20 Sep, 2013 12:40
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Was that compressor surge 27-32 seconds in the video?
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#286
by
Jetmugg
on 20 Sep, 2013 12:48
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I don't know about surge, but it was building boost very quickly at that point.
I want to get the corresponding video from inside the cab posted this evening. That video should show rpms and boost, but may not be able to see the EGT's from the GoPro footage.
Does anyone know a way to directly embed the video link in this forum software (so the video appears directly in a forum post). I can't figure it out.
http://www.youtube.com/watch?v=1NYikOly9S0Steve.
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#287
by
RabbitJockey
on 20 Sep, 2013 13:05
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that is definitely a concerning sound. but it could just come down to the acoustics of the room or something, but i'd be wanting to look in to that.
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#288
by
Jetmugg
on 20 Sep, 2013 13:14
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I think that was a "full boost" run, with the wastegate essentially blocked off (unintentionally due to improper plumbing). I hear the sound you are describing, but don't have a good idea what caused it or what to do about it.
I know that I need to get the boost controller plumbed properly, so that I actually have some way to control the boost.
I don't know that running the full 30psi (never opening the wastegate) is "proper". I'm thinking that I should be a bit lower than that on boost, while still retaining the ability to adjust it as needed.
Steve.
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#289
by
RabbitJockey
on 20 Sep, 2013 14:43
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did you notice that sound during the dyno session?
the only thing you can do about that sound if it is surge is to either increase flow or lower boost pressure, that or get an antisurge compressor housing(ported shroud)
proper working wastegate should help make more power and low egt too.
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#290
by
theman53
on 20 Sep, 2013 14:52
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I would definitely like to see what the EGT, boost, and RPM were at that point. Seems like there is a little bit of smoke until it lights the turbo. It also seems like you are short shifting it a bit, if you let the Rpms climb a bit more so there is a bit more flowing through the engine you might not get that smoke as bad and it may help light the turbo.
BTW, great work on getting it done and hopefully having a shot at this.
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#291
by
theman53
on 20 Sep, 2013 14:54
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I don't know about surge, but it was building boost very quickly at that point.
I want to get the corresponding video from inside the cab posted this evening. That video should show rpms and boost, but may not be able to see the EGT's from the GoPro footage.
Does anyone know a way to directly embed the video link in this forum software (so the video appears directly in a forum post). I can't figure it out.
http://www.youtube.com/watch?v=1NYikOly9S0
Steve.
I don't think our forum supports it. There is no way to do it that I have found yet, hence the random safe youtube video thread in the general section just linked.
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#292
by
745 turbogreasel
on 20 Sep, 2013 15:21
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On my boost regulator, I had to file a tiny notch in the ball seat, much like a bleed, but internal.
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#293
by
Jetmugg
on 20 Sep, 2013 15:58
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Re: Short shifting - I totally agree that winding out each gear will be better on the salt. The dyno guy wanted me to short shift so that I could get into 4th gear at less than 2000 rpms, then "roll on" the power from there.
One of my weekend projects is to re-plumb the boost controller, in the hopes of having some control over it.
The biggest question in my mind is still "How high should I let the EGT's climb on the salt?"
I'm going to do some work tonight, trying to get the GoPro footage loaded, edited, and YouTubed.
Steve.
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#294
by
Jetmugg
on 20 Sep, 2013 15:59
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On my boost regulator, I had to file a tiny notch in the ball seat, much like a bleed, but internal.
Very interesting. I have not heard of this before. Can you share any additional info?
Steve
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#295
by
Jetmugg
on 20 Sep, 2013 18:19
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OK - here's the in-cab video for the same dyno pull (I think). The clarity of the gauges is not great, but you should be able to tell what's going on.
The gauge on the far right of the dash is boost. Straight up on the needle (12:00 position) is 25 psi.
The far left gauge is EGT. Straight up on that gauge is 1250F.
Straight up on the tach is 6,000 rpm.
http://www.youtube.com/watch?v=cC_moP40R5A
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#296
by
justiz00
on 20 Sep, 2013 18:24
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I would definitely like to see what the EGT, boost, and RPM were at that point.
When I have experienced surge in the past the boost gauge would pulsate with the engine RPM because more air physically could not be pushed in.
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#297
by
theman53
on 20 Sep, 2013 19:56
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I cannot tell what is going on in my screen. I think you could do many miles with 1250f
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#298
by
745 turbogreasel
on 21 Sep, 2013 04:39
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My MBC is and adjustable steam valve form Mc Master Carr about like so
http://www.dempseybowling.com/perform/grainger.htmI forget what I actually did to it, ( tiny triangle file maybe?) but I had to make a small groove where the ball closes.
It's been on there probably 6 years without me having to service it in any way.
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#299
by
theman53
on 21 Sep, 2013 05:16
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