Gizmo20VT
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« Reply #30 on: November 26, 2012, 05:38:28 AM »
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Thank you for additional input PRJ
If im understanding you correclty your talking about the check valve that is in the PCV system?
I deleted this as I did a catch can install, so valve cover and Block T into one line into catch can, then back into TIP. The nipple at the bottom of the intake is also blocked off.
All vacuum lines have been replaced with silicone lines.
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prj
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« Reply #31 on: November 26, 2012, 06:08:56 AM »
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Ok, then you most likely removed that valve.
I guess it's time for you to start looking at hardware...
What kind of exhaust manifold do you have? What cams do you have? How is the cam timing setup?
If your cams are timed incorrectly, it can easily cause this.
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« Last Edit: November 26, 2012, 06:10:33 AM by prj »
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Gizmo20VT
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« Reply #32 on: November 26, 2012, 06:22:41 AM »
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Ok, then you most likely removed that valve.
I guess it's time for you to start looking at hardware...
What kind of exhaust manifold do you have? What cams do you have? How is the cam timing setup?
If your cams are timed incorrectly, it can easily cause this.
My Motor is stock bottom end and top end. Nothing has been touched motor wise, removed the k04 and bolted the GT2871R on, The manifold custom steam pipe made from one of our local guys.  |
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prj
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« Reply #33 on: November 26, 2012, 07:06:06 AM »
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Well, if there's nothing else, then it's probably the exhaust housing being too big.
That looks like a T3 flange to me, and you should be running a 0.63 A/R housing.
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ibizacupra
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« Reply #34 on: November 26, 2012, 07:24:51 AM »
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stock displacement 1.8t and 0.8x hotside is going to be laggy... 0.6x hotside T25 flanged internal gated version I did a few years ago on an A3TQ spooled mid 3krpm and full on 4krpm, 1781cc also
Is this turbo used? (damaged cartridge perhaps? Is it noisy when spooling down?) I've heard noisy bearings on these and they've been slow to spool also.. (my own damaged gt35 hybrid is slower to get going with its damaged chra bearings)
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Bische
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« Reply #35 on: November 26, 2012, 08:37:00 AM »
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Oh, my housing is an internal gated T25 .64, its not going to fit with that manifold/DP..
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prj
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« Reply #36 on: November 26, 2012, 08:40:21 AM »
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0.82 T3 is huge for a 1800cc motor.
I think that's the main problem, and it should 500 rpm earlier with the 0.63.
Get that changed and then start working on the tune.
Right now the turbo is mismatched. By the time it comes on boost, the compressor is already working hard, and you can't rev higher because the compressor is going to max out.
So your power band will basically just not exist. A GTX3071R / 0.63 would give you about this spool and more top end. or a GT3076R/0.63.
For the 0.82 housing to make any sense you would need about 2.1-2.2 liters of displacement.
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« Last Edit: November 26, 2012, 08:44:56 AM by prj »
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Gizmo20VT
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« Reply #37 on: November 26, 2012, 01:10:14 PM »
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0.82 T3 is huge for a 1800cc motor.
I think that's the main problem, and it should 500 rpm earlier with the 0.63.
Get that changed and then start working on the tune.
Right now the turbo is mismatched. By the time it comes on boost, the compressor is already working hard, and you can't rev higher because the compressor is going to max out.
So your power band will basically just not exist. A GTX3071R / 0.63 would give you about this spool and more top end. or a GT3076R/0.63.
For the 0.82 housing to make any sense you would need about 2.1-2.2 liters of displacement.
I have a 0.86 as its a T2 housing not a T3 housing, Yes the turbo was purchased in a used condition with with barely 500kilos to it and really no strange noises either  Did another run tonight after removing the Wastegate and removing the gasket, doing a straight bolt onto manifold, there was a small black marking on the edge of the gasket which might have been a slight leak. Perhaps not but here is another log from tonight The LDRXN has been shifted more inline with boost delivery, and the WGDC seems to respond better?   First run AFR was running pretty well, second log the probe threw code again  |
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prj
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« Reply #38 on: November 26, 2012, 01:15:05 PM »
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This is not even nearly right.
Your spool is 1000 rpm late.
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s5fourdoor
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« Reply #39 on: November 26, 2012, 02:48:36 PM »
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This is not even nearly right.
Your spool is 1000 rpm late.
so concise. |
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elRey
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« Reply #40 on: November 26, 2012, 02:58:57 PM »
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N75 duty should be 100% until pid-d kicks in. You're leaving a ton of spool on the table with that log.
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Gizmo20VT
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« Reply #41 on: November 26, 2012, 03:15:10 PM »
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N75 duty should be 100% until pid-d kicks in. You're leaving a ton of spool on the table with that log.
Thanks elRey but this is still a very basic map, Was just trying to get WGDC back as this was the previous log This was before LDRXN was set to match the boost curve.  |
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fredrik_a
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« Reply #42 on: December 11, 2012, 04:57:43 AM »
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I'm not sure this will help at all, but I had a similar challange and I placed
a plate (removed the wastegate) to force all exhaust gas into the turbine at all
times and then shut the boost deviation function off completely to see when my
boost started rising at WOT (just keep an eye on a separate boost gauge to avoid a
blown angine) and despite these actions my boost didn't show up as early as I
expected. Checked for leaks but no problems, changed the turbo charger to another
one with smaller turbine housing and then did the test again and it all workd fine.
At the end of the day, I had a too large turbine housing.
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Gizmo20VT
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« Reply #43 on: December 11, 2012, 10:43:25 PM »
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I'm not sure this will help at all, but I had a similar challange and I placed
a plate (removed the wastegate) to force all exhaust gas into the turbine at all
times and then shut the boost deviation function off completely to see when my
boost started rising at WOT (just keep an eye on a separate boost gauge to avoid a
blown angine) and despite these actions my boost didn't show up as early as I
expected. Checked for leaks but no problems, changed the turbo charger to another
one with smaller turbine housing and then did the test again and it all workd fine.
At the end of the day, I had a too large turbine housing.
I will be changing to a .64 in the new year, when I do rods. Will see the result from once thats done, still havent replaced my wideband probe, Will continue with the project in the new year  |
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itemonsale
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« Reply #44 on: September 24, 2013, 05:30:20 PM »
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How did that go? with the .64 turbine? what is ur spool time now
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