My 1.6 Turbo Dyno Results
09-13-2013, 01:10 AM
#21
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I beg to differ. 
Exact same turbo, 2.5" V-band downpipe to 3" no cat... Ran into creep as well,
I even disconnected the wastegate entirely to trouble shoot but realized that the out of control creep still existed, so the problem is traced down to the turbine housings port being way to small..
Exact same housings, before and after. Yes I have 2 of these turbos, one is a spare so a perfect opportunity to showcase them side by side.
Note the black soot outline on the used left housing! Its a good idea since your in there to gasket match it to gain better flow, less lag which is exactly what I did as per right side ported housing.
You don't have to go to the extreme as mine and polish the housing (promotes higher exhaust gas velocity btw) but definitely should at least do what Braineack did on his, which has a similar shape to channel the gasses into the wastegate port.
Its hard to see this from my pic since I polished and smoothed mine out but the idea is the same. Keep in mind I am running a upgraded 1.5" flapper (yours is 1.25") and a Kinugawa billet wastegate : Results: boost creep? Whats that?!!
Exact same turbo, 2.5" V-band downpipe to 3" no cat... Ran into creep as well,
I even disconnected the wastegate entirely to trouble shoot but realized that the out of control creep still existed, so the problem is traced down to the turbine housings port being way to small..
Exact same housings, before and after. Yes I have 2 of these turbos, one is a spare so a perfect opportunity to showcase them side by side.
Note the black soot outline on the used left housing! Its a good idea since your in there to gasket match it to gain better flow, less lag which is exactly what I did as per right side ported housing.
You don't have to go to the extreme as mine and polish the housing (promotes higher exhaust gas velocity btw) but definitely should at least do what Braineack did on his, which has a similar shape to channel the gasses into the wastegate port.
Its hard to see this from my pic since I polished and smoothed mine out but the idea is the same. Keep in mind I am running a upgraded 1.5" flapper (yours is 1.25") and a Kinugawa billet wastegate : Results: boost creep? Whats that?!!
Last edited by NorthernlightR; 09-13-2013 at 02:13 AM.
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09-13-2013, 03:39 PM
#25
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Lol. Dumping a fixed amount of gases through a 1.25" diameter hole vs. 1.25" hole . Which one will evacuate the gases first! ..
Go ask companies that make variable size wastegates why they don't just use one size pistons and you will get your "and"
Or
Ask yourself why a 3" exhaust makes more power over the stock 2"...
Sure opening up the hole .5-1mm is trivial ok
But .250" makes a difference
You have your answer.
Nobody has to do what I did, the above method and pictures I posted is to help others see the merits of:
Simple fluid dynamics
Go ask companies that make variable size wastegates why they don't just use one size pistons and you will get your "and"
Or
Ask yourself why a 3" exhaust makes more power over the stock 2"...
Sure opening up the hole .5-1mm is trivial ok
But .250" makes a difference
You have your answer.
Nobody has to do what I did, the above method and pictures I posted is to help others see the merits of:
Simple fluid dynamics
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09-16-2013, 12:18 PM
#27
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that turbo had a severely undersized outlet to begin with. Look how much bigger the flapper area is compared to it. I've never dealt with a turbo like that, where I'm used the flapper just being maybe 2-4mm or so larger in diameter than the outlet.
There's also fear that if you do enlarge the hole that it's possible the extra exhaust gasses/pressure could force the wastegate open faster; but that sounds like a long math equation that I don't want to tackle.
also my comments were directed to that specific turbo itself: I have the same turbo; I don't have creep. The outlet doesn't need to be enlarged and there's little wiggle room to do so anyways.
There's also fear that if you do enlarge the hole that it's possible the extra exhaust gasses/pressure could force the wastegate open faster; but that sounds like a long math equation that I don't want to tackle.
also my comments were directed to that specific turbo itself: I have the same turbo; I don't have creep. The outlet doesn't need to be enlarged and there's little wiggle room to do so anyways.
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09-20-2013, 09:22 PM
#33
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that turbo had a severely undersized outlet to begin with. Look how much bigger the flapper area is compared to it. I've never dealt with a turbo like that, where I'm used the flapper just being maybe 2-4mm or so larger in diameter than the outlet.
There's also fear that if you do enlarge the hole that it's possible the extra exhaust gasses/pressure could force the wastegate open faster; but that sounds like a long math equation that I don't want to tackle.
also my comments were directed to that specific turbo itself: I have the same turbo; I don't have creep. The outlet doesn't need to be enlarged and there's little wiggle room to do so anyways.
There's also fear that if you do enlarge the hole that it's possible the extra exhaust gasses/pressure could force the wastegate open faster; but that sounds like a long math equation that I don't want to tackle.
also my comments were directed to that specific turbo itself: I have the same turbo; I don't have creep. The outlet doesn't need to be enlarged and there's little wiggle room to do so anyways.
Yes I agree with you 100% that a channel is all thats needed on this turbo, the process I did would be considered the "ultimate internal gate mod" lol, the step one would take if they don't want to go down the external wastegate route, but still want the same flow capability of a 38mm external gate, (exact same size) .
Last edited by NorthernlightR; 09-22-2013 at 09:17 PM.
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09-26-2013, 03:41 PM
#35
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Thanks lexintexan!
I blew my turbo inlet gasket yesterday so while I have the turbo off I plan to get it fixed up like the picture brain posted to rid of the boost creep. Brain, do you use the same flapper?
I am getting like extremely bad gas mileage. I talked to the tuner about it because I am running around mid 11s to mid 12s AFRs when cruising and he told me that it is like that because I would have a constant light load misfire when cruising (trying to stay the same speed) so he had to richen (that's not a word) it up to prevent that. Has anyone encountered this before and know of a fix or what's causing it?
I blew my turbo inlet gasket yesterday so while I have the turbo off I plan to get it fixed up like the picture brain posted to rid of the boost creep. Brain, do you use the same flapper?
I am getting like extremely bad gas mileage. I talked to the tuner about it because I am running around mid 11s to mid 12s AFRs when cruising and he told me that it is like that because I would have a constant light load misfire when cruising (trying to stay the same speed) so he had to richen (that's not a word) it up to prevent that. Has anyone encountered this before and know of a fix or what's causing it?
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09-26-2013, 06:41 PM
#37
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Haha, I was just referring to the guy who tuned my car because I don't trust myself enough. I had it running around there before I took it to him, it just misfired when I tried to cruise around
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09-26-2013, 10:49 PM
#39
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it only misfires at very light throttle, goes lean, no matter the RPM. As far as I know it's accurate. No I have not done a free air cal.
Edit: Sounded wrong
Edit: Sounded wrong
Last edited by Oochi; 09-28-2013 at 12:32 PM.
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