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Old 11-25-2005, 09:38 PM   #1 (permalink)
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Default bad wastegates limiting boost?

My car went to the dyno today with a newly installed menthanol kit from snow. The car was surging on the dyno (not bucking or missing), and we thought there was too much methanol. Also, turning the set up on the bc to 100 gave me only about 18 psi, with dr500s (I normally get 17psi with a 70 set). So, turned the methanol off and gave it a semi-run, still surging at higher boost levels (18)but not at 16-17 psi. Also the ic pipes were pretty hot which makes me wonder if the turbos arent being worked to death. Would wastegates cause this surging and prevent me from making more that 18psi? Or is this a turbo problem? I had never noticed this before because I never tried to run more than 18psi.
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Old 11-25-2005, 11:03 PM   #2 (permalink)
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Default Re: bad wastegates limiting boost?

i dont think that the wastegates would affect that...maybe your boost controller is screwed up

also...arent DR500s good for about that boost level to redline anyway? maybe the change in fuel has something to do with cleaner combustion/better volumetric flow characteristics and the turbos cant keep up as well

not sure, those are just random thoughts
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Old 11-26-2005, 04:30 AM   #3 (permalink)
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Default Re: bad wastegates limiting boost?

yes wastegate actuators will affect that. my turbos would drop a pound of boost off before i shimmed the actuators. now they don't
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Old 11-26-2005, 07:09 AM   #4 (permalink)
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Default Re: bad wastegates limiting boost?

the first step would be to do a pressure test.. you could be boosting the atmosphere instead of the engine with a significant leak. If everything checks out then I'd shim the actuators some.
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Old 11-26-2005, 11:30 AM   #5 (permalink)
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Default Re: bad wastegates limiting boost?

Is shimming the best way to go, or should I buy new actuators with say a 12 psi spring? I guess what Im asking is will shimming permanantly fix the problem or just maybe temporarily?
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Old 11-26-2005, 11:53 AM   #6 (permalink)
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Default Re: bad wastegates limiting boost?

Stock actuators have an adustable rod so you don't need to actually shim them... just increase the preload a bit. This will not harm anything. If you preload them too much you might increase the minimum boost you can run though. Regarding the surging, do you know it was true surging (did it sound like a choo choo train)? I had big dyno surging problems and it turned out to be partially related to mismatched wg actuators, and partially due to collapsing intake pipes that were choking off the turbos as the turbos created vacuum. Since you are running the stock acuators it would be easy to check to make sure they are working properly. Apply pressure to the actuator ports and verify they open at the same time.

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Old 11-26-2005, 01:51 PM   #7 (permalink)
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Default Re: bad wastegates limiting boost?

Quote:
Originally Posted by smoke
My car went to the dyno today with a newly installed menthanol kit from snow. The car was surging on the dyno (not bucking or missing), and we thought there was too much methanol. Also, turning the set up on the bc to 100 gave me only about 18 psi, with dr500s (I normally get 17psi with a 70 set). So, turned the methanol off and gave it a semi-run, still surging at higher boost levels (18)but not at 16-17 psi. Also the ic pipes were pretty hot which makes me wonder if the turbos arent being worked to death. Would wastegates cause this surging and prevent me from making more that 18psi? Or is this a turbo problem? I had never noticed this before because I never tried to run more than 18psi.

spark blow out...
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Old 11-26-2005, 05:17 PM   #8 (permalink)
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Default Re: bad wastegates limiting boost?

Crappy wastegates won't cause surge, they can cause spiking, overboosting, low boost, and no boost, but not power surging (not to be confused with compressor surging). Start looking into what your AFR is, check plug gap like Matt suggested.

Occam's Razor: It's probably the methanol kit, figure out what you screwed up installing it.
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Old 11-26-2005, 10:53 PM   #9 (permalink)
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Default Re: bad wastegates limiting boost?

Quote:
Originally Posted by SnakeSkinner
spark blow out...
The surging Im experiencing during 4th gear pulls on the dyno is a smooth surge. It sounds like more power for about 2-3 seconds and then less power for 2-3 seconds. I thought spark blowout was more like quick little misses in the power. Can spark blowout cause this kind of surging? Also, Matt what would you think about dr500s only making 18psi or so with the boost controller turned up all the way? What might be the problem? (The car was pressure tested right before going on the dyno).
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Old 11-26-2005, 10:57 PM   #10 (permalink)
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Default Re: bad wastegates limiting boost?

Quote:
Originally Posted by DJ_Duck
Crappy wastegates won't cause surge, they can cause spiking, overboosting, low boost, and no boost, but not power surging (not to be confused with compressor surging). Start looking into what your AFR is, check plug gap like Matt suggested.

Occam's Razor: It's probably the methanol kit, figure out what you screwed up installing it.
Would you explain to me what compressor surging means and what causes it?

AFR is 11.5/1 across, plugs have been gapped to about 32 but are iridium. Im putting in some coppers soon to see if that is the problem. Everything on the methanol kit seems to check out.
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