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Old 04-30-2002, 07:32 PM   #1
racerwad
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Question wastegate control questions for TT

ok, so i was wondering if any of the standalone ECU's have the ability to control two wastegates? i contacted AMR and they said that while the link does not have this ability, it should be possible to have one solenoid control two wastegates. this sounds like a good idea to me. does anyone know if this could work? for all intents and purposes, it should work. can anyone think of why it wouldn't? thanks.

andy
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Old 04-30-2002, 07:38 PM   #2
kastle
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In theory, when I had the TT setup on my RS, Shiv and I figured that the TEC-II could control both of the wastegates. We never did get a chance to play with it....
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Old 04-30-2002, 07:55 PM   #3
SubbyRS
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I presume you're talking parallel turbos (like Skyline GT-R) & not sequential (like Legacy TT or Mazda RX-7)??

I could imagine one solenoid controlling 2 wastegates in parallel, but it'd be trickier getting 2 sequential wastegates controlled....
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Old 04-30-2002, 08:11 PM   #4
racerwad
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Default ought to work, right?

kastle-

you're the one person i was hoping could response. i know that you were never really able to get the car running the way you would've liked; however, could you clarify how your wastegates were controlled? were they both controlled by the same solenoid? also, once you have a twin TB setup, will the TEC-II(or III) be able to control two TPS sensors?

subbyrs-

the turbos are definately in parallel. i couldn't even imagine the hassle of trying to home engineer a sequential setup!
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Old 04-30-2002, 08:28 PM   #5
kastle
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They were being controlled by the internal wastegate settings... So, at that time, we weren't using the boost solenoid at that time. The plan was to use the TEC-II to control it over the wastegate settings, since we didn't think we could install 2 Tial's due to space contraints.

Also, it's not a great idea to have the solenoid (GPO settings) control all the boost (no wastegate spring) since it makes a lot of noise (according to Shiv) when activated (ie, more activity = more noise).

I won't be doing anything further with the TT setup since I have given it back to Robert to allow him to further tweak the prototype and get it into production. I didn't give that much though (twin TPS's), but that's a really good question.

Last edited by kastle; 04-30-2002 at 11:00 PM.
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Old 04-30-2002, 08:42 PM   #6
racerwad
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the two TB with the doubling of all the associated hardware and software was the main reason i was skeptical of the dual TB idea. if it were possible to do the engineering properly (and by no means do i think FAT isn't able!) then the dual TB solution would be a fairly elegant one. i don't think it's really going to work though at controlling the turbos from overboosting one another. i think what the setup needs is either a larger intercooler or some sort of plenum that can be pressurized before the charge reaches the TB. that way the pressure differentials can be equalized (if not completely, then to a greater extent) by the volume of a larger intercooler or plenum. you'd lose some boost, but gain a TT.

i for one am willing to deal with the increased noise of a solenoid controlled wastegate versus depending on the vagrancies of individual springs on each wastegate to control overboost. just my .02 cents.

andy
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