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single vs twin discussion

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Old Nov 5, 2013 | 04:26 PM
  #21  
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You could always just run 1, and tell the pcm they are all on the same bank, and run it after the merge.

On the twin side, it seems like most smaller turbos are less efficient (on the compressor map) but the power difference can easily be made back up by the hotside (lower backpressure). Also the power it takes to accelerate a wheel goes up by the square of the radius (so even if the wheels weigh the same, the smaller diameter still wins).
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Old Nov 5, 2013 | 05:43 PM
  #22  
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mine worked for a long time but when it really needed to do trims the banks would fight each other. so i just had to turn them off and do wide band tuning. i have thought about just puting them side by side in the down pipe. that way they get the same readings.
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Old Nov 5, 2013 | 08:08 PM
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I'm not sure that will work. Without the tune being tweeked. The 02's side by side will not any change bank to bank. Exp. if t tells the pass to add fuel n it sees both o2 go richer. Then it takes fuel from which side?
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Old Nov 6, 2013 | 01:02 AM
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Originally Posted by TURBHOE
mine worked for a long time but when it really needed to do trims the banks would fight each other. so i just had to turn them off and do wide band tuning. i have thought about just puting them side by side in the down pipe. that way they get the same readings.
iv had that same problem with them fighting each other. you can watch them just flip back and forth.
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Old Nov 6, 2013 | 02:30 AM
  #25  
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Any time the left bank adds fuel the right side sees it and then it trys to lean out after that they just start fighting. if you could isolate each side you wouldn't have that problem. i had this issue with two trucks so far, mine included. so i just turned them off and on long trips i just bring my laptop and data log then make changes when i get gas. take all of 2 minutes to do tops.
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Old Nov 6, 2013 | 09:46 AM
  #26  
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A T6 S480 with a spool valve is going to be hard to beat for ease, cost, power, and transition time. The hardest part will probably be fitting a large enough (3.5"-4") down pipe.
A pair of smaller turbos with the same power potential, and amazing spool time/transition time will be easier on the downpipe side---a pair of 3" pipes will go right where the stock exhaust goes.
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Old Nov 6, 2013 | 06:50 PM
  #27  
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I was referring to setting this table to the passenger side only (all 1s should be bank 2) and try it.

This table is used when using on motors with different firing orders (like when retrofitting an LSx PCM to an SBC or LT1). It tells the PCM which bank the injectors are on.

It should be ok with only 1 sensor, many GM V6s only use 1 pre cat O2 sensor.
Attached Thumbnails single vs twin discussion-bank-select.png  
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Old Nov 7, 2013 | 11:56 PM
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i have never tried this. seems like it may make them fire incorrectly.
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Old Nov 11, 2013 | 03:12 PM
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Originally Posted by TURBHOE
i have never tried this. seems like it may make them fire incorrectly.
I don't think it should be an issue. firing order is hardcoded in the PCM, can't change it. This table *should* just tell the PCM which cylinders are using which O2 sensor.
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Old Nov 11, 2013 | 07:18 PM
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its worth a shot i guess. worse case it floods a few cyl and you just shut it off.
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