Forced Induction Custom FI Setup Questions

no downpipe

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Old 02-13-2005, 10:32 PM
  #11  
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Default Re:no downpipe

I actually read somewhere that too little of backpressure hurts spool up. Even with 3" exhaust everyone is running you still have that much more backpressure. Maybe that makes since :P
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Old 02-14-2005, 01:32 AM
  #12  
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Default Re:no downpipe

Originally Posted by jecu
I actually read somewhere that too little of backpressure hurts spool up. Even with 3" exhaust everyone is running you still have that much more backpressure. Maybe that makes since :P
this could be it or a weak vac source for the wastegate
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Old 02-14-2005, 01:51 AM
  #13  
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Default Re:no downpipe

i think he's got a boost leak, try tighting ur fittings
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Old 02-14-2005, 01:59 AM
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Default Re:no downpipe

Originally Posted by jecu
I actually read somewhere that too little of backpressure hurts spool up. Even with 3" exhaust everyone is running you still have that much more backpressure. Maybe that makes since :P


The theory behind this is that internal wastegates were designed when there was backpressure so when you have no backpressure than the internal wastegates will slightly leak. I don't know if this is true or not but its a theory I've heard
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Old 02-14-2005, 02:27 AM
  #15  
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Default Re:no downpipe

frank fulls spool by 4500, your ---- it fuckt too, my t3/t4 on my d series spooled 16 lbs by 3800 your runnin a 42/48 trailor trash turbo
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Old 02-14-2005, 10:53 AM
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Default Re:no downpipe

Originally Posted by hotrex
frank fulls spool by 4500, your ---- it fuckt too, my t3/t4 on my d series spooled 16 lbs by 3800 your runnin a 42/48 trailor trash turbo
I also have a stupid ------ non ported hf mani, crush bent pipes, flex pipe, so im sure that might be part of the reason. not to sure, but its a pretty decent assumption.

and a trailer trash 42/48? its pushin the same amount of boost as that wasted sc61 you think is so bad ***.
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Old 02-14-2005, 10:56 AM
  #17  
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Default Re:no downpipe

Originally Posted by junkyard racer
and a trailer trash 42/48? its pushin the same amount of boost as that wasted sc61 you think is so bad ***.
comparing 4psi from a .42/.48 to a SC61 is like night and day. Not even a comparison
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Old 02-14-2005, 10:57 AM
  #18  
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Default Re:no downpipe

we did not have a gasket for the bov so that might be the prob.
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Old 02-14-2005, 11:14 AM
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Default Re:no downpipe

Originally Posted by AbaZ
Originally Posted by junkyard racer
and a trailer trash 42/48? its pushin the same amount of boost as that wasted sc61 you think is so bad ***.
comparing 4psi from a .42/.48 to a SC61 is like night and day. Not even a comparison
my point was, hes pushin 8psi out of a sc61.
to each his own.
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Old 02-14-2005, 04:15 PM
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Default Re:no downpipe

carb spring that beast and see what happens. Mitsus are likely to have bad wastegates.
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