Forced Induction Custom FI Setup Questions

2.25 exhaust too small?

Old 04-26-2005, 01:08 AM
  #1  
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Default 2.25 exhaust too small?

well i just lost 3psi from getting the down pipe (2.5") welded to the rest of the exhaust2.25" i use to make 7-8psi with just the downpipe alone, but now i can't go pass 5psi. Did the smaller exhaust decrease the psi? i just bought a boost controller as well and tried to increase the boost but it was solid at 5psi and will not go pass 5, ( ihi rh5)
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Old 04-26-2005, 01:12 AM
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Default Re: 2.25 exhaust too small?

you got a leak somwhere if the boost controller isnt working...
ps. no offence but why do you still post here when people are just gonna flame you?
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Old 04-26-2005, 01:19 AM
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Default Re: 2.25 exhaust too small?

flame me for a stupid question? well, i just ask a question that im confuse about . but there is no leak it was running great with the down pipe alone, but it was too loud thats why i decided to get it attach to the rest of the exhaust.
but when its detach i get the 7-8psi. im thinking that the problem is that the exhaust is too small.
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Old 04-26-2005, 01:33 AM
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Default Re: 2.25 exhaust too small?

no not about the question i just remember in the past people just didnt like you? anyway did you try disconnecting the DP after you connected the exhaust to see if the psi goes back up?
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Old 04-26-2005, 01:53 AM
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Default Re: 2.25 exhaust too small?

u running a cat?
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Old 04-26-2005, 05:18 PM
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Default Re: 2.25 exhaust too small?

yes, i have tried disconnecting the dp and the psi did went back up to 7-8psi.
yes iam running a stock cat.
but when i connect the downpipe to the full exhaust, i lose 3psi.

and on the flaming part and who ever don't like me, i really don't care, since lots of my friend knows my pw for this account , they like joking or do stupid things with my account, so some of the past post it wasn't me.
but o well..
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Old 04-26-2005, 05:22 PM
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Default Re: 2.25 exhaust too small?

well i think whiterice could be right, your cat is restricting too much so buy/make a stright pipe
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Old 04-28-2005, 09:54 AM
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Default Re: 2.25 exhaust too small?

I ran a stock cat and 2.5 DP with 2.25 exhaust for a while. I still hit 8psi no problem.
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Old 04-28-2005, 12:06 PM
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Default Re: 2.25 exhaust too small?

Originally Posted by bumblezc
I ran a stock cat and 2.5 DP with 2.25 exhaust for a while. I still hit 8psi no problem.
you could turn up the mbc and get the psi back. i had the same as bumble, but when i put a test pipe in, i gained 3 psi.
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Old 04-28-2005, 01:56 PM
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Default Re: 2.25 exhaust too small?

I run open DP at the track everytime I went and still held at 8 psi. No major spikes or creep. Just good old fashion fast spooling!
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