2 1/4 downpipe and 1 7/8 exhaust
#3
Re:2 1/4 downpipe and 1 7/8 exhaust
9psi is 9psi, it could just be that you got a ---- turbo with a low cfm rating compressor wheel, exhaust should really be the diameter of the hole on the turbine side that the downpipe bolts up to
#4
Re:2 1/4 downpipe and 1 7/8 exhaust
It could be that the excess backpressure is causing your turbine to spool slowly. That would make the set up reach peak boost slower and you won't get the "mashed to the seat" feeling as much with a larger exhaust.
So, yes, if you're refering to the feeling of acceleration. A larger exhaust (2.25 atleast) will cause your turbine to spool relatively faster reaching peak boost lower in the powerband and increasing acceleration.
if you want to do it on the cheap, go to a exhaust shop and ask to rummage through their bins, grab a good length of 2.25 pipe rom a truck or something, find some worn out hangers, and go buy a couple silenced glasspacks. then either have a friend weld it up for you or rent a buzz box. it'll cost you like 50 bucks if you're true ghetto.
So, yes, if you're refering to the feeling of acceleration. A larger exhaust (2.25 atleast) will cause your turbine to spool relatively faster reaching peak boost lower in the powerband and increasing acceleration.
if you want to do it on the cheap, go to a exhaust shop and ask to rummage through their bins, grab a good length of 2.25 pipe rom a truck or something, find some worn out hangers, and go buy a couple silenced glasspacks. then either have a friend weld it up for you or rent a buzz box. it'll cost you like 50 bucks if you're true ghetto.
#5
Re:2 1/4 downpipe and 1 7/8 exhaust
Originally Posted by surfer
9psi is 9psi, it could just be that you got a ---- turbo with a low cfm rating compressor wheel, exhaust should really be the diameter of the hole on the turbine side that the downpipe bolts up to
#8
Re:2 1/4 downpipe and 1 7/8 exhaust
You can get a 2.5" ss midpipe on ebay for around $100 shipped. It's OBX, but it's not half bad for the price. It's 304 stainless mandrel bent with a built in resonator. I have one on my car now but I'm not boosting yet, so I can't vouch for how it is under boost. It's actually a little worse NA, but I expected that. It's an option and it won't break the bank.
#9
Re:2 1/4 downpipe and 1 7/8 exhaust
ok I took my complete turbo and mani off yesterday and I had a few leaks that I fixed and I extended the wastegate actuator rod so it only boosts to 5.5 psi.Now it boosts but it dont hit full boost till 7000rpm and for some reason it will goto 8000 on a stock pm6.It pulls hard at 7200rpm but I know that now where it should be boostin.I checked the turbine for oil and there was none so I know the turbo is fine? Any ideas?
Thanks
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