18 psi on a stock turbo?????
is there much more you can do to an s5 wg? i agree though. 18psi is too much. you arent gaining any power just a bigger chance of detonation. detonation is rotary speak for death.
He has an aftermarket ecu and doesn't know if his injectors are stock. Reading comprehension.
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From: carteret nj
ok i just went back to the guy who i bought then car from and i got the injectors that spouse to be ecu set for now they are 1200cc on top and stock rebuild one on the bottom and it a tuned jdm spec j ecu dont no whats the chip in it
I dont mean to thread jack but yeah. When I first swap my Tii in (3' dp RB etc, N374 with knight sport chip. I loved the boost and kept flooring it. Didnt know I boosted 15-18 lbs until I got a boost gauge. I even did it after I learned about running lean at high psi with stock injectors. I just couldnt help it when a Honda pulled up. But it still made 3 round trips to MN and IA (about 3-4 hours each way). But it does idle weird now but boost still comes in really good.
Joined: Feb 2001
Posts: 29,798
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From: London, Ontario, Canada
Holy **** this thread of full of failed reading comprehension... The guys said he has upgraded ecu(probably chipped SPECIFICALLY TO RUN THIS SETUP), injectors, and turbo, yet people still say OMG 18 PSI on all stock stuff say bye bye engine!!!
READ DAMNIT PEOPLE!
READ DAMNIT PEOPLE!
I still over boost. I dont think there's much you can do if you have a free flow exhaust. I even have some plates in my exhaust for some back pressure....Still not enough.
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Flange side...
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open wastegate....
Heres what I did to try and not over boost. Completely removed the internal gate and flapper door. Made the hole bigger, and put a Tial 38mm.
I still over boost. I dont think there's much you can do if you have a free flow exhaust. I even have some plates in my exhaust for some back pressure....Still not enough
I still over boost. I dont think there's much you can do if you have a free flow exhaust. I even have some plates in my exhaust for some back pressure....Still not enough
I've got my S5 turbo ported to the equivalent area of a single 35mm, and I have no creep at all. 2.5+" open exhaust system. Without my MBC, it runs exactly 5.5-6PSI max in 4th/5th gear.
2ndpink, those giant, rough ports have got to be causing all sorts of turbulence in the exhaust gas flow both through the wastegate and through the turbine. I wouldn't be surprised if your spool times are longer than with the stock setup. This could also be enough to restrict flow out of the external wastegate, which would explain why you still have creep at 38mm. As is, that whole semi-square chamber you created allows exhaust gas to flow back and forth between the 2 halves of the exhaust manifold, and the path isn't smooth. That kind of setup would probably work better on a S4 turbo (1 wg port), but smoothing things out / reducing the open space should help too.
2ndpink, those giant, rough ports have got to be causing all sorts of turbulence in the exhaust gas flow both through the wastegate and through the turbine. I wouldn't be surprised if your spool times are longer than with the stock setup. This could also be enough to restrict flow out of the external wastegate, which would explain why you still have creep at 38mm. As is, that whole semi-square chamber you created allows exhaust gas to flow back and forth between the 2 halves of the exhaust manifold, and the path isn't smooth. That kind of setup would probably work better on a S4 turbo (1 wg port), but smoothing things out / reducing the open space should help too.
Boost ahoy!
Joined: Jan 2006
Posts: 968
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From: Joplin, MO
This thread has convinced me to get a BNR Stage 1 instead of porting my WG. It will solve my exhaust leak *when I put the new gasket on* and the random smoke that puffs out under boost, and the coolant leak. WOOO.
pwned
Joined: Sep 2005
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From: Northern Indiana
2ndpink, those giant, rough ports have got to be causing all sorts of turbulence in the exhaust gas flow both through the wastegate and through the turbine. I wouldn't be surprised if your spool times are longer than with the stock setup. This could also be enough to restrict flow out of the external wastegate, which would explain why you still have creep at 38mm. As is, that whole semi-square chamber you created allows exhaust gas to flow back and forth between the 2 halves of the exhaust manifold, and the path isn't smooth. That kind of setup would probably work better on a S4 turbo (1 wg port), but smoothing things out / reducing the open space should help too.
my exhaust size is ported as much as it could be and in combo with a 3" turbo back and highflow cat/muflers i get no spikes or overboosting. partly because my flapper door pushrod was disconnected for a few weeks. and i wondered why it hit 10 at 5500 hahaha
I've got my S5 turbo ported to the equivalent area of a single 35mm, and I have no creep at all. 2.5+" open exhaust system. Without my MBC, it runs exactly 5.5-6PSI max in 4th/5th gear.
2ndpink, those giant, rough ports have got to be causing all sorts of turbulence in the exhaust gas flow both through the wastegate and through the turbine. I wouldn't be surprised if your spool times are longer than with the stock setup. This could also be enough to restrict flow out of the external wastegate, which would explain why you still have creep at 38mm. As is, that whole semi-square chamber you created allows exhaust gas to flow back and forth between the 2 halves of the exhaust manifold, and the path isn't smooth. That kind of setup would probably work better on a S4 turbo (1 wg port), but smoothing things out / reducing the open space should help too.
2ndpink, those giant, rough ports have got to be causing all sorts of turbulence in the exhaust gas flow both through the wastegate and through the turbine. I wouldn't be surprised if your spool times are longer than with the stock setup. This could also be enough to restrict flow out of the external wastegate, which would explain why you still have creep at 38mm. As is, that whole semi-square chamber you created allows exhaust gas to flow back and forth between the 2 halves of the exhaust manifold, and the path isn't smooth. That kind of setup would probably work better on a S4 turbo (1 wg port), but smoothing things out / reducing the open space should help too.
Its a 3" Down Pipe and exhaust. No cats. Also, my mistake on the "still not enough" I have a .9 bar spring (13psi) and boost happens fast! Kinda hard to drive on low throttle and stay below 1 or 2 psi (so the gate doesnt start to open and sound retarded loud)
Another thing, after the slits were on the exhaust will not pass 7 psi after 6,500 RPMs.
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