Still only hitting 5psi
#1
Still only hitting 5psi
Ok I am at a loss.
I have been having this odd boost issue. I will let the car completly warm up, go for a drive, and only can hit 5psi MAX. It runs smooth 5psi all the way to 6k where it hits a brick wall. Im told this is fuel cut, so I never go above 5.5k.
Now recently, on odd days I could hit 8psi+ no problem. I was chalking this all upto a dying turbo, bad sticking wastegate, So I bought a low miliage, great conidition stock S4 turbo. I cleaned it, ported the wastegate, and replaced the WG actuator lines. Its supposidly has 30k off a JSPEC, so the next to non shaft play kinda got my hopes up.
Fast forward to this weekend, I swap turbos. I get the new one on, and get rid of the cracked exhaust manifold and missing downpipe to straightpipe gasket. I took the time to port the wastegate, well withing reason. I Hop in the car, warm it up and I hear a kinda odd sound, a tat-tat-tat _____ tat-tat-tat____ you get the idea. I figure its my loose twin scroll tube hitting the downpipe/motor- and take it for a test drive. BAM 5psi. Nothing more, other then a great spool time and quiter and smoother ride.
My idle is still random as hell. When I first started it, 950, shut it off, started it, 700, shut it off- 1200, then to 1500. Then it pulsed a little, then it settles at 1500.
Sometimes when in gear, it will drop to 1200, im assuming this is due to a bad neutral saftey switch.
I have a Rtek 1.5, walbro, and new fuel filter on the way. Im thinking mines clogged because it seems even at 5psi I am running lean.
Any input welcome .
I have been having this odd boost issue. I will let the car completly warm up, go for a drive, and only can hit 5psi MAX. It runs smooth 5psi all the way to 6k where it hits a brick wall. Im told this is fuel cut, so I never go above 5.5k.
Now recently, on odd days I could hit 8psi+ no problem. I was chalking this all upto a dying turbo, bad sticking wastegate, So I bought a low miliage, great conidition stock S4 turbo. I cleaned it, ported the wastegate, and replaced the WG actuator lines. Its supposidly has 30k off a JSPEC, so the next to non shaft play kinda got my hopes up.
Fast forward to this weekend, I swap turbos. I get the new one on, and get rid of the cracked exhaust manifold and missing downpipe to straightpipe gasket. I took the time to port the wastegate, well withing reason. I Hop in the car, warm it up and I hear a kinda odd sound, a tat-tat-tat _____ tat-tat-tat____ you get the idea. I figure its my loose twin scroll tube hitting the downpipe/motor- and take it for a test drive. BAM 5psi. Nothing more, other then a great spool time and quiter and smoother ride.
My idle is still random as hell. When I first started it, 950, shut it off, started it, 700, shut it off- 1200, then to 1500. Then it pulsed a little, then it settles at 1500.
Sometimes when in gear, it will drop to 1200, im assuming this is due to a bad neutral saftey switch.
I have a Rtek 1.5, walbro, and new fuel filter on the way. Im thinking mines clogged because it seems even at 5psi I am running lean.
Any input welcome .
#6
Boosting Again
with a bigger wastegate of course your only gonna get 5.5 psi. sicne stock actuator has a 5.5psi spring meaning the wastegate opens at 5.5psi adn lets all extra gases out. you need a boost controller to raise boost.
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#8
Junior Member
Join Date: Sep 2003
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7.5 psi for a S5 =)
just goto a local parts shop and get a small air check valve, and the vaccum fittings for the end, chances are the guys in the parts store will be able to direct you to what you need. If I had a digi-cam I would show you a pic of mine. Just remember the teflon tape on the threads
just goto a local parts shop and get a small air check valve, and the vaccum fittings for the end, chances are the guys in the parts store will be able to direct you to what you need. If I had a digi-cam I would show you a pic of mine. Just remember the teflon tape on the threads
#9
RX-7 Alumni
Actually the S5 has the same problem (the 5 psi limit) if you connect the WG right to the turbo outlet with no boost controller. The S5 had a EBC built in.
Go with a MBC or EBC and you should have no trouble boosting higher--and with the Rtek you won't need a FCD.
Go with a MBC or EBC and you should have no trouble boosting higher--and with the Rtek you won't need a FCD.
#11
I live in an igloo
Join Date: Jul 2004
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It probably only hit 5psi until you removed emissions becuase of an intake/vac leak! It has to be, I mean if the pressure only holds till 5psi, its blowing out somewhere..
#13
Originally Posted by torean
please post the how to make my own ghetto boost controller...i been looking for a while with no luck
And no, my car ran fine with no emissions for months.
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