Tuesday, January 09, 2007 - 05:00 pm, by: Brett Lauria(Brett_lauria)
i have just finnished my single conversion when boost starts it feels like injector cut what could it be.the wastegate has been taken off i dont know if they cut the fuel off when over boosting.also the fuel pump runs on after the ignition is turned off and the fuel pump only runs 30-25psi could i be in for a new fuel pump?
Steven Nanevski DieHard NSW HKS 264/264 Cams are in, Cheering....
Monday, January 22, 2007 - 06:44 pm, by: Daniel Clarke(Dieseltrain)
You need a wastegate to controll the boost. It would be trying to spool up to 90,000psi for all you know. BUT it will be boosting PAST the factory 14.2psi fuel cut.
You had no problems before because the factory turbo has an internal wastegate that was limited to 10-11psi fromt he factory.
Why would you not run a wastegate of some sort? Whether internal or external? Its just something that must be used in any type of turbo setup.
Tuesday, January 23, 2007 - 11:03 am, by: Chris Davey(Chris_davey)
I agree. No wastegate is not a good idea. If you have a provision for it on your manifold then put one on. A tial 38mm would probably do the job. Or you could take a chance on a ebay cheapie.
You need to give us all the details on your setup so that we can give you advise.
Thursday, January 25, 2007 - 11:51 am, by: Brett Lauria(Brett_lauria)
its being run with the wastegate ports bunged off until i pass my roadie,then i already have a garret 38mm wastegate with a screamer to put on after it passes
Thursday, January 25, 2007 - 02:00 pm, by: Sean Butler(Pyro_15)
a waste gate is not a blow off valve. it is necessary to control the presure created in your turbo. It's not a show off feature like an atmospherice blow off valve.
Brian Timms Tinkerer New South Wales TT Soarer Goodness.
Thursday, January 25, 2007 - 02:10 pm, by: Brian Timms(Turbo_brian)
As Sean said, a Wastegate and BOV are 2 VERY VERY different items, and most people confuse them.
a BOV is used to vent the boost when you get off the gas as you change gears (this is used to stop the air reverse pressuring the turbo fins and stressing the turbocharger).
A Wastegate is used to alter the amount of exhaust passing through the actual turbo fins, thus controlling the boost levels. The more gas pushes through the turbo's fins, the more boost it can potentially push. Without a wastegate, you either have SFA exhaust going through the turbo (I had this when I snapped the flat of my internal gate hinge), and the car might be lucky to push maybe 1 or 2 PSI if you have enough exhaust, but if you have the gate perminantly shut, you will come on boost strong, and it will rise as fast as your engine rises.
If you do not have a waste gate (again, been in that situation with my old S13), it will hit boost cut, and literally feel like you have crashed into a wall, then suddenly taken off again, it's quite harsh on the drive train of any car.
I think by Waste gate, your reffering to a BOV, and the problem your describing sounds similar to my recent issue of coming in har for maybe half a second before not holding the power, but still revving out.
I had a faulty spring in my BOV, the spring was to small, and the valve would open up as the car started to come onto boost, so I would get the initial hit of boost before it drained out into nothingness again.
I took the spring, stretched the sh!t out of it, re-fitted the now stretched and double-long spring into the valve, and went for a drive, and I kid-you-not, the car now scares me it gets the power down that hard!!!!
If you have bunged up the hole where your old BOV used to live, check your not leaking boost, can you hear it hissing audibley??
Get it onto a Dyno machine for a quick diagnostics, if it's loosing boost it will become obviously apparent the second it's on the dyno, and if it's not leaking boost from the BOV or another obvious place, they will smoke test it, and it will show you the leaking area within 5 mins, and cost next to nothing on diagnostics.
B.
Scotty Wheeler Tinkerer TAS Soarer TT (Converted To Single)
Tuesday, January 30, 2007 - 05:03 pm, by: Scotty Wheeler(Typhus_sw)
i think when he said screamer he meant screamer pipe off the external waste gate he has, which is illegal unless its plumbed into the exhaust... therefor it won't pass an inspection with the screamer pipe unless he get's it plumbed back into the exhaust, and his car probably won't even see the inspection if he doesn't put the waste gate on... My advice is to put the waste gate on and don't worry about the screamer pipe, just plumb it into your exhaust... screamer pipes might b ok for a month or two but trust me they get annoying as i have one on my car, and will be getting it plumbed back into the exhaust after i fix some other issues i have...
Thursday, February 15, 2007 - 04:42 pm, by: Brett Lauria(Brett_lauria)
ok the wastegate has been plumbed back into the exhaust but now even with the lines hooked up it still boost cuts does this mean the spring tention on the wastegate is to tense?or would a boost controller fix this?it obviously needs more pressure to open the wastegate how do i do this without running to much boost in my motor
Thursday, February 15, 2007 - 11:04 pm, by: Dennis Weglehner(2jzr31)
You need a softer spring in the gate. Boost controllers can only raise boost above spring pressure not lower it. Find out what type of spring it has in it. Ask whoever you got it from.
Also did you or the mechanic hook up the boost lines? Make sure its done right. If you stuff this up it wont work.
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