Setup:
stock b18 ls with arp head studs and rod bolts
Pfab manifold
Ebay turbo.48
Turbonetics deltagate mark 2 wastegate with 3-5psi spring no boost controller
This is a new motor(only 600 miles) when I geton it it builds 8psi then falls off to three yhen back to 8 and does this over and over until about 4800 then stays at 4psi until shift then srarts all over
I have checked my piping and have no boost leaks what else could it be besides creep and how do I cure it
Well to start you should have the wastegate signal coming from after the intercooler (i.e. cold side charge pipe). This will help with the "sag" up top.
It sound to me like you have a boost leak though. Check your couplers and clamps.
See I thought this also I had it gettingg vacum from the intake mani and it did the same thing so I called tubonetics and they told me to run it straight to the turbo
And ive pressurized my piping with 20psi over night with no leak down
Not yo sure on that man. Wg placement is good on the manifold and if the dump is opem it should have no problem breathing. Only over boosting around mid rpm? 3k-4.5ish?
So its surging up 4psi above gate. It drops back to regular after 4500? Or 5k. So after peak torque.
To much fuel. Horrible ignition timing and that 48ar sounds like it has something to do with it. Just a suspision. If the wastegate is 100% that is. Lake sure the shaft is clean and pressure test it and see how iy responds. Set a regulator and bump it. If the valve doesn't pulse right you can tell.
didnt know that about the cam gear thanks and I think the turbo is my problem to but im gonna change some stuff around when I get some time and probably put my other turbo back on
If the wastegate is ran to the turbo and you think its the problem I would get an extra piece of the intercooler piping thread it then put the wastegate source to it to see if its still happening.
Im pretty sure I used a 3/8 NPT bit threaded side to go into the piping. With the other side 1/8 or somthing for the wastegate line. To drill it you can use a 37/64 drill bit to get it drilled out. Then get the 3/8 npt tap and you should be all set.
I know it took me a min to figure out what i needed so I hope this helps.
I think the sizes in the link above are messed up and I might be wrong about the 1/8 size just check the size of your line and make sure it sits tight on the barb.
shows the barb stickin out of the piping. The barb can be placed in any piping b4 the throttle body and connects to the wastegate.
Kinda hard to see. And i didnt take a good pic of this when setting it up.
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