Just dynoed and tuned the a/f ratio on my car yesterday.
My setup is:
T3 RB20 skyline .50 a/r cold, .40 a/r hot ball bearing full spool at 3500RPM
450cc DSM injectors
intercooler and 2.5" piping, 2.5" downpipe, 1.8" catback exhaust
NGK bkre7 plugs and wires
TurboEdit
My peak hp is 155.7 @ 6100RPM
and the peak torque is 158 @ 5100RPM
Mustang dyno reads 4.5psi of boost, gauge reads 6psi of boost
I have a couple of questions/problems:
Car is smoking really bad, pale white smoke and little blue starts at 6000RPM
(could it be that the turbo exhaust seal is shot? or just running rich?)
Can’t seem to boost past 4.5psi, checked all the piping, no leak, internal wastegate is suppose to actuate at 10psi. Wastegate vacuum is plumbed behind the intake manifold.
BOV set at soft and hard, still the same boost
I just changed my plugs last night and retightened all the plumbing/charge pipe couplings. It does not smoke as much anymore on regular driving. It is Idling fine and the boost gauge reads about 18 HG of vacuum at idle.
1.8" cat back maybe ur problem. Move up to a 2.5"and no cat or 2.5" cat. Did u try the dyno with an open dp. im haveing same problems and my mechanic says that my exhaust is too restrictive 2" resonator, so i ordered some 3" piping and a magnaflow turbo muffler 3"inlet 4" tip
yep too much restriction on exhaust = pressure on turbine and then you may break the seals. oil may leak into turbine, burn and make that blue smoke.
my opinion only…
If it’s an internal gate, it sounds like you might have the same problem that I just fixed. I was only getting around 5 psi at redline, and it had me stumped. It ended up being the wastegate not preloaded properly. This happens alot with used turbos from being banged around, etc. Mine was leaving the waste gate open 1/4". Most of the time you can bend the bracket to where it needs to be, but I had no room, so I had to cut a piece out of the actuator arm, and weld it back together.
Ok i’m gonna try to play around w/ the internal wastegate. It might be bent or loose. If it is I’m just gonna shift the mounting bolts further away so it will pull the rod. I think I remember it having a little bit of play.
How much tension is the rod suppose to be at? Like really really tight or just snug?
retightened the wastegate mounting bolts, the gauge reads abou 6-6.5psi now Before I did it, the rod had lot of play going up and down and back and forth now it’s snug shut.
i think my seals on the exhaust turbine side is shot though,
make sure the drainline is not kinked and it is completely downhill. even the fitting in the pan needs to be pointing slighly up. when you use a bulhead fitting on the pan it faces slighly down from the angle of the face of the pan.
i hade this problem with my setup, i was running open downpipe for about a month, boosting 11psi, then i was tired of the noise and bolted up my stock exhaust, the car would only boost 7 psi, a day later i started blowing alot of white smoke and a little blue mostly white though, i unhooked the exhaust nothing changed still white smoke, took the turbo off no more smoke, so i got the turbo rebuilt and a new 3" exhaust no more white smoke :burnout: it was kind of a phenominon i cant spell anyway i could never figure out why it was white, i was running only oil to the turbo and if the seals were bad it should burn oil which burns blue, i couldnt figure it out :crazy:
But if the oil is not burning in the combustion chamber, would it be the graying pale white smoke instead of blue?
I smoke a lot on stop and go traffic. or on WOT. So lets say I’m on the highway and I let the gas pedal off, that’s when it will start puffing pale white smoke.
I understand that when you let off throttle it goes to super rich for a second. Do you think I have leaky injectors? Duty cycle messed up?
When I got it tuned I wasn’t burning as much fuel as before but I can still smell fuel on idle (from the exhaust).
Before I did it, the rod had lot of play going up and down and back and forth now it’s snug shut.