HELP! Super laggy stock turbo, 22psi @ 3800rpm
Apr 14, 2006, 10:59 AM
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HELP! Super laggy stock turbo, 22psi @ 3800rpm
Ok, guys, I am fricking stumped!!!! I have been working on this problem for the last 2 days and I cant figure it out
The problem is that I am hitting 22 psi by 3800 rpm
It all started when I put a UR LICP. It is REALLY laggy. So I did a boost leak test and found leaks over the place. (The brake booster line, vacuum line, boost gauge t-line, turbo outlet gasket and MBC t-line) But oddly enough, none at the LICP. So I fixed all the leaks and retested to find no leaks. Took it out for a drive and it was still the same crap!!!!!! However, the car did idle much better and the brake feel improved.
On another note, I just got Al’s Launch control flashed into the ecu, and its only hitting 4 psi at about 5750 rpm.
The weird thing is that, after I did the test and took the car out for a drive; a lot of white smoke came out of the exhaust, and smelled like oil. It stopped smoking after about 20 seconds.
So this morning, I switched back to the cars stock boost controller, and no change. However, the boost gauge reads spikes to 21 psi and drops down to around 15psi. I am not worried about that since I reset the ecu and figure it needs time to learn.
Any ideas what else I can test for. Are there any other solenoids that might of gone bad? What about a about MAS??
UPDATE 1:
ok, i did a couple of things yesterday.
i hooked up my stock boost controller, and it spooled to 19psi at 3500rpm or so.
then when i removed the mbc and just directly hooked up the lines, i saw 11psi, which is wastegate boost. is that about right? it would still take a while to spool up to that psi, and it seems to hang around the 5psi point for a while.
then i borrowed my friends mbc, which no change in spool up point.
am i getting the right wastegate boost?? is there a way to adjust the rod to make it stiffer?
UPDATE 2:
ok, this is what i did today.
i borrowed a friends BOV (forge), stock intake pipe and the LICP coupling i was missing. put all that on with the stock LICP and spool when down a tad bit, but the car pulled soooo much harder. i think that intake pipe was crap, or that my MAS is bad. i am gonna do another leak test tomorrow and change to my old MAS to see if that was the cause of less power.
here is another thing i found. it really hangs at 5psi for a long time. i mean you see it get to 5psi at around 2300 rpm, hangs at that for about 2-3 sec, then gradually quickly to 22psi.
could this be a bad wastegate where it might open up too soon? is there any way to adjust it?
The problem is that I am hitting 22 psi by 3800 rpm
It all started when I put a UR LICP. It is REALLY laggy. So I did a boost leak test and found leaks over the place. (The brake booster line, vacuum line, boost gauge t-line, turbo outlet gasket and MBC t-line) But oddly enough, none at the LICP. So I fixed all the leaks and retested to find no leaks. Took it out for a drive and it was still the same crap!!!!!! However, the car did idle much better and the brake feel improved.
On another note, I just got Al’s Launch control flashed into the ecu, and its only hitting 4 psi at about 5750 rpm.
The weird thing is that, after I did the test and took the car out for a drive; a lot of white smoke came out of the exhaust, and smelled like oil. It stopped smoking after about 20 seconds.
So this morning, I switched back to the cars stock boost controller, and no change. However, the boost gauge reads spikes to 21 psi and drops down to around 15psi. I am not worried about that since I reset the ecu and figure it needs time to learn.
Any ideas what else I can test for. Are there any other solenoids that might of gone bad? What about a about MAS??
UPDATE 1:
ok, i did a couple of things yesterday.
i hooked up my stock boost controller, and it spooled to 19psi at 3500rpm or so.
then when i removed the mbc and just directly hooked up the lines, i saw 11psi, which is wastegate boost. is that about right? it would still take a while to spool up to that psi, and it seems to hang around the 5psi point for a while.
then i borrowed my friends mbc, which no change in spool up point.
am i getting the right wastegate boost?? is there a way to adjust the rod to make it stiffer?
UPDATE 2:
ok, this is what i did today.
i borrowed a friends BOV (forge), stock intake pipe and the LICP coupling i was missing. put all that on with the stock LICP and spool when down a tad bit, but the car pulled soooo much harder. i think that intake pipe was crap, or that my MAS is bad. i am gonna do another leak test tomorrow and change to my old MAS to see if that was the cause of less power.
here is another thing i found. it really hangs at 5psi for a long time. i mean you see it get to 5psi at around 2300 rpm, hangs at that for about 2-3 sec, then gradually quickly to 22psi.
could this be a bad wastegate where it might open up too soon? is there any way to adjust it?
Last edited by elhalisf; Apr 16, 2006 at 10:32 AM.
Apr 14, 2006, 11:03 AM
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22 psi at 3800 sounds right. spiking to 21 psi and falling to 15 by redline on stock ECU is correct.
Only building 4 psi of boost on Dynoflashes 2-step seems a little odd, i think i heard 16 before?
That's about all the info i got.
Only building 4 psi of boost on Dynoflashes 2-step seems a little odd, i think i heard 16 before?
That's about all the info i got.
Apr 14, 2006, 11:06 AM
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when i had the stock LICP and the stock cat back (while still having the 3" downpipe/testpipe) i was hitting full boost by 2800 rpm. also, it used to spool much much quicker.
i talked to AL yesterday, and he said that 22psi @ 3800rpm does not seem right
i thought a LICP is supposed to reduce lag, not increase it
i talked to AL yesterday, and he said that 22psi @ 3800rpm does not seem right
i thought a LICP is supposed to reduce lag, not increase it
Apr 14, 2006, 11:11 AM
#7
Full boost by 2800rpm? Ok...
Well, like I said, on every dyno sheet I have, you can see my Evo hit peak torque right around 3800rpm. Before 3000, there is 0 power whatsoever.
Have you tried going back to the previous setup to see if you go back to earlier-than-possible-spool?
Well, like I said, on every dyno sheet I have, you can see my Evo hit peak torque right around 3800rpm. Before 3000, there is 0 power whatsoever.
Have you tried going back to the previous setup to see if you go back to earlier-than-possible-spool?
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Apr 14, 2006, 11:14 AM
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well, i am gonna put back my stock cat back today to see the difference. however, i cant do that for the LICP since i had to cut and use the coupling to the turbo outlet pipe.
but ya 22psi @ 2800rpm. had that setup for about 3 months. i thought my lag would be less with all the parts i put on.
but ya 22psi @ 2800rpm. had that setup for about 3 months. i thought my lag would be less with all the parts i put on.
Apr 14, 2006, 11:14 AM
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Originally Posted by elhalisf
i was hitting full boost by 2800 rpm. also, it used to spool much much quicker.
I honestly think that if somebody is going to make this recockulous claim, they need to back it up with a boost vs. rpm log chart.
I see about 7psi by 2600 rpm, and yes I have the boost log to back that up. From about 5-6 different cars so far.
Some cars hit full boost even higher. Don't confuse full boost with peak trq.
Last edited by razorlab; Apr 14, 2006 at 11:16 AM.
Apr 14, 2006, 11:22 AM
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20+psi at 2800 revs? I mean, can see 20psi by 3100 revs by my ENTIRE cold side turbo piping is modified along with my intake and exhaust being complete....so I saw significant increases along these lines, but 2800 revs seems as if you misinterpreted something.
I'd take your word for it, but a 1k rpm drop...how about this, put the stock pipe back ON and see what happens. Return the pieces one by one...and see where it goes.
I'd take your word for it, but a 1k rpm drop...how about this, put the stock pipe back ON and see what happens. Return the pieces one by one...and see where it goes.
Apr 14, 2006, 11:34 AM
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Originally Posted by razorlab
I have been seeing alot of this lately.
I honestly think that if somebody is going to make this recockulous claim, they need to back it up with a boost vs. rpm log chart.
I see about 7psi by 2600 rpm, and yes I have the boost log to back that up. From about 5-6 different cars so far.
Some cars hit full boost even higher. Don't confuse full boost with peak trq.
I honestly think that if somebody is going to make this recockulous claim, they need to back it up with a boost vs. rpm log chart.
I see about 7psi by 2600 rpm, and yes I have the boost log to back that up. From about 5-6 different cars so far.
Some cars hit full boost even higher. Don't confuse full boost with peak trq.
like i said, i would love to put the stock LICP on, but i dont have the coupling. however, i am gonna put the stock catback on.
also, i am not talking about peak torque. i wouldn't know that unless i dynoed the car. i am talking about full boost according to what my gauge reads. And ofcourse, 2800 rpm is by no means an accurate number
Apr 14, 2006, 11:48 AM
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Originally Posted by razorlab
Human eye logs aren't very accurate. 
but my observations of 22psi@2800rpm then to 22psi@3800rpm is a comparison basis. and my "testing" methods use the same human eye, and i see a major difference.
the question is that, is there anything else that could be wrong to cause later spool. what is that other solenoid that is in the back of the intake manifold. did a compression test, i got 155-155-155-160, so i know i am fine there. could i have a bad mas, would that affect my spool?