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Old 05-24-2009, 10:14 PM   #1
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Default i'm hitting target boost 500rpm late...why?

turbo hardware is tight, no exhaust leaks that I know of, intercooler clamps are tight, motor is just as strong when in boost and makes no fuxored noises, AFR is normal...is the cat clogged?
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Old 05-25-2009, 12:42 AM   #2
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Maybe your tach is off?
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Old 05-25-2009, 12:55 AM   #3
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Why do you have a cat? You don't strike me as the tree hugging type! I would think a cat, clogged or not would be enough to kill some pretty decent spool.
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Old 05-25-2009, 12:58 AM   #4
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Yea.....are you really still running a cat?
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Old 05-25-2009, 01:16 AM   #5
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What kind of timing are you running? You could always pull less timing to spool the turbo faster.
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Old 05-25-2009, 01:46 AM   #6
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How did you verify that there were no exhaust leaks?
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Old 05-25-2009, 02:03 AM   #7
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It is jeolus of my 5psi greddy kit. LOL

Did you get a testpipe from enthuza? Try it in place and see if it fixes it.
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Old 05-25-2009, 02:17 AM   #8
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Quote:
Originally Posted by Link View Post
What kind of timing are you running? You could always pull less timing to spool the turbo faster.
He posted this spark map in my dyno thread to help me out a while ago:



From what I've gathered it's dialed in pretty well, I don't think that's the issue.
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Old 05-25-2009, 02:37 AM   #9
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Quote:
Originally Posted by Link View Post
What kind of timing are you running? You could always pull less timing to spool the turbo faster.
first, that didn't work on the dyno...more advance = earlier spool.

second, why did it change?

Quote:
Originally Posted by jayc72 View Post
How did you verify that there were no exhaust leaks?
feather-duster at the joints, lol.
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Old 05-25-2009, 02:41 AM   #10
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is your boost line expanading :P did your car loose a bunch of weight?
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Old 05-25-2009, 02:59 AM   #11
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I'd bet you've got a leak between manifold and turbo. You stated in another thread that the hardware was loose on a number of occasions during a track day. This seems like the most likely place to start looking.
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Old 05-25-2009, 03:02 AM   #12
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Quote:
Originally Posted by jayc72 View Post
I'd bet you've got a leak between manifold and turbo. You stated in another thread that the hardware was loose on a number of occasions during a track day. This seems like the most likely place to start looking.
i just remembered that and posted it. Going to check it out tomorrow.
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Old 05-25-2009, 04:58 AM   #13
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Quote:
Originally Posted by hustler View Post
turbo hardware is tight, no exhaust leaks that I know of, intercooler clamps are tight, motor is just as strong when in boost and makes no fuxored noises, AFR is normal...is the cat clogged?
How is it late? As in later than you would like or later than before? If it is later than before, mani to turbo leak is most likely. Or loose WG actuator. Or something else. In that order.
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Old 05-25-2009, 11:18 AM   #14
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what was that stove/vent sealant you chinamen were using for a while? I might try that.
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Old 05-26-2009, 04:25 AM   #15
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Was this a relatively sudden change (like a week or two, or even just one day) or just compared to a few months ago? Higher ambient temps than before? Clogged air filter?
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Old 05-26-2009, 10:18 AM   #16
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Quote:
Originally Posted by matttheniceguy View Post
Was this a relatively sudden change (like a week or two, or even just one day) or just compared to a few months ago? Higher ambient temps than before? Clogged air filter?
it did this after the first track day.
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Old 05-26-2009, 03:26 PM   #17
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damn, the turbo and the downpipe have a good seal on the feather-duster test...clogged cat? I guess I need to pressure test the intercooler pipes too but they seem like they're all tight with a good seal.
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Old 05-27-2009, 01:37 AM   #18
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WTF is a feather-duster test? Did you try a length of vacuum hose in the ear test?
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Old 05-27-2009, 08:49 AM   #19
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Quote:
Originally Posted by jayc72 View Post
WTF is a feather-duster test? Did you try a length of vacuum hose in the ear test?
Small air leaks will displace the feathers on the duster, showing you where air (exhaust) is escaping the system.
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Old 05-27-2009, 10:01 AM   #20
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Quote:
Originally Posted by BradC View Post
Small air leaks will displace the feathers on the duster, showing you where air (exhaust) is escaping the system.
Reminds me when i suggested to someone on m.net they use a tissue to do the same test. They refused claiming it would catch on fire and the car would explode.
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