Car dies when the BOV is blocked off - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 03-26-2009, 02:30 PM   #21
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ok I so i got the car to idle the the BOV sealed up. It idling stupid rought. Like at 600 rpm rough.

The thing is now my vaccum is only about 4in vs when leaking though the BOV of 15. I am in the middle of building a vaccum leak testers right now.
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Old 03-26-2009, 03:40 PM   #22
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Originally Posted by Braineack View Post
all i know is I was able to do it. i could idle the car, then i couldn't rev it
i can confirm this, i did it yesterday.
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Old 03-26-2009, 08:55 PM   #23
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OK so after having Doppleganger come over and bouncing ideas around I think I finally figured out what the f**k is going on.

Oh yea welcome to once in a blue moon

So after playing with a few things Mike figured out the turbo seemed to me sucking in more air. Well so we tested the theory with his car and so be it. So we figured out that my car is starting to build pressure at idle. So this makes no sense cause I never seen a car start building pressure at idle ever. Well after playing with the car more, leaking the BOV, playing with the FPR we notice that if I remove air from entering the intake manifold or increase the fuel pressure the amount of suckage from the turbo decreased.

So after thinking things about, I have a theory that seems to make sense and only I would have this problem lol. Ok so I am running a stupid small turbo. Well the car is leaning out a idle(which I knew I was a little lean originally but not this bad) causing my EGTs to increase. This increase of EGT is causing the exhaust gases to increase their speed over the turbo. Those spooling the turbo more at idle then a normally. This is why my BOV was blowing air out instead of sucking like normal. Also explains why my vaccum is so messed up.

After talking to Ben91, we agreed that if anything(for a quick style fix) I should adjust my AFM to richen the car up. So the plan over the weekend is to pick up a narrow band gauge(since I can then reuse the gauge for when I finally get a WB) to test if the car is just stupid lean and then to adjust the AFM to richen the car up.

Thanks to everyone for all the ideas and to the people that talked about the car leaning out cause that made me think of how leaning a car will increase spool ever so much.
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Old 03-27-2009, 01:44 AM   #24
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Originally Posted by wildfire0310 View Post
OK so after having Doppleganger come over and bouncing ideas around I think I finally figured out what the f**k is going on.

Oh yea welcome to once in a blue moon

So after playing with a few things Mike figured out the turbo seemed to me sucking in more air. Well so we tested the theory with his car and so be it. So we figured out that my car is starting to build pressure at idle. So this makes no sense cause I never seen a car start building pressure at idle ever. Well after playing with the car more, leaking the BOV, playing with the FPR we notice that if I remove air from entering the intake manifold or increase the fuel pressure the amount of suckage from the turbo decreased.

So after thinking things about, I have a theory that seems to make sense and only I would have this problem lol. Ok so I am running a stupid small turbo. Well the car is leaning out a idle(which I knew I was a little lean originally but not this bad) causing my EGTs to increase. This increase of EGT is causing the exhaust gases to increase their speed over the turbo. Those spooling the turbo more at idle then a normally. This is why my BOV was blowing air out instead of sucking like normal. Also explains why my vaccum is so messed up.

After talking to Ben91, we agreed that if anything(for a quick style fix) I should adjust my AFM to richen the car up. So the plan over the weekend is to pick up a narrow band gauge(since I can then reuse the gauge for when I finally get a WB) to test if the car is just stupid lean and then to adjust the AFM to richen the car up.

Thanks to everyone for all the ideas and to the people that talked about the car leaning out cause that made me think of how leaning a car will increase spool ever so much.
That's ridiculous! What size of turbo do you have?
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Old 03-27-2009, 01:54 AM   #25
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Why do people think they can turbo their cars without a damn wideband?
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Old 03-27-2009, 02:27 AM   #26
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Why do people think they can turbo their cars without a damn wideband?

Cause the **** government won't give me my money and I lost my second job right in the middle of building my 1.8 and my 1.6 started to die. So I did a low boost build until I can get WB and MS. Not the way I would like to do it, trust me.
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Old 03-27-2009, 02:29 AM   #27
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That's ridiculous! What size of turbo do you have?

Tiny... I have the spec on my build. It is as small or smaller then a DSM t-25. If I been told right, it is Savington's old T25
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