Noobish Boost issue
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Alright writing this for the second time due to the computer restarting after window updates:vash: Well I have been tuning and tweaking on this mspnp for about a month now and feel I have gotten the hang of it. I would like to thank a handful of people on this site for that. I feel I finally have gotten to the point where I can get on it a bit more and see what my old girl can do, but there seems to be an issue with boost. When I ease into the throttle boost builds slowly but surely but if I step on it boost builds for a moment then falls on its face. I thought maybe the boost protection cut out but that is set at 200 so that can't be the issue. I have done some searching on here and other sites looking for a possible reason why this happens but still haven't found a answer yet. So I figured I would make a thread and ask for advice from the experts out there to see if they could point me and my car it the right direction for maximum boost. I also am including a current setup on my mspnp as well a most recent data log which looks like I have a recently lose ground somewhere. The reason I say that is the last data log doesn't have any noise in it. For those of you who are looking at this a little help would be great. Thanks Tony
About the setup: 91 miata stock mtr t28 churbo with 14lbs waste gate afm delete w gm sensor intercooled vtps diy dual feed rail 460cc injectors lc-1 wideband |
how much boost are you making before the cut? (I cant view log here)
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10.5psi when easing into it and maybe 5 when punching prior to the fall out. Can't seem to find the fall out on the data log to give you the exact number.
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take a log of it and hit space bar when it happens. a short clean log of just that event.
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Will do when i get home tonight. Quick question, under full boost what should the fuel pressure be at?
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~50 + whatever boost you're making.
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Hmm on the data log at 10.5 psi I get 13 on the fuel press chart.
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and 30+/- at normal driving
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MSPNP doesnt log fuel pressure.
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Never mind just read about the computer doesn't have a input for fuel press so that reading is invalid. Will post log tonight
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jynx! lol Thanks anyway will get back to ya later.
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Alright this was the best I could do to show the problem but any help with the problem or something you may see that isn't looking correct give me a heads up. I'm still learning. Thanks Tony
If these pics don't work then give me a heads up and I'll find something that does. |
failed attempt at better pics:crx:
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Better pic. Any help would be greatly appreciated. Thanks Tony
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dont see anyhting in that log, you let go of throttle and boost drops off.
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hmm. something doesn't feel right but I will have to get a better shot of that. Anything else you might see that doesn't look correct or problematic.
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was that first gear?
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I'm pretty sure it was 4th. why?
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the rpm increase looks rediculous. is your clutch slipping?
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Well that could be completely possible since it is the stock clutch. Good thing I have a spare on standby. But shouldn't rpm follow the boost curve?
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