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Issue when coming into boost

 
Old 06-26-2018, 04:01 PM
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Default Issue when coming into boost

hey guys,

first real post other than my meet and greet, and I already have an issue with my car.

My car is a 90, with a mspnp2, rx8 injectors, ls coils, colder plugs gapped at .030, stage 3 clutch and lightweight flywheel. Car ran fine for a while, but had a faulty temp sensor (the green guy on the back of engine) and when I replaced that I also swapped to a bmw tps.

After getting it back on the road, I have a strange issue where I can drive normally under 3k rpm, but when I get above that, I can hear the boost building normally, for a second, once it gets about 2 psi though it makes a much louder hissing/scratching noise, and it goes no where. Boost still builds (very quickly compared to how it did prior to changes) and will peak at 10psi, but the car goes no where. Rpms DO NOT INCREASE past 5k. This happens in every gear.

what Iíve been thinking: this is a street tune, done by me. I donít have a whole heck of a lot of knowledge on tuning, but I use VEAL. AFRs are 9.6-10.1, which is ridiculously rich, and I notice my spark map is more conservative than most Iíve seen, (18.- at around 120kpa) could these together cause this?

second thought: clutch badly slipping/installed incorrectly. I donít think this is it, because rpms do not increase, and I do not feel any jerking like the clutch is slipping then catching.

sorry for the long winded post, any help would be appreciated

Attached is a pic
took of the area it was the worst on my data log, not at home right now but will post data log from a ride around my neighborhood if people think that would help when I have the chance
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Old 06-26-2018, 04:03 PM
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Also take note, in the log you can see tach signal jumping up and down while rpm slowly increase, I didnít feel it in the car
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Old 06-26-2018, 05:10 PM
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post a log pulled from when it happens.
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Old 06-26-2018, 05:19 PM
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9.5 AFR in light boost. motor is flooding.
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Old 06-26-2018, 05:51 PM
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I will tonight when Iím out of work, and Brain thatís what I was thinking, because as soon as boost comes in itís pegged to around 10 afr. But the loud hissing/scraping is whatís confusing me, when it happens Iím not backfiring or anything, so I wasnít sure if thatís the only culprit at work here
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Old 06-26-2018, 05:59 PM
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usually that rich makes a farty noise.

take vid so we can hear.
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Old 06-27-2018, 10:11 PM
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Hereís partial and full throttle videos, the partial all sounds normal, full throttle video you can hear the loud noise a little better, but in testing today, I found more issues, my internal wg opens around 8 psi, but in the video you can see it creeps up to 12ish, max creep I saw was 16 psi so I have that issue to correct. Pulled some fuel out and still running rich, will post data log ASAP. Ignore messy interior, car is still in its infant stages



the sound is vey hard to hear via video
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Old 06-28-2018, 04:38 PM
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Omfg shoot me, Iím a fóóó idiot. My wastegate is opening way sooner than it did in my prior set up, around 3500 rpm, which is the cause of the strange noise. The strange noise is just my wastegate opening sooner than expected. Then the car falls on itís face because boost is slowing creeping up beyond that point and not building like it did prior to 3500 rpm. Brb gunna go hang myself before you guys castrate me
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