Overboost protection

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SH4DY
MS/Extra Newbie
Posts: 28
Joined: Mon Jan 05, 2015 6:12 pm

Overboost protection

Post by SH4DY »

After sorting out some hardware issues the car is finally running like I feel it should. The issue I have now is that it's breaking up under higher boost levels. Almost feels/sounds like a rev limiter.
7 psi (wastegate springs) pulls clean until I lift but once it hits ~12psi it starts cutting out. I haven't tried lower boost DC percentages yet to see what happens at say, 10 psi. Overboost is set to 200 kpa so I shouldn't be near that.
Pertinents:
Turbo LS1, TH400, Belt drive fuel pump (hence the high cranking PW), running on VP110, LS2 coils
Running TR6 plugs gapped to .025"
'77 Datsun 280Z twin turbo LS, MS3Pro equipped
745rwhp @ 7 psi
nathaninwa
Super MS/Extra'er
Posts: 2637
Joined: Tue Sep 14, 2004 4:17 pm
Location: Aberdeen, Wa

Re: Overboost protection

Post by nathaninwa »

Nothing looks odd or out of place at a quick glance. No status codes. Have you verified timing with a light? I also noticed timing is really low even running 110 race fuel. I'd also switch to a br7ef gapped about the same. Could also try a little more dwell at 3.5ms
Volvo 940, 2jzge, MS3Pro, daily
240Z, 2JZ, MS3Pro boost control
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