Car runs good but sputters a bit at >20psi. Turbo speed looks normal so I'm guessing I just need to tighten all the clamps and zip-tie every vacuum line. Battery voltage also looks a little bit low, not quite sure why. Finally, valve cover gasket seeps oil after boost. Its minimal but annoying - I have some 10.9 grade bolts coming in, so I'll just tighten it s'more
Well I fixed the fluttering issue. I forgot to tighten down the compressor housing v-band, woops
Now I have another issue. I think I'm lifting the head starting at 20psi or so. During a pull, past 4000rpm it makes a cracking sound , kind of like machine gun, and there is a smell of exhaust. I haven't looked further than that but I think I need to check head stud torque...
I did a run on just wastegate, for fun. Sorry for vertical video
And virtual dyno:
Blue line is with cracking noises, red is wastegate. Red corresponds to the video above. Obviously blue line should more (look at the torque)
Oil is perfect, coolant is perfect, there are no oil leaks. Plugs were all gapped between 0.032-0.035, i made them all 0.035. One plug wire wasn't fully seated on the spark plug so that was probably the most likely issue. AFR wasn't affected though like it would if it was not firing.. but who knows.
This is not a very good comparison, but unfortunately, all I got.
Same tune, same settings, same fuel. No boost control, just wastegate. Different ambient temperature (blue line was 10* hotter). There was, what I now determined, some spark blow out, which kind of throws this comparison out of the window.
But still every log I have shows flat top to be faster.
But this has me wondering: what do people do when they want to go higher boost?
We already know the limit for toyota cops is like 21psi on e85.
Apparently 25 or whatever you're maxed out at is the limit for gm coils?
Or do you think you're having a malfunction?