http://www.rx7club.com/build-threads...932044/page29/
what engine detonation looks and sounds like @!
"My tuner said he could feel it let go up top at the very end of the pull.
I have been racking my brain trying to think of what could have caused it. Once the engine is apart, we will know more. I just want to make sure it wasn't something in the setup. I don't think it was, as AFR's and EGT's were solid.... but I want to absolutely make sure. My hopes are that it was an engine build issue.
540whp is a lot of hooche. I'm still using the OEM lower manifold. I considered it being an issue, but my EGT's were within 10 degrees of each other under full boost. The same could be said for my injectors and pump. If I was running out of fuel, the AFR's would have jumped. They were solid, and even dipped into the 10's one run.
Same for my WI system. I'm going to test it, but if I would have drastically lost meth, my AFR's would have leaned out.
We don't want history repeating itself with my new wicked engine! "