Lazy-Rx7

all i have is a hks intake and open atmospere modded stock blow off valve. *note this happened before and after the bov mod. i'm pretty sure i do have vacuum leaks if this could cause the problem, but i'm afraid it might be detonation.

under hard acceleration when boost is building for example, in 2nd, full-throttle going through 3500 on up when building boost there's a weird sound that comes out of the engine bay. it sounds like two metal things hitting each other, sounds sort of like a small stone in a washing machine, sort of pulsating and around 6k it sort of disappears or its just drowned out by the engine. let me know what you guys think.

this is a 1987 tII

dr0x

Sounds like your engine is pinging or detonating. Have you tried using a higher octane?

Lazy-Rx7

i'm using the highest available, which is 93. are there any other symptoms.

dr0x

How much boost are you seeing?

Lazy-Rx7

on full bost i would say around 1/4-1/2 way between the 0 and 40(max) on the stock boost guage in 40 degree weather.

dr0x

Hrm.. wierd. There is no way you should be detonating w/ 93 or hitting fuel cut (you are only boosting like 5psi). There has to be a fucked up bearing or something.

Lazy-Rx7

well... i said the same thing to myself. then i got to thinking whats the most likely problem that i didn't check. and i found it, the previous owner switched the leading 2 with the trailing 1 which was causing the problem.

thanks for your time.

-steven

Ryde _Or_Die

Ok so the only thing done to the car at all is an intake and your modded stock bov? No FCD or exhaust work?