if you're refering to my conservative tune I had a standalone and was running lower timing numbers (like 12* at peak torque) with 0 knock being picked up by the knock sensors..bigaaron said:
stock cams what? when I took apart my 1jz I did have crower 264 cams(for about a month or 2).. My buddys car is on 2jz cams..Ric said:
yea I know, I never dyno tuned my car with its setup, or even dynoed on anything more then 9-10 psi... I'm sure the was more in it, not too much though (I'd say less then 50hp).. I assume I probably could of gotten ~ 14-16* of timing before I ran into detonation issues with not enough octane for 18 psi on the 67.. It still made great power though, It would easily out run my 2j twin car which put down 394..bigaaron said:
I'm not saying that 1jz will blow #5s cause they are weak. I'm simply saying that MAYBE #5 might be more prone to failure because of the reasons I said. Yes the engine failed due to user error, but #5 blew because I THINK that the smaller exhaust port and increased backpressure in that cylinder. #2 and 5 are more prone to detonation running on the edge vs cyls 1,3,4, and 6.Ric said:
Dyno tuning timing is Much easier though as you get a readout of how much torque the engine is making at x point on the map. You can add or subtract timing and see how it effects the same point. Makes it much easier to find the timing the engine likes rather then doing street pulls and pulling the plugs at peak torque and watching knock logs. But then again you might be over mbtt and not running into det issues and wasting timing increasing cyl temps and stress for nothing, so need a way to judge power output.. and the butt dyno isn't that accurate, haha.. 1/4 mile works, but again its not at x point, more of the whole rev range.The Reaper said:
I'm not saying its a major flaw. Its just the point which det might occur first then the rest of the cyls. Like on 4g63s I hear #3 is more prone to detonation for whatever reason, so you keep an eye on that one the knock sensor is places right at #3 (the number might be wrong, I dont remember, as I dont mess with them).. Its just a theroy of mine, and I wanted to see what other people thought about it.Ric said:
