|
OK my roommate and I took it for a spin. At first I just revved up to different RPMs while just sitting there, to see the change...all the while sitting still AFRs never left the 10s, mid to high 10s usually. Here are our findings...
940 RPMs - 2 knock
2200 RPMs - 73 knock
3000 RPMs - 101 knock
4000 RPMs - 80 knock
Then while driving, we found pretty much the same results. I can't say its 100% consistent because at some points it may drop from 100 to 40 but it goes right back up. Since putting the new turbo, equal length manifold and CJM fuel rails on last week, I still have just about the same AFRs. At idle they're the same, around 10. Once I start moving from a stop, they will go up to around 12, sometimes getting up to 13 or 14 under light throttle and just a very little area, then it will go back down to 12, then 11, then 10, and will vary between 10 and 12. When it hits 14, I'll either give it just a little more gas or let off just a little and the AFRs will drop instantly.
The thing I need to make clear is these knock readings have been this way ever since I built this engine and put it in...with stock twins, then the first single turbo and now this one. However, I did put in the PFC, Noltec mounts and GReddy Ti exhaust when I did the engine, and since I didn't have the PFC before that it's impossible to know what it was on the old engine with stock mounts and exhaust.
|