A
Wow, that’s a massive difference!
So for clarity, what torsion value should us ATL owners be aiming for?
Hi,
That depends on what your preference is and what you are looking for. This is only my own experience with my specific ATL.
So it could be slightly different in your case. Is it economy? I had best results with retarded TV of approx. +2.2⁰ - +5.5⁰. On a flat highway cruising steady 60mph gave 76mpg. But downside , Good torque downlow but sluggish above 3000rpm.
Is it performance? I had best results with adavanced TV of approx. -2⁰ to -3,5⁰ . Slightly less torque downlow, but easy revving beyond 3000rpm. So good power up de revs. Downside was that the torque was bit peaky, or nervous for my taste and peak torque shifted up the range 200-300rpm. The consumption was siginificant higher.
I finally ended up range at TV of 0,0⁰ with a small retarding to +0,6⁰ . This gave good drivability (torque) and decent consumption at speed. This is where I am, most of the time.
Interesting to mention is that idle compensation (MMB 13) gave the smallest differences among the cylinders. My idle consumption is 0.6L/H. Overall consumption is 67mpg.
This is with the original GRJ gearbox, so a bit higher ratio than the MPY 6-speed.
As you know through time the timingbelt stretches a bit, so it would not harm to check your TV halfway the change interval of the belt. Also under load the timing retards approx. 0,5⁰ TV. So under load I have 1,0⁰ retardation of the timing for good torque.
If you like to persue this experiment, I'd suggest you do so. I'd recommend it highly.