MR2 Roadster Owners Club

The Workshop => Maintenance, Problems & Troubleshooting => Topic started by: Pete McCue on December 14, 2024, 14:37

Title: V V T
Post by: Pete McCue on December 14, 2024, 14:37
Afternoon all, quick question if I may.
Can you feel the VVT cut in? I certainly don't feel any change when accelerating.
Also, although my car runs perfectly smoothly with decent ooomph, I don't feel there's much point in taking it much past about 5500 - 5750rpm. It will rev out, no problem, but there's no real urgency at that point, is that normal?
My Z3 had variable valve timing but the Vanos system is a constantly varying system so you don't feel any point where the performance changes, is the Toyota system the same?
Cheers.
Title: Re: V V T
Post by: Craigjm on December 14, 2024, 14:53
You won't feel it because it's continuous throughout the rev range it doesn't "kick in" like Honda vtec does at certain rev points
Title: Re: V V T
Post by: Ardent on December 14, 2024, 16:29
@Pete McCue

I have a document somewhere that illustrates what is going on when. Just need to find it. Helped me visualise things.

If anything you might feel a little bump around 4800, but no dig in the kidneys.
Title: Re: V V T
Post by: Ardent on December 14, 2024, 16:39
@Pete McCue

Found it. The 4800 ref might be my own perception.

If you would like to read the rest of the document let me know.

Screenshot_20241214_163556_OneDrive.jpg
Title: Re: V V T
Post by: shnazzle on December 14, 2024, 23:30
It's quite interesting watching the VVT graph on ELMScan/TechStream. Then you get a view of how much it's constantly changing the angle
Title: Re: V V T
Post by: Pete McCue on December 15, 2024, 07:55
Excellent, thanks for the info. Clever stuff isn't it.
Title: Re: V V T
Post by: Ardent on December 15, 2024, 08:51
Very.

In for a penny. The full doc here.

https://1drv.ms/b/s!AjKQRUlKMbdSjGDq6vyBEURtgVpA

And

https://1drv.ms/b/s!AjKQRUlKMbdSjGHzDmgZgPzfwXOg