RomanDave's Prius C swap

[xnamerxx]

You might want to crack the vvt gear open and put some limiting blocks inside it.

With my 272 cams the car really didn't make good use of the extra torque below 5k anyway since the close ratio transmission never allowed me to be there anyway.

[RomanDave]

Originally Posted by xnamerxx

You might want to crack the vvt gear open and put some limiting blocks inside it.

Ahhh yeah thats what I ended up doing.
I moved the cam another tooth forward, and added a stopper. This gave a good spread of cam angles that responded well at various rpm. Ends up with about 17 degrees of cam advance over the standard position with no vvti.

1 tooth back vvti sweep (2).jpg

If I moved the cam back to its normal position, I'd end up losing out on top end. So will keep it where it is. Happy with that!

I went to the drags and it was heaps of fun.
I was having some issues with heat soak causing big ignition timing pulls off the line. I've never done anything with the car so far that leaves it stationary for long periods, saturating with heat.
So I was getting falsely high IAT readings (up to 70 deg c) which meant it was pulling around 7 degrees timing out, when I only run 25 deg timing max by 8500rpm.

So I'll try get that a bit better sorted for next time, I'll try take some sort of ambient temp reading and then clamp the IAT signal to this.

Good fun though and I was happy with my trap speed considering it's still got a standard header and exhaust.

14.7 @ 94.4mph, earlier in the day I did a 95.5mph when it was cooler.


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