Cams/compression ratio.... beams 3SGE engines.

[RomanV]

When I dynoed my MR2, it was running fairly rich up top end, and leaning it out a little would definitely make some more power.

For my carina engine, I've bought a 'camcon' which is basically similar in function to an SAFC, but you can + or - the cam angle in 500rpm increments too. (I wont be worrying about any of this until I've got the engine up and running/trouble shooted/etc with standard ECU first....)

I figure that adjusting the cam angle wont be *hugely* useful with standard cams etc, the ECU should do a pretty good job of sorting that out already.
But I figure now that I've got a degree of control over it, perhaps it would be worthwhile getting a more aggressive cam profile, which is where being able to adjust it would be useful?

I'll be using the Altezza 6 speed box, which has fairly close ratios, I want my powerband to be from about ~5500-6000rpm onwards, I dont mind losing a little bottom end power to gain some up top.
(still stuck with standard 7400 rev cut though.... damn)

However I'm wondering, would it be worthwhile going for a different cam profile to standard, when running standard ~11:1 compression?
Or is a new cam profile only worthwhile once you've got more compression to go with it?

I've never been a fan of piggy back units TBH, seems like throwing a spanner into the works.
I'm willing to try this out, but going to a full stand alone will be the way to go if it doesnt work too well. My question about compression ratio still stands though!

[MikeMan]

Mild cam changes will be fine with 11:1.

Anything with big overlap will need a higher CR to make it work.

I would be looking at cams that work from 4600-4800 RPM onwards personaly.

[nz_climber]

Hey, will be keen to know how the piggy back goes, or if you have to go to the full aftermarket ecu.. keep us all informed. I am still planning on running the factory ecu on my upcoming project so keen to hear first hand about how things react to the piggy back