Who here owns a Subaru?

With an Apexi Power FC standalone ECU you can, but they aren't cheap.

I only have a piggyback ECU which allows me to change fuelling and ignition timing and set launch control etc, but I can't lower the 'cam switch' sadly.
 
Acme said:
With an Apexi Power FC standalone ECU you can, but they aren't cheap.

I only have a piggyback ECU which allows me to change fuelling and ignition timing and set launch control etc, but I can't lower the 'cam switch' sadly.
Click to expand...
ok. i think it would want the cam coming on at 4.5K rpm. 6k makes the power band very small. i think 4.5-8k would be better for 7/10 road driving.
 
Depends how low you set it. I think in some Lotus applications the changeover is at 5600RPM, rather than the standard 6200. They wouldn't have done that if there was no benefit.

I'm sure setting it at say, 4000RPM, would be pointless though, as you say!

Having it set to 5600 also makes it easy to keep it on cam when changing from 1st to 2nd. With it set to the stock 6200 the only way you can do that is if you rev it right to the limiter and quick-shift.

Would be nice if it would stay on cam without having to think about getting the gearshift right.
 
Last edited:
Acme said:
Thats not really true. I think in some Lotus applications the changeover is at 5600RPM, rather than the standard 6200. They wouldn't have done that if there was no benefit.

TBH I'd be happy with it at 6000 or even 6100, because it would make it easy to stay on cam when changing from 1st to 2nd, at 6200 it requires some practice to get it right every time.

I'm sure setting it at say, 4000RPM, would be pointless though, as you say!
Click to expand...

There's a whole host of ressons Lotus lowered I'd (I'd imagine due to drivability) or as you mentioned to make it easier to keep on cam

I cant remember where I found the dyno graphs now, but I did find a dyno comparison somewhere in the past where cross over was effectively disabled vs set to 3000rpm and somewhere around 6000-6300rpm was optimal (Much like VICS on the NB MX5 engines, factory 5200rpm is optimal give or take 200rpm at best)
 
Ah I have started over-editing posts again. :( :p

With a Power FC tune and the cam change lowered to 5600, the revs do pick up faster from 5600 to 6200 than they would if it weren't on cam, so it will have some benefit to in-gear acceleration. Probably not a great deal though.
 
You must log in or register to reply here.
Back
Top Bottom