Race Engine Forum UK

Thanks Guy,

The engine output is calculated by dyno with 20% transmission loss. In USA they put it to all automatic greaboxes as rule of thumb.

It was dynapack dyno, much more accurate than last one. The graph is measured but for 100% accurate numbers the automatic transmission turbine correction should be used somehow. In end rev's the engine and dyno calculated rpm (hub rpm/rear end ratio/transmission ratio [Hub/4.3/1]) were ~500 rpm different.

I would like to get max torque in higher rev range, maybe I should change back to Volumex exhaust cam?

Maybe a bigger turbine A/R might do that?

G

Turbo is Holset hx40 super. Turbine A/R should be big enough; the size is 16cm2. There is different information in internet, but compared to Garret it should be 1.08 to 1.21 A/R.

You have ( I think) a pair of 2 liter atmo cams at 110 deg, I'd experiment with the cam timing first, give it a bit more overlap.

G