[Synack]

Originally Posted by Manji

I'll also add that one thing I have noticed about forums is there seems to be this obsession with "High comp low boost for the win"

Probably because one person said it once, and the rest are just jumping on the bandwagon.

In the real world, with real world limitations like pump fuel, you'll find the opposite is true.

I'm not saying that high comp is bad. I'm saying too many people are looking at their turbo builds through NA-knowledge-tinted sunglasses.

Lets take a practical example. Using this motor and a gtx2867r (yes I love this turbo)
On 7psi making 300whp at 12.5:1, that pretty much all your going to get. Knock limited. Which in part is caused by the turbo operating at this level inefficeintly, but mostly because of the static comp. (This is why a bigger turbo at this level achieves marginally more power, as it's landing in a better efficency zone at that point.
But if you run the same motor at LOWER static comp, meaning the gtx28 has to BOOST harder (that doesn't mean is working harder, work should be judged by effiency zones) it will make 400whp at 14psi and end up at the same efficency zone. (So IMO similar work load on the turbo) You also wont be governed by knock as you could spike the mid range up higher if you wanted to.

A 2 litre motor, running a gtx28 frame turbo at 400whp, at 9.0:1 static comp will NOT have poor throttle response.

Fantastic, thanks man.

Originally Posted by Manji

Because you're no longer near the knock threshold, you can get more aggressive with the tune, which is where a lot of throttle response really comes from.

You can't get that aggressive on pump fuel & 300whp & 12.5:1 c/r.

I'll have to ask my tuner to get more aggressive because I'm at 350whp at 20psi right now on my Precision 5431.