So guys if he bought an 18g and run it at 340 bhp what kinda boost will it be running..? 1.0bar maybe
around 1.2bar?a guess though
1.4-1.5 bar on a small port just like the ihi. 1.8 bar to max the compresser flow out.
The amount of air you can fit into the cylinders is dictated by the capacity and the pressure at the valves. The only advantage a bigger turbo will give you is a slightly cooler charge, so 1-2% more air at best. It's a common fallacy banded around by idiots.
The power gains are in less exhaust backpressure on the pistons on the exhaust stroke
Bigger turbos make more power as they can move more air. The pressure at the intake is a function of volumetric flow and cylinder capacity, assuming volumetric efficiency is constant.
That choice can only be made by you and your budget. Owen Developments turbo to suit the 20VT engine is £1575.00, you'll need to make a new TIP and possibly (although not 100% as the manifold they used was warped them skimmed flat) need to trim the head castings a little.
You'll also require 550cc or 750cc injectors and you'll need to find someone to map it, not to mention anything over 340bhp will need valves and rods.
It all depends on how far you want to go.
You'll also require 550cc or 750cc injectors and you'll need to find someone to map it, not to mention anything over 340bhp will need valves and rods.
It all depends on how far you want to go.
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