Hi to all. Merry Christmas
It's year 1997, 940 B230FK, auto transmission
Targeting mild uprade around 200bhp and 280-300nm
Will the all standard 13C, injectors and fuel pump, exhaust... by using Rica fuel and ignition chips ...will this can get 200bhp?
Hard to find 15G turbo. Could the 13C be hybrid using billet fins 16T ? I think can't go over 16T with auto transmission...bigger like 19T maybe causing lag
The absolute easiest thing you can do is stick a manual boost controller on it and turn up the boost to ~12 psi. If you go much above this, you'll probably hit fuel cut on a stock ecu without chips. It does vary though, I saw 15psi before hitting fuel cut. You'll want a boost gauge as well to monitor what boost you're running.
The 15G isn't really that good an upgrade. The compressor is only slightly bigger than the 13c. The only real reason to use it is if you want a turbo to use a conical flange turbine housing that fits the stock downpipe, which is the most restrictive part of the stock setup.
You'll see the most improvement here if you get a 16T or bigger, with a straight or angled flange hotside, and put a bigger exhaust on from turbo back to suit.
Stock injectors and fuel pump are actually fine for ~200 hp at the flywheel. They provide enough fuel to run AFRs of about 10-11 at 15psi on a 15G (with V cam and custom chips).
I put it on the dyno when I had it on lower boost (9psi) prior to having chips made, it showed AFRs of mid 9s at the top of the rev range, and made 155 hp at the wheels, estimated 195bhp at the flywheel. At 15psi I'd expect that to be up to about 180 at the wheels so easily above 200 at the flywheel.
Also if you put bigger injectors on without changing the map via chips (or another method), then it will just run rich and you'll lose power and fuel economy. It's rarely worth changing injectors unless you're running out of fuel, or you want a better spray pattern for the same flow rate.
With a slightly smaller turbo and stock cam, you'll see a slight reduction from those numbers I saw, but probably not that much. If you want to see 200 hp at the flywheel, a decent intercooler and less restrictive exhaust will help a lot more than just throwing a bigger turbo on with no other changes. I'd say worth getting an MBC and boost gauge first, then IC and exhaust, as you'll see more of an improvement. You could probably get a 16T on there at the same time as doing the exhaust if you want to see a bigger improvement all at once and save effort on the exhaust.