850 cc secondaries on turbo 2?
 

I have a 1st gen with an 87-88 turbo 2 conversion, stock turbo, upgraded front mount cooler, cartech fuel pressure reg, custom 3 inch turbo back exhause with no cats boosting 13-13.5 lbs. 2 months ago, I put 270.8 hp to the rear wheels along with 243 lbs-ft of torque. Anyways, next year Im going bigger turbo with slightly lower boost in hopes of making around 320 rwhp. My question is if I don't want to run 2 additional 550 injectors with and aic (like the sds one), what would I need to replace the factory 550 secondaries with 850 cc injectors ( I think they came on the 12a turbo. I need to go stand alone, don't I? Which is easier to setup/price difference? Thanx.

how did u manage to get 270 rwhp with a stock turbo s4 engine?!?!??!?!??!!??!?!?!?!?!?!?!?!
dont u mean flywheel?

Do I mean flywheel? No. flywheel would be about 320 hp. Do you want to see the dyno chart dude?

850's
 

Aren't the 850's side-feeds. The 2nd gen secondary rail is a top-feeder rail.

And, "yes" you should strongly consider going with a standalone computer - Haltech, of course. It's the way to go. Not because its the best, or the cheapest, or has the most features, but because there is adequate support for that computer on a rotary setup... cha-ching! Subscribe to haltechsupport on yahoo's groups and read all the posts. With the stock ECU, you are going to have to use an FCD to get past fuel-cut. Even if you add more fuel (AIC), the timing will be off for higher boost levels.

Steve C.

holy crap! nice amount of horsies there d00d!

(even tho aussie dynos read lower and all)
thats still good!
and on stock ECU and injectors and fuel pump?

T2> On a dyno dynamics it would make maybe 240-260 if he was lucky. Thats about normal.

The 850cc injectors from a Cosmo or FD are side feed. The injectors you want to run are the 'green' top ones that are 800cc and come from factory 12A turbo engines. They are top feed and bolt straight into a 2nd gens fuel rail.

AJC13B, where can I source these injectors and what about the stock ecu? it's no good anymore, right? T2, the fuel pump I'm using isn't stock, It's some Bosch electric one (very noisy) don't know the gph.