Originally Posted by serialk11r (Post 70753)

I think you can't mess with the piston shape with D4-S, they don't use stratified charge but the piston is shaped so the direct injector + port injector create a very even distribution of fuel in the cylinder. If you remove the piston shape, don't expect the performance to stay the same; uneven AFR will promote detonation and poor combustion.

Originally Posted by TexSIN (Post 76056)

Originally Posted by Mr.Jay (Post 76215)

i thought that was real for a sec....

Originally Posted by Allch Chcar (Post 76058)

Originally Posted by WingsofWar (Post 75954)

:bellyroll: :bellyroll: :bellyroll: :bellyroll:

You jelly brz/frs has cant tarbo

Originally Posted by Major Clod (Post 72650)

Another Brisbane Beams owner here - I have a Blacktop 3SGE in my '76 RA23 Celica. Great motor for a small car - glad the FT86 is similar in output, though I have to admit I'm ever so slightly disappointed it's specs are just under the Beams which was released 12 years ago.

On all the talk about extracting power out of these - High compression, small capacity, direct injection - sounds like its going to be an expensive / complicated little motor to mod and tune in the early days. Here's hoping there are few brave souls out there that get the ground work going on discovering any potential this motor may have.

Unless you're really willing to pay someone money to essentially do all the RnD for you - you're better off swapping for a proven Subaru turbo motor now (if laws allow) - or waiting until there has been some solid development done on this engine.

For reference, one of the most powerful modded N/A beams motors here in Australia makes approx 190kw at the wheels - stock is around 110-120kw atw.

This is with TRD headers, custom quad throttles, dual stage injection, motec, cams, pistons, rods, head work, etc... Built over years of trial and error with multiple motors and thousands upon thousands of dollars spent. Significant power can be extracted but it's NOT easy and its NOT cheap for these sorts of motors.

Originally Posted by arghx7 (Post 76609)

You didn't read much of the article that came out of did you?

The authors took a Ponticac Solstice engine, a 2.0 turbo direct injected engine, and heavily modified it into a single cylinder research engine. They took the turbo off and essentially blocked off three cylinders. They deleted the cams completely and ran with fully electronic valves.

They were investigating how much timing they can run with E85 on high compression pistons compared to running on 87 and 91 octane. Then they used the electronic valves to experiment with various unconventional valve timing strategies to reduce the effective compression ratio.

The whole point was to investigate the concept of a high compression E85 n/a engine that could be detuned for pump gas by using a Miller cycle. Look at the piston designs. They started with the 9.2:1 and made some prototype higher compression pistons. Notice that the higher compression ones have smaller and smaller piston bowls. That will cause all sorts of mixture formation issues on the D-4S system. Pistons on direct injection engines are a lot more complicated.