Mongo

Can anyone (mappers) help me with on details on CR (I realise this will depend on turbo selection). I'd like to keep lag down to a minimum (as everyone else!).

Some people have used near to N/A CR in conjunction with a large turbo. I reallise that the engine drawing air through the compressor side will have a laggy affect, however this will be counteracted by the size of it flowing air more freely. Has this method been used on the subaru engines???

Also has anyone delved into the under crown piston cooling aspect. From the sounds of things it's not an issue. But at what sort of power levels will it? Just theoretical and wanting to learn about the engine

SSCJAY

Sorry can't help with your CR question but FYI

The EJ22t Has Piston squirters, Guys in america running these engines near to 1000 bhp mark.

Mongo

Cheers mate. Thought it might be somewhere out of my bank balance lol.

Just wanted to check that the cut off point was hundreds of bhp away and not just a few.

Jolly Green Monster

iTrader: (4)

higher compression ratio does indeed help spool and low rpm off boost driving etc.. but at high boost levels it makes the engine more prone to det..

the definition of high compression and high boost are obviously critical, and really a question for an engine builder to answer or the person speccing / supplying the parts.. from a mapping point of view you end up mapping to what you are given. However tend to find that often an owner won't know the compression ratio even if they built the engine themselves so difficult to establish which compression works best having mapped many car with built engines in them.
Speccing an engine build and turbo and intended use and output and mapping it is a different kettle of fish of course.

What is the expected use of the car and turbo etc?

Simon

Mongo

The intended use of the car is visits to the 'ring, trackday's, touring holidays and fast road use. Not for commuting and the such like..

From previous threads the MD321H/T turbos have been recomended for 400/450 and good spool up time. Did have a look at owen developments site at the two direct fit internal gated ones they do 425/475. IIRC they're ball bearing turbos too.

Looking for tractability, low lag, and quick spool up times.

I appreciate that I ought to speak directly to Owen's or RCMS (it is RCMS that do the MD321H/T turbos?)

Mongo

PS thank you for the reply

Mark

500

It's Lateral Performance that 'do' the 321, but you can get it from most scooby specialists

Mongo

Is mark ever going to sort out his website???

Scott.T@PolarPerformance

maybe not, but he does answer his emails