Turbo and general tuning options

[Ian@TunerUK]

I\'m still learning about the rotarys, what works and what doesn\'t as far as tuning goes.

Just interested to know about different turbo options, notice most people seem to go single turbo route with a great whacking unit! What difference would this make to say a pair of bigger turbos than standard as far as driveability etc goes

Also what sort of differences does the porting of the engine make? Is it similar to a conventional engine in that it just allows more air in/out of the engine or can it contribute to something else?

Compression, I\'m guessing the compression can be altered? Again what differences does this make and what can you actually do to alter this?

A few questions I know but I\'d appreciate any input people will have :Thumbsup!

[Red and Single]

A medium sized single will see you get upto 400rwhp with minimal lag.

That is what I went for and I love the driveability, with my T04S, I see full boost at 3500 rpm in the higher gears !!

[Bobfish]

Most people go the single turbo route because it simplifies the turbo control system. Getting larger twins often means custom fabricating a system which becomes expensive. You can go with something similar to uprated BNR\'s or similar though.

See this thread on uprated twins by a very knowledgeable american chap:

Porting you are correct on, it allows more air in and out. It will affect the compression the engine pulls, but not the compression ratio.

Compression ratio can be altered by either machining material off the rotors or using N/A rotors (these offer higher compression) however this is not normal practice in a turbo\'d rotary. People do build hybrid motors from N/A Rotors and turbo housings to run high-ish compression and low boost, but these are pretty experimental and not really worth doing IMO.

[Bobfish]

sorry forgot link. Here:

http://www.rx7club.com/showthread.php?t=450719&page=1