^^You're better off with a properly tuned collector. Exhaust scavenging will give you power benefits over individual pipes. Also it doesn't hurt to chuck a turbo in there somewhere.

4 pipes... 4 turbos.... muhaha.
 
little ones lol.

My mate had dual oval tips, not bad but nothing beats four little quads for moi hehe.
I know straight thru mufflers are the way to go for minimum back pressure and max gas velocity but what do you guys like about a larger tri/reverse flow muffler design for a small output engine? According to autospeed it's recommended to avoid reverse flows, but on a small output engine like the gen 2 3SGE, Julian says you can get away with quiet OEM mufflers (and save $$) so long as they have big inlet and outlet diameters and are from high output cars like 160kw+

To get the most from a free-er flowing exhaust, you should really do a retune, which is not possible with the stock ecu AFAIK.
 
Cheers

artymr2

To get the most from a free-er flowing exhaust, you should really do a retune, which is not possible with the stock ecu AFAIK.

Cheers

 
Yeah....that is the problem (if you can call it that) with the stock ECU in an N/A as you are only are only virtually able to adjust the timing. These ECU's are very well designed by Toyota IMO to get the max out of a 2 litre engine. Once you start advancing the timing a little you tend to get pinging especially in the later model SW20's ('94 on) with the higher compression and 125kw ATF.
I installed a piggyback powerchip on my '97 N/A many years ago to try and coax a bit more power out of it and ended up getting rid of it coz all it did was confuse the computer and make the car ping on light throttle etc. These chips may work on some cars though especially turbos. 

exhaust fabrications finished except the tips, how do u upload vids here?

Just post it up on youtube and link it :)

wiz

artymr2

To get the most from a free-er flowing exhaust, you should really do a retune, which is not possible with the stock ecu AFAIK.

Cheers

Yeah....that is the problem (if you can call it that) with the stock ECU in an N/A as you are only are only virtually able to adjust the timing. These ECU's are very well designed by Toyota IMO to get the max out of a 2 litre engine. Once you start advancing the timing a little you tend to get pinging especially in the later model SW20's ('94 on) with the higher compression and 125kw ATF.
I installed a piggyback powerchip on my '97 N/A many years ago to try and coax a bit more power out of it and ended up getting rid of it coz all it did was confuse the computer and make the car ping on light throttle etc. These chips may work on some cars though especially turbos. 

 
Sorry to go a bit off topic but it is interesting that you had pinging. My car on the standard ecu didnt ping at 11.3:1 compression, that's a full one point increase in compression over the later generation sw20's. 

Engines 'ping' because people often feed them cheap petrol...

Hmm that is interesting cos they say production cars are made to run rich...also shouldn't the ECU retard the ignition timing automatically when it starts to knock? I read somewhere (Toyota source) the ECU runs as lean as possible until it knocks then retards until no more knock.
Also instead of a retune, can't you just reset the ECU if it's small changes to the air fuel ratio? ie for intake/exhaust mods?