almtx3

iTrader: (1)

Thinking about picking up an OS 12TZ.

How big of a power difference is there between the 3 port and the 5 port? Is the 5 port that much faster?

Baedarlboo

iTrader: (11)

do you want to stay legal for racing or is that not a concern?

almtx3

iTrader: (1)

My local track usually has a few club races and they are pretty much outlaw so thats why Im considering the 5 port. Honestly, Im not going to be racing much within the ROAR or IFMAR Rules so I'm just curious on seeing what kind of power difference these engines make. Maybe in the future, Ill try to have both the 5port and the 3port so If I ever decide to race legally I can swap in the 3port, but thats wishful thinking for now.

bboy

For one, the 5 port is cheaper but you won't see the difference unless your track is reasonably "big" or has a long stretch of straight. I have both and I usually use the 3 for smaller/street tracks, and use my 5 for the larger and straighter tracks.

Be sure to spend time breaking in the engines. The OS take some effort but once done, they are great.

almtx3

iTrader: (1)

I think Im going with the 3port for now.

What pipe would you guys recommend to use with this engine?

tony montana

iTrader: (76)

or you could get the 3 port tz eb mods. I have one and its quick

MTX4JR

Here is where it gets tricky the best pipe for the os was o.s 1040 pipe and header combination but i hear that that o.s is not making that pipe any more. I have tried every thing from the rd logics pipes to the nova rossi 2630. The o.s like pipes that are designed like to the 1040 like the nova 2601. this pipe worked well on the os. If you concerned about cost the rd logics turbo pipe are good and very sturdy.

HarKonnenD

iTrader: (23)

I raced a TZ 5 port on the track and we were very close on the straights with me in the lean. Probably he had the wrong pipe on the car and could work on tuning to get more. Then again I have a Carlson TZ tuned .12 so no telling there. You won't need a 5 port to beat the rest anyway - just go with the best pipe you can get or get something slightly faster for the same price.

jameslow

iTrader: (1)

you can try Skyline VR12 plus pipe. I also once tried my friend RB pipe! Very nice sound, and output power! One thing i can notice when i put on the RB pipe is that u can feel ur engine is running very smooth!

RevMaxx

i had the 12tz-p5 and now its a 12tz-p3 after rebuild. i used the os 1040 pipe on both... have to say it a very good pipe for this engine, car felt responsive. fuel mileage with this pipe is quite good.

3port - normally has low-end torque and is on better fuel consumption between the 2. very good for small to medium size technical tracks.

5port - has the upper hand on top end and good for large tracks with long straights. sips fuel more though compared to its 3port brother

Paul D.

I think the O.S. Tz 5 port will be good for the new GPR kawahara conversion since the 5 port has more RPM's up on top.