What are your clucth settings right now as well as your gearing. The Sirios love higher gearing than other engines.

Correct

A 3 port sti has loads of power!
The STI 3 port will have more power than your Evo 2 ever had
Why do you need a % port STI
Have you got heaps of traction where you race?

thanks for sharing....just wanna to know the different between
a 3 and 5.
anyway, just got my 3port STI after mths of saving
TQ/ champion ......... here i come !!

Dont forget to buy plenty of tyres as the STI will chew them up and spit em out
As for sharing,
Any time bud

Any info guys?

These settings are base settings for all sirio non sti 21 engines low end needle 5 and 1/2 turns from closed main or high speed needle 6 and 1/2 turns from closed and mid range is flush and then 1/2 a turn out. All these settings will get the engine running they are not factory settings more of a general starting setting if your carby gets all out of wack they should be a ritch carby setting as well. If not ritchen the main needle antill you get a ritch carby setting and then begin to retune your engine rembering that your engine will not hold a consistant tune antill it is at normal running temp around 90 to 120 dec C at those running temps your engine can be tuned corectly and it will hold a tune better as well. Hope that gives you some ware to start from. Also with the Sirio pr pro or pr pro evo2 and sti evo2 engines always use a number 7 turbo sirio glow plug with 25% nitro if you run higher nitro or in a very hot climet say air temps above 40 deg c you may need to go to a sirio 8t plug. Alway use a sirio or now a Rb zenon or matrix exhaust system for max paformance on and off road. Most improtant of all you must use a quality fuel that is vital to long engine life regardless of brand. Best Regards Jeremy.

At the moment i m using 17/22t pinion and 59/56t spur. my setting right now is 1.0mm spring adjuster from the tip of the thread and shimming my inner bearing just enough to give it a gap for free rolling clutch bell and my end play gap when measuring using Kyosho pinion gear removal tool from the front is 0.4mm. I m also using the stock gray clutch shoe and s6 plug with 16% odonnel fuel and Sirio efra 2611 pipe. Somehow the engine just doesnt have enough low end torque however from mid to high end it is ballistic.

one more thing, will it make any difference if i use the red clutch shoe?

don't use the red clutch shoe it will make you have to constantly keep adjusting the clutch bell gap as it is a sliping shoe and wares very quickly. stick with the gray shoe kyosho part #fmw 10 it may be a difrent number for the 3r evo clutch. What are you looking for? a punchy clutch feel or better axcelaration? If you want a puncher clutch feel take a 0.1mm shim off the thrust bearing side or "endplay" and put it to your shoe to clutch bell "gap" that way your not changing anthing just moving the clutch bell 0.1mm out from the shoe in outher words. Leave the 1mm spring tention and change the Gap to 0.5mm and the endplay leve the same 0.1mm. The outher option is to drop the first gear to 1 lower ratio than what you have now just one tooth on the spur may give the feel your looking for. You can also try to put more spring tention into the clutch but make shore its not slipping to much. Are you making good run time with your engine compared to outhers were you race? it may not be a clutch prob at all. I would do a litle testing and comparing with people who run the same chassis and the same or difrent engine and clutch settings. Regards Jeremy.

Try tightening the nut (spring adjuster) down to at least 1.2mm and give it 0.5mm of gap. If the spring is old, get a new one. It makes a big difference.

Thanks Sirio2127 and Jag, will try it again later today.

Adjust the spring nut to 1.3mm. That should help but if it is slipping too much, go back to 1.0mm and change first gear to 16/58.

And it's no wonder !

Dude, 17/59 is the tallest gearing you can run for first gear, try 17/61 and then let us know !

If your spring has been used for a wile i would also recamend getting a new one It dose make a very big difrence. I would only get the Kyosho 4d spring don't get the kyosho hard spring the "4d clutch spring is much better". I also think you should try the settings above they may be to agressive for you but i sugest you try them and see how it feels to you. I would also recamend ritching the bottom end. As i know when i came from off road into onroad i thought i had my clutches worked out. But it took a very good friend and very exprenced on-road racer to give me the advice i needed. At the time i was useing a sirio21 wcr engine and the clutch was coming in way to early and boging the engine down and robbing power from it. After i did the changes he told me to do I found that i had leaned the engine to force it to make power because the clutch took so much away. After i ritchend the engine with the new clutch settings the engine came to life instantly i felt ezy a 20% paformance boost and don't get me wrong the engine was very very fast befor. Clutch is one of the most important settings to get max paformance from any engine rember that. Best Regards jeremy.