skyline pipe should not be a bad choice... i have try it on sirio evo 2 and is running gd.. so i think sti4 should not be a problem too!!! hehe!:lol:

skyline wont be a 'problem' for any engines in fact but i want to know how far/bad is it compared with 2611 as 2611 is deemed the best pipe for sirio.

also will 5 or 6 fins manifold be more suitable for the sti4 (if using skyline)? :weird:

I had tried the Skyline with the Evo 3 Sti before and the power was significantly lesser as compared to the 2611. Have not tried with Evo 4 before but my guess is that it will be with around the same results......
Sirio Engine requires a longer pipe as it is very good on high end revs but a bit flat on the bottom punch so the 2611 compensates for this :)
Hope this helps

By the way does anyone know where can I purchase a Sirio XXX Conrod? :confused:

Werks Team Line B7
 

anyone know what the factory setting are for a Werks Racing Team Line B7 Pro .21?

Thanks

What would cause the Sirio EVO 4 to continually stall at the end of the staight, with temps at 240?

the moment when you let off the gas or still at full throttle?

if it's when you're still at full throttle; you're too lean, gotta rich it.
if it's when you've let off the gas, you can try to bump up the idle abit. ;)
(also check the radio epa on the brake/throttle)

would anyone agree with me that sirio engine need to be run a liitle bit high on temperature then nova base engine?:nod:...any comment?...;)

i am pretty sure that its the oposite:smile:

No
 

Here in Florida ,they need to run alittle on the rich side:nod:

Kemp,

Your idle needle is probably set to low. With my Sirio it idles great when cool but once the temp gets up a bit over 225 the idle will drop down a bit and sometimes the engine will die out so now I run with a bit of a higher idle when cold and once it gets up to temp its fine. Also, what plug are you running? With the cooler temps we've been having a 6 or 7 plug is a bit to cool and the engine may have trouble staying lit at idle. You can drop a shim or go to a hotter plug. I went to a #5 plug and haven't had a problem.

Regards,
Daniel
AKA:Speyederjedi

Yep, I'd have to agree, here Sa Antonio, Texas a few of us are running the Evo 4 Sti and it's a bit like some of the Piccos I've had.... Likes to be fat on the bottom end:nod:.

Regards,
Speyederjedi

Sirio .12 items for sale
 

I have a couple of spare parts for sale pm me with your needs
sirio spring nut deal pending
sirio clutch spring deal pending
sirio carb restictor 5.5
sirio thrust beering guide deal pending
4-blue clutch shoes deal pending
2-red deal pending
2 yellow deal pending
sirio carb return spring
2-siiro exhuast ring
2-sirio power clutch weights deal pending
1-sirio power clutch disk deal pending
1-sirio .12 head shims
2-sirio evo4 conrods
1-sirio evo4 piston pin

sirio using picco pipes?
 

anyone tried using their sti with picco pipes like 2607? :D

i was wondering what the new xxx is like? is it good on wear and tear,performance,tuning etc. cheers

I would be interested in how you guys would compare the XXX to the EVO 4 STI?

The reason I am asking is , that the EVO4 STI has a coated crankshaft which the XXX doesn't have. So if the performance is similar, I would personally rather stick with the EVO4.

I hate it when I have a great running engine and the crankpin is wearing down.

You can alway send the crankshaft to a company specialized in DLC coatings....

First of all, having a crankshaft coated is very critical. We have once sent 5 cranks for coating for €25 each. on 3 of those cranks the crank pin broke of within the first liter.

Secondly, if the performance of the EVO4 is just marginally lower than the XXX, why would I buy an engine that is €50 more expensive and then spend an additional € 20-30 to have the crank coated.

In this case, the XXX would have to be much much better than the EVO.
That's the reason I asked the question about comparison of EVO 4 STI and XXX

stefan what do you believe cause this break?
maybe they heat them very much to make the coat?

the surface treatment is changing the crystalline (molecular) structure of metal.

It seems that the treatment, if not done correctly, is weakening areas that have been hardened during the production of the crank, i.e. the crank pin.

Just my theory though..

The coating will make the pin a few microns thicker, you have to take away some microns from the pin or otherwise drill up the conrod. We keep it by a hard metal pin pressed in the crank, no wear at all.

Roelof, no offence, but I have done this plenty of times. In the States I had found a galvanic shop that was able to hard chrome only the crank pin and this worked perfect.
It is absolutely clear that the pin has to be lapped after coating.

The problem is, that most coatings won't work.

I would like to get back to my original question, please!

i was wondering if anyone could anwser my question about the xxx motor.cheers.

I think Sirio is comming out with a new xxx in a few months.

XXX STI ?

lookin 4
 

Hey guys lookin for WCR s21 short stroke parts P/S let me know.Thanks Bobby Watson

what glow plugs work in the 21 other than siro

Picco
 

Picco or IDM work perfect:nod:

standard plug, I thought the turbo's were

IDM plug = Sirio plug :nod:

If tried it but felt a huge loss in power mostly topend

Do LRP turbo plugs fit Sirio turbo heads for the .21 size motors?

LRP Turbo = Picco Turbo = Sirio turbo?

The sirio plugs are probably the least expensive glow plugs available. Stock up on them when you can find them.

Also, I just ran my second race on my XXX. It is still breaking in so I am periodically still having the engine "go rich" on me. Overall I am quite happy with the engine.

Now I have two good choices with the IDM and the Sirio engines.

+1 there was a slight price increase& even with that there still the least expensive plug available

XXX bearing size
 

Anyone got the front and rear bearing sizes for the XXX engine?

Cheers. :sweat:

Try the Novarossi 2630 with the medium header. Works great on my modded Evo 4 STI. Motor is much better off the bottom and still has plenty of top-end just keep an eye on run time cause it does like to burn some extra fuel.

Regards,
Speyederjedi

its the same bearing as in the evo 4

XXX bearings sizes
 

Got it. Thanks. :nod:

Here are the dimensions for reference if anyone needs it:

Front : 7 X 18 X 5 (mm)

Rear : 12 X 22 X 5 (mm)

Hi guys!
any feedback for the xxx?
does any one when the sti version will be available?

XXX=good. I have three races on mine now and it seems to finally be broken in although it still locks up on the box every once in a while.