From memory I believe the CT20B's offered on the ST205 WRC had steel wheels and any rebuilt one will have it also. So it would be safe to push 18 psi on those without hurting it. As mentioned I wouldnt suggest doing so on one that has a ceramic wheel. The turbo that came with my half cut showed evidence that the ceramic wheel was being pushed passed its limit and it was not pretty to say the least. 

If you want a stronger block just use the 5S one. 

Deco
 
From memory I believe the CT20B's offered on the ST205 WRC had steel wheels and any rebuilt one will have it also. So it would be safe to push 18 psi on those without hurting it. As mentioned I wouldnt suggest doing so on one that has a ceramic wheel. The turbo that came with my half cut showed evidence that the ceramic wheel was being pushed passed its limit and it was not pretty to say the least. 

Actually you're correct. Steel wheels were used but since the ceramic can take upto 18psi without too many complaints & the turbo isn't efficient past that, I see limited advantage to running an ST205 turbo.
 
As Dasic said, 5S block will is proven to get the job done. I haven't even heard of a single 5SGTE cracking so far & the Americans have been pushing serious numbers.

MR2QIK
Don't believe Darton make 3S sleeves. If they do, good stuff. Darton revolutionised the Honda scene with those sleeves & crate blocks.

Yeah Darton do sleeves for the 3S, they are quiet expensive though, around 1k a set plus you have all the install costs ontop of that. There are other sleeves you can get but the only one I've had race engine shops recommend have been Darton. Other brands of sleeves are much, much cheaper however but it would be a gamble to see if they are up to the task.

^Ouch.....In that case, better off with a mildly bored 3S or a 5S block considering that price. My "cheaper" sleeves cracked.

I have seen a few sites in the US and UK advertising Darton dry sleeves for the 3S block so I hope that I will be able to get some when the time comes. With running a 5S block how much work is involved in fitting the piston cooler jets and preparing the block?
 
I don't think I would want to try pushing the CT20B past 18psi anyway as any increases I do on the stock engine I would like to remain within safe limits for the health of the engine until such time as I am ready to do a full build.
 
Any recommendations on good electronic boost controllers?

Here is a good ebay ad/article on Darton Sleeves. They give them some pretty big endorsements especially coming from a engine builder.
 
http://www.ebay.co.uk/itm...-sleeved-/251354538781

With the 5S block, I didn't bother with oil squirters. 3S squirters don't fit & you'd have to retrofit another type, which leaves room for error. It'd take a serious application for me to have bothered with oil squirters (like an endurance car). As far as block preparation, you need to drill/elongate the coolant passages to marry up with head (for 3rd Gen head), and you'd also need to drill to fit the axle carrier. Oil cooler is also a consideration, but personally I eliminated the factory oil cooler & run my aftermarket oil cooler & filter relocation kit. You can read a more detailed account on my build thread.
 
As for the EBC, I still use my trusted HKS EVC IV which I purchased new over a decade ago  Does the job perfectly. Most of current range of EBC's (Jap or local) do the job IMO. Find a bargain & run with that. Blitz SBC comes to mind as good value.
 
You just reminded me (totally forgot), I'm pretty sure I bought a spare EBC when I was in Japan (was a bargain & Option1)......lol

I have been having a read through your build thread and getting lots of good ideas
 
It does sound as though there is a bit of work in getting the 5S set up for this aplication and in some ways I am liking the idea of sticking with my gen 3 and going for the darton sleeves they may be pricy but possibly the cost of installing sleeves in the gen 3 block may be comparative to setting up a 5s anyway.
 
I shall have a look into the blitz and see what good value EBC's are around. Thanks
 
So even though your running a haltech your still running a EBC? I thought the haltech would have been capable of boost control on its own?

Don't forget to plug the oil feed for the balance shafts on the 5s block unless you get a celica one.