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Garrett exhaust housing cracked

The rusty one you posted photos of looks to be dimensionally the same as the Lotus housing you were asking about. 110mm bolt circle, and wastegate arm clocked differently vs. your stock turbo.

John V has the most experience of any of us here with these ancient Cosworth / T3 turbos, so I'll defer to him to answer questions about implementation or performance preference of one housing vs. another.
 
With the B204FT exhaust manifold you gotta be careful about clearances against stiff like the block, intake hose, heater pipe, oil return, etc. Once you start changing turbine housings the wastegate setup may end up being too close to these components.
 
Sure. I am not willing to try anything untested. But as far as I understand the .63 is the one that JW240 is using in his setup.

I have only driven various cars with the .48 housing..
YBG 4x4 Cossie
2,3 8v Volvo--several
2,3 8v Ford Lima in Us Sierra

And reports from a number of others with B21T, Mitsubishi 4G63 Galant, USDM Misterbitchi Eclipse with 4G63, Volvo 2300 16v

All report a motor that pulls HARD from 2200-2300 rpm and if the motor has the ECU for it, revs past 7000 happily...

The .63 turbine housing in this design was OEM on first 2500 Escort Cosworths for use in Group A rally....which mandated the turbo Ford intended to use on the rally cars in International competition must be on the base homologation cars...so they used TB3403 with the .63 exhaust housing....
But bear in mind that that was so its there when car is in Group A trim...which meant aggressive anti-lag giving just short of 1 bar boost at idle (and idle was around 1400 rpm) and a VERY close ratio 6 speed versnellingsbak so they weren't worry about the car falling off boost on gearchanges because the rpm didn't drop more than 800-1000 rpm, and anti-lag...

The base model "large turbo" Escorts were the slowest stock Cossies because big A/R lag..

I'm guessing but I'll bet you don't have plans for a very close ratio box or aggressive anti-lag. If my guess is right, I would suggest the .48 housing..

And that's assuming as well that this is for a road car, not a track car.
 
I am using the sierra cosworth .48 housing. I think it is from the 2wd cosworth car. Bought it on ebay UK. It is on a B21FT that has a 405 head with flow work, v15 turbo cam and 90+ exhaust manifold. Kjet and some other stuff. If it was on an engine with the 8.7 compression instead of the 7.5 mine has. it would even more fun. I'm going to use one on my next engine.
I use a flared 3" pipe directly out of the turbine housing.
I've seen T3 type wastegate actuators with an offset arm. That may help with the actuator location change. Mine is at an angle so it isn't as smooth operating as I would like.
https://www.ebay.com/itm/Garrett-In...h=item3d313c9b49:g:XTwAAOSwf4pZytgy:rk:4:pf:0

Another affordable setup is the five bolt T3 .63 exhaust housing as used on a 240 turbo. That combined with the ATP ultimate gate has worked for people.
 
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Ok, found a .48 cosworth housing...pictures below. Just need a confirmation from one of you guys that it is the right one ;-)

<a href="https://imgur.com/fMvympx"><img src="https://i.imgur.com/fMvympxl.jpg" title="source: imgur.com" /></a>

<a href="https://imgur.com/oFEB2gj"><img src="https://i.imgur.com/oFEB2gjl.jpg" title="source: imgur.com" /></a>

<a href="https://imgur.com/eGc8uH1"><img src="https://i.imgur.com/eGc8uH1l.jpg" title="source: imgur.com" /></a>

<a href="https://imgur.com/GtACIaJ"><img src="https://i.imgur.com/GtACIaJl.jpg" title="source: imgur.com" /></a>
 
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This turbo story really takes time...
The housing above showed some significant signs of usage after cleaning...so after further considerations, I decided to buy a brand new one :roll: that one should be delivered within a week. Surprisingly it is still available.

Turbotechnics UK
T3 10190-600 (Cosworth)
MADE TO ORDER ? 7 DAY LEAD TIME - ?330

Pics of the used Cosworth housing after cleanup

<a href="https://imgur.com/tvJqP7U"><img src="https://i.imgur.com/tvJqP7Ul.jpg" title="source: imgur.com" /></a>

<a href="https://imgur.com/kPAcNXK"><img src="https://i.imgur.com/kPAcNXKl.jpg" title="source: imgur.com" /></a>

<a href="https://imgur.com/TRW07cD"><img src="https://i.imgur.com/TRW07cDl.jpg" title="source: imgur.com" /></a>

<a href="https://imgur.com/gtVWV81"><img src="https://i.imgur.com/gtVWV81l.jpg" title="source: imgur.com" /></a>
 
I had less cracking on mine and it's been fine. But the new one is nice to work with. You are gonna make the cracks. lol.

Did you get the .48 or .63 version?
 
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Well, I want to limit a chance that some small piece of the housing gets loose and possibly damages the turbine wheel. In other words, to do it and forget it.
Based on the remarks from JohnV and as I want quicker spool rather than higher top end power, I went with the .48 cosworth.
 
My baby is finally back from the shop :)

- fully rebuilt using upgraded parts
- billet compressor wheel
- brand new cosworth exhaust housing!
- modified WG bracket
- plugged CBV (I will have external piston type one)


<a href="https://imgur.com/UirroeB"><img src="https://i.imgur.com/UirroeBl.jpg" title="source: imgur.com" /></a>

<a href="https://imgur.com/xNpn2tK"><img src="https://i.imgur.com/xNpn2tKl.jpg" title="source: imgur.com" /></a>

<a href="https://imgur.com/xNpn2tK"><img src="https://i.imgur.com/xNpn2tKl.jpg" title="source: imgur.com" /></a>

<a href="https://imgur.com/FTRbvmx"><img src="https://i.imgur.com/FTRbvmxl.jpg" title="source: imgur.com" /></a>

<a href="https://imgur.com/zqZsMYQ"><img src="https://i.imgur.com/zqZsMYQl.jpg" title="source: imgur.com" /></a>

<a href="https://imgur.com/io2SVxV"><img src="https://i.imgur.com/io2SVxVl.jpg" title="source: imgur.com" /></a>
 
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