Here they are.. Purchased one off ebay for $38 plus shippinig and bought the other one from a friend doing an SR20DET silva conversion. They have 18 cooling channels and stock ICs have 13. Thats about 40% more cooling capability and airflow over stock units. They are built using the same exact air channels and fin design as stock ICs, but they use aluminum end tanks with bolt flanges; no pipe sticking out of them which makes it nice for building your own piping. I used 2" mandrel bent pieces and sectioned them to make the pipes fit everything. I hand made the flanges (from 1/4" mild steel) with a cutting torch, drill, die grinder, and belt sander to smooth the flange. A few pieces of 1"X1/8" aluminum strip was used to mount the IC to the headlight bucket.
 
Notable performance increase by the butt dyno - she doesn't lay down as much at higher RPM when the stock ICs were heatsoaked. Base boost pressure went up 2psi as well. I'm able to run a couple more degrees of timing advance without ping which also adds a few more ponies. My only complaint is that I can't fit the sidemarker light assemblies because the IC is in the way. I didn't take that into account when I built the piping and mounted them. :-( I'll be revisiting this again soon when I get more mandrel pipe in hand and making the sidemarkers fit - there is room. Once that's done I'll be forming some fiberglass ducting to route air from the fascia gills into the face of the IC. Here is my previous dyno chart (red is pump fuel 18psi, blue is race fuel, 24psi) using Z1's stage2 turbos and stock intercoolers.
[ http://z1motorsports.com/Products/Powerplant%20Performance/Turbos/Turbos.asp ] 
You can see that at 24psi on race fuel (blue lines), the power and torque peak out at ~5200RPM but fall sharply from there. At this RPM and power level, the airflow demand is exceeding the ability of the stock intercooler.. This is also apparent in the fact that with these larger ICs I do feel the car continue pulling past 5500RPM whereas before it was laying down up there. I'm working on getting my water injection setup together and I'll be visiting the dyno again. Should be able to see how much difference these ICs make over stock and also be able to see how much water injection actually helps. I'm under the impression that these intercoolers are a surpus item. It would make more sense that people importing front Silvia clips would likely buy a FMIC to put in during the swap. I would imagine they should be relatively easy to get ahold of for a good price considering I got a pair for less than $100. The parts and labor to build the components to make these fit is relatively inexpensive too - I'd imagine a kit could be put together for those who wanted to use these ICs.
[ ashleypowers.com ]
[ agpowers@bellsouth.net ] [ Zemulator Information Sheet ] [ Z1 Motorsports Website ]
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Silvia Intercoolers installed. >> - 
01:01:31 11/30/03
