The radiator is now part of the way mounted underneath the cross piece that the hood latch attaches to. I need to make some better brackets to hold the bottom up, but the uppers fit nicely. I had to do a little rerouting of the loom to get it out of the way of the radiator. Mounting the radiator the way I did is only possible because of previous modifications made to make room for the TT 1UZ.
This gives me some extra room between the radiator and the engine. The reason I want extra room there is:
These will be sitting between two 4x8" barrel style water to air intercooler cores, with 2.25" inlets and outlets. Each is said to "support" 290hp.
[EDIT: no they won't. the 1/2" NPT ports were not lined up well enough on the two intercooler cores to connect them with these T pieces, but they will still get used...]
Why two small intercooler cores instead of a roughly equivalent but easier-to-route single 6" round core or similar?
The 4"s fit between the engine and radiator, A 6" doesn't.
Why put them behind the radiator?
A short intake tract with low volume should improve throttle response and keep pressure drop low compared to an FMIC. It's debatable but I'm doing it, so we'll see!
Won't they get heat soaked?
I will be insulating them as well as I can and pumping as much cool fluid through them as I can to minimize this. The pump does 20GPM free-flowing and will be connected with -12AN.
You're doing this for stock twins??
Stock twins, especially, will benefit from lower pressure drop and as cool of an intake charge as possible. It means they don't need to work as hard to produce the same pressure at the valves, and a cooler charge means (correct me if I'm wrong,) more advanced spark timing from the ECU and consequently lower EGTs. Lower EGTs might mean the twins live longer at >9 psi.
If/when they fail I upgrade.
Where will your engine fan go if your intercooler setup is in that space?
I have 1 electric pusher fan that will fit on the front for sure, and other fans could be adapted to push as well. My experience tells me that air flow can be replaced to an extent with greater surface area. I'm willing to try adding additional heat exchangers, or possibly even go back to a hydro fan pump and adapt that to work in a push configuration.
I will be making custom piping from the turbo hotside outlet to the intercoolers and back to the throttle body. The sizing is: 2.25" from the turbo hotside split to dual 2.125", through the intercoolers, back into dual 2.125", merged to 2.75", and finally into the throttle body. This is from stainless 304 pipe using mandrel bends and smooth transitions generally intended for exhausts.
I may just tack the pieces into place and have a more experienced welder do the seems.
Dual 2.125" has approximately the same cross sectional area as a single 3" pipe, so you can think of it as 2.25" to 3" and back to 2.75". Having the larger pipe on either side of the intercooler core will result in slower flow there, but my thinking is that the cores slow down the flow already, and that more gradual changes in speed leading in and out of the cores may help rather than hurt, when compared to the abrupt speed changes that happen in the couplers and endtanks in a usual system.