How many are using Air to Air

[Jer]

I don't know anything about that set-up but you would need to be running your turbo beyond it's efficiency level to require the use of two intercoolers.

You'd have to see that setup. The 2 intercooler shared end tanks, and it basically allowed you to run a decent size intercooler down below, and a decent sized intercooler in front of the radiator.

Too large down below is wasted as there is no airflow, too large of an IC up top and you restrict too much of the airflow to the radiator. I thought the cores were well laid out, but the pipe routing sucks.

As far as your statement goes, that's a broad generalization. Sure a single large core works, but fitment is an issue in the trucks, and the Dequick design wasn't such that it operated like 2 cores, rather 1 core that had modified end tanks. I'd have no qualms about using that core setup on a fast truck (and they have been used on some fast trucks)- the pipes left a lot to be desired, however. Core size/flow/turbo size is all going to be subjective. Supra guys swear by a 4 row Greddy setup that has a HUGE core setup, that you couldn't use in any Syty, unless you threw the radiator out back, or some other crazy setup. Most guys using that core setup on Supras are using 60-77mm turbos, like Syty's have done.

Okay, so it was two IC's that were welded to use one set of end tanks.. makes sense. A lot of the pressure drop can occur in the end tanks so using one set would cut that possible pressure drop out of the equation. I'm not saying it can't be done or isn't a good idea, I'm saying for most people's power goals it's probably not necessary.

 

[Jer]

Just FYI, the dual air to air is on the fastest V6 Sy in the world.

Is it running twin turbos?

 

[MRKING]

1

1

Single BIG turbo , this is his website with pics . http://www.syclone.org/

 

[GregS]

Pressure drop can also be inferred from end tank volume, which that dual a2a has in spades. That thing probably has a rather large pressure drop.

There's another problem with it's endtank design. Since the hot entrance and cold exit are immediately across from one another, the majority of the heat and airflow are cutting straight across the bottom of the lower IC. This overheats those bottom 4-5 rows, and under-utilizes the upper rows of the lower IC. I doubt if the upper core sees much temperature change at all. Ideally the airflow would be directed through the IC distributing the heat proportionaly. Unfortunitely, using baffles and air dams inside the core tends to lower the flow rates, killing HP (although not TQ).

I agree that truck probably only needs the lower a2a core. It obviously has IAT low enough to make decent power, but it is also using water injection to lower combustion temps. The combo works, and I'd venture to guess it would work a bit better without that top core. Although at that output level, the difference may not be noticeble. What's he making, like ~900hp?

Check out Maximum Boost by Corky Bell, Forced Induction Tuning by A. Bell, etc. available at bn.com. Good books about "ideal" setups and "real world" solutions. I've put them to good use throughout my years of fab-ing, saving countless years of experience.