EDM rallycross mad tyte rad mods FTW!

Dave

 

You got any pics of the plumbing?

 

Not really, the four pics I posted (2 in this thread, 2 in rear mounted radiator thread) were the best I could find. I've heard some guys run the piping through the frame rails, but since I hillclimb the car on some rough roads, a sharp rock could crimp a frame rail enough to where it'll cause flow restrictions, and there'd be no easy fix. I've heard that some offroad (jeep type stuff) guys will actually run coolant through their roll cages as a trick way to minimize the exposed tubing.

I'm ordering up a bunch of -16AN lines tonight and plan to run the lines under the the heater core and shifter all the way back to the rear seat area. I'm undecided on what radiator to use for now (cross flow or dual core), so I'm not exactly sure how I'll end up routing the lines.

I'm also unsure about the need for an aux. water pump. Verdier's drift subie didn't need one, and I'd love to do without it (less complexity...i.e. fewer parts to break), but realize I probably won't know how the setup fares on an Evo till I give it a shot.

Dave

 

Curious to see if the subi's just come with a bigger water pump, i'd have one anyway regardless for redundancy if anything. Like have two nuts

 

Rear mounted Radiator would be almost ideal, given the quantity of air you 'should' be able to get in there. I tried tofind some of the pics I thought I had but I couldnt, but the pics I saw here and on the rear mounted radiator thread were better anyways.

It will give you an edge in cooling, that's for sure. A problem at PP I hear.

 

For reference, my car in 2008 at ~300whp was just fine with a 2" Koyo at PPIHC. Last year at 500whp the car withstood a track day at PMI with temps from 98-103 and didn't overheat at all on the CBRD 1" drag racing radiator. Hillclimbs in July and August were another matter. Temps in the 80s and racing at high elevation just cause alot of heat.

Dave

 

We'll be lucky to have 300hp at the wheels!

 

I guess I should modify that slightly. We were at 300whp "corrected" when we got tuned before the event. With just a stock motor and normal bolt ons (intake, IC & piping, & exhaust) running E85 (or any race fuel of your choice), the Evo should be able to make those numbers all day long. Just before PPIHC in 2008, we swapped to a FP White turbo and made as high as 390whp corrected at ~28psi. For the race that year we turned the boost down to 22psi since to have a shot at finishing first, first you must finish.

Dave

 

Aint that the truth!!

 

The PWR rally radiator in my Evo was recommended by Millen's engineer. The core is 2.25" thick and has just enough clearance from the turbo. Venting air from the motor bay would be my direction.

 

Hey Dave! Is the radiator lighter by chance? Can it still run the stock fans? or any fans?

 

Thinking back on it, the Koyo 2" radiator was barely enough. At one of our 5 mile hillclimbs later in 2008, we were able to get the car hot running ~25psi. For rally or road race use, a radiator like that works just fine. PPIHC is just a different beast. You're straining the turbo harder b/c the air is so thin, and with the thin air, it lowers the efficiency of the radiator and intercooler. Then, add the fact that you're racing up 10% grade roads, which means even more strain and lower speeds...its really the perfect **** storm of anti-cooling.

BTW, what turbo are you running? At 2.25" thick, I don't think a 35R is going to fit. The other downside with such a large core is that you end up with a pusher fan in front of the radiator, which can hamper flow at higher speeds. That is how I had the car setup in 2008.

From what I've read, if properly designed you can go smaller, but I'm actually likely to go with a larger radiator to make sure I have extra capacity. The reasoning for the smaller cooler is that you've got the lines transferring heat, and the radiator isn't picking up any radiant heat from the engine/turbo.

Stock core is approximately 28x14. Most aftermarket radiators are a 2" core. I'm currently looking at custom ones, but they're turning out to be very expensive. I'm almost thinking I could pick an 'off the shelf' option and have the AN-16 bungs welded on. I figure if it's enough to keep the car cool this year...we can add a bigger turbo for 2011.

I plan to use 2 electric fans and custom shrouding, but first I need to figure out where I want to expel the air. The vertical edge of the trunk can be an area of high pressure, so that may not be the best solution.

Dave

 

How about injecting/using some DEI cooling thing? But not sure if it will last 5 miles ... lol

 

I have used water/alcohol sprayers on the coolers in the past, but they don't do enough on their own. I saw somewhere that the PP Fiestas were using nitrous spray to cool their radiators down, but those aren't legal in any class but Unlimited.

I'm running E85 for fuel, so I don't think there's much to be gained by injecting water or alcohol into the intake tract...plus, that stuff changes the tune, and adds "more parts to break/run out." For the Rally America RallyCross series, they have forbidden water sprayers, so we need to design the system to be able to cope with that too.

Dave

 

I have no information about the weight difference between the rally PWR and stock. Initially both fans were used, now not required for high speed circuit racing. . I run a stock turbo for the clearance point. You can gain more air when you remove the bumper support and relocate the power steering tubing. Could the intercooler spray be improved with fluid type and amount. Relocate larger reservoir to trunk? Double the amount with 2 pumps and 4 nozzles?