Flyin Miata coolant reroute
Flyin Miata coolant reroute
What does it fit?
What does it fit?
1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1999, 2000, 2001, 2002, 2003, 2004, 2004 MSM, 2005, 2005 MSM
The best coolant reroute on the market - and the only one that is truly compatible with a turbocharger.
First - why do you want a coolant reroute? Because when Mazda went to put the B-series engine in the Miata, they decided to put the thermostat on the front of the engine for packaging reasons. This means that a large portion of the coolant never goes through the back half of the engine, leading to poor overall heat transfer and problems with the #4 cylinder running hot. Moving the thermostat to the back of the engine where it's supposed to be solves these problems.
We've been selling reroutes for years, and they've been gradually getting better. This one has been designed and tested for maximum flow. We went through multiple designs testing the flow to make sure this is actually true. Our flow area is 8% better than stock, 11% better than the first reroute we sold and 5% better than our previous offering. We even tested flow through the heater so you'll stay warm.
It puts the thermostat right into the head where it belongs so it reacts quickly. It's completely compatible with EGR pipes - not "it works if you hit it with a hammer" compatible, but done right. It's fully electrically conductive so your temperature sensors read properly, and it has a spot for an aftermarket sensor. The reroute housing is a single piece to avoid leaks. Even the thermostat is an off-the-shelf 180°F unit so you can run a different temperature if you'd like. There's a bleeder screw on the top of the housing so you're sure you don't have air bubbles. So it's the best reroute you can buy already.
But the big difference is the turbocharger. We worked with the engineering department at Colorado Mesa University to map out all the cooling factors of the Miata engine, and discovered that a water-cooled turbocharger will increase the temperature of the coolant flowing through it by as much as the rest of the engine put together. To make things worse, this very hot coolant is mixed right back into the engine coolant, with no chance to cool down at all. Obviously, we decided to address this. First, we dropped the amount of flow into the turbo - they're cooled by the engine oil during operation, they really only need the water cooling when the engine is off and they use thermal siphoning to get it. The big difference is the plumbing, though - the water coming from the turbo is now plumbed back into the water heading into the radiator so that it's cooled before going back into the engine.
If you are going to be using this reroute with a turbo, our turbo connection kit includes new multi-layer silicone lines with heatshielding, anchors and all fittings. If you have an FM turbo kit, choose the "Garrett turbo" option. If you have a different aftermarket turbo kit that uses 5/16" water lines, choose the "Garrett turbo" option - bear in mind that the farther your turbo location is from ours, the greater the likelihood that the included lines won't work (although we do leave them pretty long). If you have a stock MSM turbo on an MSM engine, choose the "MSM turbo" option. If you have a Garrett turbo on an MSM engine, choose "Garrett turbo" and also search for 09-61011 and that kit to your cart. If you have an MSM turbo on a not-MSM engine, choose the "MSM turbo" option. Our turbo hard line kit won't work with our reroute.
If you're installing this and our turbo kit at the same time an MSM engine, you'll need an extra kit (search for 09-61011). If you're installing this reroute kit on a pre-existing turbo install, you won't need that kit.
If you already have banjo fittings (hose barbs) on your turbo, choose "no banjo fittings" since you don't need more. Our hard lines don't use banjo fittings, so you'll need them if you're moving from hard lines to this kit.
Built in the US. Includes everything required for installation. Compatible with stock and FM turbo EGR piping. Compatible with both upright and crossflow radiators. Compatible with our Big Spark kit. Includes all required hoses/lines, custom thermostat gasket, and fittings as well as plates to block off either the thermostat or the thermostat neck (at the head) and plugs for unused fittings.
There's a bunch of noise about reroutes and 01-05 headgaskets, thanks to that headgasket having different size passages to manage the coolant flow better with the stock routing. Are they safe? Do you have to use an earlier headgasket? In short, you'll be fine with the stock headgasket - we've had this reroute on our development '02 through thousands of street and track miles with no issues, and we're not the only ones. If you have to swap the headgasket for other reasons, you might as well use the earlier headgasket, but it's not a requirement.
If you're planning to remove the thermostat / water neck altogether (not required, although we include a block-off plate for it), be sure to add our timing cover hole plate kit to keep your timing belt safe. Refer to the instructions for more info on deleting the thermostat neck.