Mazda Mx5 Miata Eaton MP62 / TVS R900 Hotside Supercharger Dual Throttle Body

[@LukiOppold]

is this a kit for the 1.6l engine?

[@leonardjutoy]

Is this all custom built? I’d love to know where you got the parts or who did it as I’d like to add a TVS 900 on the hot side but I can’t seem to find a kit. Also where did you get that heat shield for the intake?

[@boughtamiata]

I was the Guinea pig for Tom at FastForwardSuperchargers. He now has the specs no problem. Ping him directly. Warning, it's not cheap. The TVS900 turns 10% less air per revolution than the MP62, but is way more efficient, and supports higher pressure ratios when you compare maps. I'd only do this if you felt a burning need to get one or yours is seized. You're spending a couple grand just for a few extra rwhp and torque. I didn't dyno, but the change was noticeable. I went in feeling skeptical and foolish I spent the money for essentially a wash. Really, the end result was the gauge reads 0.5-1 less psi, but feels like you upped it 2psi. If you don't have a hotside at all, he sells enough parts to get you 85% there. The fiberglass intake is from RacingBeat. The K&N filter is RU-5111, not what is normally sold with their own, Miata intake kits. This is the absolute largest that would fit to minimize restrictions.

[@leonardjutoy]

@@boughtamiata You are a legend - Thank you. Really nice set up you have there with your Miata! Must be a hoot to drive!

[@Itsmejanstand]

Where does your bypass valve hose route to? Mine is routed to the sc outlet manifold. I only have one tb at the charger and an intercooler that I recently added. Should I change my bypass hose routing?

[@boughtamiata]

The bypass must be routed to any port that has a vacuum signal. It has to be strong enough to open the bypass. [Edit] On a single TB setup in the charger, that is usually on the SC just cause it's a little cleaner install, but intake manifold is fine too. On any setup that has a TB on the intake manifold, it has to be behind that one. If you put it before either TB, it'll never read vacuum properly. During vacuum, the bypass valve opens a baby butterfly on the SC inlet. At idle, for example, this allows some air flow around the rotors, rather than through them. The engine doesn't have to work as hard to suck in air, improving MPG. Also, positive pressure increases temps. Having a broken bypass will produce boost full time and can cause the rotors to seize in the case.

[@boughtamiata]

Here's an example when the bypass remains closed, when the car is at idle, always ensure vacuum opens it up, it's about 90* from rest when the car is off. Older JRSC M45s had bypass arms that's break and cause a similar issue. kzbin.info/www/bejne/e6qWkHWFYtaenJo

[@Itsmejanstand]

@@boughtamiata thanks for the explanation. So in the video is that a tvs900 hotside? I ask because my tvs900 just shipped from Tom yesterday and your setup is inspiring. I want to copy your setup.

[@boughtamiata]

@@Itsmejanstand yes, you can tell a newer generation Eaton by the pulley. The newer builds use four M4 hexcap heads. The older MP and M series used a single, large bolt with a key way, almost like the Miata/Mx5 crankbolt.

[@Itsmejanstand]

@@boughtamiata yes now I see that the nose is different. Very interesting learning about this charger. If I can ask are you running a stock crank pulley? What kind of power do you see with the tvs? I'm thinking about going larger crank pulley buy my plans are to only get around 225hp from a stock bp4w

[@dannym7759]

Which intake box is that? Would be a fantastic addition to my Moss MP62 set up.

[@boughtamiata]

It's the Racing Beat Fiberglass Cold Air Intake Shield. It's expensive for what it is, but light and seals much better than most of the aluminum kits. If using a Moss kit, you may need to buy a few couplers to reposition the air filter.

[@dannym7759]

@@boughtamiata Thank you. I tried looking it up on their site but no luck. Maybe discontinued? Do you by chance have a link?

[@boughtamiata]

Sure, here you go: www.racingbeat.com/Miata-1990-2005/Intake-Kits-Air-Filters/56499.html